Email: [email protected]
Phone: +91 93135 43530
Address: 133/1 Ground, Mansuri Block, Opp. Dudheshwar Water Tank, Ahmedabad-380004, Gujarat, India
SS304 Eye Bolt Supplier India — Forged DIN 580 M6–M36 | WLL Table | KELOR Ahmedabad
Krishna Industries (KELOR), Ahmedabad, supplies SS304 Forged Eye Bolts — DIN 580 / IS 2585 — M6 to M36 — plain shank and shoulder (collared) type — WLL stamped on shank — self-colour finish (inherent corrosion resistance, no coating required) — food processing, pharmaceutical GMP, chemical, marine-adjacent, outdoor industrial lifting — MOQ 10 Nos — GST invoice HSN 73181590 — Pan India dispatch from Ahmedabad.
MTC available on request. WhatsApp thread size, type, and quantity for pricing within 2 hours during business hours.
⚠ Eye Bolts Are Safety-Critical Lifting Equipment — Read Before Ordering
- Always specify FORGED eye bolts for lifting applications — bent wire or welded eye bolts are NOT rated for lifting. The eye can open under load causing dropped-load injury.
- Load de-rating at angle is severe: At 45 degrees, the WLL drops to only 30% of straight-line rated load. At 46 degrees and above — do not use.
- Use shoulder (collared) type for angled loading — plain shank eye bolt can ONLY take straight-line (axial) pull. Shoulder type handles angled pull up to 45 degrees.
- Full thread engagement is mandatory: Thread engagement must equal at least 1.5x the bolt diameter. Partial engagement is a common cause of eye bolt pull-out failure.
- Always verify WLL from the load table below before use — never assume load capacity from visual size alone.
⚡ Quick Reference
SupplierKrishna Industries (KELOR) — Ahmedabad, Gujarat
ProductSS304 Forged Eye Bolt — DIN 580 / IS 2585
MaterialSS304 (AISI 304 / A2-70) — 18% Cr, 8% Ni
Size RangeM6 to M36 (standard) — M42 to M100 on request
TypePlain shank (standard) / Shoulder collared (angled load)
FinishSelf-colour (no coating needed — inherent SS304 corrosion resistance)
WLLMarked on shank per DIN 580 — proof load 2x WLL, breaking load 4x WLL min
MOQ10 Nos per size per type
📜 On This Page
- What Is an SS304 Eye Bolt?
- Plain Shank vs Shoulder Collared Type
- Why SS304 Over Carbon Steel for Eye Bolts
- SS304 Chemical Composition for Eye Bolts
- Technical Specifications — DIN 580 SS304
- DIN 580 WLL Table — M6 to M36
- Angular Load Reduction — Critical Safety
- Dimensional Specifications — M6 to M36
- Hot Forged vs Bent Wire vs Welded — Safety Comparison
- Installation Safety Requirements
- Inspection and Discard Criteria
- SS304 Eye Bolt Applications by Industry
- SS304 vs SS316 — When to Upgrade
- SS304 Fastener Market Snapshot
- Why Choose KELOR for SS304 Eye Bolts
- Commercial Information
- Frequently Asked Questions
What Is an SS304 Eye Bolt?
An SS304 eye bolt is a threaded fastener with a forged circular loop (eye) at one end and a metric threaded shank at the other, manufactured from AISI 304 stainless steel to DIN 580 dimensional standards. The eye provides an attachment point for lifting slings, shackles, wire ropes, and chains, while the threaded shank secures the eye bolt into tapped holes in machinery, equipment, dies, structural members, and lifting frames. SS304 is the most widely specified stainless steel grade for eye bolts in India because it provides inherent corrosion resistance without requiring any protective coating, eliminates the risk of zinc flaking that occurs on zinc-plated carbon steel eye bolts, and complies with food safety and pharmaceutical GMP requirements for clean lifting hardware.
The SS304 eye bolt is manufactured by hot forging from a single continuous piece of SS304 bar stock. The forging process aligns the grain structure of the stainless steel continuously through the eye and shank, ensuring that the full tensile strength of the material is available throughout the eye under load. This is fundamentally different from bent wire eye bolts (where the eye is formed by bending a wire rod with no securing mechanism) and welded eye bolts (where the eye ring is attached to the shank by a weld joint that creates a stress concentration point). Only forged eye bolts are rated for lifting applications. KELOR supplies exclusively hot forged SS304 eye bolts with WLL (Working Load Limit) stamped on every shank, confirming that each eye bolt meets the DIN 580 rated load capacity for its thread size.
KELOR supplies SS304 forged eye bolts from verified Indian manufacturing sources in plain shank and shoulder collared types from M6 to M36, with the complete DIN 580 dimensional range available. Every eye bolt is individually inspected for dimensional accuracy, surface finish, and WLL marking before dispatch from the Ahmedabad warehouse. GST invoices are issued under HSN code 73181590 for all eye bolt dispatches across India.
SS304 Forged Eye Bolt — DIN 580Hot forged from continuous SS304 bar stock. WLL stamped on shank. Self-colour finish with inherent corrosion resistance.
Third-Party NABL-Certified MTCEN 10204 Type 3.1 mill test certificate verified by NABL-accredited independent laboratory. SS304 chemical composition confirmed.
NABL Test Report — Threaded SpecimenIndependent third-party test results for threaded SS304 eye bolt specimen. Tensile strength and proof load values documented.
Plain Shank vs Shoulder Collared Type
Selecting between plain shank and shoulder collared type is the most critical specification decision for any eye bolt application. The wrong choice can result in a dangerous failure if the eye bolt is subjected to loading conditions it was not designed to handle. The following comparison explains the structural differences and application limitations of each type.
Plain Shank Eye Bolt (Standard)
- Straight cylindrical shank — no collar at base of eye
- For straight-line (axial) loading ONLY — pull exactly in line with bolt axis
- Most common type — standard stock item at KELOR
- DIN 580 standard dimensions — M6 to M36
- Lower cost than shoulder type
- ❌ NOT for angled loading — at 45 degrees, WLL drops to only 30%
- Use: Vertical straight lift where load is directly above the eye bolt
Shoulder (Collared) Eye Bolt
- Machined collar (shoulder) at base of shank bears against mounting surface
- Accepts angled loading up to 45 degrees safely
- Collar takes bending moment that would bend a plain shank
- DIN 580 / ISO 3266 standard — M8 to M36
- Higher cost than plain shank — justified when load angle exceeds 5 degrees
- Mandatory for rigging where load direction is not perfectly vertical
- Use: Horizontal lifts, angle lifts, machinery turning, sling rigging
⚠ Selection Rule: When in Doubt, Specify Shoulder Type
If there is any uncertainty about whether the load will be applied at an angle, always specify the shoulder collared type. The additional cost of the shoulder type is negligible compared to the safety risk of using a plain shank eye bolt in an angled loading application. Many industrial lifting accidents in India occur because a plain shank eye bolt was used where the load was applied at 20 to 45 degrees — a condition where the WLL is already reduced by 35% to 70%. KELOR recommends shoulder type for all applications except those where the lift is confirmed to be perfectly vertical and straight-line.
Why SS304 Over Carbon Steel for Eye Bolts
SS304 stainless steel eye bolts provide a distinct set of advantages over carbon steel eye bolts that justify the higher initial cost in most industrial applications. While carbon steel eye bolts with zinc plating or hot dip galvanising are the economical choice for dry indoor environments, SS304 becomes the preferred and often mandatory specification for applications involving moisture, chemicals, food contact, or cleanroom environments. The following comparison covers the key parameters that industrial buyers should evaluate when selecting the eye bolt material for their specific application.
| Parameter | SS304 Eye Bolt (This Page) | Carbon Steel Zinc Plated | Carbon Steel HDG |
|---|---|---|---|
| Corrosion Resistance | Excellent — inherent, no coating needed | Moderate — zinc coating degrades in wet environments | Good — 45–85 micron zinc layer |
| Food / Pharma Compliance | Compliant — FDA 21 CFR Part 174 | Non-compliant — zinc contamination risk | Non-compliant — zinc contamination risk |
| Coating Flaking Risk | None — self-colour, no coating | Yes — zinc flakes under load or impact | Minimal — thick HDG layer is more durable |
| Outdoor Service Life | 15–25 years in mild environments | 3–5 years before red rust | 10–15 years |
| Chemical Resistance | Good — mild acids, alkalis, solvents | Poor — coating attacked by chemicals | Poor –Moderate — HDG attacked by acids |
| Cleaning / Sanitisation | Easy — caustic and acid CIP safe | Not recommended — cleaning damages zinc | Limited — strong cleaners attack HDG |
| Aesthetic Appearance | Bright, metallic finish — no rust staining | Bright zinc dulls to grey, then rust stains | Grey metallic, some rust staining long-term |
| Relative Cost | 2–3x carbon steel zinc plated | Lowest — baseline cost | 1.3–1.5x zinc plated |
| Recommended Application | Food, pharma, chemical, outdoor, wet, marine-adjacent | Dry indoor machinery lifting only | Outdoor construction, structural, long-term outdoor |
✅ SS304 — The Standard for Clean Environment Lifting
In food processing plants, pharmaceutical manufacturing facilities, and GMP-compliant environments, SS304 is the mandatory material specification for lifting eye bolts. Zinc-plated and HDG carbon steel eye bolts shed zinc particles and iron corrosion products that contaminate food products, pharmaceutical batches, and cleanroom environments. SS304 provides a smooth, non-shedding, easily sanitised surface that maintains its appearance and integrity through repeated cleaning cycles. For these environments, the higher initial cost of SS304 is insignificant compared to the cost of a product contamination event or regulatory non-compliance finding. KELOR supplies SS304 DIN 580 eye bolts specifically for food and pharmaceutical lifting applications.
SS304 Chemical Composition for Eye Bolts
The corrosion resistance and mechanical properties of SS304 eye bolts are determined by the chemical composition of the stainless steel used in the forging process. The following table defines the composition requirements that KELOR specifies for SS304 eye bolt material, ensuring adequate corrosion resistance and tensile strength for rated lifting applications.
| Element | AISI 304 / A2 Requirement | Role in Eye Bolt Performance |
|---|---|---|
| Chromium (Cr) | 18.0 – 20.0% | Forms passive Cr₂O₃ oxide layer — primary corrosion resistance mechanism |
| Nickel (Ni) | 8.0 – 10.5% | Stabilises austenitic structure — provides ductility and toughness in the forged eye |
| Manganese (Mn) | Maximum 2.0% | Deoxidiser during steelmaking — strengthens the forged structure |
| Carbon (C) | Maximum 0.08% | Low carbon for good weldability if post-processing is needed — minimises carbide precipitation |
| Silicon (Si) | Maximum 1.0% | Deoxidiser — improves fluidity during hot forging |
| Phosphorus (P) | Maximum 0.045% | Impurity — kept low to maintain ductility |
| Sulphur (S) | Maximum 0.030% | Impurity — kept low to maintain forgeability and corrosion resistance |
| Tensile Strength | Minimum 515 MPa | Exceeds Grade 4.6 carbon steel (400 MPa) — SS304 WLL equals CS WLL for same DIN 580 size |
| Yield Strength | Minimum 205 MPa | Minimum yield stress before permanent deformation |
Technical Specifications — DIN 580 SS304 Eye Bolt
| Parameter | Specification |
|---|---|
| Standard | DIN 580 (metric) / IS 2585 / ISO 3266 |
| Type | Plain shank (standard) / Shoulder collared (for angled loading) |
| Material | SS304 (AISI 304 / A2-70) — hot forged |
| Manufacturing | Hot forged from single SS304 bar — eye and shank one continuous piece — no weld joint in eye |
| Thread Type | Metric coarse (M6 to M36) — BSW / UNC on request |
| Size Range | M6 to M36 (standard) — M42 to M100 on request |
| Finish | Self-colour (passivated) — no coating required |
| WLL Marking | WLL stamped on shank with thread size — mandatory per IS safety requirements |
| Proof Load | 2x WLL minimum |
| Breaking Load | 4x WLL minimum |
| MOQ | 10 Nos per size per type |
| HSN Code | 73181590 |
DIN 580 Working Load Limit (WLL) Table — SS304 M6 to M36
The Working Load Limit (WLL) is the maximum load that may be safely applied to the SS304 eye bolt in straight-line (axial) lifting. WLL is different from proof load (2x WLL — factory test) and breaking load (4x WLL minimum — ultimate failure). Always size to WLL for safe lifting. The WLL values below apply to SS304 forged eye bolts and are equivalent to carbon steel values for the same DIN 580 thread size because SS304 tensile strength (515 MPa minimum) exceeds the Grade 4.6 carbon steel requirement (400 MPa).
| Thread Size | Shank Dia (mm) | Eye Inner Dia (mm) | Eye Outer Dia (mm) | WLL Straight Pull (kg) | WLL at 15° (kg) | WLL at 30° (kg) | WLL at 45° (kg) |
|---|---|---|---|---|---|---|---|
| M6 | 6 | 12 | 20 | 90 | 72 | 58 | 27 |
| M8 | 8 | 16 | 26 | 200 | 160 | 130 | 60 |
| M10 | 10 | 20 | 32 | 320 | 256 | 208 | 96 |
| M12 | 12 | 22 | 36 | 500 | 400 | 325 | 150 |
| M16 | 16 | 28 | 46 | 900 | 720 | 585 | 270 |
| M20 | 20 | 36 | 58 | 1,400 | 1,120 | 910 | 420 |
| M24 | 24 | 42 | 68 | 2,000 | 1,600 | 1,300 | 600 |
| M30 | 30 | 53 | 85 | 3,200 | 2,560 | 2,080 | 960 |
| M36 | 36 | 63 | 100 | 4,500 | 3,600 | 2,925 | 1,350 |
WLL values per DIN 580 for forged SS304. Angular de-rating: 15 degrees = 80% WLL, 30 degrees = 65% WLL, 45 degrees = 30% WLL. Above 45 degrees — do not use. WLL for SS304 equals carbon steel WLL for same DIN 580 size. Always use shoulder collared type for any angle greater than 5 degrees.
Angular Load Reduction — Critical Safety Information
⚠ Most Common Eye Bolt Accident in Indian Industrial Lifting
Using a plain shank eye bolt at an angle without reducing the rated load. At 45 degrees, an M20 eye bolt rated 1,400 kg straight-line is rated only 420 kg — a 70% reduction. Loads that appear safe by eye bolt size can be 3 to 4 times above the actual angled WLL, leading to sudden eye bolt failure and dropped-load injury.
| Load Angle from Vertical | % of Straight WLL Remaining | Safety Action Required |
|---|---|---|
| 0 degrees (straight vertical) | 100% | Full WLL — standard sizing applies — plain shank acceptable |
| Up to 5 degrees | 100% | Negligible deviation — plain shank acceptable |
| 6 to 15 degrees | 80% | Derate — use shoulder eye bolt — load must be 80% or less of straight WLL |
| 16 to 30 degrees | 65% | Shoulder type mandatory — load must be 65% or less of straight WLL |
| 31 to 45 degrees | 30% | Shoulder type only — severely derated — load must be 30% or less of straight WLL |
| Above 45 degrees | Do Not Use | DIN 580 eye bolt must not be used above 45 degrees — use swivel hoist ring or shackle |
Dimensional Specifications — SS304 Eye Bolt M6 to M36
| Thread | Shank Dia d (mm) | Eye Inner da (mm) | Eye Outer dk (mm) | Eye Width h (mm) | Thread Length b (mm) | Weight per pc (g) |
|---|---|---|---|---|---|---|
| M6 | 6 | 12 | 20 | 14 | 18 | 18 |
| M8 | 8 | 16 | 26 | 18 | 24 | 35 |
| M10 | 10 | 20 | 32 | 22 | 28 | 60 |
| M12 | 12 | 22 | 36 | 26 | 34 | 90 |
| M16 | 16 | 28 | 46 | 32 | 42 | 185 |
| M20 | 20 | 36 | 58 | 38 | 52 | 320 |
| M24 | 24 | 42 | 68 | 44 | 60 | 520 |
| M30 | 30 | 53 | 85 | 54 | 72 | 980 |
| M36 | 36 | 63 | 100 | 62 | 84 | 1,550 |
Hot Forged vs Bent Wire vs Welded — Safety Comparison
Forged SS304 Eye Bolt (KELOR Supplies)
- Hot forged from one continuous SS304 bar — eye and shank monolithic
- Grain structure aligned continuously through eye — full tensile strength available
- WLL stamped on shank — rated for lifting applications
- No weld joint, no discontinuity, no weak point in the eye
- Meets DIN 580 and IS 2585 dimensional and load requirements
- ✅ Safe for rated lifting — specified for all overhead applications
Bent Wire Eye Bolt (NOT for Lifting)
- Made by bending SS wire rod into eye shape — no securing mechanism at eye joint
- Eye can open under load without warning — sudden dropped load
- No WLL marking — not rated for any load
- Grain structure shows sharp bend with surface cracking potential
- Lowest cost — acceptable only for light-duty tethering and hanging
- ❌ Never use for lifting, overhead rigging, or safety-critical applications
Welded eye bolts (where the eye ring is welded to the shank) fall between forged and bent wire in safety. The weld creates a stress concentration point that is weaker than the parent material. Weld quality varies between batches and between suppliers, making the actual load capacity unpredictable. While welded eye bolts may carry a WLL rating from some suppliers, KELOR supplies only hot forged SS304 eye bolts because the monolithic forged construction provides the most reliable, consistent, and traceable load capacity for safety-critical lifting applications.
Installation Safety Requirements
- Full thread engagement: The threaded shank must be screwed into the base material with full thread engagement — minimum engagement depth equals 1.5 times the bolt diameter (M20 requires minimum 30 mm, M24 requires minimum 36 mm). Partial engagement dramatically reduces pull-out strength and is a leading cause of eye bolt failure during lifting.
- Shoulder type must seat flat: The collar must bear fully and evenly on the mounting surface. If the collar does not contact the surface completely, the bolt is not properly installed and must not be loaded. The collar distributes bending forces from angled loads into the mounting surface rather than concentrating them in the shank.
- Use plain washer with locknut: For through-bolt applications, fit a large flat washer under the nut to distribute load over a larger area. Use a locknut to prevent loosening under vibration. The washer must be SS304 to maintain corrosion compatibility.
- Align the eye with the load plane: Orient the eye so the sling or shackle pulls through the plane of the eye ring — never apply load across the narrow dimension of the eye. Side loading on the eye creates bending stresses that are not accounted for in the WLL rating and can cause premature failure.
- Not for shock loading: Eye bolts rated WLL are for static or slowly applied lifting loads. Do not use for shock loading, drop-testing, or sudden jerking motions. WLL does not cover dynamic impact loading. For dynamic applications, derate the WLL or specify a higher-rated rigging component.
- Inspect before each use: Check every eye bolt for visible deformation, corrosion, cracks, thread damage, or illegible WLL marking before use. Discard any eye bolt with visible deformation of the eye ring — a deformed eye has been overloaded and its WLL cannot be trusted for subsequent lifts.
Inspection and Discard Criteria
| Inspection Point | Accept | Discard Immediately |
|---|---|---|
| Eye ring shape | Round, no visible deformation | Any visible bend, elongation, or distortion of the eye ring |
| Eye-to-shank transition | Smooth, continuous forging radius | Cracks, sharp bends, or visible stress marks at transition |
| Thread condition | Clean, full-depth threads, no galling | Stripped threads, cross-threading, or corrosion damage to threads |
| Surface corrosion | Light surface discolouration (SS304 passive layer) | Pitting corrosion, rust staining, or surface flaking |
| WLL marking | Legible WLL and size stamp on shank | Illegible or missing WLL marking — cannot verify rated load |
| Shoulder collar (if shoulder type) | Flat, even, no deformation | Bent, cracked, or uneven collar surface |
SS304 Eye Bolt Applications by Industry
Food Processing
Lifting mixers, conveyors, stainless steel vessels, oven frames. SS304 eliminates zinc contamination. M12 to M24. FDA compliant.
Pharmaceutical / GMP
Cleanroom equipment positioning, reactor lifting, GMP-compliant rigging. SS304 — CIP-safe surface. M10 to M20.
Chemical Plants
Reactor and vessel lifting in mildly corrosive environments. SS304 withstands most organic chemicals. M12 to M30.
Marine-Adjacent / Coastal
Outdoor equipment in coastal industrial areas with salt spray. SS304 resists atmospheric corrosion. M12 to M24.
Outdoor Industrial
Plant maintenance and MRO store stock for outdoor lifting. SS304 needs no coating renewal. M8 to M24 assortment kits.
Machinery / Equipment
Lifting machine tools, dies, presses, pumps, motors. SS304 for wet or washdown environments. M10 to M24.
Construction / Infrastructure
Precast concrete lifting inserts in coastal zones. SS304 resists corrosion from concrete chemicals. M16 to M30.
Power / Utilities
Transformer positioning, switchgear lifting, outdoor substation equipment. SS304 for long-term outdoor exposure. M16 to M36.
SS304 vs SS316 — When to Upgrade
| Parameter | SS304 (Standard — This Page) | SS316 (Upgrade — Available from KELOR) |
|---|---|---|
| Chromium | 18–20% | 16–18% |
| Nickel | 8–10.5% | 10–14% |
| Molybdenum | None | 2–3% (provides chloride pitting resistance) |
| Pitting Resistance | Adequate for mild chloride (below 200 ppm) | Superior — resists pitting up to 1000 ppm chloride |
| Seawater Immersion | Not recommended — pitting in seawater | Recommended — standard for marine/offshore |
| Food Processing | Standard for most food applications | For high-salt / high-acid food processing |
| Cost Premium over SS304 | Baseline | Approximately 1.5x SS304 cost |
For the majority of industrial applications in India, SS304 provides adequate corrosion resistance at the most economical price point. SS316 should be specified when the application involves seawater immersion, chloride concentrations above 500 ppm, high-acid food processing, or offshore and marine environments. KELOR supplies both SS304 and SS316 forged eye bolts and provides material selection guidance based on the specific environmental conditions of each application.
SS304 Fastener Market Snapshot
18%
Chromium in SS304 — Passive Oxide Layer
515 MPa
Min Tensile Strength SS304
4,500 kg
Max WLL — SS304 M36 Straight Pull
30%
WLL Remaining at 45-Degree Angle
Why Choose KELOR for SS304 Eye Bolts
🔨
Hot Forged — WLL Marked
Every SS304 eye bolt is hot forged from continuous bar stock with WLL stamped on shank. No bent wire. No weld joints in the eye.
🏭
SS304 — Self Colour
Inherent corrosion resistance. No zinc plating to flake. No coating to maintain. Compliant for food and pharma lifting applications.
📋
GST Invoice — HSN 73181590
100% GST invoice. MTC confirming SS304 chemical composition (18% Cr, 8% Ni) available on request.
📦
MOQ 10 Nos
Minimum 10 Nos per size per type. Mixed size assortment kits M8–M24 available as single GST invoice consignment.
🚚
Pan India Dispatch
M6–M24 plain shank: 5–7 working days. M30–M36 and shoulder type: 10–15 working days. From Ahmedabad.
💬
2-Hour Quotation
WhatsApp thread size, type, and quantity. KELOR responds with pricing within 2 hours during business hours.
Need SS304 Eye Bolt Pricing for Your Project or MRO Store?
WhatsApp thread size (M__), type (plain shank / shoulder), and quantity. Quote within 2 hours during business hours.
WhatsApp Now Email: [email protected]Commercial Information
Order and Delivery Details
MOQ
10 pieces per size per type
Standard Stock Sizes
M6 to M24 — plain shank
Stock Dispatch
5 to 7 working days
Non-Stock / Large Sizes
10 to 15 working days
GST Invoice
HSN 73181590 — single consolidated invoice
MTC
Available on request — SS304 composition confirmed
Delivery
Pan India dispatch from Ahmedabad warehouse
Email
[email protected]
Frequently Asked Questions
+ What is the difference between a plain shank and a shoulder SS304 eye bolt?
A plain shank SS304 eye bolt has a straight cylindrical shank with no collar at the base. It is designed only for straight-line axial loading where the pull direction is exactly in line with the bolt axis. Any off-axis angle bends the shank and reduces the working load limit. At 45 degrees the load capacity of a plain shank eye bolt drops to only 30 percent of the straight-line WLL. A shoulder collared SS304 eye bolt has a machined circular collar at the shank base that bears against the mounting surface. This collar absorbs the bending moment from angled loads and allows the eye bolt to accept loads up to 45 degrees safely. For rigging applications where the load angle is uncertain or may exceed 5 degrees, always specify the shoulder type. KELOR supplies both plain shank and shoulder collared SS304 eye bolts in DIN 580 from M6 to M36.
+ Why choose SS304 over carbon steel for eye bolts?
SS304 stainless steel eye bolts provide inherent corrosion resistance without any coating, eliminating the risk of zinc flaking or coating degradation that occurs on zinc-plated carbon steel eye bolts in wet or humid environments. SS304 contains 18 percent chromium and 8 percent nickel, forming a passive oxide layer that prevents rusting. This makes SS304 eye bolts the preferred choice for food processing plants where zinc contamination is prohibited, pharmaceutical and GMP facilities requiring clean materials, outdoor and coastal-adjacent industrial environments where carbon steel corrodes rapidly, chemical plants with mild to moderate corrosive exposure, and any application where the eye bolt may be exposed to water, steam, or cleaning chemicals. While SS304 costs approximately 2 to 3 times more than zinc-plated carbon steel, the zero-maintenance corrosion resistance and compliance with food safety regulations justify the cost in most industrial applications. KELOR supplies forged SS304 DIN 580 eye bolts with WLL marked on shank from Ahmedabad.
+ What is the WLL of an SS304 M16 eye bolt at 45 degrees?
The straight-line WLL of a forged SS304 M16 DIN 580 eye bolt is 900 kg. At 45 degrees, the WLL is severely derated to only 30 percent of the straight-line value, which equals 270 kg. This means an SS304 M16 eye bolt rated 900 kg for straight vertical lifting can only safely support 270 kg when the load angle reaches 45 degrees. At 15 degrees the WLL remains at 80 percent which is 720 kg. At 30 degrees the WLL drops to 65 percent which is 585 kg. Above 45 degrees a DIN 580 eye bolt must not be used regardless of type. For any application with angled loading, KELOR strongly recommends the shoulder collared type which provides additional bending resistance. Always check the WLL table before specifying an eye bolt and never assume the rated load based on visual size alone.
+ What thread engagement depth is required for SS304 eye bolt installation?
The minimum thread engagement depth must equal at least 1.5 times the eye bolt nominal diameter. For an SS304 M20 eye bolt the minimum engagement is 30 mm. For M24 the minimum is 36 mm. For M30 the minimum is 45 mm. The base material being tapped must have strength equal to or greater than the SS304 eye bolt shank. If the base material is softer such as aluminium or low-grade cast iron the thread in the base may strip before the eye bolt reaches its WLL. In soft materials increase the thread engagement to 2 times the bolt diameter. For blind tapped holes verify the hole depth provides full thread engagement before installing the eye bolt. Partial thread engagement is one of the most common causes of eye bolt pull-out failure during lifting operations. KELOR provides installation guidelines with every order specifying the minimum engagement depth for each thread size.
+ Can SS304 eye bolts be used in food processing and pharmaceutical plants?
Yes, SS304 is the standard material specified for eye bolts used in food processing and pharmaceutical manufacturing environments. SS304 does not shed zinc particles or iron corrosion products that could contaminate food products or pharmaceutical batches. The smooth passive oxide surface of SS304 is easy to clean and sanitise using standard caustic or acid cleaning solutions without degrading the eye bolt surface. SS304 is compliant with FDA 21 CFR Part 174 requirements for stainless steel in food contact applications. For pharmaceutical GMP facilities SS304 lifting eye bolts are acceptable for equipment maintenance and rigging operations. For applications involving direct immersion in seawater or exposure to high chloride concentrations above 500 ppm, SS316 provides superior pitting resistance and should be specified instead. KELOR supplies SS304 DIN 580 eye bolts specifically for food and pharmaceutical plant rigging applications with full MTC certification.
+ What is the MOQ and delivery timeline for SS304 eye bolts from KELOR?
The MOQ for SS304 eye bolts is 10 pieces per thread size per type. Standard sizes from M6 to M24 in plain shank type with self-colour finish are dispatched within 5 to 7 working days from the Ahmedabad warehouse. Shoulder collared type and sizes M30 and M36 are available within 10 to 15 working days. Mixed size assortment kits for plant MRO stores covering M8 to M24 with 10 pieces per size are available as a single consignment with one GST invoice under HSN code 73181590. WhatsApp the complete size list with thread sizes, type plain or shoulder, quantity per size, and delivery location for pricing within 2 hours during business hours. KELOR has supplied SS304 eye bolts to food processing plants, pharmaceutical manufacturers, chemical plants, and general industrial facilities across Gujarat, Maharashtra, Karnataka, Tamil Nadu, Delhi NCR, and Rajasthan.
+ How do I verify that an SS304 eye bolt is genuine forged and not bent wire?
There are three visible indicators that distinguish a genuine forged SS304 eye bolt from a bent wire eye bolt. First, the grain structure at the eye-to-shank transition is continuous and flowing in a forged eye bolt, visible as smooth curved lines on the surface. In a bent wire eye bolt the grain structure shows a sharp bend and the inside of the eye bend may show surface cracking. Second, a forged eye bolt has WLL stamped on the shank with the thread size and supplier mark. Bent wire eye bolts typically have no markings because they are not rated for lifting. Third, a forged eye bolt has uniform cross-section through the entire eye with the eye inner diameter matching the DIN 580 specification. Bent wire eye bolts may have flattened or inconsistent cross-sections where the wire was bent. KELOR supplies only hot forged SS304 eye bolts with WLL marking on every piece, manufactured from a single continuous piece of SS304 bar stock with no weld joints in the eye.
+ Is SS304 eye bolt WLL the same as carbon steel for the same thread size?
Yes, for the same thread size and DIN 580 dimensions, the WLL of a forged SS304 eye bolt is equivalent to the WLL of a forged carbon steel eye bolt. This is because the WLL is determined by the physical dimensions of the eye and shank according to the DIN 580 standard, and SS304 has adequate tensile strength to meet these requirements. The minimum tensile strength of SS304 is approximately 515 MPa, which exceeds the minimum requirement for Grade 4.6 carbon steel (400 MPa). Therefore the SS304 eye bolt does not need to be derated compared to carbon steel of the same DIN 580 size. However, SS316 and higher alloy stainless steels have different strength characteristics and the WLL should be verified from the supplier certification for those grades. KELOR supplies SS304 eye bolts with WLL values matching DIN 580 standard ratings for each thread size.