Email:
[email protected]
Phone:
+91 93135 43530
Address:
133/1 Ground, Mansuri Block, Opp. Dudheshwar Water Tank, Ahmedabad-380004, Gujarat, India
Wedge Lock Washers — Indian Manufacturer | SS304 & SS316 | M3 to M27 | KELOR, Ahmedabad
Indian-made anti-loosening wedge lock washer pairs in SS304 and SS316 — engineered equivalent to imported cam lock washers. Vibration-proof bolt locking for critical structural, piping, rail, and industrial applications. Supplied as matched pairs with serrated cam faces.
Available Sizes: M3 · M4 · M5 · M6 · M8 · M10 · M12 · M14 · M16 · M18 · M20 · M22 · M24 · M27 · MOQ 100 Pairs · GST Invoice (GSTIN: 24AKLPP6499B1ZT) · Pan India Dispatch · 2-Hour Quote
Available Sizes — Supplied as Matched Pairs
M3
M4
M5
M6
M8
M10
M12
M14
M16
M18
M20
M22
M24
M27
A wedge lock washer (also called a cam lock washer or anti-loosening washer) is a precision-engineered bolt locking system consisting of two identical washers supplied as a matched pair. The outer faces of each washer have radial teeth (serrations) that grip the bolt head / nut face and the joint surface. The inner faces have cam profiles — opposing wedge ramps that, when the bolt tries to rotate loose under vibration, force the cam faces to ride up and actually increase clamp force rather than decrease it. This geometry makes wedge lock washers the most reliable mechanical bolt locking solution available — outperforming spring washers, nylock inserts, thread-locking compounds, and serrated flange nuts in high-vibration and dynamic-load applications.
Krishna Industries (KELOR), Ahmedabad, supplies Indian-manufactured wedge lock washers in SS316 — a domestically produced, cost-effective alternative to expensive imported cam lock washer brands. GST invoice. Pan India dispatch. MOQ 100 pairs.
🇮🇳 Why Indian-Made Wedge Lock Washers — Not Imported?
Imported European cam lock washers deliver excellent performance — but at import-price + lead time + currency fluctuation cost. For Indian infrastructure, EPC, and industrial projects, Indian-manufactured equivalents offer:
✅ 30–50% lower cost vs imported European brands at equivalent material specification
✅ Ready stock in India — no 4–8 week import lead time; dispatch from Ahmedabad in 2–5 working days
✅ GST invoice with ITC credit — imported product invoices often do not integrate cleanly into Indian GST claims
✅ Make in India — supports domestic manufacturing; preferred in government and PSU project procurement
✅ SS316 marine grade — same material specification as the imported alternatives
How Wedge Lock Washers Work — The Cam-Lock Principle
Understanding the cam-lock principle is what separates this product from ordinary lock washers. The mechanism is why wedge lock washers outperform every other bolt locking system in vibration-critical applications.
| Feature | Standard Spring Lock Washer | Wedge Lock Washer (Cam) |
|---|---|---|
| Locking principle | Spring tension — compressed by bolt; tries to “spring back” to resist loosening. This tension decays rapidly under dynamic loading. | Geometric wedge — cam ramp angle exceeds bolt thread helix angle. When bolt tries to rotate loose, cam faces ride up each other, increasing clamp load rather than decreasing it. |
| Vibration performance | Fails the Junker vibration test (DIN 65151) rapidly — spring washers have been shown to provide no significant improvement over a plain washer in high-vibration service | Passes Junker vibration test indefinitely — clamping force maintained through thousands of vibration cycles because loosening rotation is physically impossible while cam geometry is engaged |
| Reusability | Single use — spring permanently deforms on first torquing | ✅ Reusable up to 5–6 assembly cycles — cam and serration geometry retained if not damaged |
| Cam ramp angle | N/A | Cam ramp angle (typically 10–12°) exceeds M-series bolt thread helix angle (typically 2–4°) — this geometric relationship is the fundamental operating principle |
| Outer serrations | No serrations — smooth contact | Radial teeth on outer faces grip the bolt head underside and joint surface — prevents the washer pair from rotating as a unit, ensuring only the two cam faces move relative to each other |
| Standards | DIN 127 | No specific DIN standard — proprietary geometric principle; specified by functional test (Junker DIN 65151) and cam ramp angle geometry |
ℹ️ The Junker Test (DIN 65151) is the internationally recognised standard for evaluating bolt loosening under transverse vibration. It subjects bolted joints to high-frequency lateral displacement and measures residual clamping force over cycles. Spring lock washers, serrated nuts, and nylon insert nuts all fail this test at moderate vibration levels. Wedge lock washer systems maintain clamping force through the full test duration. Specify wedge lock washers for any joint that must pass a Junker-test vibration requirement.
Installation — How to Install Wedge Lock Washers Correctly
Correct installation is essential — wedge lock washers installed incorrectly provide no benefit. Follow these steps:
| Step | Action | Why It Matters |
|---|---|---|
| Step 1 | Place the two washers together as a matched pair with cam faces touching each other (the two inner cam faces face each other — they look identical when correctly assembled) | Cam faces must be in contact with each other — not with the bolt head or joint surface — for the cam geometry to function |
| Step 2 | Place the assembled pair under the bolt head or nut. The serrated outer faces must contact the bolt head underside and the joint surface respectively | Serrations grip the bolt head and substrate — they prevent the washer pair from rotating as a unit during bolt loosening attempts |
| Step 3 | Tighten bolt to the standard torque for the bolt grade — do NOT reduce torque because of the washers | Wedge lock washers require full bolt preload to function. Under-torqued bolts allow the serrations to slip, disengaging the cam geometry |
| Step 4 | Do not use grease or lubricant on the outer serrated faces — anti-seize on bolt threads is acceptable and recommended | Lubricant on serrated faces reduces grip and allows washer rotation — this defeats the cam geometry. Thread lubrication is independent and does not affect washer function |
| Step 5 (Reuse) | On removal, keep pairs together — do not mix washers from different pairs. Inspect serrations and cam faces for damage before reuse | Cam faces are matched during manufacture — mixing pairs degrades performance. Damaged serrations cannot grip and must be replaced |
⚠️ Common Installation Mistakes:
❌ Installing with cam faces facing outward (touching bolt head and surface) — this is wrong; cam faces must face each other
❌ Using a single washer instead of a pair — always use as a matched pair
❌ Lubricating the outer serrated faces — removes grip and defeats the locking function
❌ Using with soft substrate materials (aluminium, GRP, plastic) without a hardened backing washer — serrations must grip a hard surface to prevent rotation; specify a hardened plain washer under the assembly for soft substrates
❌ Installing with cam faces facing outward (touching bolt head and surface) — this is wrong; cam faces must face each other
❌ Using a single washer instead of a pair — always use as a matched pair
❌ Lubricating the outer serrated faces — removes grip and defeats the locking function
❌ Using with soft substrate materials (aluminium, GRP, plastic) without a hardened backing washer — serrations must grip a hard surface to prevent rotation; specify a hardened plain washer under the assembly for soft substrates
Technical Specifications — SS316 Wedge Lock Washer
| Parameter | Specification |
|---|---|
| Product | Wedge Lock Washer (Cam Lock Washer / Anti-Loosening Washer) — supplied as matched pairs |
| Material | SS304 (AISI 304 / A2 / DIN 1.4301) and SS316 (AISI 316 / A4 / DIN 1.4401) — also available in Dakro Style (zinc-flake coated) for carbon steel bolt assemblies |
| Surface Finish | Bright (passivated) — standard | Electropolished on request for food / pharma applications |
| Cam Ramp Angle | 10–12° (exceeds M-series thread helix angle — functional locking geometry) |
| Outer Serrations | Radial teeth — hardened, precision-formed to grip bolt head underside and joint surface |
| Size Range | M3 to M27 (metric coarse thread series) — see KELOR model number table below |
| Supply Unit | Pairs — each order quantity is in pairs (1 pair = 2 washers) |
| Pressure Rating | Matches bolt grade — suitable for use with A4-80 (SS316) and higher bolts; for carbon steel bolts up to Grade 8.8 / 10.9 |
| Temperature Range | -200°C to +450°C (SS316 material limits) |
| Vibration Standard | Designed to pass Junker Vibration Test (DIN 65151) — test reports available on request |
| Reusability | Up to 5–6 assembly cycles — inspect serrations and cam faces between uses |
| Country of Origin | India 🇮🇳 |
| MOQ | 100 pairs per size |
| HSN Code | 73182200 (washers) |
| GST Rate | 18% |
KELOR Wedge Lock Washer Dimensions — M3 to M27
All dimensions in mm. Supplied as matched pairs. Two finish options: SS304/SS316 Style (standard stainless, thicker pair) and Dakro Style (zinc-flake coated, slightly thinner — for carbon steel bolt assemblies). Inner diameter (d) slightly larger than bolt nominal diameter for easy assembly.
| KELOR Model | Bolt Size | Inner DIA — d (mm) | Outer DIA — dc (mm) | SS304/316 Pair Height h (mm) | Dakro Style Pair Height h (mm) |
|---|---|---|---|---|---|
| KL3SP | M3 | 3.4 | 7.6 | 2.2 | 1.8 |
| KL4SP | M4 | 4.4 | 9.0 | 2.2 | 1.8 |
| KL5SP | M5 | 5.4 | 10.8 | 2.2 | 1.8 |
| KL6SP | M6 | 6.5 | 13.5 | 2.2 | 1.8 |
| KL8SP | M8 | 8.7 | 16.6 | 2.2 | 2.5 |
| KL10SP | M10 | 10.7 | 21.0 | 2.2 | 2.5 |
| KL12SP | M12 | 13.0 | 25.5 | 3.2 | 2.5 |
| KL14SS | M14 | 15.2 | 30.7 | 3.2 | 3.4 |
| KL16SP | M16 | 17.0 | 30.7 | 3.2 | 3.4 |
| KL18SP | M18 | 19.5 | 34.5 | 3.2 | 3.4 |
| KL20SP | M20 | 21.4 | 39.0 | 3.2 | 3.4 |
| KL22SP | M22 | 23.7 | 42.0 | 3.2 | 4.6 |
| KL24SP | M24 | 25.3 | 48.5 | 4.6 | 4.6 |
| KL27SS | M27 | 28.5 | 42.0 | — | 5.5 |
ℹ️ How to order: Quote the KELOR Model number (e.g. KL16SP SS316) for precise ordering. SP suffix = standard washer pair; SS suffix = special size. All dimensions are per-pair (both washers combined). The SS304/316 Style h value is the total height of the assembled pair in SS304 or SS316 stainless. Dakro Style is a zinc-flake coated variant for use with carbon steel bolts in corrosive environments — not recommended for marine / SS assemblies; specify SS Style for all stainless bolt applications.
Bolt Locking Method Comparison — Why Wedge Lock Outperforms Alternatives
This is the most-searched question for engineers selecting bolt locking for vibration-critical applications. Use this table to justify the specification to procurement or project teams.
| Method | Junker Test Result | Max Temp | Reusable? | Removable? | Verdict |
|---|---|---|---|---|---|
| Wedge Lock Washer | ✅ Passes — maintains clamp force | +450°C | ✅ Yes (5–6 cycles) | ✅ Yes — fully removable | ⭐ Best for critical vibration service |
| Spring Lock Washer (DIN 127) | ❌ Fails — clamp force lost rapidly | +300°C | ❌ Single use | ✅ Yes | Poor — widely used but not effective in vibration |
| Nylock Nut (DIN 985) | ⚠️ Moderate — nylon degrades with cycles | +120°C | ❌ Single use | ✅ Yes | Good for moderate vibration; fails above 120°C |
| All-Metal Lock Nut (DIN 980) | ⚠️ Moderate — degrades over cycles | +250°C | ⚠️ Limited | ✅ Yes | Better than nylock for high temp; good not best |
| Thread-Lock Adhesive (Loctite) | ✅ Good initially — degrades over time | +150°C (standard grade) | ❌ Single use | ⚠️ Difficult — requires heat or impact | Good for small fasteners; problematic for maintenance access |
| Castellated Nut + Cotter Pin | ✅ Excellent — positive mechanical lock | +400°C | ⚠️ Cotter pin single use | ⚠️ Time-consuming removal | Very reliable but labour-intensive; used in aerospace/rail |
| Lock Wire (Safety Wire) | ✅ Excellent — positive mechanical lock | +500°C | ❌ Single use | ⚠️ Cuts required — time-consuming | Best for extreme vibration; requires skilled installation |
Indian-Made Wedge Lock Washer vs Imported European Brand
🇮🇳 Indian-Made (KELOR Supply)
- Same SS316 material grade — identical corrosion resistance
- Same cam-lock operating principle and geometry
- 30–50% lower unit price vs imported equivalent
- Ready stock in Ahmedabad — 2–5 working day dispatch
- GST invoice with full ITC credit — clean Indian billing
- Make in India — preferred for government/PSU procurement
- No import duty, no customs clearance, no forex risk
- MOQ 100 pairs — accessible for project quantities
- MTC available — material certifiable for EPC documentation
- Local technical support — WhatsApp response within 2 hours
🌍 Imported European Brand
- SS316 material grade — same
- Patented cam geometry with decades of Junker test data
- Premium price — import duty + distributor margin + forex
- 4–8 week lead time from international stock
- Import invoice — GST ITC may require additional documentation
- High brand recognition — may be specified by name in older project specs
- Wider size range available (down to M5)
- Full published test data library — Junker curves by size and grade
- Premium for critical aerospace / defence applications
- Stocked by select Indian distributors at premium price
ℹ️ When to specify Indian-made vs imported: For the majority of industrial, EPC, construction, marine, and infrastructure applications in India, Indian-manufactured wedge lock washers deliver equivalent performance at significantly lower cost and shorter lead time. The imported brand premium is justified for: aerospace and defence applications requiring full OEM-endorsed Junker test certification, projects where the original equipment specification names a specific brand by patent reference, and applications above M30 or below M8 (outside the Indian-made range). For all other applications, Indian-made SS316 wedge lock washers are the practical and cost-effective choice.
Applications — Where Wedge Lock Washers Are Specified
🚂 Rail & Infrastructure
Track fastening bolts, fishplate bolts, bridge structural connections, and railway infrastructure where vibration from rolling stock is continuous and intense.
⚡ Wind & Solar Energy
Wind turbine tower flange bolts, nacelle assembly, and solar panel racking bolts on rooftop and ground-mount structures subject to wind-induced vibration.
🏭 Rotating Machinery
Pump casing bolts, compressor flanges, motor mounting bolts, centrifuge connections, and any rotary equipment where cyclic vibration is present during operation.
⛽ Oil & Gas
Pipeline structural clamp bolts, wellhead equipment, offshore platform deck connections, and process plant flanges subject to flow-induced vibration and thermal cycling.
⚓ Marine & Offshore
SS316 wedge lock washers for vessel structural bolts, offshore platform connections, and marine equipment where seawater corrosion AND vibration resistance are both required.
🚗 Automotive & Transport
Suspension system bolts, exhaust bracket connections, chassis cross-member bolts, and any automotive structural joint subject to road vibration and dynamic load.
🏗️ Structural Steel
Structural steel connections in high-vibration environments — stadium roofing, crane runway girders, gantry structures, and industrial building frames near heavy machinery.
🔌 Electrical & Telecom
Transmission tower bolts, substation equipment mounting, and telecom tower structural connections where wind-induced vibration loads are sustained over the full service life.
Available Material Grades
Both SS304 (A2) and SS316 (A4) are standard supply. Other grades available on request:
| Grade | Designation | Key Property | Specify For |
|---|---|---|---|
| SS316 (Standard) | AISI 316 / A4 / DIN 1.4401 | Chloride pitting resistance — marine grade | Marine, coastal, offshore, chemical, outdoor — all standard applications |
| SS304 | AISI 304 / A2 / DIN 1.4301 | General corrosion resistance | Indoor, non-chloride environments — lower cost option where SS316 is over-specified |
| SS316L | AISI 316L / DIN 1.4404 | Low carbon — weld corrosion resistance | Food GMP, pharmaceutical, and chemical plant where electropolished finish is required |
| Duplex 2205 | UNS S32205 / DIN 1.4462 | High strength + chloride pitting | Offshore structural bolting under high preload in aggressive marine environments |
How to Order Wedge Lock Washers from KELOR
Share on WhatsApp or Email — include all of the following:
1. Bolt size — M8 / M10 / M12 / M16 / M20 / M24 / M30 (specify all sizes required)
2. Material grade — SS316 (standard) / SS304 / SS316L / Duplex
3. Quantity — in pairs (e.g. “500 pairs M16 SS316”)
4. Application — helps confirm correct size and grade
5. Test certificate required? — Junker test report / MTC / dimensional report
6. Delivery location (for freight calculation)
📱 WhatsApp: +91 93135 43530 | 📧 Email: [email protected]
1. Bolt size — M8 / M10 / M12 / M16 / M20 / M24 / M30 (specify all sizes required)
2. Material grade — SS316 (standard) / SS304 / SS316L / Duplex
3. Quantity — in pairs (e.g. “500 pairs M16 SS316”)
4. Application — helps confirm correct size and grade
5. Test certificate required? — Junker test report / MTC / dimensional report
6. Delivery location (for freight calculation)
📱 WhatsApp: +91 93135 43530 | 📧 Email: [email protected]
Why Buy from Krishna Industries?
🇮🇳
Indian Manufacturer Supply
Domestic production — no import lead time, no customs, no forex risk. Ready stock in Ahmedabad for M3 to M27 in SS304 and SS316.
💰
30–50% vs Imported
Indian-made SS316 at 30–50% lower price than imported European equivalents. Same material, same cam geometry, fraction of the cost.
📄
Full Documentation
GST invoice, MTC for SS316 material, dimensional inspection report, and Junker test reports available on request for EPC and project orders.
⚡
2-Hour Quote
WhatsApp sizes, quantities, and grade — confirmed price and delivery within 2 business hours. No lengthy import quotation process.
🚚
Pan India Dispatch
Dispatch from Ahmedabad via VRL Logistics, DTDC, and Professional Courier to all major cities. Standard courier for sizes up to M24.
✅
GSTIN Verified
GSTIN: 24AKLPP6499B1ZT | IEC: AKLPP6499B. All invoices valid for ITC claims. GST-compliant billing on every order.
Get Wedge Lock Washer Price — Indian-Made SS316 — 2-Hour Response
M8 · M10 · M12 · M16 · M20 · M24 · M30 · SS316 Marine Grade · Indian Make · Cam-Lock Anti-Vibration · GST Invoice · Pan India Dispatch
📲 WhatsApp for PriceQuick Specification Summary
| Parameter | Details |
|---|---|
| Product | Wedge Lock Washer (Cam Lock Washer / Anti-Loosening Washer) — Indian Make |
| Standard Material | SS304 (AISI 304 / A2) and SS316 (AISI 316 / A4) — both standard stock; Dakro Style (zinc-flake) on request |
| Other Grades | SS304, SS316L, Duplex 2205 on request |
| Size Range | M3 to M27 — models KL3SP to KL27SS |
| Supply Unit | Pairs — always ordered and supplied as matched pairs |
| Cam Ramp Angle | 10–12° (exceeds thread helix angle) |
| Vibration Standard | Designed to pass Junker Test DIN 65151 |
| Temperature Range | -200°C to +450°C (SS316) |
| MOQ | 100 pairs per size |
| HSN Code | 73182200 |
| GST Rate | 18% |
| Country of Origin | India |
| MTC Available | Yes — on request |
| GSTIN | 24AKLPP6499B1ZT |
Frequently Asked Questions — Wedge Lock Washers
What is a wedge lock washer and how is it different from a spring lock washer?
A wedge lock washer (cam lock washer) is a precision anti-loosening device supplied as a matched pair. The inner faces of the two washers have opposing cam ramps — when a bolt attempts to rotate loose under vibration, these cam ramps ride up on each other, geometrically forcing the clamp load to increase rather than decrease. This is the opposite of what happens with a spring lock washer (DIN 127), which merely provides a spring force that decays rapidly under vibration. The Junker vibration test (DIN 65151) — the internationally accepted standard for evaluating bolt loosening under transverse vibration — demonstrates that spring lock washers provide negligible improvement over plain washers in vibration service. Wedge lock washers maintain full clamp force through thousands of vibration cycles because the cam geometry physically prevents loosening rotation while the bolt is under preload.
Is the Indian-made wedge lock washer equivalent to imported European cam lock washers?
For the material specification — yes. Both are SS316 (AISI 316 / A4), providing identical corrosion resistance, temperature performance, and magnetic properties. The cam-lock operating principle is the same: cam ramp angle exceeding the bolt thread helix angle, combined with radial serrations on outer faces. The functional difference is in the precision of the cam geometry and the depth of independent Junker test certification data — imported European brands have decades of published Junker test curves across all sizes and grades, which is valuable for projects requiring full documentary proof of vibration resistance. Indian-made washers deliver the same operating principle and material at 30–50% lower cost, with Indian stock availability and GST invoice. For EPC, industrial, marine, and infrastructure projects in India where functional performance rather than OEM brand certification is the requirement, Indian-made wedge lock washers are the correct and cost-effective choice.
Can wedge lock washers be used with stainless steel bolts (A4-80)?
Yes — SS316 wedge lock washers are the correct pairing for A4-80 (SS316) bolts. Using SS316 washers with SS316 bolts and SS316 nuts provides a fully compatible corrosion-resistant assembly with no galvanic incompatibility. One important note: SS316 bolts are susceptible to galling (thread seizure) when torqued against SS316 nuts without lubrication — always apply anti-seize paste to bolt threads. The anti-seize is applied to the threads only, not to the outer serrated faces of the washers (which must remain dry for the serrations to grip). With proper thread lubrication and correct installation, SS316 wedge lock washer pairs with SS316 A4-80 bolts and nuts provide the optimal combination of vibration resistance and marine-grade corrosion resistance.
What is the Junker test and why does it matter for wedge lock washers?
The Junker test (DIN 65151 / ISO 16130) is the internationally recognised standard test for evaluating the loosening behaviour of bolted joints under transverse (lateral) vibration. A test specimen bolt joint is assembled and subjected to high-frequency lateral displacement — the residual clamping force (bolt preload) is measured over thousands of cycles. A joint that maintains clamping force passes the test; a joint that loses clamping force (the bolt loosens) fails. The Junker test demonstrates that spring lock washers and serrated nuts lose most of their clamping force within the first 20–50 cycles of vibration. Wedge lock washer systems maintain near-100% of initial clamping force through the full test duration, because the cam geometry physically prevents loosening. When a project specification, quality plan, or client data sheet requires “Junker test compliance” or references DIN 65151, wedge lock washers are the specified product. Junker test reports for our Indian-made wedge lock washers are available on request for project documentation.
Can wedge lock washers be reused after removing the bolt?
Yes — wedge lock washers can be reused for up to 5–6 assembly cycles if the serrations and cam faces are undamaged. On each removal, keep the two washers of each pair together — do not mix washers from different pairs as the cam faces are matched during manufacture and mixing pairs degrades performance. Before reuse, visually inspect the serration teeth (should be sharp and undamaged) and the cam faces (should show no galling, flattening, or cracking). Discard and replace any pair where serrations are worn flat, cam faces are galled, or either washer is deformed. This reusability is a significant advantage over spring lock washers (single use only) and nylock nuts (single use only), particularly for maintenance-intensive applications where bolts are regularly removed for inspection.
What are the MOQ and lead time for SS316 wedge lock washers?
MOQ is 100 pairs per size for standard SS316. For mixed-size project orders (e.g. 200 pairs M12 + 300 pairs M16 + 150 pairs M20 all SS316), the full order is treated as a single shipment with a single GST invoice. Ready stock is maintained for M12, M16, M20, and M24 in SS316 — these sizes dispatch within 2–3 working days. Other sizes (M8, M10, M14, M18, M22, M27, M30) are on 5–10 working days lead time. For SS304, SS316L, or Duplex 2205 grades, lead time is 2–3 weeks. WhatsApp sizes, quantities, and grade for confirmed price and availability within 2 hours.