Email:
[email protected]
Phone:
+91 93135 43530
Address:
133/1 Ground, Mansuri Block, Opp. Dudheshwar Water Tank, Ahmedabad-380004, Gujarat, India
Threaded Flange (Screwed Flange) supplier in Ahmedabad, Gujarat. ASME B16.5 — Carbon Steel A105, Stainless Steel A182 F304 / F316 / F316L, Alloy Steel F11 / F22, Duplex F51 — Class 150, 300, 600, 900, 1500, 2500 — ½” to…
Threaded Flange | A105 SS304 SS316 | ASME B16.5 | Class 150–2500 | Supplier India
Price on Request
About Company
- KRISHNA INDUSTRIES
- GST No. : 24AKLPP6499B1ZT
- Ahmedabad, Gujarat, India
- Manufacturer, Traders & Wholesale Supplier
- Year of Establishment : Since 1985
- Annual Turnover : Below Rs. 25 Crore Approx.
- Banker : APANI SAHAKARI BANK LIMITED
- Company CEO : Ruchin Panchal
- Constitution of Business : Proprietorship
- Leading Valve Supplier in India covering Maharashtra, Gujarat, Tamil Nadu, Karnataka, Telangana, Delhi NCR, West Bengal, Rajasthan, Madhya Pradesh, Uttar Pradesh, Punjab, Haryana, Andhra Pradesh, Odisha, Chhattisgarh, Jharkhand, Bihar, Kerala, Assam.
- Major Industrial Supply Cities: Ahmedabad, Vadodara, Rajkot, Surat, Mumbai, Pune, Thane, Nashik, Nagpur, Chennai, Coimbatore, Bengaluru, Hyderabad, Delhi, Noida, Gurugram, Faridabad, Kolkata, Jaipur, Indore, Bhopal, Lucknow, Kanpur, Ludhiana, Visakhapatnam.
Description
Threaded Flange Supplier India | A105 / SS304 / SS316 | ASME B16.5 | Class 150–2500 | KELOR
Supplier: Krishna Industries (KELOR) – Ahmedabad, Gujarat, India
Established: 2017 | GSTIN: 24AKLPP6499B1ZT | IEC: AKLPP6499B
MOQ: 10 Nos | Sizes: ½” to 24″ (DN15–DN600) | Standard: ASME B16.5
Pressure Class: 150 / 300 / 600 / 900 / 1500 / 2500
Introduction – Threaded Flange Supplier India
Krishna Industries (KELOR), based in Ahmedabad, Gujarat, India, is a trusted B2B supplier of Threaded Flanges (Screwed Flanges) sourced from verified Indian manufacturers. We supply Threaded Flanges in Carbon Steel (ASTM A105), Stainless Steel (A182 F304 / F316 / F316L), Alloy Steel (A182 F11 / F22 / F5), and Duplex Steel (A182 F51 / F53) — conforming to ASME B16.5 — Class 150, 300, 600, 900, 1500, and 2500 — sizes ½” to 24″ — NPT, BSPT, and BSPP threading — Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ) facing.
A Threaded Flange — also called a Screwed Flange — has an internally threaded bore that screws directly onto an externally threaded pipe end. No welding is required for installation. This is the defining advantage of threaded flanges — they can be installed in hazardous areas, explosive environments, and locations where hot work (welding) permits are not available or practical, making them the standard flanging solution for fire fighting systems, fuel handling, compressed air, and instrument connections across Indian industrial projects.
Also referred to as: Screwed Flange, Threaded Pipe Flange, NPT Flange, BSP Flange, Screwed End Flange — all referring to the same product across Indian project documents, piping material specifications, and procurement BOMs.
Threaded Flange vs Other Flange Types — When to Specify Which
EPC piping engineers and purchase managers must select the correct flange type for each service. Here is the complete selection guide — the most-searched comparison in Indian B2B industrial piping:
| Flange Type | Connection Method | Pressure Limit | Best For | Not Suitable For |
|---|---|---|---|---|
| Threaded (Screwed) | Screwed onto pipe threads — no welding | Class 600 max recommended (see note) | Hazardous areas, small bore, no-weld zones, fire fighting, instrument lines | High temp above 260°C, cyclic pressure, vibration service |
| Slip-On (SORF) | Slides over pipe — two fillet welds | Class 300 typical — up to Class 2500 | General purpose — most economical welded flange | High pressure above Class 300, high temp creep service |
| Weld Neck (WNRF) | Butt weld to pipe — single full penetration weld | ✅ All classes — up to Class 2500 | High pressure, high temp, cyclic, lethal service — strongest joint | Where cost is primary concern — most expensive flange type |
| Blind Flange | No bore — bolted to flange face to seal pipeline end | All classes — up to Class 2500 | Line termination, isolation blanking, future connection | Flowing service |
| Socket Weld (SWRF) | Pipe inserts into socket — single fillet weld | Class 3000 / 6000 (small bore) | Small bore high pressure — Class 800+ process lines | Large bore above 50mm, corrosive service (crevice corrosion risk) |
| Lap Joint | Used with stub end — loose flange over stub | Same as WNRF | Frequent disassembly, lined pipe, bolt hole alignment | High temperature — stub end limits service |
Important note for EPC engineers: ASME B16.5 lists threaded flanges in Classes 150 through 2500 — but ASME B31.3 Process Piping Code restricts threaded flanges to Class 600 and below in most process services, and further restricts their use above 260°C (500°F). Always check your applicable piping code before specifying threaded flanges for process service. For fire fighting, instrument connections, utility air, and fuel lines — threaded flanges are unrestricted.
Complete Material Grade Guide
| Material | Grade | Pressure Class | Temp Range | Best For | Typical Application |
|---|---|---|---|---|---|
| Carbon Steel | ASTM A105 (forged) | Class 150–2500 | -29°C to +425°C | General industrial — most common grade | Water, oil, gas, steam, general process utility |
| Stainless Steel 304 | ASTM A182 F304 | Class 150–2500 | -196°C to +425°C | Corrosion-resistant general service | Chemical plant, food, pharma, water, utility |
| Stainless Steel 316 | ASTM A182 F316 | Class 150–2500 | -196°C to +425°C | Higher corrosion — chloride and chemical service | Aggressive chemical, pharma GMP, coastal, offshore |
| Stainless Steel 316L | ASTM A182 F316L | Class 150–2500 | -196°C to +425°C | Low carbon — weld sensitisation resistant | Pharmaceutical, food, welded SS piping systems |
| Alloy Steel F11 | ASTM A182 F11 (1.25Cr-0.5Mo) | Class 150–2500 | up to +540°C | High temperature chrome-moly | Power plant steam, refinery high temp process |
| Alloy Steel F22 | ASTM A182 F22 (2.25Cr-1Mo) | Class 150–2500 | up to +600°C | Very high temp — highest chrome-moly grade | Hydrocracker, reformer, high pressure steam |
| Duplex Steel | ASTM A182 F51 (UNS S31803) | Class 150–2500 | -50°C to +300°C | High strength + chloride corrosion resistance | Offshore seawater, chloride chemical service |
| Mild Steel | IS 2062 / IS 6392 | PN10 / PN16 | -10°C to +250°C | Non-critical utility service — most economical | Water utility, HVAC, fire fighting, general service |
Threading Standards — NPT vs BSPT vs BSPP
| Thread Type | Standard | Thread Profile | Sealing Method | Common Use in India |
|---|---|---|---|---|
| NPT | ANSI / ASME B1.20.1 | Tapered — 60° included angle | Thread taper creates seal — PTFE tape used | US-standard projects — oil and gas, ANSI piping systems |
| BSPT | BS 21 / ISO 7-1 | Tapered — 55° Whitworth angle | Thread taper creates seal — PTFE tape used | British-standard projects — older refineries, British-spec plants |
| BSPP | BS 2779 / ISO 228 | Parallel — 55° Whitworth angle | Face seal / O-ring — thread does not seal | Hydraulic, instrument, equipment connections — not pipeline flanges |
For Indian EPC projects: NPT (ANSI) is specified in most oil and gas and process industry projects. BSPT is specified in British-standard and older projects. Always confirm thread standard from your project piping specification before ordering — NPT and BSPT are NOT interchangeable.
Flange Facing Types
| Facing Type | Description | Gasket Used | Typical Use |
|---|---|---|---|
| Raised Face (RF) | Raised circular seating area — standard ASME B16.5 | Spiral wound, ring, soft gasket | ✅ Most common — all industrial process and utility flanges |
| Flat Face (FF) | Flat across entire face — same level as bolt circle | Full face gasket | Cast iron valves, pumps, equipment with flat face counterparts |
| Ring Type Joint (RTJ) | Groove machined for metal ring gasket | Oval or octagonal metal ring | High pressure Class 600 and above — oil and gas wellhead, refinery |
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Threaded Flange (Screwed Flange) |
| Design Standard | ASME B16.5 / BS 4504 / IS 6392 |
| Dimensional Standard | ASME B16.5 (inch) / EN 1092-1 (metric) |
| Size Range | ½” to 24″ (DN15 to DN600) |
| Pressure Class | Class 150 / 300 / 600 / 900 / 1500 / 2500 |
| Thread Type | NPT (ANSI B1.20.1) / BSPT (BS 21) / BSPP (BS 2779) |
| Flange Facing | Raised Face (RF) / Flat Face (FF) / Ring Type Joint (RTJ) |
| Bore | Full bore matching pipe inside diameter |
| Testing Standard | ASME B16.5 / ASTM A105 / A182 |
| Surface Finish | RF: 125–250 AARH (3.2–6.3 Ra) | RTJ: 63 AARH (1.6 Ra) |
| MOQ | 10 Nos |
| HSN Code | 73079190 |
All Material Variants — Full Keyword Coverage
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Applications in Indian Industries
- Fire fighting systems — no-weld installation mandatory in hazardous / explosive areas
- Fuel and oil handling — screwed connections in areas where hot work permits restricted
- Compressed air systems — instrument and utility air supply taps and headers
- Instrument impulse lines — small bore connections to pressure gauges, transmitters, instruments
- Chemical plant utility lines — low pressure cooling water, service water, utility headers
- Pharmaceutical plants — SS316 / SS316L screwed flanges for GMP utility connections
- Food processing — SS304 / SS316 screwed flanges — hygienic disassembly without hot work
- Offshore platforms — no-weld connections in explosive atmosphere zones
- Power plant auxiliary — instrument and utility connections, small bore service lines
- EPC infrastructure projects — BOM-based bulk supply for piping material packages
EPC Contractors — Bulk Flange Supply
- Complete piping BOM flange supply — threaded, slip-on, weld neck, blind in single order
- All material grades in single consolidated order — A105, F304, F316, F11, F22 together
- Material Test Certificates (MTC) — ASTM A105 / A182 with heat number
- Dimensional inspection records per ASME B16.5 on request
- GST invoices — GSTIN: 24AKLPP6499B1ZT
- E-way bill and delivery challan for PAN India transport
- Fast dispatch from Ahmedabad — 3 to 7 working days standard grades
- Competitive project-rate bulk pricing with confirmed lead times
As a multi-product B2B supplier, Krishna Industries consolidates Threaded Flanges with Slip-On Flanges, Weld Neck Flanges, Blind Flanges, Stud Bolts, Gaskets, Gate Valves, Ball Valves, and Pipe Fittings in single orders — single GST invoice, single dispatch.
PAN India Supply Coverage
Maharashtra — Mumbai, Pune, Navi Mumbai, Nashik, Aurangabad, Nagpur
Gujarat — Ahmedabad, Surat, Vadodara, Rajkot, Bharuch, Ankleshwar, Vapi, Dahej
Rajasthan — Jaipur, Jodhpur, Udaipur, Kota, Bhilwara, Alwar
Delhi NCR — Delhi, Noida, Gurgaon, Faridabad, Ghaziabad
Tamil Nadu — Chennai, Coimbatore, Madurai, Tirupur, Salem
Karnataka — Bangalore, Hubli, Mysore, Belgaum, Mangalore
Telangana and Andhra Pradesh — Hyderabad, Vizag, Vijayawada, Kakinada
Madhya Pradesh — Indore, Bhopal, Jabalpur, Pithampur
Punjab and Haryana — Ludhiana, Amritsar, Chandigarh, Panipat
West Bengal — Kolkata, Durgapur, Asansol, Haldia
Odisha, Jharkhand, Chhattisgarh — all industrial zones
Export supply FOB Mundra / JNPT. IEC registered — IEC: AKLPP6499B.
Related Products from Krishna Industries
- Slip-On Flange (SORF) — two fillet welds, most economical welded flange
- Weld Neck Flange (WNRF) — butt weld, highest strength for high pressure service
- Blind Flange — pipeline end closure and blanking
- Socket Weld Flange (SWRF) — small bore high pressure socket weld connection
- Stud Bolt A193 B7 / B8M — matched fasteners for all flange classes
- Spiral Wound Gasket — RF flange sealing for process service
- Gate Valve — full bore isolation for flanged pipeline connections
Frequently Asked Questions
1. What is a threaded flange?
A threaded (screwed) flange has an internally threaded bore that screws directly onto an externally threaded pipe end — no welding required. Conforming to ASME B16.5, available in Class 150 to Class 2500, in Carbon Steel A105, SS304, SS316, and other grades. The no-weld installation makes it essential for hazardous areas and fire fighting systems.
2. When should I specify threaded flange vs weld neck flange?
Specify threaded flange when welding is not permitted (hazardous / explosive atmosphere), when future frequent disassembly is needed, or for small bore instrument and utility connections. Specify weld neck flange for high pressure Class 600 and above, high temperature above 260°C, cyclic service, and lethal or toxic fluid service where joint integrity is critical.
3. Can threaded flanges be used in high pressure service?
ASME B16.5 lists threaded flanges in Class 150 through Class 2500. However, ASME B31.3 Process Piping Code limits threaded flanges in most process services to Class 600 and below, and further restricts use above 260°C. Always verify against your applicable piping code and project specification before ordering high pressure threaded flanges.
4. What is the difference between NPT and BSPT threading?
NPT (ANSI B1.20.1) has a 60° thread angle — standard for US and ANSI projects. BSPT (BS 21) has a 55° Whitworth angle — standard for British projects. They are NOT interchangeable — matching thread standard on both pipe and flange is mandatory. Confirm from your project piping specification before ordering.
5. What facing — RF or FF for threaded flanges?
Raised Face (RF) is standard for most process and industrial applications. Flat Face (FF) is used when connecting to cast iron equipment (pumps, valves) where the full face gasket distributes bolt load and prevents CI flange cracking. RTJ for Class 600 and above high pressure service.
6. Which material for fire fighting systems?
Carbon Steel A105 threaded flange Class 150 RF is the standard for fire fighting system threaded connections in India. Galvanised finish available for fire fighting systems where specified in project spec.
7. Which material for pharmaceutical and food grade?
A182 F316L (SS316L low carbon) threaded flange for pharmaceutical GMP and food processing — FDA-compliant material, low carbon prevents weld sensitisation in adjacent welded connections.
8. What sizes are available?
½” (DN15) to 24″ (DN600) per ASME B16.5. Note: threaded flanges in large sizes above 4″ are rarely specified — most project engineers specify slip-on or weld neck for 6″ and above.
9. What MTC and test certificates are provided?
Material Test Certificate (MTC) with heat number, chemical composition, and mechanical properties per ASTM A105 / A182. Dimensional inspection records per ASME B16.5 on request.
10. Can I order threaded flanges with stud bolts and gaskets in one order?
Yes — Krishna Industries supplies threaded flanges, stud bolts, heavy hex nuts, and spiral wound gaskets as complete flange joint sets — single GST invoice, single dispatch.
11. What is the MOQ?
MOQ is 10 Nos per line item. Full piping BOM flange packages welcome with consolidated pricing.
12. Do you supply other flange types?
Yes — Slip-On (SORF), Weld Neck (WNRF), Blind, Socket Weld (SWRF), Lap Joint, Orifice, and Long Weld Neck flanges available in all materials and pressure classes.
Conclusion
The Threaded Flange supplied by Krishna Industries (KELOR) is the correct no-weld flanging solution for hazardous areas, fire fighting, instrument connections, and small bore utility piping — available in Carbon Steel A105, SS304 F304, SS316 F316, SS316L F316L, Alloy Steel F11 / F22, Duplex F51, and Mild Steel — ASME B16.5 Class 150 to Class 2500 — NPT, BSPT, BSPP threading — Raised Face, Flat Face, and RTJ facing — ½” to 24″. Sourced from verified Indian manufacturers with ASTM MTC, dimensional inspection certificates, and full GST documentation. Fast PAN India dispatch from Ahmedabad.
For EPC contractors, piping purchase managers, MRO teams, and bulk buyers — contact Krishna Industries (KELOR), your trusted Threaded Flange supplier in Ahmedabad, Gujarat, India. WhatsApp your material grade, size, pressure class, thread type, and quantity for bulk pricing within 2 hours.
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