Email:
[email protected]
Phone:
+91 93135 43530
Address:
133/1 Ground, Mansuri Block, Opp. Dudheshwar Water Tank, Ahmedabad-380004, Gujarat, India
A194 2H Heavy Hex Nut supplier in Ahmedabad, Gujarat. ASTM A194 Grade 2H — medium carbon steel quenched and tempered — 175 ksi proof load — ASME B18.2.2 heavy hex dimensions (larger AF and bearing face than standard hex nut)…
Hex Nut — ASTM A194 2H
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
A194 2H Heavy Hex Nut Supplier India | ASME B18.2.2 | Plain / HDG / Zinc | All Sizes | Flanged Joint Bolting Class 150–2500 | KELOR
Supplier: Krishna Industries (KELOR) – Ahmedabad, Gujarat, India
Established: 2017 | GSTIN: 24AKLPP6499B1ZT | IEC: AKLPP6499B
MOQ: 100 Nos | Grade: ASTM A194 2H | Standard: ASME B18.2.2
Thread: UNC ASME B1.1 | Finish: Plain / HDG / Zinc | Proof Load: 175 ksi
A194 2H Heavy Hex Nut Supplier in India
Krishna Industries (KELOR), based in Ahmedabad, Gujarat, supplies A194 2H Heavy Hex Nuts — ASTM A194 Grade 2H medium carbon steel quenched and tempered — 175 ksi proof load — ASME B18.2.2 heavy hex dimensions — UNC thread (ASME B1.1) — plain (black) / yellow zinc plated / hot dip galvanised (HDG ASTM A153) — all standard sizes — GST invoice — MOQ 100 Nos — Pan India dispatch from Ahmedabad.
A194 2H is the standard heavy hex nut paired with A193 B7 stud bolts for ASME B16.5 flanged joint bolting on Indian process plant piping — chemical plants, refineries, power plants, CGD networks, and general industrial piping Class 150 to Class 2500. Furthermore, heavy hex dimensions (larger across-flats and bearing face than standard hex) distribute bolt preload evenly over the flange face — a requirement of ASME B16.5 and ASME PCC-1 for pressure boundary flanged joint bolting.
Heavy Hex Nut vs Standard Hex Nut — Why Heavy Hex Is Mandatory for Flange Bolting
Most Indian buyers use the terms interchangeably but they are different products with different dimensions and different applications. Specifying standard hex nut for ASME B16.5 flange bolting is a common error that creates uneven gasket compression and joint leakage.
| Feature | Heavy Hex Nut (A194 2H) | Standard Hex Nut (IS 1363 / DIN 934) |
|---|---|---|
| Across-Flats (AF) | ✅ Larger — e.g. 1″ UNC: 41.3mm AF | Smaller — e.g. 1″ UNC: 38.1mm AF — 8% smaller bearing face |
| Nut Height | ✅ Taller — greater thread engagement — more resistance to stripping at high preload torque | Shorter — less thread engagement — risk of strip at high bolt preload torques required for Class 600+ flanges |
| Bearing Face Area | ✅ Larger — distributes bolt load over more flange face area — prevents local flange face yielding — essential for raised face flanges where the bearing area is the raised ring only | Smaller — concentrates bolt load on smaller area — risk of local flange face deformation at high preload — incorrect for pressure boundary flanged joints |
| ASME B16.5 Compliance | ✅ ASME B16.5 and ASME PCC-1 specify heavy hex nuts for pressure class flanged joint bolting — mandatory for all process plant flanged valve and pipe joints | Not specified in ASME B16.5 for pressure boundary flanged joints — only for structural, non-pressure, and general bolting |
| Proof Load (A194 2H) | ✅ 175 ksi — exceeds A193 B7 yield (105 ksi) — correct pairing per ASME PCC-1 | IS Grade 8: ~116 ksi — marginal. IS Grade 5: ~85 ksi — below B7 yield — nut strips before adequate preload |
| Specify When | ✅ Always — for all ASME B16.5 Class 150–2500 flanged valve, pipe, heat exchanger, and pressure vessel bolting in Indian process plants | Structural steel, equipment base plates, non-pressure mechanical assembly — never for process plant flanged pipe and valve joints |
A194 Grade Selection — Match Nut to Stud Grade
| Stud Bolt Grade | Correct Nut Grade | Material Pair | Service |
|---|---|---|---|
| A193 B7 | ✅ A194 2H (This Page) | Carbon steel / Carbon steel | Standard process plant — -45°C to +450°C — most common Indian specification |
| A193 B8 | A194 Grade 8 | SS304 / SS304 | SS304 flanged joints — mild corrosive service |
| A193 B8M | A194 Grade 8M | SS316 / SS316 | SS316 flanged joints — chloride, chemical, pharma |
| A320 L7 | A194 Grade 4 | Low temp CS / Low temp CS | Cryogenic and low temperature service |
| A193 B16 | A194 Grade 7 | Alloy steel / Alloy steel | High temperature steam above 450°C |
Important: Never mix carbon steel nuts with stainless steel studs or vice versa in wet or outdoor service. Galvanic corrosion between dissimilar metals causes the carbon steel component to corrode preferentially — studs corrode and seize in SS flanges. Always specify matching nut and stud material grades.
Technical Specifications
| Parameter | Specification |
|---|---|
| ASTM Grade | A194 Grade 2H |
| Material | Medium carbon steel — quenched and tempered |
| Proof Load | 175 ksi (1207 MPa) |
| Hardness | C24–C34 Rockwell |
| Nut Type | Heavy hex — per ASME B18.2.2 |
| Thread | UNC coarse thread — ASME B1.1 |
| Size Range | M16 to M48 / ½” to 2″ UNC standard |
| Temperature Range | -45°C to +450°C (matched to A193 B7 service) |
| Finish | Plain (black oxide) / Yellow zinc plated / Hot dip galvanised (HDG) ASTM A153 |
| Certification | Mill test certificate — chemical composition + mechanical properties + hardness |
| Paired With | A193 B7 stud bolt (standard) — see A193 B7 Stud Bolt page |
| MOQ | 100 Nos per size |
| HSN Code | 73182900 |
Common Heavy Hex Nut Dimensions — ASME B18.2.2
| Thread Size | Across Flats (mm) | Nut Height (mm) | Common Flange Application |
|---|---|---|---|
| M16 / ⅝” UNC | 27 / 28.6 | 16 / 17.5 | DN15–DN25 Class 150/300 flanges |
| M20 / ¾” UNC | 32 / 34.9 | 19 / 20.6 | DN40–DN80 Class 150/300 flanges |
| M24 / 1″ UNC | 36 / 41.3 | 22 / 26.2 | DN100–DN150 Class 150/300 flanges |
| M27 / 1⅛” UNC | 41 / 47.6 | 24 / 29.4 | DN200 Class 150/300 flanges |
| M30 / 1¼” UNC | 46 / 50.8 | 26 / 31.8 | DN250 Class 150 / DN150 Class 600 |
| M36 / 1½” UNC | 55 / 57.2 | 31 / 36.5 | DN300 Class 150 / DN200 Class 600 |
Applications in Indian Industries
Process Plant Flanged Joint Bolting
A194 2H heavy hex nut — plain or zinc plated — all ASME B16.5 flange sizes Class 150 to 2500. Standard nut for every carbon steel flanged joint on Indian process plant piping — chemical plants, refineries, CGD networks, power plants. Furthermore, nuts are supplied with A193 B7 stud bolts as a matched set per ASME B16.5 Table requirements. Separate nut supply for replacement of corroded or damaged nuts on existing installations.
Pressure Vessel and Heat Exchanger Bolting
A194 2H heavy hex nut for ASME VIII Div 1 pressure vessel flange bolting — shell and channel flanges, manhole covers, nozzle flanges. MTC mandatory per ASME VIII UG-10. Moreover, 3.1 MTC standard — 3.2 MTC (third party witnessed) available on request for critical pressure boundary applications.
Outdoor and Coastal — HDG Finish
A194 2H hot dip galvanised (HDG ASTM A153) — outdoor pipe racks, water treatment plants, cooling water flanges, coastal industrial piping. HDG nuts resist corrosion significantly longer than plain nuts in outdoor Indian conditions. In addition, HDG nuts do not seize on HDG studs during maintenance — reducing maintenance time and eliminating the need for angle grinder nut removal on corroded flanges.
Related Products — Krishna Industries (KELOR)
- A193 B7 Stud Bolt with A194 2H Nut — complete B7/2H set — most common Indian process plant flanged joint bolting specification
- Stud Bolt — Multiple Grades — A193 B7, B8, B8M — full stud bolt range
- Hex Bolt — for structural and non-pressure bolting where standard hex bolt is the correct specification
- Double Ended Stud — equipment and machinery mounting studs
- Full Threaded Stud — full thread stud for general industrial fastening
Frequently Asked Questions
1. What is the difference between A194 2H and A194 2HM?
A194 Grade 2H is carbon steel — quenched and tempered — 175 ksi proof load — for use with A193 B7 carbon steel stud bolts. A194 Grade 2HM is the same material but with restricted hardness range (C24–C30) — specified for sour gas service (H2S-containing environments) per NACE MR0175 / ISO 15156, which limits hardness to prevent hydrogen-induced cracking. Specify 2HM instead of 2H when the project specification calls for NACE compliance — sour gas pipelines, offshore, and sour service refinery piping.
2. Can I use A194 2H nuts with SS304 or SS316 stud bolts?
No — A194 2H is a carbon steel nut. Pairing it with SS304 (A193 B8) or SS316 (A193 B8M) stud bolts creates a galvanic couple in wet or outdoor service — the carbon steel nut corrodes preferentially and seizes on the SS stud, making removal impossible without cutting. Always match nut material to stud material — A194 Grade 8 nut with A193 B8 stud, A194 Grade 8M nut with A193 B8M stud.
3. How many nuts per stud bolt in a flanged joint?
Two nuts per stud bolt — one at each end. A stud bolt spans both flanges with a nut bearing on each flange face. The ASME B16.5 Table specifies the number of stud bolts per flange size and pressure class — multiply by 2 for total nut quantity. For example, a DN100 Class 150 flange has 8 stud bolts — 16 nuts required for the joint (8 stud bolts × 2 nuts).
4. What MTC is provided?
Every order includes MTC confirming ASTM A194 Grade 2H — chemical composition, mechanical properties (proof load test), and hardness (Rockwell C) — with heat number traceability. This MTC is required for EPC project QA documentation and pressure vessel bolting per ASME VIII UG-10. Specify “MTC required” at order stage.
5. What is the MOQ?
MOQ is 100 Nos per size per finish. WhatsApp thread size (metric M__ or inch UNC), finish (plain / zinc / HDG), and quantity for pricing within 2 hours. Stud bolt and nut together as a matched B7/2H set — see the A193 B7 Stud Bolt page for combined set pricing.
Conclusion
Krishna Industries (KELOR) supplies A194 2H Heavy Hex Nuts — ASTM A194 Grade 2H medium carbon steel — 175 ksi proof load — ASME B18.2.2 heavy hex dimensions — UNC thread — plain / yellow zinc / hot dip galvanised (HDG ASTM A153) — all standard sizes — MTC — GST invoice — MOQ 100 Nos — Pan India dispatch from Ahmedabad. Supplied individually or as a matched B7/2H set with A193 B7 stud bolts. WhatsApp thread size, finish, and quantity for pricing within 2 hours.
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