Stud bolts and heavy hex nuts manufacturer in India, from B7/2H to super duplex and titanium
Flange bolting made to ASME B18.2.1, B18.2.2 and B1.1 in alloy, low-temperature, stainless and exotic grades. Supplied alone or as complete joint sets with Teshi flanges.
- Since 1971manufacturing in India
- ISO 9001:2015certified
- IBRapproved
- Carbon steel to titaniumone supplier for the full grade range
What we make
Stud bolts
Fully threaded and double-ended studs for flange, valve and equipment joints, in inch and metric sizes.
DetailsHeavy hex nuts
ASTM A194 heavy hex nuts, plain or coated, matched to the stud grade.
DetailsGrades
B7, B7M, B16, L7, B8, B8M, and exotic grades from 904L to titanium and nickel alloys.
Details
Also made to drawing: anchor and foundation bolts, hex bolts, U-bolts, washers and jack screws.
Work out a bolt set
Studs and heavy hex nuts for any number of ASME B16.5 flange joints.
Bolt set finder
Studs and nuts for a number of ASME B16.5 flange joints.
Two heavy hex nuts per stud. Stud length depends on facing and gasket, so send those with your enquiry.
Grades at a glance
| Material | Stud | Nut | Min tensile / yield, MPa | Typical use |
|---|---|---|---|---|
| Alloy steel | ASTM A193 B7 | ASTM A194 2H | 860 / 720 (up to 2½ in) | General refinery and plant flange bolting |
| Alloy steel, sour service | ASTM A193 B7M | ASTM A194 2HM | 690 / 550 | NACE MR0175, hardness 235 HB max |
| Cr-Mo-V, high temperature | ASTM A193 B16 | ASTM A194 4 / 7 | 860 / 725 (up to 2½ in) | Steam and hot service |
| Low temperature | ASTM A320 L7, L7M, L43 | ASTM A194 7 / 7M | 860 / 725 (L7) | Impact tested to -101°C (L7) |
| Stainless 304 / 316 | ASTM A193 B8, B8M Cl.1 and Cl.2 | ASTM A194 8, 8M | 515 / 205 (Cl.1) | Strain-hardened Cl.2 for higher strength |
How every order is checked
We are certified to ISO 9001:2015 and approved under IBR. The same four checks apply to every order, whether it is a dozen flanges or a full project BOQ.
Raw material check
Mill certificates are checked against the purchase order, and heat numbers are logged when material arrives.
Traceable processing
Heat numbers carry through cutting, forging or forming, machining and welding, so every piece links back to its mill certificate.
Testing and inspection
Dimensional checks, PMI and the NDT your QAP calls for. Third-party inspection is arranged when you specify an agency.
Documents with dispatch
Material test certificates to EN 10204 3.1, or 3.2 when witnessed, with the inspection reports your contract asks for.
Mechanical testing, hardness, proof load and impact tests are carried out per the grade specification, with results on the test certificate.
Who we supply
Steel plants, non-ferrous smelters, shipyards and the EPC contractors who build for them. Most of our work is repeat business from these buyers.
- AM/NS IndiaHazira blast furnace packages
- Tata SteelSteel plant piping and flanges
- JSW SteelSteel plant piping and flanges
- SAILSteel plant supplies
- Jindal SteelDomestic and export flange orders
- Hindustan ZincDebari, Chanderiya and Kansariguda projects
- Utkal AluminaProcess plant supplies
- Larsen & ToubroEPC packages across metals and mining
- Lloyds Engineering WorksCarbon steel forged flanges
- Cochin ShipyardMarine piping components
- Summits HygronicsProcess equipment components
The rest of your package from Teshi Group
Flanges, fittings, pipe, bolting and fabrication can go on one purchase order, with one set of documents.
Questions buyers ask
Do you manufacture stud bolts?
Yes. Teshi Group manufactures stud bolts, heavy hex nuts and other industrial fasteners in India, and supplies them with our flanges as complete joint sets.
Which thread do flange stud bolts use?
Inch studs up to 1 inch use the UNC coarse series. From 1⅛ inch and above, ASME B16.5 flange bolting uses the 8 UN series (8 threads per inch).
What coatings can you supply?
Plain, hot-dip galvanised, zinc-nickel, and PTFE (Xylan-type) fluoropolymer coatings, among others. State the coating and colour in your enquiry.
Can you supply bolting for exotic-grade flanges?
Yes. We supply 904L, 254 SMO, duplex, super duplex, titanium and nickel-alloy bolting to match the flange grade.
Send us your BOQ
Tell us the grades, standards, sizes and quantities. Our estimation team replies from info@teshigroup.com, usually within one working day for standard items.
Drawings, BOQ spreadsheets and QAPs are easiest by email. Attach them to a message to info@teshigroup.com and mention your project name.