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Fasteners — OEM manufacturer, Teshi Group

OEM manufacturer ASTM A193 · ASTM A194 · ASTM A320 · ASME B18.31.2 · ASME B18.2.2

Stud Bolts, Nuts & Fasteners Manufacturer in India

Teshi Group is an OEM manufacturer of stud bolts, hex bolts and heavy hex nuts for flanged joints, in ASTM A193 B7, B7M, B16, B8 and B8M with A194 2H, 2HM, 8 and 8M nuts, and A320 L7 for low-temperature service. Fasteners are supplied plain, hot-dip galvanised or PTFE (Xylan) coated, cut to the stud length each flange class requires so every joint ships complete.

Studs are cut to the length each flange size, class and facing needs, so the joint assembles without site modification.

Size rangeM10–M64 · ½"–4"
Material familiesAlloy / SS
Governing standardsASTM A193, ASTM A194
Quote in 24–48 hoursSee specifications

Fasteners — specifications & size ranges

TypeStandardSize rangeCoatingMaterial grades
Stud Bolt (full thread)ASME B18.31.2½"–4" / M12–M64Plain, HDG, PTFEA193 B7, B7M, B16; A320 L7, L7M, L43; A453 Gr 660; A193 B8/B8M Cl 1 & 2; duplex, super duplex, 904L, 254 SMO; Inconel 625/718, Monel 400/K-500, Hastelloy C276, Incoloy 825; titanium Gr 2/5
Heavy Hex NutASME B18.2.2½"–4" / M12–M64Plain, HDG, PTFEA194 2H, 2HM, 3, 7, 7M, 8, 8M, 8T, 8C, 16; A563; duplex, super duplex, 904L, 254 SMO; Inconel, Monel, Hastelloy, Incoloy 825; titanium
Hex BoltASME B18.2.1¼"–2" / M10–M36Plain, HDGA307, A193 B7 / B8 / B8M, SAE J429 Gr 5 / 8, ISO 8.8 / 10.9 / 12.9, A2-70, A4-70 / A4-80; duplex, nickel alloys and titanium on request
Stainless Stud BoltASME B18.31.2½"–2"PlainA193 B8, B8M, B8T, B8C (Cl 1 & 2) with A194 8 / 8M / 8T / 8C; 904L, 254 SMO, duplex, super duplex
Low-temperature StudASTM A320½"–2½"Plain, PTFEA320 L7, L7M, L43 with A194 7 / 7M (S3 impact)

Fasteners types

9 products
OEM manufacturer

Stud Bolts

ASTM A193 · ASTM A320

View productOEM manufacturer

Hex & Heavy Hex Bolts

ASME B18.2.1 · ISO 4014

View productOEM manufacturer

Heavy Hex Nuts

ASTM A194 · ASME B18.2.2

View productOEM manufacturer

Socket Head Cap Screws

ASME B18.3 · ISO 4762

View productOEM manufacturer

Carriage Bolts

ASME B18.5 · DIN 603

View productOEM manufacturer

Square Head Bolts & Square Nuts

ASME B18.2.1 · ASME B18.2.2

View productOEM manufacturer

Coupling Nuts

ASME B18.2.2 · DIN 6334

View productOEM manufacturer

Lock Nuts

ISO 7040 · DIN 985

View productOEM manufacturer

Flat & Spring Washers

ASME B18.22.1 · ASME B18.21.1

View product

Technical data sheets

Stud Bolts & Heavy Hex Nuts data sheetView online · download PDFProduct catalogue (PDF)All 11 categories, specifications and size ranges

Dimensional standards

Stud bolt chart for ASME B16.5 flangesASME B16.5 · view online · download PDF

Material grades

All grades
ASTM A193 B7ASTM A193 B7MASTM A193 B16ASTM A193 B8 Cl.1ASTM A193 B8M Cl.1ASTM A194 2HASTM A194 2HMASTM A194 8ASTM A194 8MASTM A320 L7ASTM A320 L7MASTM A320 L43ASTM A453 Grade 660 Cl.AASTM A194 Grade 7

Complete material range

Carbon steel
ASTM A307 Gr A / B, ASTM A563 nuts, SAE J429 Gr 2 / 5 / 8, ISO 898-1 class 4.6, 5.6, 8.8, 10.9, 12.9; ASTM F3125 (A325, A490)
Alloy steel
ASTM A193 B7, B7M, B16; nuts ASTM A194 2H, 2HM, 3, 7, 7M, 16
Low-temperature
ASTM A320 L7, L7M, L43; nuts ASTM A194 7 / 7M with S3 impact test
High-temperature
ASTM A453 Gr 660 (A286, UNS S66286); ASTM A193 B16
Stainless steel
ASTM A193 / A320 B8, B8M, B8T, B8C (Class 1 and Class 2); nuts ASTM A194 8, 8M, 8T, 8C, 8F; ISO 3506 A2-70, A4-70, A4-80; ASTM F593 / F594
904L and 6Mo
904L (UNS N08904), 254 SMO / 6Mo (UNS S31254)
Duplex and super duplex
Duplex UNS S31803 / S32205 and super duplex UNS S32750 / S32760 (ASTM A1082 bolting, A276 / A479 bar)
Nickel alloys
Monel 400 (ASTM B164, N04400), Monel K-500 (B865, N05500), Inconel 600 (B166, N06600), Inconel 625 (B446, N06625), Inconel 718 (B637, N07718), Incoloy 825 (B425, N08825), Hastelloy C276 (B574, N10276), Alloy 20 (B473, N08020)
Titanium
ASTM B348 Grade 1, 2, 5 (Ti-6Al-4V), 7, 12
Copper-nickel
Cu-Ni 90/10 (C70600) and 70/30 (C71500) against order

Documentation

What you receive with every order

  1. Hard-stamped heat number
  2. EN 10204 3.1 mill test certificate
  3. Dimensional inspection report against the governing standard
  4. Packing list with heat numbers
  5. Third-party inspection on request
  6. Seaworthy wooden cases for export orders

FAQ

Fasteners: common questions

How do I find the stud bolt length for a flange?

Stud length depends on flange class, size and facing. Our stud bolt chart lists the number, diameter and length of studs for every ASME B16.5 raised-face and ring-joint flange from Class 150 to 2500.

Which nut goes with an A193 B7 stud?

ASTM A194 Grade 2H heavy hex nuts are the standard pairing for A193 B7 studs. For B7M studs in sour service, use A194 2HM nuts.

What coatings do you offer?

Plain (black), hot-dip galvanised, zinc plated and PTFE / Xylan fluoropolymer coating for corrosion resistance and easier break-out.

Need a size or grade not listed here?

Our engineering team manufactures against your specific drawing or datasheet, with dimensional sign-off before dispatch.

Send us your specification

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All enquiries are reviewed by a technical engineer, not a generic sales inbox — expect a specification-matched response, not a form reply.

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