Stud Bolt

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Stud Bolts are the primary fastening solution for high-pressure ANSI flanges and piping connections in the oil, gas, and petrochemical industries. Unlike standard machine bolts, stud bolts are fully threaded rods secured with two heavy hex nuts, allowing for simultaneous tensioning from both ends to ensure a uniform gasket seal. Critical for safety in high-temperature refineries and subsea pipelines, our Inconel Stud Bolts are manufactured to meet ASME B18.31.2 and ASTM A453 standards. At Inconel Fasteners, we specialize in rolling threads on superalloys like Inconel 718, 625, and Incoloy 825 after heat treatment. This "rolled-after-heat-treat" process significantly increases fatigue life, ensuring our studs resist shearing and elongation even under extreme thermal cycling and corrosive attack.

Detailed Specifications

Size Range
M6 to M100 Metric 1/4” to 4″ Imperial
Length
Custom Cut to Length Standard ANSI Lengths Up to 6 Meters
Type of Threads
UNC (Coarse) 8UN (Standard for >1") UNF (Fine) Metric Coarse ACME (Trapezoidal)
Threads Configuration
ASME B1.1 Class 2A ISO 261 (6g Tolerance) Rolled Threads (High Strength)
End Configuration (Points)
Chamfered Both Ends Flat Faced Rounded Ends Saw Cut (Rough)
Type of Manufacturing
Thread Rolling (Preferred) Cut Threads (Lathe) Centerless Grinding
Raw Material Origin
Indian Origin European Origin Japanese Origin US Origin Korean Origin
Finish Part Origin
Made in India Custom Origin per Request
Surface Coating
PTFE / Xylan (Common for Studs) Zinc Nickel Cadmium Moly Coating Plain / Oil Black
Marking
Grade ID Stamped on Ends Manufacturer Logo Heat Code
Heat Treatment Details
Solution Annealing Age Hardening Double Aging (For 718)
Delivery Terms
Ex-Works (EXW) FOB CIF CFR DDP
Packing Type
Bundles with End Caps Wooden Crates Plastic Sleeve Mesh
Payment Methods
L/C (Letter of Credit) T/T (Wire Transfer) Western Union
Certifications
ISO 9001:2015 PED 2014/68/EU MTC EN 10204 3.1
Additional Certifications
NABL Approved Lab Reports Ultrasonic Test (UT) Charpy Impact Test
Mandatory & Additional Requirements
Positive Material Identification (PMI) Tensile Testing (Full Size) Hardness Testing

Available Inconel Grades & Standards

Dimensions Chart (Stud Bolts - ASME B16.5 / B1.1)

Nominal Size
(Dia)		 Threads Per Inch
(UNC / 8UN)		 Standard Lengths
(Min)		 Point Style
1/2" 13 UNC 30mm - 3000mm Chamfered
5/8" 11 UNC 35mm - 3000mm Chamfered
3/4" 10 UNC 40mm - 3000mm Chamfered
7/8" 9 UNC 50mm - 3000mm Chamfered
1" 8 UNC 50mm - 3000mm Chamfered
1-1/8" 8 UN 60mm - 3000mm Chamfered
1-1/4" 8 UN 65mm - 3000mm Chamfered
1-3/8" 8 UN 70mm - 3000mm Chamfered
1-1/2" 8 UN 75mm - 3000mm Chamfered
2" 8 UN 100mm - 3000mm Chamfered

Chemical Composition (Standard Grades)

Grade Ni (Nickel) Cr (Chromium) Fe (Iron) Mo (Molybdenum) Nb (Niobium) Ti (Titanium) Other Elements
Inconel A286 (Gr. 660) 24.0 - 27.0% 13.5 - 16.0% Balance 1.0 - 1.5% - 1.9 - 2.35% V 0.1 - 0.5%
Inconel 718 50.0 - 55.0% 17.0 - 21.0% Balance 2.8 - 3.3% 4.75 - 5.5% 0.65 - 1.15% Al 0.2 - 0.8%
Inconel X-750 70.0% Min 14.0 - 17.0% 5.0 - 9.0% - 0.7 - 1.2% 2.25 - 2.75% Al 0.4 - 1.0%
Inconel 625 58.0% Min 20.0 - 23.0% 5.0% Max 8.0 - 10.0% 3.15 - 4.15% 0.4% Max Al 0.4% Max
Inconel 825 38.0 - 46.0% 19.5 - 23.5% 22.0% Min 2.5 - 3.5% - 0.6 - 1.2% Cu 1.5 - 3.0%

Mechanical Properties (Stud Bolts)

Grade Tensile Strength
(MPa) Min		 Yield Strength
(0.2% Offset) Min		 Elongation
(%) Min		 Hardness
(HRC / HB)
Inconel A286 (Gr. 660) 895 - 1000 585 - 750 15% 24 - 35 HRC
Inconel 718 1275 1035 12% 36 - 44 HRC
Inconel X-750 1100 700 15% 30 - 40 HRC
Inconel 625 827 414 30% 145 - 220 HB
Inconel 825 586 241 30% 135 - 165 HB

DIN Standards for Bolts

Comprehensive list of dimensional standards for industrial fasteners.

Series 100 - 900
  • DIN 186
  • DIN 188
  • DIN 261
  • DIN 444
  • DIN 479
  • DIN 580
  • DIN 601
  • DIN 603
  • DIN 604
  • DIN 605
  • DIN 610
  • DIN 787
  • DIN 797
  • DIN 931
  • DIN 933
  • DIN 933 SZ
Nuts & Precision
  • DIN 431
  • DIN 439 A/B
  • DIN 466
  • DIN 467
  • DIN 508
  • DIN 547
  • DIN 548
  • DIN 555
  • DIN 557
  • DIN 562
  • DIN 582
  • DIN 798
  • DIN 917
  • DIN 934
  • DIN 935
  • DIN 936
  • DIN 937
Studs & Washers
  • DIN 525
  • DIN 835
  • DIN 938
  • DIN 939
  • DIN 940
  • DIN 976
  • DIN 125 A/B
  • DIN 126
  • DIN 127 A/B
  • DIN 433
  • DIN 440 R/V
  • DIN 6796
  • DIN 7980
  • DIN 9021
Extended & Heavy Series
DIN 3570
DIN 7968
DIN 7969
DIN 7990
DIN 7992
DIN 70613
DIN 70614
DIN 80705
DIN 6331
DIN 6334
DIN 6915
DIN 6924
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