Heavy Hex Bolt

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Heavy Hex Bolts are robust, high-strength fasteners distinguished by a wider and thicker head compared to standard hex bolts, offering superior load distribution and torque capability for the most demanding applications. Engineered for structural integrity in heavy construction, high-temperature valves, and petrochemical processing, these bolts meet rigorous standards such as ASME B18.2.1 and ASTM A193. At Inconel Fasteners, we specialize in manufacturing premium Heavy Hex Bolts in high-performance alloys including Inconel 600, 625, 718, and Hastelloy. Our products are designed to deliver unmatched reliability, corrosion resistance, and longevity in extreme environments where failure is not an option.

Detailed Specifications

Size
M4 to M180 Metric 1/4” to 8″ Imperial
Length
Up to 6000mm
Type of Threads
Metric Coarse Metric Fine UNC UNF 8UN BSW
Threads Configuration
ASME B1.1 2A/3A ISO 261 ISO 965
Type of Manufacturing
Hot Forging Machined Bars Milling Bars
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
Plain / Oil Black Zinc Plated Hot Dip Galvanized (HDG) Cadmium Nickel Chrome PTFE / Teflon Xylan
Marking
Manufacturer Logo Grade ID Size Heat Number (Traceability)
Heat Treatment Details
Quenching & Tempering Solution Annealing Stress Relieving Normalizing
Delivery Terms
Ex-Works (EXW) FOB CIF CFR DDP
Packing Type
Carton Boxes Wooden Pallets Wooden Crates Custom Bundles
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 API 6A
Additional Certifications
NABL Approved Lab Reports Third Party Inspection (TPI) ISO 14001
Mandatory & Additional Requirements
Positive Material Identification (PMI) NACE MR0175 / ISO 15156 Ultrasonic Test (UT) Impact Testing (Charpy V-Notch)

Available Inconel Grades & Standards

Dimensions Chart (ASME B18.2.1 - Heavy Hex Bolt)

Nominal Size (D) Width Across Flats (F)
(Basic)		 Width Across Corners (G)
(Max)		 Head Height (H)
(Basic)		 Thread Length (L ≤ 6")
(Standard)
1/2" 7/8" 1.010" 11/32" 1.25"
5/8" 1-1/16" 1.227" 27/64" 1.50"
3/4" 1-1/4" 1.443" 1/2" 1.75"
7/8" 1-7/16" 1.660" 37/64" 2.00"
1" 1-5/8" 1.876" 43/64" 2.25"
1-1/8" 1-13/16" 2.093" 3/4" 2.50"
1-1/4" 2" 2.309" 27/32" 2.75"
1-3/8" 2-3/16" 2.526" 29/32" 3.00"
1-1/2" 2-3/8" 2.742" 1" 3.25"
1-3/4" 2-3/4" 3.175" 1-5/32" 3.75"
2" 3-1/8" 3.608" 1-11/32" 4.25"

Chemical Composition (Inconel Grades)

Grade Ni (Nickel) Cr (Chromium) Fe (Iron) Mo (Molybdenum) Nb (Niobium) Co (Cobalt) Other Elements
Inconel 600 72.0% Min 14.0 - 17.0% 6.0 - 10.0% - - - Mn 1.0%, C 0.15%
Inconel 601 58.0 - 63.0% 21.0 - 25.0% Balance - - - Al 1.0 - 1.7%
Inconel 625 58.0% Min 20.0 - 23.0% 5.0% Max 8.0 - 10.0% 3.15 - 4.15% 1.0% Max Ti 0.4%, Al 0.4%
Inconel 718 50.0 - 55.0% 17.0 - 21.0% Balance 2.8 - 3.3% 4.75 - 5.5% 1.0% Max Ti 0.65 - 1.15%
Inconel X-750 70.0% Min 14.0 - 17.0% 5.0 - 9.0% - 0.7 - 1.2% 1.0% Max Ti 2.25 - 2.75%, Al 0.4 - 1.0%
Inconel 800 30.0 - 35.0% 19.0 - 23.0% 39.5% Min - - - Al 0.15 - 0.60%, Ti 0.15 - 0.60%
Inconel 825 38.0 - 46.0% 19.5 - 23.5% 22.0% Min 2.5 - 3.5% - - Cu 1.5 - 3.0%, Ti 0.6 - 1.2%

Mechanical Properties (Inconel Heavy Hex Bolts)

Grade Tensile Strength
(MPa / N/mm²) Min		 Yield Strength
(MPa / N/mm²) Min		 Elongation
(%) Min		 Hardness
(HRC / HB)
Inconel 600 550 240 30% 65 - 85 HRB
Inconel 601 550 205 30% 60 - 80 HRB
Inconel 625 827 414 30% 145 - 220 HB
Inconel 718 1275 1035 12% 36 - 44 HRC
Inconel X-750 1100 700 15% 30 - 40 HRC
Inconel 800 520 205 30% 75 HRB (Max)
Inconel 825 586 241 30% 135 - 165 HB
Inconel 925 1103 758 20% 26 - 36 HRC

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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