Call Us : +91-9022702227 info@aanuraj.com
Hex Bolts — Stainless Steel, Duplex, Super Duplex & Hastelloy | Aanuraj
Aanuraj exotic grade threaded fasteners — @Aanuraj
Technical Fastener Engineering

HEX BOLTS IN STAINLESS STEEL & EXOTIC GRADES

Technical reference for Aanuraj hot-forged Hex Bolts manufactured in stainless steel, Duplex, Super Duplex and Hastelloy grades for demanding industrial applications.

BUY HEX BOLTS ONLINE ↗ WHATSAPP ENQUIRY DOWNLOAD TECHNICAL DATA PDF

Our Grade & Material Expertise

Aanuraj's Hex Bolt range covers conventional stainless grades through high-alloy and nickel-based fastener materials. Material grade, fastener specification, heat treatment and inspection requirements should be agreed against the purchase order and applicable standard.

Stainless Steel304, 316, 316L, 310/310S, 317L, 321, 347, 904L
Super Austenitic254 SMO / UNS S31254 for highly corrosive environments
Duplex2205 / UNS S31803 & S32205
Super Duplex2507 / UNS S32750
HastelloyC-22 / N06022 and C-276 / N10276
ManufacturingHot forging, machining and precision thread processing as applicable
InspectionChemical, mechanical, dimensional and PMI documentation according to order requirements
TraceabilityGrade identification and material certification can be supplied as specified
Technical distinction: ASTM fastener specifications such as A193, F593 and A1082/A1082M define fastener requirements for their applicable grades/conditions. The material-property values below are reference wrought-material data and must not be substituted for the mechanical acceptance criteria of the ordered bolt specification.

Hex Bolt Dimension Standards — Metric & Inch

Technical comparison of hex-head dimensions. Metric sizes are compared across DIN, ISO and the applicable ASME metric reference; inch sizes use ASME B18.2.1. Always specify the governing standard on the purchase order.

SizePitch P (mm)DIN 931 / DIN 933ISO 4014 / ISO 4017ASME B18.2.3.1M*
s AFe minks AFe minks AFe maxk
M121.751921.107.51820.037.51820.787.76
M142.02224.498.82123.368.82124.259.09
M162.02426.7510.02426.7510.02427.7110.32
M182.52730.1411.52730.1411.5———
M202.53033.5312.53033.5312.53034.6412.88
M222.53235.7214.03437.7214.0———
M243.03639.9815.03639.9815.03641.5715.44
M273.04145.2017.04145.2017.0———
M303.54650.8518.74650.8518.74653.1219.48
M333.55055.3721.05055.3721.0———
M364.05560.7922.55560.7922.55563.5123.38
M394.06066.4425.06066.4425.0———
M424.56571.3026.06571.3026.06575.0626.97
Important: DIN 931/933 and ISO 4014/4017 are not dimensionally identical at every size. Notable across-flats differences occur at M10, M12, M14 and M22. ASME B18.2.3.1M is maintained for historical reference by ASME and does not list every DIN/ISO nominal size shown here. citeturn3search2turn4search2
Nominal sizeBody dia. max (in)Across flats F (in)Across corners G max (in)Head height H basic (in)Thread length ≤6 in (in)Thread length >6 in (in)
1/20.5153/40.86611/321.2501.500
5/80.64215/161.08327/641.5001.750
3/40.7681-1/81.2991/21.7502.000
7/80.8951-5/161.51637/642.0002.250
11.0221-1/21.73243/642.2502.500
1-1/81.1491-11/161.9493/42.5002.750
1-1/41.2771-7/82.16527/322.7503.000
1-3/81.4042-1/162.38229/323.0003.250
1-1/21.5312-1/42.59813.2503.500
1-3/41.7852-5/83.0311-5/323.7504.000
22.03933.4641-11/324.0004.250
Inch note: ASME B18.2.1 covers inch-series square and hex bolts and screws; heavy-hex products are a different dimensional series. citeturn0search8

Chemical & Mechanical Properties — Grade Comparison

Reference values at approximately room temperature. Chemistry is shown as representative/nominal or limiting composition from the cited material references; mechanical values are reference wrought-material values and can vary with product form, size, condition and specification.

Grade / UNSChemical composition — key elementsMechanical referenceSolution annealing / coolingRelevant specification route
SS 304
S30400		C ≤0.08; Cr 18–20; Ni 8–11; Mn ≤2.0; Si ≤1.0; P ≤0.045; S ≤0.030Rp0.2 ≥205 MPa; Rm 515–680 MPa; A ≥45%1040–1100°C; rapid cooling in air or waterASTM A193 B8 / ASTM F593 Group 1 (depending on ordered condition)
SS 316
S31600		C ≤0.08; Cr 16–18; Ni 10–14; Mo 2–3; Mn ≤2.0; Si ≤1.0Rp0.2 ≥205 MPa; Rm 515–690 MPa; A ≥40%1040–1100°C; rapid cooling in air or waterASTM A193 B8M / ASTM F593 Group 2 (depending on ordered condition)
SS 316L
S31603		C ≤0.030; Cr 16–18; Ni 10–15; Mo 2–3; Mn ≤2.0; Si ≤1.0Rp0.2 ≥205 MPa; Rm 515–690 MPa; A ≥40%1040–1100°C; rapid cooling in air or waterASTM F593 Group 2; ASTM A193 B8M may apply when ordered to that specification
SS 310 / 310S
S31000 / S31008		C ≤0.25; Cr 24–26; Ni 19–22; Mn ≤2.0; Si ≤1.5; P ≤0.045; S ≤0.030Reference annealed material: typically Rp0.2 ≈205 MPa; Rm ≈515 MPa; A ≈40%Approx. 1040–1120°C; rapid cooling. Exact treatment to ordered material specificationASTM A240/A276/A479 material grades; finished fastener specification must be separately agreed
SS 317L
S31703		C ≤0.030; Cr 18–20; Ni 11–15; Mo 3–4; Mn ≤2.0; Si ≤1.0Reference bar: Rp0.2 typically ≥205 MPa; Rm typically ≈515 MPa; A ≈40%1120–1160°C; rapid cooling; water cooling commonly used for thicker sectionsASTM A276/A479/A314 material routes; fastener specification to be agreed
SS 321
S32100		C ≤0.08; Cr 17–19; Ni 9–12; Ti ≥5×C (stabilized grade)Reference annealed material: Rp0.2 ≥210 MPa; Rm ≥550 MPa; A ≥40%1040–1100°C; rapid cooling in air or waterASTM F593 Group 3 for suitable fastener forms; material standards also include ASTM A276/A479
SS 347
S34700		C ≤0.08; Cr 17–19; Ni 9–13; Nb stabilized (typically Nb ≥10×C)Reference annealed material: typically Rp0.2 ≈205 MPa; Rm ≈515 MPa; A ≈40%Approx. 1040–1120°C; rapid cooling; exact treatment per material specificationASTM F593 Group 3 for suitable fastener forms; ASTM A276/A479 material routes
SS 904L
N08904		C ≤0.020; Cr ≈20; Ni ≈25; Mo ≈4.5; Cu ≈1.5Reference solution-annealed material: Rp0.2 ≥230 MPa; Rm 520–720 MPa; A ≥35%1060–1140°C; rapid cooling, normally water for relevant sectionsASTM/UNS 904L material; finished fastener specification must be agreed
254 SMO
S31254		C ≤0.020; Cr ≈20; Ni ≈18; Mo ≈6.1; N ≈0.20; Cu ≈0.7Reference solution-annealed material: Rp0.2 typically ≥300 MPa; Rm typically ≥650 MPa; A typically ≥35%1150–1200°C; water quench for sections >2 mm; thin sections may use rapid air/water per product guidanceUNS S31254; material standards vary by product form; fastener specification to be agreed
Duplex 2205
S31803 / S32205		C ≤0.030; Cr 22–23; Ni 4.5–6.5; Mo 3.0–3.5; N 0.14–0.20; Mn ≤2.0Rp0.2 ≥450 MPa; Rm 660–860 MPa; A ≥25%; HB ≤2701020–1100°C; rapid water quenchASTM A1082/A1082M for applicable duplex bolting; ASTM A479/A276/A182 are material/product-form references
Super Duplex 2507
S32750		C ≤0.030; Cr ≈25; Ni ≈7; Mo ≈4; N ≈0.30; Mn ≤1.2; Si ≤0.8Rp0.2 ≥550 MPa; Rm 760–930 MPa; A ≥25%1050–1125°C; rapid quench, normally waterASTM A1082/A1082M for applicable duplex bolting; ASTM A479/A182 material references
Hastelloy C-22
N06022		Ni balance; Cr ≈22; Mo ≈13; W ≈3; Fe ≈3; C ≤0.015; V ≈0.3Haynes wrought reference: 0.2% YS ≈407 MPa; UTS ≈800 MPa; A ≈57%1121°C (2050°F); hold 10–30 min by section; water quench advisedASTM B574/B574M material route; finished fastener specification must be agreed
Hastelloy C-276
N10276		Ni balance; Cr ≈16; Mo ≈16; W ≈4; Fe ≈5; C ≤0.01; V ≈0.35Haynes wrought reference: 0.2% YS ≈356 MPa; UTS ≈792 MPa; A ≈61%1121°C (2050°F); hold 10–30 min by section; water quench advisedASTM B574/B574M material route; finished fastener specification must be agreed

Solution Annealing & Quenching — Technical Guide

SS 304
S30400 · Austenitic Stainless Steel
ChemistryC ≤0.08; Cr 18–20; Ni 8–11; Mn ≤2.0; Si ≤1.0; P ≤0.045; S ≤0.030
MechanicalRp0.2 ≥205 MPa; Rm 515–680 MPa; A ≥45%
Solution anneal1040–1100°C; rapid cooling in air or water
ASTM A193 B8 / ASTM F593 Group 1 (depending on ordered condition)
SS 316
S31600 · Austenitic Stainless Steel
ChemistryC ≤0.08; Cr 16–18; Ni 10–14; Mo 2–3; Mn ≤2.0; Si ≤1.0
MechanicalRp0.2 ≥205 MPa; Rm 515–690 MPa; A ≥40%
Solution anneal1040–1100°C; rapid cooling in air or water
ASTM A193 B8M / ASTM F593 Group 2 (depending on ordered condition)
SS 316L
S31603 · Low-Carbon Austenitic
ChemistryC ≤0.030; Cr 16–18; Ni 10–15; Mo 2–3; Mn ≤2.0; Si ≤1.0
MechanicalRp0.2 ≥205 MPa; Rm 515–690 MPa; A ≥40%
Solution anneal1040–1100°C; rapid cooling in air or water
ASTM F593 Group 2; ASTM A193 B8M may apply when ordered to that specification
SS 310 / 310S
S31000 / S31008 · High-Temperature Austenitic
ChemistryC ≤0.25; Cr 24–26; Ni 19–22; Mn ≤2.0; Si ≤1.5; P ≤0.045; S ≤0.030
MechanicalReference annealed material: typically Rp0.2 ≈205 MPa; Rm ≈515 MPa; A ≈40%
Solution annealApprox. 1040–1120°C; rapid cooling. Exact treatment to ordered material specification
ASTM A240/A276/A479 material grades; finished fastener specification must be separately agreed
SS 317L
S31703 · Mo-Alloyed Austenitic
ChemistryC ≤0.030; Cr 18–20; Ni 11–15; Mo 3–4; Mn ≤2.0; Si ≤1.0
MechanicalReference bar: Rp0.2 typically ≥205 MPa; Rm typically ≈515 MPa; A ≈40%
Solution anneal1120–1160°C; rapid cooling; water cooling commonly used for thicker sections
ASTM A276/A479/A314 material routes; fastener specification to be agreed
SS 321
S32100 · Titanium-Stabilized Austenitic
ChemistryC ≤0.08; Cr 17–19; Ni 9–12; Ti ≥5×C (stabilized grade)
MechanicalReference annealed material: Rp0.2 ≥210 MPa; Rm ≥550 MPa; A ≥40%
Solution anneal1040–1100°C; rapid cooling in air or water
ASTM F593 Group 3 for suitable fastener forms; material standards also include ASTM A276/A479
SS 347
S34700 · Niobium-Stabilized Austenitic
ChemistryC ≤0.08; Cr 17–19; Ni 9–13; Nb stabilized (typically Nb ≥10×C)
MechanicalReference annealed material: typically Rp0.2 ≈205 MPa; Rm ≈515 MPa; A ≈40%
Solution annealApprox. 1040–1120°C; rapid cooling; exact treatment per material specification
ASTM F593 Group 3 for suitable fastener forms; ASTM A276/A479 material routes
SS 904L
N08904 · High-Alloy Austenitic
ChemistryC ≤0.020; Cr ≈20; Ni ≈25; Mo ≈4.5; Cu ≈1.5
MechanicalReference solution-annealed material: Rp0.2 ≥230 MPa; Rm 520–720 MPa; A ≥35%
Solution anneal1060–1140°C; rapid cooling, normally water for relevant sections
ASTM/UNS 904L material; finished fastener specification must be agreed
254 SMO
S31254 · 6Mo Super-Austenitic Stainless Steel
ChemistryC ≤0.020; Cr ≈20; Ni ≈18; Mo ≈6.1; N ≈0.20; Cu ≈0.7
MechanicalReference solution-annealed material: Rp0.2 typically ≥300 MPa; Rm typically ≥650 MPa; A typically ≥35%
Solution anneal1150–1200°C; water quench for sections >2 mm; thin sections may use rapid air/water per product guidance
UNS S31254; material standards vary by product form; fastener specification to be agreed
Duplex 2205
S31803 / S32205 · Duplex Austenitic-Ferritic
ChemistryC ≤0.030; Cr 22–23; Ni 4.5–6.5; Mo 3.0–3.5; N 0.14–0.20; Mn ≤2.0
MechanicalRp0.2 ≥450 MPa; Rm 660–860 MPa; A ≥25%; HB ≤270
Solution anneal1020–1100°C; rapid water quench
ASTM A1082/A1082M for applicable duplex bolting; ASTM A479/A276/A182 are material/product-form references
Super Duplex 2507
S32750 · Super Duplex Austenitic-Ferritic
ChemistryC ≤0.030; Cr ≈25; Ni ≈7; Mo ≈4; N ≈0.30; Mn ≤1.2; Si ≤0.8
MechanicalRp0.2 ≥550 MPa; Rm 760–930 MPa; A ≥25%
Solution anneal1050–1125°C; rapid quench, normally water
ASTM A1082/A1082M for applicable duplex bolting; ASTM A479/A182 material references
Hastelloy C-22
N06022 · Nickel-Chromium-Molybdenum Alloy
ChemistryNi balance; Cr ≈22; Mo ≈13; W ≈3; Fe ≈3; C ≤0.015; V ≈0.3
MechanicalHaynes wrought reference: 0.2% YS ≈407 MPa; UTS ≈800 MPa; A ≈57%
Solution anneal1121°C (2050°F); hold 10–30 min by section; water quench advised
ASTM B574/B574M material route; finished fastener specification must be agreed
Hastelloy C-276
N10276 · Nickel-Chromium-Molybdenum Alloy
ChemistryNi balance; Cr ≈16; Mo ≈16; W ≈4; Fe ≈5; C ≤0.01; V ≈0.35
MechanicalHaynes wrought reference: 0.2% YS ≈356 MPa; UTS ≈792 MPa; A ≈61%
Solution anneal1121°C (2050°F); hold 10–30 min by section; water quench advised
ASTM B574/B574M material route; finished fastener specification must be agreed
Heat-treatment warning: Temperature alone does not define a compliant heat treatment. Soak/holding time, section size, furnace uniformity, atmosphere, transfer time and cooling method all affect the result. For duplex and super-duplex grades, rapid cooling is especially important to control deleterious phases and maintain the required austenite/ferrite balance. The final treatment should follow the ordered material/fastener specification and approved process.

Standards & Fastener Specification

  • DIN 931 / ISO 4014: metric hex head bolts, partially threaded forms.
  • DIN 933 / ISO 4017: metric fully threaded hex screw/bolt forms.
  • ASME B18.2.1: inch-series square and hex bolts/screws.
  • ASTM A193/A193M: alloy and stainless steel bolting for high-temperature/high-pressure and special-purpose applications.
  • ASTM F593: stainless steel bolts, hex cap screws and studs in specified alloy groups/conditions.
  • ASTM A1082/A1082M: high-strength precipitation-hardening and duplex stainless steel bolting for special-purpose applications.
  • Hastelloy C22/C276: nickel-alloy material routes include ASTM B574/B574M for rod/bar; the finished fastener specification should be agreed separately.

Engineering Documentation

For critical orders, specify:

  • Material grade & UNS
  • Fastener standard
  • Diameter, length & thread
  • Heat-treatment condition
  • Mechanical requirements
  • Inspection / PMI / MTC requirements
  • Surface finish or coating

Buy Aanuraj Hex Bolts Online

Selected products currently listed on the ecommerce store. Availability, sizes and prices can change; use the live product page for the latest information.

GradeSizeReference online price
SS 304M16 × 100₹80BUY ONLINE ↗
SS 304M20 × 75₹106BUY ONLINE ↗
SS 316 B8MM20 × 100See live pageBUY ONLINE ↗
Super Duplex 2507M12 × 80₹180BUY ONLINE ↗
Super Duplex 2507M16 × 45₹180BUY ONLINE ↗
Hastelloy C276M8 × 30₹165BUY ONLINE ↗
Hastelloy C276M16 × 40₹650BUY ONLINE ↗
Hastelloy C22InchSee live pageBUY ONLINE ↗
VIEW ALL HEX BOLTS ↗ REQUEST QUOTATION

Technical Data Download

Download the combined technical reference covering material grades, chemical composition, mechanical reference values, heat treatment, metric DIN/ISO/ASME dimension comparison and inch ASME B18.2.1 dimensions.

DOWNLOAD TECHNICAL DATA PDF

The PDF is embedded in this HTML page, so the download works even when this HTML file is opened directly from your computer. For WordPress, upload the same PDF to Media Library and point this button to the Media URL. For final design and procurement, the applicable edition of the ordered standard and the supplied Material Test Certificate govern.