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ASTM A1082/A1082M Bolting Specification

High Strength Precipitation Hardening and Ferritic and Austenitic Duplex Stainless Steel Bolting for Special Purpose Applications

ASTM A1082/A1082M Hex Bolts, Heavy Hex Bolts, Studs, Socket Head Cap Screws, Threaded Rods

ASTM A1082 / A1082M covers High Strength Precipitation Hardening and Ferritic and Austenitic Duplex Stainless Steel Bolting for Special Purpose Applications such as pressure vessels. Selection will depend upon design, service conditions, mechanical properties and characteristics related to the application. Bars shall be produced in accordance with Specifications A276/A276M, A479/A479M or A564/A564M as applicable. Finish (hot or cold, ground, rough turned, drawn, etc.) shall be at the option of the manufacturer unless otherwise specified in the purchase order or contract.

Related Specifications of ASTM A1082/A1082M Bolting

ASTM A276 ASTM A479 ASTM A453 ASTM A564 ASTM B637 ASTM A638 ASTM A693 ASTM A1014 ASTM F738 ASTM F2281 AS 7467 ISO 3506-1

ASTM A1082/A1082M Chemical RequirementsA

Grades UNS DesignationB TypeB C Mn P S Si Cr Ni Mo N Other Elements
ASTM A1082/A1082M Duplex (Ferritic-Austenitic) Grades S31100 . . . 0.06 1.00 0.045 0.030 1.00 25.0-27.0 6.0-7.0 . . . . . . Ti 0.25
S31260 . . . 0.030 1.00 0.030 0.030 0.75 24.0-26.0 5.5-7.5 2.5-3.5 0.10-0.30 Cu 0.20-0.80,W 0.10-0.50
S31803 . . . 0.030 2.00 0.030 0.020 1.00 21.0-23.0 4.5-6.5 2.5-3.5 0.08-0.20 . . .
S32101 . . . 0.040 4.0-6.0 0.040 0.030 1.00 21.0-22.0 1.35-1.70 0.10-0.80 0.20-0.25 Cu 0.10-0.80
S32202 . . . 0.030 2.00 0.040 0.010 1.00 21.5-24.0 1.0-2.80 0.45 0.18-0.26 . . .
S32205 2205 0.030 2.00 0.030 0.020 1.00 22.0-23.0 4.5-6.5 3.0-3.5 0.14-0.20 . . .
S32304 2304 0.030 2.50 0.040 0.030 1.00 21.5-24.5 3.0-5.5 0.05-0.60 0.05-0.20 Cu 0.05-0.60
S32506 . . . 0.030 1.00 0.040 0.015 0.90 24.0-26.0 5.5-7.2 3.0-3.5 0.08-2.0 W 0.05-0.30
S32550 255 0.040 1.50 0.040 0.030 1.00 24.0-27.0 4.5-6.5 2.9-3.9 0.10-0.25 Cu 1.50-2.50
S32750 2507 0.030 1.20 0.035 0.020 0.80 24.0-26.0 6.0-8.0 3.0-5.0 0.24-0.32 Cu 0.50
S32760 . . . 0.030 1.00 0.030 0.010 1.00 24.0-26.0 6.0-8.0 3.0-4.0 0.20-0.30 Cu 0.50-1.00, W 0.50-1.00, %Cr+3.3x%Mo +16x%N≥40
S32906 . . . 0.030 0.80-1.50 0.030 0.030 0.50 28.0-30.0 5.8-7.5 1.50-2.60 0.30-0.40 Cu 0.80
S32950 . . . 0.030 2.00 0.035 0.010 0.60 26.0-29.0 3.5-5.2 1.00-2.50 0.15-0.35 . . .
S39277 . . . 0.025 0.80 0.025 0.002 0.80 24.0-26.0 6.5-8.0 3.0-4.0 0.23-.033 Cu 1.20-2.00, W 0.80-1.20
ASTM A1082/A1082M Precipitation Hardening Grades S15700 632 0.09 1.00 0.040 0.030 1.00 14.0-16.0 6.5-7.7 2.00-3.00 . . . Al 0.75-1.50
S17400 630 0.07 1.00 0.040 0.030 1.00 15.0-17.0 3.0-5.0 . . . . . . Cu 3.0-5.0, Cb +Ta 0.15-0.45
S17600 635 0.08 1.00 0.040 0.030 1.00 16.0-17.5 6.0-7.5 . . . . . . Al 0.40, Ti 0.40-1.20
S17700 631 0.09 1.00 0.040 0.030 1.00 16.0-18.0 6.5-7.7 . . . . . . Al 0.75-1.50
S35500 634 0.10-0.15 0.50-1.25 0.040 0.030 0.50 15.0-16.0 4.0-5.0 2.5-3.2 0.07-0.13 Cb 0.10-0.50
  • (A) Maximum or range unless otherwise indicated.
  • (B) See Guide A959/A959M.

ASTM A1082/A1082M Solution Treatment and Mechanical Property Requirements for PH Grades

UNS Designation Type Solution TreatmentB, C °F [°C] Mechanical Property Requirements in the Solution Treated Condition
Tensile Strengthksi [MPa] Yield Strengthksi [MPa] Elongation in 2" [50 mm] or 4D, min. % Reduction of Area, min. % HardnessD
Rockwell,maximum Brinell, maximum
S15700 632 . . . . . . . . . . . . . . . 100 HRB 269
S17400 630 Cool to below 90 [32] . . . . . . . . . . . . 38 HRC 363
S17600 635 Air Cool 120 [825] 75 [515] 10 45 32 HRC 302
S17700 631 . . . . . . . . . . . . . . . 98 HRB 229
S35500 634 Hold at ≤ -100 [-73] for at least 3 hours . . . . . . . . . . . . . . . 363
  • (A) Values shown are minimums or ranges unless maximum is indicated.
  • (B) 1900 [1040] ± 25°F [15°C].
  • (C) Quenched in water unless the table specifies another media.
  • (D) Either Rockwell or Brinell testing is permitted unless thickness is below 1/2 " in which case Rockwell is preferred.

ASTM A1082/A1082M Age Hardening Treatment and Mechanical Property Requirements for PH GradesA

Type Condition Suggested Hardening and/or Aging Temperatures, Time at Temperature, and Quench Media °F [°C]B,C,D,E Maximum Thickness inch [mm] inclusive Mechanical Properties
Tensile Strength ksi [MPA] Yield Strength ksi [MPA] Elongation in 2" [50 mm] or 4D % Reduction of Area, % HardnessF Impact Ft-lbf [J]
Rockwell, HRC Brinell
630 H900 900 [480], 1 hour 8 190 [1310] 170 [1170] 10 35 40 388 . . .
630 H925 925 [495], 4 hours 8 170 [1170] 155 [1070] 10 38 38 375 5 [6.8]
630 h4025 1025 [550], 4 hours 8 155 [1070] 145 [1000] 12 45 35 331 15 [20]
630 h4075 1075 [580], 4 hours 8 145 [1000] 125 [860] 13 45 32 311 20 [27]
630 h4100 1100 [595], 4 hours 8 140 [965] 115 [795] 14 45 31 302 25 [34]
630 h4150 1150 [620], 4 hours 8 135 [930] 105 [725] 16 50 28 277 30 [41]
630 h4150D 1150 [620] for 4 hrs., air cool plus 1150 [620] for 4 hrs., air cool 8 125 [860] 105 [725] 16 50 24-33 255-311 30 [41]
630 h4150M 1400 [760] for 2 hrs., air cool plus 1150 [620] for 4 hrs., air cool 8 115 [795] 75 [520] 18 55 24 255 55 [75]
631 RH950 1750 [955] for 10 min. to 1 h, rapidly cool to room temperature. Cool within 24 hrs. to -100 ± 10 [-75 ± 5], hold 8 hrs. min. Warm in air to room temperature. Heat to 950 [510] hold 1 h, air cool. 4 185 [1280] 150 [1030] 6 10 41 388 . . .
631 Th4050 1400 [760] for 90 min. Cool to 55 ± 5 [15 ± 3] within 1 h, hold 1/2 h min., heat to 1050 [565], hold for 90 min., air cool 6 170 [1170] 140 [965] 6 25 38 352 . . .
632 RH950 Same as Type 631 4 200 [1380] 175 [1210] 7 25 44 415 . . .
632 Th4050 Same as Type 631 6 180 [1240] 160 [1100] 8 25 38 375 . . .
634 h4000 1750 [955] for 10 min. to 1 h, water quench. Cool to -100 [75] min., hold 3 hrs. min. Temper at 1000 [540] hold for 3 h min, air cool. . . . 170 [1170] 155 [1070] 12 25 37 341 . . .
635 H950 950 [510], 1/2 h . . . 190 [1310] 170 [1170] 8 25 39 363 . . .
635 h4000 1000 [540], 1/2 h . . . 180 [1240] 160 [1100] 8 30 37 352 . . .
635 h4050 1050 [565], 1/2 h . . . 170 [1170] 150 [1035] 10 40 35 331 . . .
  • (A) Values shown are minimums or ranges unless maximum is indicated.
  • (B) ± 25°F [15°C]
  • (C) Temperatures are suggested and may be varied to obtain the required tensile properties.
  • (D) Time refers to the minimum time the material is at temperature and may be extended to obtain required ductility properties.
  • (E) Quenching shall be accomplished using air or gas cooling unless the table specifies another media.
  • (F) Either Rockwell or Brinell testing is permitted unless thickness is below 1/2 " in which case Rockwell is preferred.

ASTM A1082/A1082M Heat Treatment and Mechanical Property Requirements for Duplex GradesA

UNS Designation Solution Temperature, °F [°C]B,C Size Range Mechanical Properties
Tensile Strength,ksi [MPA] Yield Strength,ksi [MPA] Elongation in 2"[50 mm] or 4D % HardnessD
Rockwell, HRC maximum Brinell, maximum
S31100 1900 [1040] . . . 90 [620] 65 [450] 20 30 290
S31260 1870 to 2010 [1020 to 1100] . . . 100 [690] 70 [485] 20 31 297
S31803 1900 [1040] . . . 90 [620] 65 [450] 25 30 290
S32101 1870 [1020] . . . 94 [650] 65 [450] 30 30 290
S32202 1800 to 1975 [980 to 1080] . . . 94 [650] 65 [450] 30 30 290
S32205 1900 [1040] . . . 95 [655] 65 [450] 25 30 290
S32304 1800 [980] . . . 90 [620] 65 [450] 18 32 302
S32506 1870 - 2050 [1020 - 1120] . . . 90[620] 65 [450] 18 32 302
S32550 1900 [1040] . . . 110[760] 80 [550] 15 31 297
S32750 1880 - 2060 [1025 - 1125] 2 in. and under 116[800] 80 [550] 15 33 310
>2 in. 110 [760] 75 [515] 15 33 310
S32760 2010 [1100] . . . 109 [750] 80 [550] 25 30 290
S32900 1750 [955] . . . 90 [620] 70 [485] 15 30 290
S32906 1830 to 2100 [1000 to 1150] . . . 109 [750] 80 [550] 25 33 310
  • (A) Values shown are minimums or ranges unless maximum is indicated.
  • (B) ± 25°F [15°C].
  • (C) Quenched in water.
  • (D) Either Rockwell or Brinell testing is permitted unless thickness is below 1/2" in which case Rockwell is preferred.

ASTM A1082/A1082M Bolting Surface Treatment Specifications

ASTM A1082/A1082M Bolting Components Marking

Product Shall be Marked with our manufacturing trade mark "TorqBolt" or "TB" along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.

Grades UNS Designation Type Condition Grade Symbol
ASTM A1082/A1082M Duplex (Ferritic-Austenitic) Grades S31100 . . . . . . TB 31100
S31260 . . . . . . TB 31260
S31803 . . . . . . TB 31803
S32101 . . . . . . TB 32101
S32202 . . . . . . TB 32202
S32205 2205 . . . TB 32205
S32304 2304 . . . TB 32304
S32506 . . . . . . TB 32506
S32550 255 . . . TB TB 32550
S32750 2507 . . . TB 32750
S32760 . . . . . . TB 32760
S32900 . . . . . . . . .
S32906 . . . . . . TB 32906
ASTM A1082/A1082M Precipitation Hardening Grades S15700 632 . . . TB 157
S15700 632 RH95 TB 157A
S15700 632 Th4050 TB 157B
S17400 630 . . . TB 174
S17400 630 H900 TB 174A
S17400 630 H925 TB 174B
S17400 630 h4025 TB 174C
S17400 630 h4075 TB 174D
S17400 630 h4100 174E
S17400 630 h4150 TB 174G
S17400 630 h4150D TB 174H
S17400 630 h4150M 174J
S17600 635 . . . TB 176
S17600 635 H950 TB 176A
S17600 635 h4000 TB 176B
S17600 635 h4050 TB 176C
S17700 631 . . . TB 177
S17700 631 RH95 TB 177A
S17700 631 Th4050 TB 177B
S35500 634 . . . TB 355
S35500 634 h4000 TB 355A

ASME Dimensional Standards

B18.31.2 Imperial Continious Thread, Double End Reduced & Full Body Studs
B18.31.1M Metric Continious Thread, Double End Reduced & Full Body Studs
B16.5 Imperial Full Thread Stud Bolts
B16.5 Metric Full Thread Stud Bolts
B18.2.1 Square Lag Screws
B18.2.1 Hex Lag Screws
B18.2.1 Hex Cap Screws
B18.2.1 Heavy Hex Cap Screws
B18.2.1 Heavy Hex Screws
B18.2.1 Hex Flange Screws
B18.2.1 Askew Head Bolts
B18.2.1 Square Bolts
B18.2.1 Hex Bolts
B18.2.1 Heavy Hex Bolts
B18.2.3.1M Metric Hex Cap Screws
B18.2.3.3M Metric Heavy Hex Screws
B18.2.3.5M Metric Hex Bolts
B18.3 Hexagon Socket Head Cap Screws
B18.3 Hexagon Socket Head Shoulder Screws
B18.3 Hexagon Socket Flat Countersunk Head Cap Screws
B18.3 Spline Socket Head Cap Screws
B18.3 Hexagon And Spline Socket Head Cap Screws
B18.3 Hexagon Socket And Spline Socket Button Head Cap Screws
B18.3 Hexagon And Spline Socket Flat Countersunk Head Cap Screws
B18.3 Hexagon And Spline Socket Set Screws
B18.3 Hexagon And Spline Socket Set Screw Optional Cup Points
B18.3.1M Metric Socket Head Cap Screws
B18.6.7M Metric Machine Screws
B18.2.2 Imperial Square, Hex, Heavy Hex, Lock, Heavy Hex Lock Nuts
B18.2.4.1M Metric Hex Nuts
B18.2.4.6M Metric Heavy Hex Nuts
ISO 4033 Hexagon High Nuts
ISO 4032 Hexagon Nuts
ISO 4035 Hexagon Lock Nuts

ASTM A1082/A1082M Bolting Certifications

  • EN 10204 3.1
  • EN 10204 3.2
  • PED 2014/68/EC
  • MERKBLATT AD 2000 W2/W7/W10
  • API 20 E BSL 1/ BSL 2
  • NACE MR 0175
  • NACE MR 0103

ASTM A1082/A1082M Testing Standards

E18 Test Methods for Rockwell Hardness of Metallic Materials
E112 Test Methods for Determining Average Grain Size
E709 Guide for Magnetic Particle Testing
A962/A962M Specification for Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the Creep Range
A788/A788M Specification for Steel Forgings, General Requirements

ASME Threading Specifications

ASME B1.1 Unified Inch Screw Threads (UN and UNR Thread Form)
ASME B1.3  Screw Thread Gaging System for Dimensional Acceptability - Inch Screw Threads (IN, UNR, and UNJ)
ASME B1.13M Metric Screw Threads - M Profile
ASME B1.21M Metric Screw Threads - MJ Profile
ASME B1.2 Gages & gauing for Unified Screw Threads(Imperial)

ASTM A1082/A1082M Supplementary Requirements

S1 Charpy Impact Tests
S2 Product Marking
S3 Stress Relieving
S4 Non-Destructive Inspection
S5 Proof Load Testing
S6 Cross-Sectional Hardness Testing on Nuts