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ASTM F837 Specification

ASTM F837 - Standard Specification for Stainless Steel Socket Head Cap Screws

This specification covers chemical and mechanical requirements for stainles steel inch (imperial) series socket head cap screws with nominal thread diameter 0.060 through 1.500 inch., intended for use in applications requiring general corrosion resistance. This specification contains two group of stainless steel alloys i.e, Austenitic Group 1 & Martensitic Group 5. ASTM F837M is a companion to ASTM F837 developed for metric size stainless steel socket head cap screws from M1.6 to M38. Four property conditions are covered: austenitic alloy group 1 in as annealed consition (AF) at 85 ksi maximum, in two cold worked conditions (CW) at 80 ksi minimum, (CW1) at 102 ksi minimum, and martensitic alloy group 5 in a heat treated condition (HT) at 160 ksi minimum. Ferrobend manufactures socket head cap screws as per both specifications duly tested and supplied with EN 10204 Type 3.1 Certification. We offer almost all grades under this specification, 304, 304L, 316, 316L, 303, being most commonly used alloys.

ASTM F837 Chemical Requirements

Composition, %, maximum except as shown
UNS Designation Alloy Group Alloy Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Copper Molybdenum
Austenitic Alloys
S30300 1 303A 0.15 2.00 0.200 0.150 min 1 17.0 - 19.0 8.0 - 10.0 -- 0.60 maxB
S30400 1 304 0.08 2.00 0.045 0.03 1 18.0 - 20.0 8.0 - 10.5 1.00 --
A30403 1 304L 0.03 2.00 0.045 0.030 1 18.0 - 20.0 8.0 - 12.0 1.00 --
S30500 1 305 0.12 2.00 0.045 0.03 1 17.0 - 19.0 10.5 - 13.0 1.00 --
S38400 1 384 0.08 2.00 0.045 0.030 1 15.0 - 17.0 17.0 - 19.0 -- --
S20300 1 XM1A 0.08 5.00 - 6.50 0.400 0.18 - 0.35 1 16.0 - 18.0 5.0 - 6.5 1.75 - 2.25 0.50maxB
S30430 1 18-9LW 0.10 2.00 0.045 0.030 1 17.0 - 19.0 8.0 - 10.0 3.0 - 4.0 --
S30433 1 302HQ 0.03 2.00 0.045 0.030 1 17.0 - 19.0 8.0 - 10.0 3.0 - 4.0 --
S31600 1 316 0.08 2.00 0.045 0.030 1 16.0 - 18.0 10.0 - 14.0 -- 2.0 - 3.0
S31603 2 316 L 0.03 2.00 0.045 0.030 1 16.0 - 18.0 10.0 - 14.0 -- 2.0 - 3.0
Martensitic Alloys
S41000 5 410 0.15 1.00 0.040 0.030 1 11.5 - 13.5 -- -- --

A Free machining grades are not recommended for forged products. These grades may be furnished only when approved by the purchaser.
B At manufacturer's option, determined only when intentionally added.

ASTM F837 Mechanical Properties

Alloy Group Condition Nominal Thread DiameterA Full Size Product Machined Specimen Core HardnessB
Tensile Strength, ksi Minimum ExtensionC Tensile Strength, ksi Yield Strength, ksi Minimum Elongation, % Vickers Rockwell
1 AF 0.06 - 1.50 85 max 0.6D 85 max 55 max 40 210 max 95 HRB max
1 CW 0.06 - 1.75 80 min 0.4D 80 min 40 min 25 150 min 50 HRA min
1 CW1 0.06 - 1.75 102 min 0.4D 87 min 65 min 20 220 min 59 HRA min
5 HT 0.06 - 0.19 180 min -- -- -- -- 350 - 423 36 - 43 HRC
5 HT 0.06 - 1.50 180 min 0.2D 160 min 120 min 12 350 - 423 36 - 43 HRC

A For CW and CW1 condition fasteners with nominal thread diameter larger than 0.750 inch, the mechanical properties shall be agreed upon between the user and the manufacturer.
B Core hardness is only required when full size product tensile testing cannot be accomplished.
C D denoted nominal thread size.

ASTM F837 Mechanical Testing Requirements

Item Product Length Hardness Test Condusted on Full Size Product Test Condusted on Machined Test Specification
max min Extension Axial Tensile Strength Yield Strength 0.2% offset Tensile Strength Elongation
1 ≤3 DA B B -- -- -- -- --
2 >3 D-12in. B -- B B -- -- --
3 Over 12 in. B -- A A B B B

A D Denotes nominal diameter of product.
B Denotes mandatory test. In addition, either all test denoted by A or all test denoted by B shall be performed. In case of arbitration full size tests, denoted A, shall be decisive.

ASTM F837 Tensile Stength Values for Full Size Fasteners, lbs

Nominal Size Stress Area Alloy Group 1 Alloy Group 5
AF max CW min CW1 min HT min
0.060-80 0.0018 153 144 183 288
0.073-64 0.00263 223 210 267 420
0.073-72 0.00278 236 222 283 444
0.086-56 0.00370 314 296 377 592
0.086-64 0.00394 334 315 401 630
0.099-48 0.00487 414 390 497 779
0.099-56 0.00523 445 418 533 837
0.112-40 0.00604 513 483 615 966
0.112-48 0.00661 562 529 674 1060
0.125-40 0.00796 676 636 811 1270
0.125-48 0.0083 706 665 848 1330
0.138-32 0.00909 772 727 927 1450
0.138-40 0.01015 862 811 1035 1620
0.164-32 0.01400 1191 1121 1429 2240
0.164-36 0.01474 1252 1178 1502 2360
0.190-24 0.0175 1490 1403 1788 2800
0.190-32 0.02000 1699 1600 2039 3200
0.250-20 0.03180 2705 2546 3246 5090
0.250-28 0.03640 3092 2910 3710 5820
0.312-18 0.05240 4457 4194 5348 8380
0.312-24 0.05800 4936 2654 5923 9280
0.375-16 0.07750 6 587 6 199 7 904 12 400
0.375-24 0.08780 7 465 7 026 8 958 14 000
0.437-14 0.1063 9 036 8 505 10 843 17 000
0.437-20 0.11870 10 091 9 497 12 109 19 000
0.500-13 0.14190 12 061 11 352 14 474 22 700
0.500-20 0.15990 13 596 12 796 16 315 25 600
0.625-11 0.22600 19 210 18 080 23 052 36 200
0.625-18 0.25600 21 756 20 477 26 108 41 000
0.750-10 0.33400 28 429 26 757 34 115 43 400
0.750-16 0.37300 31 702 29 837 38 042 59 700
0.875-9 0.46200 39 247 -- -- 73 900
0.875-14 0.50900 43 305 -- -- 81 400
1.000-8 0.60600 51 488 -- -- 97 000
1.000-12 0.66300 56 359 -- -- 106 000
1.125-7 0.76300 64 878 -- -- 122 000
1.125-12 0.85600 72 736 -- -- 137 000
1.250-7 0.96900 82 374 -- -- 155 000
1.250-12 1.07300 91 200 -- -- 172 000
1.375-6 1.15500 98 165 -- -- 185 000
1.375-12 1.31500 111 751 -- -- 210 000
1.500-6 1.40500 119 446 -- -- 225 000
1.500-12 1.58100 134 387 -- -- 253 000

ASTM F837 Alloy Condition Identification

Alloy Condition Marking
Group 1 AF AF
Group 1 CW CW
Group 1 CW1 CW1
Group 5 HT HT