- “We Also Provide other product"
- Mobile NO: +91 98336 40613
- Send Your Mail At: sales@adfastcomponents.com
At Adfast Components, we manufacture stainless steel socket head cap screws in accordance with the ASTM F837 specification, which outlines the chemical and mechanical requirements for inch-series fasteners with nominal thread diameters ranging from 0.060 to 1.500 inches. These screws are designed for applications requiring general corrosion resistance.
ASTM F837 categorizes stainless steel alloys into two primary groups:
Austenitic Group 1
Martensitic Group 5
Additionally, ASTM F837M serves as the metric counterpart, covering sizes from M1.6 to M38.
Four property conditions are covered under this standard:
Austenitic (Group 1):
Annealed condition (AF) – 85 ksi max
Cold worked (CW) – 80 ksi min
Cold worked (CW1) – 102 ksi min
Martensitic (Group 5):
Heat treated (HT) – 160 ksi min
Adfast Components produces socket head cap screws compliant with both ASTM F837 and F837M standards. All products are fully tested and supplied with EN 10204 Type 3.1 certification. We offer a wide range of grades under this specification, with 304, 304L, 316, 316L, and 303 being among the most commonly used alloys.
| 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.
| 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.
| 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.
| 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 |
| Alloy Condition | Marking |
|---|---|
| Group 1 AF | AF |
| Group 1 CW | CW |
| Group 1 CW1 | CW1 |
| Group 5 HT | HT |