18-8 SS Socket Head Cap Screw
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18-8 SS Socket Head Cap Screw

ASTM F837 stainless steel socket head cap screws (also known as Allen head screws) have a cylindrical head with a flat chamfered top surface, knurled cylindrical sides and hexagonal recess. The ASTM F837 specification covers the chemical and mechanical requirements for stainless steel inch socket head cap screws. Dimensional specifications are governed by ASME B18.3. Socket Head Cap screws require less surface area to counterbore.These fasteners are commonly used in applications in which it is necessary to recess the head of the fastener, as well as applications where space limits the size of the head, and the tool that drives the fastener. Stainless steel fasteners are commonly used in applications that require general atmospheric corrosion resistance, such as chemical and food processing equipment. Stainless steel has a higher corrosion resistance than carbon steel.Thread lengths listed are minimum thread lengths, actual thread length may be longer.

Governing StandardsStainless Steel Socket Head Cap Screw

ASTM F837 This specification covers the chemical and mechanical requirements for stainless steel inch socket head cap screw (SHCS) with nominal thread 0.060 through 1.500 in. and intended for use in applications requiring general corrosion resistance.
ASME B18.3 Covers the complete general and dimensional data for various types of hexagon socket cap screws, shoulder screws, set screws, and hexagon keys recognized as an American National Standard.
ASME B1.1 UNC & UNF Class 2A Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Stainless Steel Socket Head Cap Cap Screw Marking
Stainless Steel Socket Head Cap Screw requires no material marking

Mechanical PropertiesStainless Steel Socket Head Cap Screw

Austenitic Stainless Steel Per ASTM F837-13
Alloy Group 1,
Condition CW
Nominal Thread
Diameter (1)
Full-Size Product Machine Specimen Core Hardness (2)
Tensile
Strength
Minimum
Extension (3)
Tensile
Strength
Yield
Strength
Minimum
Elongation
Vickers Rockwell
ksi ksi ksi %
0.60-0.750 80 min 0.4D 80 min 40 min 25 150 min 50 HRA min
  1. 1. For fasteners with nominal thread diameter larger than 0.750 in., the mechanical properties and marking shall be agreed upon between the user and manufacturer.
  2. 2. Core hardness is only required when full-size product tensile testing cannot be accomplished.
  3. 3. D denotes nominal thread size.

Chemical PropertiesStainless Steel Socket Head Cap Screw

Per ASTM F837-13
Material Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Copper
% by weight % by weight % by weight % by weight % by weight % by weight % by weight % by weight
Alloy Group 1,
UNS S30400
0.08 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 10.5 1.00

Dimensional SpecificationsStainless Steel Socket Head Cap Screw

Stainless steel socket head cap screw dimensions
Per ASME B18.3-2012
Size Nominal UNC UNF D A H J LT
Body Diameter Head Diameter Head Height Hex Socket Size Thread
Length
Max Min Max Min Max Min Fraction
Nominal
Decimal
Nominal
Min
#0 0.0600   80 0.0600 0.0568 0.0960 0.0910 0.0600 0.0570 …. 0.0500 0.5000
#1 0.0730 64 72 0.0730 0.0695 0.1180 0.1120 0.0730 0.0700 1/16 0.0620 0.6625
#2 0.0860 56 64 0.0860 0.0822 0.1400 0.1340 0.0860 0.0830 5/64 0.0780 0.6250
#3 0.0990 48 56 0.0990 0.0949 0.1610 0.1540 0.0990 0.0950 5/64 0.0780 0.6250
#4 0.1120 40 48 0.1120 0.1075 0.1830 0.1760 0.1120 0.1080 3/32 0.0940 0.7500
#5 0.1250 40 44 0.1250 0.1202 0.2050 0.1980 0.1250 0.1210 3/32 0.0940 0.7500
#6 0.1380 32 40 0.1380 0.1329 0.2260 2.1800 0.1380 0.1340 7/64 0.1090 0.7500
#8 0.1640 32 36 0.1640 0.1585 0.2700 2.6200 0.1640 0.1590 9/64 0.1410 0.8750
#10 0.1900 24 32 0.1900 0.1840 0.3120 0.3030 0.1900 0.1850 5/32 0.1560 0.8750
#12 0.2120 24 28 0.2160 0.2095 0.3240 0.3140 0.2160 0.2100 5/32 0.1560 0.8750
1/4 0.2500 20 28 0.2500 0.2435 0.3750 0.3650 0.2500 0.2440 3/16 0.1880 1.0000
5/16 0.3125 18 24 0.3125 0.3053 0.4690 0.4570 0.3120 0.3060 1/4 0.2500 1.1250
3/8 0.3750 16 24 0.3750 0.3678 0.5620 0.5500 0.3750 0.3680 5/16 0.3120 1.2500
7/16 0.4375 14 20 0.4375 0.4294 0.6560 0.6420 0.4380 0.4300 3/8 0.3750 1.3750
1/2 0.5000 13 20 0.5000 0.4919 0.7500 0.7350 0.5000 0.4920 3/8 0.3750 1.5000
5/8 0.6250 11 18 0.6250 0.6163 0.9380 0.9210 0.6250 0.6160 1/2 0.5000 1.7500
3/4 0.7500 10 16 0.7500 0.7406 1.1250 1.1070 0.7500 0.7400 5/8 0.6250 2.0000
7/8 0.8750 9 14 0.8750 0.8647 1.3120 1.2930 0.8750 0.8640 3/4 0.7500 2.2500
1 1.0000 8 14 1.0000 0.9886 1.5000 1.4790 1.0000 0.9880 3/4 0.7500 2.5000
1 1/8 1.1250 7 12 1.1250 1.1086 1.6880 1.6650 1.1250 1.1110 7/8 0.8750 2.7500
1 1/4 1.2500 7 12 1.2500 1.2336 1.8750 1.8520 1.2500 1.2360 7/8 0.8750 3.0000
1 3/8 1.3750 7 12 1.3750 1.3568 2.0620 2.0380 1.3750 1.3600 1 1.0000 3.2500
1 1/2 1.5000 6 12 1.5000 1.4818 2.2500 2.2240 1.5000 1.4850 1 1.0000 3.5000
1 3/4 1.7500 5 12 1.7500 1.7295 2.6250 2.5970 1.7500 1.7340 1 1/4 1.2500 4.3800
2 2.0000 4 12 2.0000 1.9780 3.0000 2.9700 2.0000 1.9830 1 1/2 1.5000 5.0000
2 1/4 2.2500 4 12 2.2500 2.2280 3.3750 3.3440 2.2500 2.2320 1 3/4 1.7500 5.6200
2 1/2 2.5000 4 12 2.5000 2.4762 3.7500 3.7170 2.5000 2.4810 1 3/4 1.7500 6.2500
2 3/4 2.7500 4 12 2.7500 2.7262 4.1250 4.0900 2.7500 2.7300 2 2.0000 6.8800
3 3.0000 4 12 3.0000 2.9762 4.5000 4.4640 3.0000 3.9790 2 1/4 2.2500 7.5000
3 1/4 3.2500 4 12 3.2500 3.2262 4.8750 4.8300 3.2500 3.2280 2 1/4 2.2500 8.1200
3 1/2 3.5000 4 12 3.5000 3.4762 5.2500 5.2110 3.5000 3.4780 2 3/4 2.7500 8.7500
3 3/4 3.7500 4 12 3.7500 3.7262 5.6250 5.5840 3.7500 3.7270 2 3/4 2.7500 9.3800
4 4.0000 4 12 4.0000 3.9762 6.0000 5.9580 4.0000 3.9760 3 3.0000 10.0000
  1. All dimensions are in inches.
18-8 SS Socket Head Cap Screw
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Diameter Thread Pitch Length Item # Availability Price Quantity UOM
#4 40 1/4 SCSC 40025 In Stock $0.04758/EA EA
#4 40 3/8 SCSC 40037 In Stock $0.20024/EA EA
#4 40 5/8 SCSC 40062 3-5 Working Days $0.52062/EA EA
#4 40 3/4 SCSC 40075 In Stock $0.04005/EA EA
#4 40 1 SCSC 40100 In Stock $0.08106/EA EA
#6 32 1/4 SCSC 60025 In Stock $0.03596/EA EA
#6 32 3/8 SCSC 60037 In Stock $0.12771/EA EA
#6 32 1/2 SCSC 60050 In Stock $0.06227/EA EA
#6 32 3/4 SCSC 60075 In Stock $0.10921/EA EA
#6 32 1 SCSC 60100 In Stock $0.12014/EA EA
#6 32 1 1/2 SCSC 60150 In Stock $0.12451/EA EA
#8 32 3/8 SCSC 80037 In Stock $0.11906/EA EA
#8 32 1/2 SCSC 80050 In Stock $0.07885/EA EA
#8 32 3/4 SCSC 80075 In Stock $0.0861/EA EA
#8 32 1 SCSC 80100 In Stock $0.15855/EA EA
#8 32 1 1/2 SCSC 80150 In Stock $0.15603/EA EA
#10 24 1/4 SCSC1020025 In Stock $0.24029/EA EA
#10 24 3/8 SCSC1020037 In Stock $0.12531/EA EA
#10 24 1/2 SCSC1020050 In Stock $0.07161/EA EA
#10 24 3/4 SCSC1020075 In Stock $0.09463/EA EA
#10 24 1 SCSC1020100 In Stock $0.12006/EA EA
#10 24 1 1/4 SCSC1020125 In Stock $0.1853/EA EA
#10 24 1 1/2 SCSC1020150 In Stock $0.32022/EA EA
#10 24 2 SCSC1020200 In Stock $0.26223/EA EA
#10 24 3 SCSC1020300 In Stock $0.43769/EA EA
#10 32 3/8 SCSC1030037 In Stock $0.07581/EA EA
#10 32 1/2 SCSC1030050 In Stock $0.10192/EA EA
#10 32 5/8 SCSC1030062 In Stock $0.12014/EA EA
#10 32 1 1/4 SCSC1030125 In Stock $0.17225/EA EA
#10 32 1 1/2 SCSC1030150 In Stock $0.20024/EA EA
#10 32 2 SCSC1030200 In Stock $0.49952/EA EA
#10 32 2 1/2 SCSC1030250 In Stock $0.68082/EA EA
#12 24 3/4 SCSC1220075 In Stock $0.37337/EA EA
#12 24 1 SCSC1220100 In Stock $0.64421/EA EA
#12 24 1 1/2 SCSC1220150 In Stock $0.58166/EA EA
1/4 20 3/8 SCSC0250037 In Stock $0.1346/EA EA
1/4 20 1/2 SCSC0250050 In Stock $0.13288/EA EA
1/4 20 5/8 SCSC0250062 In Stock $0.15551/EA EA
1/4 20 3/4 SCSC0250075 In Stock $0.15563/EA EA
1/4 20 1 SCSC0250100 In Stock $0.16444/EA EA
1/4 20 1 1/4 SCSC0250125 In Stock $0.18751/EA EA
1/4 20 1 1/2 SCSC0250150 In Stock $0.18554/EA EA
1/4 20 1 3/4 SCSC0250175 In Stock $0.3/EA EA
1/4 20 2 SCSC0250200 In Stock $0.38422/EA EA
1/4 20 2 1/4 SCSC0250225 In Stock $0.39567/EA EA
1/4 20 2 1/2 SCSC0250250 In Stock $0.37797/EA EA
1/4 20 3 SCSC0250300 In Stock $0.52283/EA EA
1/4 28 3/8 SCSC0250037NF In Stock $0.13224/EA EA
1/4 28 1/2 SCSC0250050NF In Stock $0.17381/EA EA
1/4 28 3/4 SCSC0250075NF In Stock $0.16019/EA EA
1/4 28 1 SCSC0250100NF In Stock $0.46764/EA EA
5/16 18 1/2 SCSC0310050 In Stock $0.31606/EA EA
5/16 18 5/8 SCSC0310062 In Stock $0.33937/EA EA
5/16 18 3/4 SCSC0310075 In Stock $0.3026/EA EA
5/16 18 1 SCSC0310100 In Stock $0.29315/EA EA
5/16 18 1 1/4 SCSC0310125 In Stock $0.33716/EA EA
5/16 18 1 1/2 SCSC0310150 In Stock $0.37201/EA EA
5/16 18 1 3/4 SCSC0310175 In Stock $0.43064/EA EA
5/16 18 2 SCSC0310200 In Stock $0.61438/EA EA
5/16 18 2 1/4 SCSC0310225 In Stock $0.93761/EA EA
5/16 18 2 1/2 SCSC0310250 In Stock $0.70384/EA EA
5/16 18 2 3/4 SCSC0310275 In Stock $0.80833/EA EA
5/16 18 3 SCSC0310300 In Stock $0.84101/EA EA
5/16 18 3 1/2 SCSC0310350 In Stock $1.95274/EA EA
5/16 24 1/2 SCSC0310050NF In Stock $0.32503/EA EA
5/16 24 3/4 SCSC0310075NF In Stock $0.43284/EA EA
5/16 24 1 SCSC0310100NF In Stock $0.51346/EA EA
3/8 16 1/2 SCSC0370050 In Stock $0.57637/EA EA
3/8 16 3/4 SCSC0370075 In Stock $0.32723/EA EA
3/8 16 1 SCSC0370100 In Stock $0.47661/EA EA
3/8 16 1 1/4 SCSC0370125 In Stock $0.53008/EA EA
3/8 16 1 1/2 SCSC0370150 In Stock $0.6688/EA EA
3/8 16 1 3/4 SCSC0370175 In Stock $0.79339/EA EA
3/8 16 2 SCSC0370200 In Stock $1.06952/EA EA
3/8 16 2 1/4 SCSC0370225 In Stock $1.09095/EA EA
3/8 16 2 1/2 SCSC0370250 In Stock $1.52711/EA EA
3/8 16 3 SCSC0370300 In Stock $1.1306/EA EA
3/8 16 3 1/2 SCSC0370350 In Stock $1.60192/EA EA
3/8 16 4 SCSC0370400 In Stock $2.30124/EA EA
3/8 16 4 1/2 SCSC0370450 In Stock $15.01802/EA EA
3/8 24 3/4 SCSC0370075NF In Stock $0.80096/EA EA
3/8 24 1 SCSC0370100NF In Stock $0.98851/EA EA
3/8 24 1 1/2 SCSC0370150NF In Stock $1.36336/EA EA
3/8 24 2 SCSC0370200NF In Stock $1.88302/EA EA
3/8 24 2 1/4 SCSC0370225NF In Stock $2.32279/EA EA
3/8 24 2 1/2 SCSC0370250NF In Stock $1.1/EA EA
7/16 14 1/2 SCSC0430050 In Stock $3.56268/EA EA
7/16 14 3/4 SCSC0430075 In Stock $0.84101/EA EA
7/16 14 1 SCSC0430100 In Stock $0.80985/EA EA
7/16 14 1 1/2 SCSC0430150 In Stock $1.20144/EA EA
7/16 14 1 3/4 SCSC0430175 In Stock $1.57918/EA EA
7/16 14 2 SCSC0430200 In Stock $1.87994/EA EA
7/16 14 2 1/2 SCSC0430250 In Stock $2.72327/EA EA
7/16 14 3 SCSC0430300 In Stock $2.35803/EA EA
1/2 13 3/4 SCSC0500075 In Stock $1.00621/EA EA
1/2 13 1 SCSC0500100 In Stock $1.17425/EA EA
1/2 13 1 1/4 SCSC0500125 In Stock $1.15471/EA EA
1/2 13 1 1/2 SCSC0500150 In Stock $1.0813/EA EA
1/2 13 1 3/4 SCSC0500175 3-5 Working Days $1.66584/EA EA
1/2 13 2 SCSC0500200 In Stock $1.65366/EA EA
1/2 13 2 1/4 SCSC0500225 In Stock $1.99571/EA EA
1/2 13 2 1/2 SCSC0500250 In Stock $1.82747/EA EA
1/2 13 3 SCSC0500300 In Stock $2.12363/EA EA
1/2 13 3 1/2 SCSC0500350 In Stock $2.99984/EA EA
1/2 13 4 SCSC0500400 In Stock $3.40693/EA EA
1/2 13 4 1/2 SCSC0500450 In Stock $3.82859/EA EA
1/2 13 5 SCSC0500500 In Stock $5.22759/EA EA
1/2 13 6 SCSC0500600 In Stock $7.332/EA EA
1/2 20 1 SCSC0500100NF In Stock $2.0825/EA EA
1/2 20 1 1/2 SCSC0500150NF In Stock $2.40288/EA EA
1/2 20 2 SCSC0500200NF In Stock $2.76332/EA EA
1/2 20 2 1/2 SCSC0500250NF In Stock $2.36284/EA EA
5/8 11 1 SCSC0620100 In Stock $1.85423/EA EA
5/8 11 1 1/4 SCSC0620125 In Stock $2.78486/EA EA
5/8 11 1 1/2 SCSC0620150 In Stock $2.31646/EA EA
5/8 11 1 3/4 SCSC0620175 In Stock $2.40288/EA EA
5/8 11 2 SCSC0620200 In Stock $7.21958/EA EA
5/8 11 2 1/4 SCSC0620225 In Stock $3.40408/EA EA
5/8 11 2 1/2 SCSC0620250 In Stock $3.29063/EA EA
5/8 11 3 SCSC0620300 In Stock $7.80629/EA EA
5/8 11 3 1/2 SCSC0620350 In Stock $5.6688/EA EA
5/8 11 4 SCSC0620400 In Stock $5.76175/EA EA
5/8 11 4 1/2 SCSC0620450 In Stock $5.96163/EA EA
3/4 10 1 SCSC0750100 In Stock $15.45855/EA EA
3/4 10 1 1/2 SCSC0750150 In Stock $4.21786/EA EA
3/4 10 2 SCSC0750200 In Stock $5.89279/EA EA
3/4 10 2 1/2 SCSC0750250 In Stock $6.90829/EA EA
3/4 10 3 SCSC0750300 In Stock $6.63652/EA EA
3/4 10 3 1/2 SCSC0750350 In Stock $8.81057/EA EA
3/4 10 4 SCSC0750400 In Stock $12.4149/EA EA