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#4-40 X 1/4 F837 18-8 Stainless Steel Socket Head Cap Screw

Selected 18-8 Stainless Steel Finish Hex Jam Nut18-8 SS Socket Head Cap Screw
18-8 Stainless Steel Finish Hex Jam Nut18-8 SS Socket Head Cap Screw

Product Specification

Length
1/4
Thread Length
0.2500
Grade
304 Stainless Steel, 18-8 Stainless Steel
Finish
None
Diameter
#4

Governing Standards

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 Properties

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.

Dimensional Specifications

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.

Chemical Properties

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