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Socket Set Screw

Selected F912 Hex Socket Head Cap Screw Alloy BlackSocket Set Screw
F912 Hex Socket Head Cap Screw Alloy BlackSocket Set Screw

ASTM F912 Hex Socket Set Screws are a headless fastener threaded its entire length (except for the point) used commonly for fastening mated parts such as a shaft and collar. The F912 specification covers the requirements for quenched and tempered alloy steel socket set screws. Dimensional specifications are governed by ASME B18.3. These set screws are intended for compression applications only and are not customarily subjected to embrittlement tests. The socket set screw's headless design allows the fastener to sit flush, or inset, into the threaded part.

 

Products

Governing Standards

ASTM F912 This specification covers the requirements for quenched and tempered alloy steel socket-set screws (SSS) in nominal diameters 0.060 through 2 in. having hardnesses 45 to 53 HRC.
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.

Alloy Steel Socket Set Screw Marking
Alloy Steel Socket Set Screw requires no material marking

Dimensional Specifications

Socket Set Screw dimensions
Per ASME B18.3-2012
Size Nominal UNC UNF J T C Oval Point
Radius		 Cone Point
Angles
Hex Socket Size Key
Engagement		 Cup & Flat Point
Diameters
Fraction
Nominal		 Decimal
Nominal		 Min Max Min Basic 90 Deg
Lengths
#0 0.0600   80 …. 0.0280 0.0500 0.0330 0.0270 0.0450 0.0900
#1 0.0730 64 72 …. 0.0350 0.0600 0.0400 0.0330 0.0550 0.0900
#2 0.0860 56 64 …. 0.0350 0.0600 0.0470 0.0390 0.0640 0.1300
#3 0.0990 48 56 …. 0.0500 0.0700 0.0540 0.0445 0.0740 0.1300
#4 0.1120 40 48 …. 0.0500 0.0700 0.0610 0.0510 0.0840 0.1900
#5 0.1250 40 44 1/8 0.0620 0.0800 0.0670 0.0570 0.0940 0.1900
#6 0.1380 32 40 1/8 0.0620 0.0800 0.0740 0.0640 0.1040 0.1900
#8 0.1640 32 36 5/64 0.0780 0.0900 0.0870 0.0760 0.1230 0.2500
#10 0.1900 24 32 3/32 0.0940 0.1000 0.1020 0.0880 0.1420 0.2500
1/4 0.2500 20 28 1/8 0.1250 0.1250 0.1320 0.0118 0.1880 0.3100
5/16 0.3125 18 24 5/32 0.1560 0.1560 0.1720 0.1560 0.2340 0.3800
3/8 0.3750 16 24 3/16 0.1880 0.1880 0.2120 0.1940 0.2810 0.4400
7/16 0.4375 14 20 7/32 0.2190 0.2190 0.2520 0.2320 0.3280 0.5000
1/2 0.5000 13 20 1/4 0.2500 0.2500 0.2910 0.2700 0.3750 0.5700
5/8 0.6250 11 18 5/16 0.3120 0.3120 0.3710 0.3470 0.4690 0.7500
3/4 0.7500 10 16 3/8 0.3750 0.3750 0.4500 0.4250 0.5620 0.8800
7/8 0.8750 9 14 1/2 0.5000 0.5000 0.5300 0.5020 0.6560 1.0000
1 1.0000 8 14 9/16 0.5620 0.5620 0.6090 0.5790 0.7500 1.1300
1 1/8 1.1250 7 12 9/16 0.5620 0.5620 0.6890 0.6550 0.8440 1.2500
1 1/4 1.2500 7 12 5/8 0.6250 0.6250 0.7670 0.7330 0.9380 1.5000
1 3/8 1.3750 7 12 5/8 0.6250 0.6250 0.8480 0.8080 1.0310 1.6300
1 1/2 1.5000 6 12 3/4 0.7500 0.7500 0.9260 0.8860 1.1250 1.7500
1 3/4 1.7500 5 12 1 1.0000 1.0000 1.0890 1.0390 1.3120 2.0000
2 2.0000 4 12 1 1.0000 1.0000 1.2440 1.1930 1.5000 2.2500
  1. All dimensions are in inches.

Chemical Properties

Per ASTM F912-11
Heat Analysis Product Analysis
Carbon Phosphorus Sulfur Carbon Phosphorus Sulfur
% by weight % by weight % by weight % by weight % by weight % by weight
0.30 to 0.48 0.035 0.040 0.28 to 0.50 0.04 0.045

Mechanical Properties

Per ASTM F912-11
Alloy Steel,
Quenched &
Tempered		 Rockwell Hardness
Limits
45 to 53 HRC