Flat Head Countersunk Socket Cap Screw UNC/UNF – Imperial

Socket Cap Screws

UNC/UNF

*Flat Head Countersunk

S325 – UNC/UNF Bare Steel

ANSI/ASME B18.3

2003

Diameter-UNC #6-32 #8-32 #10-24 1/4-20 5/16-18 3/8-16 7/16-14 1/2-13 5/8-11 3/4-10 7/8-9 1-8
Diameter Code 006 008 010 014 016 018 020 024 026 028 030 034
t .066 .076 .087 .111 .135 .159 .159 .172 .220 .220 .248 .297
s 5/64 3/32 1/8 5/32 3/16 7/32 1/4 5/16 3/8 1/2 9/16 5/8
.078 .094 .125 .156 .188 .219 .250 .312 .375 .500 .562 .625
k max. .097 .112 .127 .161 .198 .234 .234 .251 .324 .396 .468 .540
d2 max. .307 .359 .411 .531 .656 .781 .844 .938 1.188 1.438 1.688 1.938
R.S. Torque (in-lb) 16.5 30.1 43.7 104 215 382 611 931 1722 3054 4928 7388
Length Code Pkg.
1/4 0025 100 100
5/16 0031 100
3/8 0038 100 100 100 100 100
1/2 0050 100 100 100 100 100 100
5/8 0063 100 100 100 100 100 100
3/4 0075 100 100 100 100 100 100 100 100
7/8 0088 100
1 0100 100 100 100 100 100 100 100 100 50
1-1/4 0125 100 100 100 100 100 100 100 50 25
1-1/2 0150 100 100 100 100 100 100 100 50 25
1-3/4 0175 100 100 100 100 100 100 50 50 25
2 0200 100 100 100 100 100 100 50 50 50 25
2-1/4 0225 100 100 100 50 25 25
2-1/2 0250 100 100 100 100 50 50 25 25
3 0300 100 100 100 50 50 25 25 25
3-1/2 0350 100 100 50 50 25 25
4 0400 100 100 100 50 25 25 25 10
4-1/2 0450 50 50 25 25
5 0500 50 50 25 25 10
6 0600 50 50 25 25
Order Number -> 1/4 x 2-1/2 UNC = S325-014-0250 (Diameter Code x Length Code)

 

Diameter-UNF 10-32 1/4-28 5/16-24 3/8-24 1/2-20
Diameter Code 010 014 016 018 024
t .087 .111 .135 .159 .172
s 1/8 5/32 3/16 7/32 5/16
.125 .156 .188 .219 .312
k max. .127 .161 .198 .234 .251
d2 max. .411 .531 .656 .781 .938
R.S. Torque (in-lb) 43.7 104 215 382 931
Length Code Pkg.
1/4 0025 100
3/8 0038 100 100
1/2 0050 100 100 100
5/8 0063 100 100 100
3/4 0075 100 100 100 100 100
1 0100 100 100 100 100 100
1-1/4 0125 100 100 100 100 100
1-1/2 0150 100 100 100 100 100
1-3/4 0175 100 100 100
2 0200 100 100 100 100
Order Number -> 1/4 x 2-1/2 UNF = S325-014-0250-F (Diameter Code x Length Code)(Fine Thread add -F)

   *82 degree countersink +/- 2 degrees

R.S. Torque = Recommended Seating Torque

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