UNC

UNC

Socket countersunk screws UNC
Standards ASME/ANSI 18.3 - ASTM F835- Thread fit 3A
Heat treated alloy steel

Categories: , .

Ref: ?
Example: Ref. = H91NC - XX/XX - X XX/XX
↑ ↑
D L
1/4 x 1"1/4
Ref. = H91NC - 1 - 4 - 1 - 1 - 4

D #4 #5 #6 #8 #10 1/4” 5/16” 3/8” 7/16” 1/2” 5/8” 3/4” D
D1 min. 0.255 0.281 0.307 0.359 0.411 0.531 0.656 0.781 0.844 0.938 1.188 1.438 D1 min.
D2 max. 0.136 0.153 0.168 0.194 0.220 0.280 0.343 0.405 0.468 0.530 0.655 0.780 D2 max.
K 0.083 0.090 0.097 0.112 0.127 0.161 0.198 0.234 0.234 0.251 0.324 0.395 K
S 1/16 5/64 5/64 3/32 1/8 5/32 3/16 7/32 1/4 5/16 3/8 1/2 S
Hilos/ “ 40 40 32 32 24 20 18 16 14 13 11 10 Hilos/ “
L1 * L1
1.1 1.6 2 3.6 8.5 15.8 27.7 45.2 67.8 135.6 226 451.9
L 1/4 1/4 1/4 3/8 3/8 3/8 1/2 5/8 3/4 3/4 1” 1/4 1” 1/2 L
3/8 3/8 3/8 1/2 1/2 1/2 5/8 3/4 1” 1” 1” 1/2 1” 3/4
1/2 1/2 1/2 5/8 5/8 5/8 3/4 1” 1” 1/4 1” 1/4 1” 3/4 2”
5/8 5/8 5/8 3/4 3/4 3/4 1” 1” 1/4 1” 1/2 1” 1/2 2” 2 “1/2
3/4 3/4 3/4 1” 1” 1” 1” 1/4 1” 1/2 1” 3/4 2” 1/4 3”
1” 1/4 1” 1/4 1” 1/2 1” 3/4 2” 2 “1/2
1” 1/2 1” 1/2 1” 3/4 2” 2” 1/4 3”
1” 3/4 2” 2” 1/4 2 “1/2
2” 2” 1/4 2” 1/2 3”
2” 1/2 3”

D #10 1/4” 5/16” 3/8” 1/2”
L1= 1” 1/2 7/8 - - - -
1” 3/4 - 1” - - -
2” - 1” 1/4 1” 1/8 - -
2” 1/4 - - 1” 3/8 1” 1/4 -
2” 1/2 - - 1” 1/8 1” 1/2 1” 1/2
3” - - - 1” 1/2 2”
Recommended tightening torque

Hardness (≤1/2) 39-43 HRC (>1/2) 38-42 HRC
Working temperatures -29º a +204ºC
Minimum elongation at fracture 8%
Box qty.
x25  
x50  
x100  

Ref: ?
Example: Ref. = H91NC - XX/XX - X XX/XX
↑ ↑
D L
1/4 x 1"1/4
Ref. = H91NC - 1 - 4 - 1 - 1 - 4

* According to L1, fasteners above the blue line are completely threaded while those below are partially threaded.

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