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Unit:inch

Square Recessed Countersunk Head Screws [Table 2] (ASTM F837, F468)

ASME B 18.6.3 (T2-III) - 2013

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美标ASME B18.6.3 (T2-III) - 2013 ASME18.6. Square Recessed Countersunk Head Screws [Table 2] (ASTM F837, F468)
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Thread Size
d
2# 3# 4# 5# 6# 7# ③ 8# 10# 12#
d Nominal Size
PP
dk max
min
k Ref
M Type III
P Type III max
min
Socket No. ⑧ Type III
L
α max
min
0.0860 0.0990 0.1120 0.1250 0.1380 0.1510 0.1640 0.1900 0.2160
56 48 40 40 32 / 32 24 24
0.162 0.187 0.212 0.237 0.262 0.287 0.312 0.362 0.412
0.144 0.167 0.191 0.215 0.238 0.262 0.285 0.333 0.380
0.051 0.059 0.067 0.075 0.083 0.091 0.100 0.116 0.132
0.050 0.070 0.070 0.091 0.091 0.091 0.112 0.112 0.133
0.033 0.038 0.038 0.055 0.055 0.065 0.063 0.075 0.095
0.028 0.028 0.028 0.040 0.040 0.050 0.048 0.060 0.080
00 0 0 1S 1S 1R 2S 2R 3R
1/8 1/8 3/16 3/16 3/16 / 1/4 5/16 3/8
82° 82° 82° 82° 82° 82° 82° 82° 82°
80° 80° 80° 80° 80° 80° 80° 80° 80°
Thread Size
d
14# ③ 1/4 16# ③ 18# ③ 5/16 20# ③ 24# ③ 3/8
d Nominal Size
PP
dk max
min
k Ref
M Type III
P Type III max
min
Socket No. ⑧ Type III
L
α max
min
0.2420 0.2500 0.2680 0.2940 0.3125 0.3200 0.3720 0.3750
/ 20 / / 18 / / 16
0.462 0.477 0.512 0.561 0.597 0.611 0.711 0.717
0.427 0.442 0.475 0.522 0.556 0.569 0.664 0.670
0.148 0.153 0.164 0.180 0.191 0.196 0.228 0.230
0.133 0.133 0.133 0.191 0.191 0.191 0.191 0.191
0.095 0.095 0.095 0.100 0.100 0.100 0.100 0.100
0.080 0.080 0.080 0.085 0.085 0.085 0.085 0.085
3R 3R 3R 4R 4R 4R 4R 4R
/ 7/16 / / 1/2 / / 9/16
82° 82° 82° 82° 82° 82° 82° 82°
80° 80° 80° 80° 80° 80° 80° 80°
①,Edge of head may be rounded or flat.
②,Screws of these lengths and shorter shall have undercut heads.
③,7#, 14#, 16#, 18#, 20#, 24# are for tapping screws only.
④,Machine Screw Length of Thread 1) Sizes No.5 and smaller. Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 1-1/8 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall, unless otherwise specified, have a minimum length of full-form thread of 1 in. 2) Sizes No.6 and smaller. Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 2 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall have a minimum length of full-form thread of 1.5 in. unless otherwise specified.
⑤,"R'' In the recess size tabulation means regular depth recess, and "s" means short depth recess.
⑥,Machine Screw Material
1)non-heat-treated low carbon steel, such as1006 through 1038
2)When hardened machine screw are specified, they shall be made from low or medium carbon steel, such as 1018 through 1038, with or without boron, through-hardened to Rockwell C25-38

Alternative history

ANSI/ASME B 18.6.3 - 2010 ASME B 18.6.3T2-III - 2013
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