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ASME B 18.6.3 (H1B-III+T1A) - 2024 Square Recessed Countersunk Head Screws (ASTM F837, F468)


Unit:
Thread Size
d
2# 3# 4#
d Nominal Size
PP
dk max
min
k Ref
M Ref
P max
min
Socket No.
α max
min
L0 Nominal Size
Y Fully Threaded max
b Thread Length (Long screws) min
0.0860 0.0990 0.1120
32 28 24
0.162 0.187 0.212
0.144 0.167 0.191
0.051 0.059 0.067
0.050 0.070 0.070
0.033 0.038 0.038
0.028 0.028 0.028
00 0 0
82° 82° 82°
80° 80° 80°
5/8 3/4 13/16
0.031 0.036 0.042
0.520 0.590 0.670
①,Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.
②,No extrusion of excess metal beyond the apex of the point resulting from thread rolling shall be permissible . A slight rounding or truncation of the point is desirable.
③,The width of flat at crest of thread shall not exceed 0.004 in. for sizes up to and including No. 8, and 0.006 in. for larger sizes.
④,For screws of norminal lengths equal to or shorter than the nominal screw lengths, L0, listed in Table, the full-form threads shall extend close to the head such that the minor diamter limits of the specified thread are maintained to within Y daistance from the underside of the head, or closer if practicable. Screws of nominal lengths, L0, longer than those tabulated in table shall have a minimum length of full-form thread as shown in the "b Min" column of table, unless otherwise specified by the purchaser.
Alternative history ASME B 18.6.3T2-III+T40 - 2013 ASME B 18.6.3H1B-III+T1A - 2024

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