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Hexalobular Socket Hex Head with Type AB and ABR Thread-Forming Tapping Screws [Table 30&40]

ASME B 18.6.3 (T30-VI+T40) - 2013

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美标ASME B18.6.3 (T30-VI+T40) - 2013 ASME1 Hexalobular Socket Hex Head with Type AB and ABR Thread-Forming Tapping Screws [Table 30&40]
Thread Size
4# 5# 6# 7# 8# 10# 12# 1/4 5/16 3/8
d Nominal Size
PP
M Ref.
Socket No.
P max
min
s1 Regular Head max
min
s2 Large Head max
min
e1 Regular Head min
e2 Large Head min
k max
min
L0 Nominal
Y Fully Threaded max
b Thread Length (Long screws) min
0.1120 0.1250 0.1380 0.1510 0.1640 0.1900 0.2160 0.2500 0.3125 0.3750
24 20 20 19 18 16 14 14 12 12
0.111 0.111 0.132 0.132 0.155 0.178 0.200 0.221 0.266 0.312
T10 T10 T15 T15 T20 T25 T27 T30 T40 T45
0.040 0.050 0.051 0.051 0.065 0.080 0.080 0.095 0.125 0.155
0.035 0.040 0.040 0.040 0.050 0.065 0.065 0.080 0.100 0.125
0.188 0.188 0.250 0.250 0.250 0.312 0.312 0.375 0.500 0.562
0.181 0.181 0.244 0.244 0.244 0.305 0.305 0.367 0.489 0.551
0.219 0.250 / / 0.312 / 0.375 0.438 / /
0.213 0.244 / / 0.305 / 0.367 0.428 / /
0.202 0.202 0.272 0.272 0.272 0.340 0.340 0.409 0.545 0.614
0.238 0.272 / / 0.340 / 0.409 0.477 / /
0.060 0.070 0.093 0.093 0.110 0.120 0.155 0.190 0.230 0.295
0.049 0.058 0.080 0.080 0.096 0.105 0.139 0.172 0.208 0.270
13/16 15/16 1 1-1/8 1-1/4 1-3/8 1-5/8 1-13/16 1-13/16 1-7/8
0.042 0.050 0.050 0.053 0.056 0.062 0.071 0.071 0.083 0.083
0.670 0.750 0.830 0.910 0.980 1.140 1.300 1.500 1.500 1.500
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.
⑤,A slight rounding of all edges and comers of the hex surfaces of indented hex heads shall be permissible, provided the diameter of the bearing circle is equal to no less than 90% of the specified minimum width-across-flats dimension.

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