ASME B 18.6.3 (T31-I+T40) - 2013 Recess Dimensions for Type I Nonindented Regular and Large Hex Head Tapping Screws - Type AB and ABR - 易紧通

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Unit:

Thread Size
d

8#

10#

12#

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 ^④		Nominal
Y ^④		Fully Threaded	max
b ^④		Thread Length (Long screws)	min

0.1640	0.1900	0.2160
18	16	14
0.183	0.198	0.262
2	2	3
0.110	0.125	0.139
0.087	0.102	0.116
0.250	0.312	0.312
0.244	0.305	0.305
0.312	/	0.375
0.305	/	0.367
0.272	0.340	0.340
0.340	/	0.409
0.110	0.120	0.155
0.096	0.105	0.139
1-1/4	1-3/8	1-5/8
0.056	0.062	0.071
0.980	1.140	1.300

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.

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