Click Specification

Hexalobular Socket Round Head Tapping Screws With Collar - Type AB and ABR

ASME B 18.6.3 (T39-VI+T40) - 2013

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Thread Size
d

10#

12#

1/4

5/16

3/8

7/16

1/2

d	Nominal Size
PP
M	Ref.
Socket No.
P	max
	min
d_k	Ref.
d_c	max
	min
k	max
	min
c	Ref.
L₀	Nominal
Y	Fully Threaded	max
b	Thread Length (Long screws)	min

0.0860	0.0990	0.1120	0.1250	0.1380	0.1510	0.1640	0.1900	0.2160	0.2500	0.3125	0.3750	0.4375	0.5000
32	28	24	20	20	19	18	16	14	14	12	12	10	10
0.081	0.094	0.111	0.111	0.132	0.132	0.155	0.178	0.200	0.221	0.266	0.312	0.352	0.446
T7	T8	T9	T10	T15	T15	T20	T25	T27	T30	T40	T45	T50	T55
0.035	0.035	0.040	0.045	0.060	0.070	0.065	0.075	0.080	0.090	0.120	0.130	0.150	0.170
0.030	0.030	0.035	0.035	0.050	0.060	0.050	0.060	0.065	0.075	0.105	0.115	0.135	0.155
0.136	0.156	0.177	0.198	0.218	0.238	0.259	0.300	0.341	0.396	0.494	0.593	0.691	0.790
0.202	0.232	0.261	0.291	0.321	0.350	0.380	0.439	0.498	0.576	0.719	0.861	1.004	1.146
0.186	0.215	0.243	0.272	0.301	0.330	0.358	0.416	0.473	0.548	0.687	0.825	0.963	1.101
0.062	0.070	0.079	0.088	0.096	0.105	0.113	0.130	0.148	0.170	0.211	0.253	0.294	0.335
0.050	0.058	0.067	0.075	0.084	0.092	0.101	0.118	0.134	0.157	0.197	0.238	0.278	0.319
0.030	0.030	0.030	0.040	0.040	0.040	0.040	0.050	0.050	0.050	0.060	0.060	0.070	0.090
5/8	3/4	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	1-7/8	1-7/8
0.031	0.036	0.042	0.050	0.050	0.053	0.056	0.062	0.071	0.071	0.083	0.083	0.100	0.100
0.520	0.590	0.670	0.750	0.830	0.910	0.980	1.140	1.300	1.500	1.500	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.

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