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Cross recessed raised countersunk head tapping screws - Type AB and ABR

ASME B 18.6.3 (T8-I/T8-IA+T40) - 2013

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Thread Size
d

d	Nominal Size
PP
Socket No.
M₁	Ref.
M₂	Ref.
P	Type I	max
		min
	Type IA	max
		min
d_k	max
	min
k	Ref.
f	Ref.
α	max
	min
L₀ ^④	Nominal
Y ^④	Fully Threaded	max
b ^④	Thread Length (Long screws)	min

0.0600	0.0730	0.0860	0.0990	0.1120	0.1250	0.1380	0.1510
48	42	32	28	24	20	20	19
0	0	1	1	1	2	2	2
0.068	0.070	0.106	0.118	0.130	0.152	0.172	0.176
0.068	0.070	0.106	0.118	0.130	0.152	0.172	0.176
0.038	0.041	0.062	0.074	0.087	0.074	0.094	0.100
0.020	0.023	0.045	0.057	0.070	0.050	0.069	0.075
0.042	0.043	0.062	0.074	0.086	0.074	0.093	0.099
0.024	0.027	0.046	0.058	0.070	0.056	0.075	0.081
0.112	0.137	0.162	0.187	0.212	0.237	0.262	0.287
0.096	0.120	0.144	0.167	0.191	0.215	0.238	0.262
0.035	0.043	0.051	0.059	0.067	0.075	0.083	0.091
0.021	0.025	0.029	0.033	0.037	0.041	0.045	0.049
82°	82°	82°	82°	82°	82°	82°	82°
80°	80°	80°	80°	80°	80°	80°	80°
7/16	9/16	5/8	3/4	13/16	15/16	1	1-1/8
0.021	0.024	0.031	0.036	0.042	0.050	0.050	0.053
0.360	0.440	0.520	0.590	0.670	0.750	0.830	0.910

Thread Size
d

10#

12#

1/4

5/16

3/8

7/16

1/2

d	Nominal Size
PP
Socket No.
M₁	Ref.
M₂	Ref.
P	Type I	max
		min
	Type IA	max
		min
d_k	max
	min
k	Ref.
f	Ref.
α	max
	min
L₀ ^④	Nominal
Y ^④	Fully Threaded	max
b ^④	Thread Length (Long screws)	min

0.1640	0.1900	0.2160	0.2500	0.3125	0.3750	0.4375	0.5000
18	16	14	14	12	12	10	10
2	2	3	3	4	4	4	4
0.186	0.202	0.264	0.284	0.384	0.404	0.416	0.430
0.186	0.202	0.264	0.284	0.384	0.404	0.416	0.430
0.108	0.126	0.135	0.156	0.218	0.237	0.249	0.263
0.084	0.102	0.111	0.131	0..194	0.213	0.225	0.239
0.108	0.125	0.135	0.155	0.215	0.235	0.247	0.262
0.090	0.107	0.117	0.137	0.197	0.217	0.229	0.244
0.312	0.362	0.412	0.477	0.597	0.717	0.760	0.815
0.285	0.333	0.380	0.442	0.556	0.670	0.715	0.765
0.100	0.116	0.132	0.153	0.191	0.230	0.223	0.223
0.052	0.060	0.068	0.079	0.099	0.117	0.122	0.131
82°	82°	82°	82°	82°	82°	82°	82°
80°	80°	80°	80°	80°	80°	80°	80°
1-1/4	1-3/8	1-5/8	1-13/16	1-13/16	1-7/8	1-7/8	1-7/8
0.056	0.062	0.071	0.071	0.083	0.083	0.100	0.100
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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