Click Specification

82° Dimensions of Slotted Oval Countersunk Head Tapping Screws

ASME B 18.6.3 (H2A+T1A) - 2024

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Thread Size
d

10#

12#

d	Nominal Size
Series ^②	Symbol
L ^③	Type A & Type AB
L ^③	Other Types
d_k	max
d_k	min
k	Ref
f	Ref.
n	max
n	min
t	max
t	min

0.0600	0.0730	0.0860	0.0990	0.1120	0.1250	0.1380	0.1510	0.1640	0.1900	0.2160
●◆▲	●◆▲	●◆▲■	●◆▲■	●◆▲■	●◆▲■	●◆▲■	●◆▲	●◆▲■	●◆▲■	●◆▲■
3/16	3/16	3/16	7/32	1/4	1/4	5/16	3/8	7/16	1/2	9/16
1/8	5/32	3/16	7/32	1/4	1/4	5/16	3/8	7/16	1/2	9/16
0.112	0.137	0.162	0.187	0.212	0.237	0.262	0.287	0.312	0.362	0.412
0.096	0.120	0.144	0.167	0.191	0.215	0.238	0.262	0.285	0.333	0.380
0.035	0.043	0.051	0.059	0.067	0.075	0.083	0.091	0.100	0.116	0.132
0.021	0.025	0.029	0.033	0.037	0.041	0.045	0.049	0.052	0.060	0.068
0.023	0.026	0.031	0.035	0.039	0.043	0.048	0.048	0.054	0.060	0.067
0.016	0.019	0.023	0.027	0.031	0.035	0.039	0.039	0.045	0.050	0.056
0.030	0.038	0.045	0.052	0.059	0.067	0.074	0.081	0.088	0.103	0.117
0.025	0.031	0.037	0.043	0.049	0.055	0.060	0.066	0.072	0.084	0.096

Thread Size
d

14#

1/4

16#

18#

5/16

20#

24#

3/8

7/16

1/2

d	Nominal Size
Series ^②	Symbol
L ^③	Type A & Type AB
L ^③	Other Types
d_k	max
d_k	min
k	Ref
f	Ref.
n	max
n	min
t	max
t	min

0.2420	0.2500	0.2680	0.2940	0.3125	0.3200	0.3720	0.3750	0.4375	0.5000
◆	●▲■	◆	◆	●▲■	◆	◆	●▲■	●▲■	●▲■
5/8	5/8	3/4	13/16	13/16	13/16	1	/	/	/
/	5/8	/	/	5/8	/	/	5/8	3/4	3/4
0.462	0.477	0.512	0.561	0.597	0.611	0.711	0.717	0.760	0.815
0.427	0.442	0.475	0.522	0.556	0.569	0.664	0.670	0.715	0.765
0.148	0.153	0.164	0.180	0.191	0.196	0.228	0.230	0.223	0.223
0.076	0.079	0.084	0.092	0.099	0.100	0.116	0.117	0.122	0.131
0.075	0.075	0.075	0.084	0.084	0.084	0.094	0.094	0.094	0.106
0.064	0.064	0.064	0.072	0.072	0.072	0.081	0.081	0.081	0.091
0.132	0.136	0.146	0.160	0.171	0.175	0.204	0.206	0.210	0.216
0.108	0.112	0.120	0.132	0.141	0.144	0.168	0.170	0.174	0.176

①,Edge of head may be rounded or flat.
②,● Type AB thread-forming , see table [[Table 4.1.1.1-1]
◆ Type A thread-forming, see table [Table 4.1.1.4-1]
▲ Type B and BP thread forming, see table [Table 4.1.1.2-1]; Type BF and BT thread cutting, see table [Table 4.1.2.1-1]
■ Type C thread forming, see table [Table VI-1]; Type D, F, G and T thread cutting, see table [Table 44]; and Type TRS thread-rolling ,see table [Table 4.1.2.2-1]
③,Screws of these lengths and shorter shall have undercut heads. For tapping screws, use Type AB undercut head screws in place of Type A screws for these lengths and shorter.

Alternative history

ASME/ANSI B 18.6.3 - 2010 ASME B 18.6.3T7+T40 - 2013 ASME B 18.6.3H2A+T1A - 2024

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