Click Specification

82° Slotted Flat Coutersunk Head Tapping Screws - Type AB (ABR)

ASME B 18.6.3 (H1A+T1A) - 2024

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Thread Size
d

10#

12#

d	Nominal Size
Series ^③	Symbol
L ^②	Type A & Type AB
L ^②	Other Types
d_k	max
d_k	min
k	Ref
n	max
n	min
t	max
t	min
α	min=nominal size
α	max

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
0.023	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
0.015	0.019	0.023	0.027	0.030	0.034	0.038	0.041	0.045	0.053	0.060
0.010	0.012	0.015	0.017	0.020	0.022	0.024	0.027	0.029	0.034	0.039
80°	80°	80°	80°	80°	80°	80°	80°	80°	80°	80°
82°	82°	82°	82°	82°	82°	82°	82°	82°	82°	82°

Thread Size
d

14#

1/4

16#

18#

5/16

20#

24#

3/8

7/16

1/2

d	Nominal Size
Series ^③	Symbol
L ^②	Type A & Type AB
L ^②	Other Types
d_k	max
d_k	min
k	Ref
n	max
n	min
t	max
t	min
α	min=nominal size
α	max

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
0.075	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
0.068	0.070	0.075	0.083	0.088	0.090	0.105	0.106	0.103	0.103
0.044	0.046	0.049	0.054	0.058	0.059	0.069	0.070	0.066	0.065
80°	80°	80°	80°	80°	80°	80°	80°	80°	80°
82°	82°	82°	82°	82°	82°	82°	82°	82°	82°

①,Edge of head may be rounded or flat.
②,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.
③,Applicable to screw types as indicated below:
● 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 4.1.2.2-1]; and Type TRS thread-rolling ,see table [Table 4.1.3-1]

Alternative history

ASME/ANSI B 18.6.3 - 2010 ASME B 18.6.3T1+T40 - 2013 ASME B 18.6.3H1A+T1A - 2024

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Similar Standards

1	[DIN] DIN 7972 - 1990	Slotted Countersunk Head Tapping Screws View Suppliers
2	[DIN EN ISO] DIN EN ISO 1482 - 2011	Slotted Countersunkhead Tapping Screws View Suppliers
3	[ISO] ISO 1482 - 1983	Slotted Countersunk Head Tapping Screws
4	[ASME/ANSI] ASME/ANSI B 18.6.3 - 2010	80° Machine Screw and Tapping Screw Nuts (Inch Seires)
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13	[ASME] ASME B 18.6.5M (T8) - 2000 (R2010)	Metric Slotted Countersunk Head Tapping Screws [Table 8]
14	[IFI] IFI 502 - 1982	Metric Slotted Countersunk Head Tapping Screws
15	[ASME] ASME B 18.6.3 (T9+T40) - 2013	82° Slotted Undercut 82-deg Flat Countersunk Head Tapping Screws [Table 9]
16	[ASME] ASME B 18.6.3 (T1+T40) - 2013	82° Slotted Flat Coutersunk Head Tapping Screws - Type AB (ABR) [Table 1+Table 40]
17	[ASME] ASME B 18.6.4 - 1998 (R2005)	Slotted Flat Countersunk Head Tapping Screws - Type C
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19	[ASME] ASME B 18.6.4 - 1998 (R2005)	Slotted Undercut Flat Countersunk Head Tapping Screws - Type B and BP Thread Forming [Table 13]
20	[JIS] JIS B 1115 (T2) - 1996	Slotted Countersunk Head Tapping Screws [Table 2]
21	[JIS] JIS B 1115 (T6) - 2015	Slotted Countersunk Head Tapping Screws [Table 6]
22	[JIS] JIS B 1115 (AT2) - 1996	Slotted Countersunk Head Tapping Screws [Annex Table 2]
23	[JIS] JIS B 1115 (JA4) - 2015	Slotted Countersunk Head Tapping Screws [Table JA3]
24	[GB] GB /T 5283 - 1985	Slotted Countersunk Head Tapping Screws
25	[BS] BS 4174 - 1972	Slotted 80°countersunk Head Self-Tapping Screws [Table 8]
26	[BS] BS 4174 - 1972	Slotted 80° Truncated Countersunk Head Screws [Table 10]
27	[GB] GB /T 5283 - 2017	Slotted Countersunk（Flat）Head Tapping Screws
28	[NF] NF E 25-660 - 1994	Slotted Countersunk Head Tapping Screws
29	[AS] AS /NZS 4404 - 1996	ISO Metric Slotted Countersunk Head Tapping Screws
30	[CNS] CNS 4303 - 2000	Slotted Countersunk Head Tapping Screws