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82° Flat Coutersunk Trim head Screws [Table 13] (ASTM F837 / F468)

ASME B 18.6.3 (T13) - 2013

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Thread Size
d

4#
(3)

5#
(4)

6#
(4)

6#
(5)

8#
(5)

8#
(6)

10#
(8)

12#
(8)

Code	Head Size
d	Nominal Size
PP
d_s	max
	min
	Type A)	min
	Other types	min
d_k	max
	min
k	Ref
L₁	min
α	max
	min
Socket No.
M₁	Ref.
M₂	Ref.
P	Type I	max
		min
	Type IA	max
		min

3	4	4	5	5	6	8	8
0.1120	0.1250	0.1380	0.1380	0.1640	0.1640	0.1900	0.2160
40	40	32	32	32	32	24	24
0.112	0.125	0.138	0.138	0.164	0.164	0.190	0.216
0.106	0.119	0.131	0.131	0.157	0.157	0.181	0.207
0.105	0.118	0.131	0.131	0.157	0.157	0.183	0.209
0.106	0.119	0.131	0.131	0.157	0.157	0.181	0.207
0.187	0.212	0.212	0.237	0.237	0.262	0.312	0.312
0.167	0.191	0.191	0.215	0.215	0.238	0.285	0.285
0.052	0.060	0.052	0.068	0.052	0.069	0.085	0.069
0.062	0.062	0.062	0.062	0.062	0.062	0.062	0.062
82°	82°	82°	82°	82°	82°	82°	82°
80°	80°	80°	80°	80°	80°	80°	80°
1	1	1	2	2	2	2	2
0.100	0.122	0.122	0.148	0.158	0.176	0.182	0.192
0.100	0.122	0.122	0.148	0.158	0.176	0.182	0.192
0.061	0.082	0.082	0.075	0.085	0.103	0.110	0.120
0.045	0.066	0.066	0.052	0.062	0.080	0.087	0.097
0.058	0.079	0.079	0.071	0.081	0.099	0.107	0.117
0.042	0.063	0.063	0.053	0.063	0.081	0.089	0.099

Thread Size
d

12#
(10)

14#
(10) ^④

14#
(12) ^④

1/4
(10)

1/4
(12)

5/16
(12)

5/16
(1/4)

3/8
(5/16)

Code	Head Size
d	Nominal Size
PP
d_s	max
	min
	Type A)	min
	Other types	min
d_k	max
	min
k	Ref
L₁	min
α	max
	min
Socket No.
M₁	Ref.
M₂	Ref.
P	Type I	max
		min
	Type IA	max
		min

10	10	12	10	12	12	1/4	5/16
0.2160	0.2420	0.2420	0.2500	0.2500	0.3125	0.3125	0.3750
24	/	/	20	20	18	18	16
0.216	/	/	0.250	0.250	0.312	0.312	0.375
0.207	/	/	0.240	0.240	0.302	0.302	0.364
0.209	0.235	0.235	/	/	/	/	/
0.207	/	/	0.240	0.240	0.302	0.302	0.364
0.362	0.362	0.412	0.362	0.412	0.412	0.477	0.597
0.333	0.333	0.380	0.333	0.380	0.380	0.442	0.556
0.101	0.080	0.112	0.080	0.112	0.075	0.116	0.155
0.062	0.062	0.062	0.062	0.062	0.062	0.062	0.062
82°	82°	82°	82°	82°	82°	82°	82°
80°	80°	80°	80°	80°	80°	80°	80°
2	2	3	2	3	3	3	4
0.198	0.198	0.262	0.198	0.262	0.262	0.276	0.358
0.198	0.198	0.262	0.198	0.262	0.262	0.276	0.358
0.125	0.125	0.139	0.125	0.139	0.139	0.154	0.196
0.102	0.102	0.116	0.102	0.116	0.116	0.131	0.174
0.122	0.122	0.136	0.122	0.136	0.136	0.151	0.193
0.104	0.104	0.118	0.104	0.118	0.118	0.133	0.175

①,Edge of head may be rounded or flat.
②,Short machine screws include nominal lengths up to and including 1 1/8 in. for sizes No.5 and smaller, and 2 in. for sizes No.6 and larger.
③,Short tapping screws are those threaded full length. Refer to para. 4.3 for applicable screw lengths.
④,Size 14 is for tapping screws only.
⑤,Maximum diameter shall not exceed minimum plus 0.011 in. for Type A tapping screws, and basic screw diameter for all other tapping screw types.
⑦,Machine Screw Length of Thread

1) Sizes No.5 and smaller.

Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 1-1/8 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall, unless otherwise specified, have a minimum length of full-form thread of 1 in.

2) Sizes No.6 and smaller.

Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 2 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall have a minimum length of full-form thread of 1.5 in. unless otherwise specified.

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