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Oval 82-deg Countersunk Trim Head Screws [Table 15] (ASTM F837 / F468)

ASME B 18.6.3 (T15) - 2013

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美标ASME B18.6.3 (T15) - 2013 ASME18.6.3 1 Oval 82-deg Countersunk Trim Head Screws [Table 15] (ASTM F837 / F468)
Thread Size
d
4#
(3)
5#
(4)
6#
(4)
6#
(5)
8#
(5)
8#
(6)
10#
(8)
12#
(8)
d Nominal Size
PP
Code Head Size
ds max
min
Type A min
Other types min
dk max
min
k Ref
f Ref.
R Ref.
L1 min
α max
min
Socket No.
M1 short Ref.
Long Ref.
M2 short Ref.
Long Ref.
P short, Type I max
min
Long, Type I max
min
short, Type IA max
min
Long, Type IA max
min
0.1120 0.1250 0.1380 0.1380 0.1640 0.1640 0.1900 0.2160
40 40 32 32 32 32 24 24
3 4 4 5 5 6 8 8
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
0.057 0.066 0.058 0.075 0.060 0.076 0.094 0.078
0.033 0.037 0.037 0.041 0.041 0.045 0.076 0.076
0.014 0.017 0.017 0.019 0.019 0.021 0.025 0.025
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
0.118 0.130 0.130 0.152 0.152 0.172 0.186 0.186
0.118 0.130 0.130 0.162 0.162 0.188 0.200 0.200
0.118 0.130 0.130 0.152 0.152 0.172 0.186 0.186
0.118 0.130 0.130 0.162 0.162 0.188 0.200 0.200
0.074 0.087 0.087 0.074 0.074 0.094 0.108 0.108
0.057 0.070 0.070 0.050 0.050 0.069 0.084 0.084
0.074 0.087 0.087 0.085 0.085 0.110 0.124 0.124
0.057 0.070 0.070 0.061 0.061 0.085 0.099 0.099
0.074 0.086 0.086 0.074 0.074 0.093 0.108 0.108
0.058 0.070 0.070 0.056 0.056 0.075 0.090 0.090
0.074 0.086 0.086 0.084 0.084 0.109 0.122 0.122
0.058 0.070 0.070 0.066 0.066 0.091 0.104 0.104
Thread Size
d
12#
(10)
14#
(10)
14#
(12)
1/4
(10)
1/4
(12)
5/16
(12)
5/16
(5/16)
3/8
(3/8)
d Nominal Size
PP
Code Head Size
ds max
min
Type A min
Other types min
dk max
min
k Ref
f Ref.
R Ref.
L1 min
α max
min
Socket No.
M1 short Ref.
Long Ref.
M2 short Ref.
Long Ref.
P short, Type I max
min
Long, Type I max
min
short, Type IA max
min
Long, Type IA max
min
0.2160 0.2420 0.2420 0.2500 0.2500 0.3125 0.3125 0.3750
24 / / 20 20 18 18 16
10 10 12 10 12 12 5/16 3/8
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
0.111 0.091 0.124 0.091 0.124 0.087 0.130 0.173
0.060 0.060 0.068 0.060 0.068 0.068 0.079 0.099
0.029 0.029 0.033 0.029 0.033 0.033 0.038 0.048
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
0.202 0.202 0.264 0.202 0.264 0.264 0.284 0.384
0.214 0.214 0.264 0.214 0.264 0.264 0.264 0.384
0.202 0.202 0.264 0.202 0.264 0.264 0.284 0.384
0.214 0.214 0.264 0.214 0.264 0.264 0.284 0.384
0.126 0.126 0.126 0.126 0.135 0.135 0.156 0.218
0.102 0.102 0.102 0.102 0.111 0.111 0.131 0.194
0.137 0.137 0.135 0.137 0.135 0.135 0.156 0.218
0.112 0.112 0.111 0.112 0.111 0.111 0.131 0.194
0.125 0.125 0.135 0.125 0.135 0.135 0.155 0.215
0.107 0.107 0.117 0.107 0.117 0.117 0.137 0.197
0.136 0.136 0.135 0.136 0.135 0.135 0.155 0.215
0.118 0.118 0.117 0.118 0.117 0.117 0.137 0.197
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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