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Head Dimensions for 82° Flat Head Self-Tapping Screws - ANSI
Nominal Size
These Lengths or Shorter are Undercut Types A and AB
A
H
Head Dimensio s Diameter
J
T
Slot Dimensions
Height
Width
Depth
M
R
N
Phillips Dimensions Dia Depth Width
Other Max Min Ma x Min Max Min Max Min Ref Types
F
18.6.4 G
Protrusion Above Gaging Diameter
Ref
Ref
Max
Min
Gaging Diameter
Phillips Driver Size
0
3/16
1/8
.112 .096 .03
.026 .023 .016 .015 .010 .062
.035
.014
.026
.016
.078
0
1
3/16
5/32
.137 .120 .04
.033 .026 .019 .019 .012 .070
.043
.015
.028
.016
.101
0
2
3/16
3/16
.162 .144 .051 .040 .031 .023 .023 .015 .096
.055
.017
.029
.017
.124
1
4
1/4
1/4
.212 .191 .06
.055 .039 .031 .030 .020 .122
.081
.018
.032
.019
.172
1
5
1/4
1/4
.237 .215 .07
.062 .043 .035 .034 .022 .148
.074
.027
.034
.020
.196
2
6
5/16
5/16
.262 .238 .08
.069 .048 .039 .038 .024 .168
.094
.029
.036
.021
.220
2
7
3/8
3/8
.287 .262 .091 .076 .048 .039 .041 .027 .176
.102
.030
.037
.022
.243
2
8
7/16
7/16
.312 .285 .10
.084 .054 .045 .045 .029 .182
.110
.030
.039
.023
.267
2
10
1/2
1/2
.362 .333 .11
.098 .060 .050 .053 .034 .198
.124
.032
.042
.025
.313
2
12
9/16
9/16
.412 .380 .13
.112 .067 .056 .060 .039 .262
.144
.035
.045
.027
.362
3
14
5/8
-
.462 .427 .14
.126 .075 .064 .068 .044 .276
.160
.036
.049
.029
.410
3
1/4
5/8
5/8
.477 .442 .15
.131 .075 .064 .070 .046 .276
.160
.036
.050
.029
.424
3
5/16
13/16
5/8
.597 .556 .191 .165 .084 .072 .088 .058 .358
.205
.061
.057
.034
.539
4
3/8
-
5/8
.717 .670 .23
.234
.065
.065
.039
.653
4
.200 .094 .081 .106 .070 .386
Note: The length of a flathea screw is always measured by the total length of the screw, from the top of the head to the extreme end of the threads. Chipboard Screw , Sunta vidası , wood screw , ağ aç vidası , Confirmat Screw , Kabin vidası , square screw , kare vida
Head Dimensions for U dercut Flat Head Self Tapping Screws - AN I B18.6.4
Nominal Size
These Lengths or Shorter are Undercut Types A and AB
A
H
Head Dime sions Diameter
eight
J
T
Slot Dimensions Width
Depth
M
R
N
Recess Dimensions Dia
Other Max Min M x Min Max Min Max Min Ref Types
Depth Width
F
G
Protrusion Above Gagin Diameter
Ref
Ref
Max
Mi
Gaging Diameter
Phillips Driver Size
0
3/16
1/8
.112 .096 .0 5 .018 .023 .016 .011 .007 .069
.035
.014
-
-
-
0
1
3/16
5/32
.137 .120 .0 1 .023 .026 .019 .014 .009 .070
.043
.015
-
-
-
0
2
3/16
3/16
.162 .144 .0 6 .028 .031 .023 .016 .011 .088
.048
.017
.029
.017
.124
1
4
1/4
1/4
.212 .191 .0 7 .038 .039 .031 .022 .014 .110
.070
.018
.032
.019
.172
1
6
5/16
5/16
.262 .238 .0 9 .048 .048 .039 .027 .017 .140
.066
.025
.036
.021
.220
2
7
3/8
3/8
.287 .262 .0 4 .053 .048 .039 .030 .019 .148
.074
.027
.037
.022
.243
2
8
7/16
7/16
.312 .285 .0 0 .058 .054 .045 .032 .021 .168
.094
.029
.039
.02
.267
2
10
1/2
1/2
.362 .333 .0 1 .068 .060 .050 .037 .024 .182
.110
.030
.042
.025
.313
2
12
9/16
9/16
.412 .380 .0 2 .078 .067 .056 .043 .028 .226
.110
.030
.045
.027
.362
3
1/4
5/8
5/8
.477 .442 .1 7 .092 .075 .064 .050 .032 .244
.124
.032
.050
.029
.424
3
5/16
13/16
5/8
.597 .556 .1 4 .116 .084 .072 .062 .041 .310
.157
.053
.057
.03
.539
4
3/8
-
5/8
.717 .670 .1 1 .140 .094 .081 .075 .049 .358
.205
.061
.065
.039
.653
4
Note: The length of a flathea screw is always measured by the total length of the screw, the top of t e head to the extreme end of the threads.
Head Dimensions for Square Drive Flat Head Self Tapping Screws - IFI Nominal Size Or Basic Screw Diameter
A
M
T
F
Head Diameter
Recess Square
Recess Depth
Max
Min
Max
Min
Max
Min
Driver Size
Gauge Penetration
Max
Min
4
.1120
.212
.191
.071
.0696
.073
.063
0
.038
.032
6
.1380
.262
.238
.091
.090
.113
.105
1
.065
.057
8
.1640
.312
.285
.1126
.111
.140
.119
2
.075
.065
10
.1900
.362
.333
.1126
.111
.140
.119
2
.075
.065
12
.2160
.412
.380
.133
.1315
.165
.155
3
.095
.085
1/4
.2500
.477
.442
.133
.1315
.165
.155
3
.095
.085
5/16
.3125
.597
.556
.191
.1895
.201
.191
4
.100
.090
The recess has a square c nter opening, slightly tapered side walls and a conical bottom. Note: The length of a flat ead screw is always measured by the total length of t e screw, the top o f the head to the extreme end of the threads.
Head Dimensions for Torx® Drive Flat Head Self Tapping Screws - Camcar G
T
B
F
Maximum Pe netration Torx® Recess Gauge Head Diam ter Head Height Nominal Size Diameter Penetration of "No-Go" Driver Gauge Size Max Sharp Min Sh rp Abs Min Ref Ref Min ( allawat) 4
.225
.209
.195
.067
.094
.028
.019
T8
6
.279
.257
.244
.083
.111
.035
.022
T10
8
.332
.308
.282
.100
.132
.040
.026
T15
10
.385
.359
.340
.116
.155
.050
.031
T20
1/4
.507
.447
.452
.153
.200
.075
.040
T27
Square and Hex Machine Screw Nuts - ANSI/ASME B18.6. F Nominal Size or Basic Thread Diameter
G
Width Across Flats
H
Width Across Corners Square
Thickness
Hex
Basic
Max
Min
Max
Min
Max
Min
Max
Min
0
.060
5/32
.156
.150
.221
.206
.180
.171
.050
.043
1
.073
5/32
.156
.150
.221
.206
.180
.171
.050
.043
2
.0860
3/16
.188
.180
.265
.247
.217
.205
.066
.057
3
.0990
3/16
.188
.180
.265
.247
.217
.205
.066
.057
4
.1120
1/4
.250
.241
.354
.331
.289
.275
.098
.087
5
.1250
5/16
.312
.302
.442
.415
.361
.344
.114
.102
6
.1380
5/16
.312
.302
.442
.415
.361
.344
.114
.102
8
.1640
11/32
.344
.332
.486
.456
.397
.378
.130
.117
10
.1900
3/8
.375
.362
.530
.497
.433
.413
.130
.117
12
.2160
7/16
.438
.423
.619
.581
.505
.482
.161
.148
1/4
.2500
7/16
.438
.423
.619
.581
.505
.482
.193
.178
5/16
.3125
9/16
.562
.545
.795
.748
.650
.621
.225
.208
3/8
.3750
5/8
.625
.607
.884
.833
.722
.692
.257
.239
Square a d Hex Machine Screw Nuts Properties Description
Hex Machine Sc rew Nut: A six-sided internally threaded fastener with flat tops and chamfered corners. Threads are to be Unified Standard, clas 2B. Square MachineS rew Nut: A four-sided, internally threaded fatener wi th flat tops and bottoms an no chamfer. Threads are to be Unified Course threa class 2B
Appication & Advantaged
Hex Nut: Designe to be used specifically with machine screws. Stainles s nuts are used with stainless achine screws where parts are subject to corrosive en vironments. Squa e Nuts: Offers a greater bearing surface for wrenchi g.
Material
Steel: Any low carbon steel Stainless: 18-8 stainless steel
Plating
See plating page for plating information.
Small Pattern H ex Machine Screw Nuts - ANSI/ASME B18.6 .3 Nominal Size or Basic Thread Diameter
F
G
H
Width Across Flats
Width Across Corners
Thickness
Basic
Max
Min
Max
Min
ax
Min
4
.1120
3/16
.188
.180
.217
.205
.066
.057
6
.1380
1/4
.250
.241
.289
.275
.098
.087
8
.1640
1/4
.250
.241
.289
.275
.098
.087
10
.1900
5/16
.312
.302
.361
.344
.114
.102
Small Pattern Hex M chine Screw Nuts Properties - ANSI/ASME B18.6.3 Description
Similar in design to standard hex machine screw nuts but with smaller wi dths accross the flats and across the corners.
Applications Designed to be sed with machine screws in areas where there is limit ed space for & wrenching. Stainle s nuts are used with stainless machine screws where arts are subject Advantages to corrosive conditions. Material
Steel: Any low carbon steel Stainless: 18-8 stainless steel
Plating
See plating page for plating information.
Head Dimensions for an Head Machine Screws and SEMS - ANSI B18.6.3 A
H
H1
J
T
M
G
N
Phillips Slot Width Slot Depth Driver Slotted Recessed Diameter Depth Width Size Max Min Max Min Max Min Max Min Max Min Max Min Max Min
Nominal Head Size Diameter
Height o Head
Dimensions of ecess
0
.116 .104 .039 .031 .044 .036 .023 .016 .022 .014 .067 .054
.039
.013
0
2
.167 .155 .053 .045 .062 .053 .031 .023 .031 .022 .104 .091
.059
.017
1
3
.193 .180 .060 .051 .071 .062 .035 .027 .036 .026 .112 .099
.068
.019
1
4
.219 .205 .068 .058 .080 .070 .039 .031 .040 .030 .122 .109
.078
.019
1
5
.245 .231 .075 .065 .089 .079 .043 .035 .045 .034 .158 .145
.083
.028
2
6
.270 .256 .082 .072 .097 .087 .048 .039 .050 .037 .166 .153
.091
.028
2
8
.322 .306 .096 .085 .115 .105 .054 .045 .058 .045 .182 .169
.108
.030
2
10
.373 .357 .110 .099 .133 .122 .060 .050 .068 .053 .199 .186
.124
.031
2
12
.425 .407 .125 .1125 .151 .139 .067 .056 .077 .061 .259 .246
.141
.034
3
1/4
.492 .473 .144 .130 .175 .162 .075 .064 .087 .070 .281 .268
.161
.036
3
5/16
.615 .594 .178 .162 .218 .203 .084 .072 .106 .085 .350 .337
.193
.059
4
3/8
.740 .716 .212 .195 .261 .244 .094 .081 .124 .100 .389 .376
.233
.065
4
Combin tion Drive Pan Head Machine Screws G
H
Nominal Head Dimensions Screw Head Head Size Diameter Height
J
A
Slot Dimensions Width
Depth
M
T
N
Recess Dimensions Width
Depth
ecess Driver Wing Pe etration Size Depth
Max Min Max Min Max Min Max Min Max Min Max Min
Min
M x Min
4
.219 .205 .080 .070 .039 .031 .040 .030 .122 .109 .078 .060
.019
.071
.053
1
6
.270 .256 .097 .087 .048 .039 .050 .037 .166 .153 .091 .066
.028
.0 0
.055
2
8
.322 .306 .115 .105 .054 .045 .058 .045 .182 .169 .108 .082
.030
.097
.071
2
10
.373 .357 .133 .122 .060 .050 .068 .053 .199 .186 .124 .100
.031
.113
.089
2
12
.425 .407 .125 .112 .067 .056 .077 .061 .259 .246 .141 .115
.034
.124
.098
3
1/4
.492 .473 .175 .162 .075 .064 .087 .070 .281 .268 .161 .135
.036
.1 4
.118
3
5/16
.615 .594 .218 .203 .084 .072 .106 .085 .350 .337 .193 .169
.059
.173
.149
4
Torx® Drive Pan Head Machine Screws - Camcar D Screw Size
H
R
Head Dimensi ns
G Recess Dimensions
Head Diameter
Head Height
Max
Min
Max
2
.167
.155
4
.219
6
Driver Size
Min
Diameter (Ref)
Gauge Penetration (Min)
Maxi um Penetr tion (Fallo ay)
.062
.053
.094
.030
.02
T8
.205
.080
.070
.111
.035
.02
T10
.270
.256
.097
.087
.132
.045
.03
T15
8
.322
.306
.115
.105
.155
.055
.03
T20
10
.373
.357
.133
.122
.178
.070
.04
T25
1/4
.492
.473
.175
.162
.221
.085
.04
T30
5/16
.615
.594
.218
.203
.266
.105
.04
T40
Torx® is a registered trade ark of the Camcar Corporation, division of Textron Industries.
Pozidrive® (Type 1 ) Pan Head Machine Screws - ASME B18.6. 1998 1998 Screw Size
A
H
M
Head Diameter
Head Height
G
N
Recess Dimensions Diameter
Depth
Width
Re ess Penet ation Gaging De th
Driver Size
Max
Min
Max
Min
Max
Min
Max
Min
Min
Max
Min
2
.167
.155
.062
.053
.104
.091
.064
.048
.028
.053
.037
1
4
.219
.205
.080
.070
.122
.109
.083
.067
.029
.072
.056
1
6
.270
.256
.097
.087
.162
.149
.092
.074
.040
.076
.058
2
8
.322
.306
.115
.105
.177
.164
.108
.090
.041
.092
.074
2
10
.373
.357
.133
.122
.193
.180
.125
.106
.041
.108
.090
2
12
.425
.407
.151
.139
.254
.241
.139
.121
.056
.117
.099
3
1/4
.492
.473
.175
.162
.273
.260
.159
.141
.057
.137
.119
3
Pozidriv® is a trademark of he Phillips Screw Company. Our fasteners with the 1 A-drive are not manufactured by or connected with the producers of Pozidriv® fasten rs.
Square ocket Pan Head Machine Screws - IFI Nominal Size or Basic Screw Diameter
A
H
M
T
Head Diameter
H ad Height
Recess Square
Recess Depth
Penet ation Gaging Depth
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Driver Size
4
.112
.219
.205
.086
.075
.071
.0696
.073
.063
.038
.032
0
6
.138
.270
.256
.103
.091
.091
.090
.113
.105
.065
.057
1
8
.164
.322
.306
.120
.107
.1126
.111
.140
.119
.075
.065
2
10
.1900
.373
.357
.137
.123
.1126
.111
.140
.119
.075
.065
2
12
.2160
.425
.407
.153
.139
.133
.1315
.165
.155
.095
.085
3
1/4
.2500
.492
.473
.175
.160
.133
.1315
.165
.155
.095
.085
3
5/16 .3125
.615
.594
.216
.198
.191
.1895
.201
.191
.100
.090
4
Square Socket type of recess h s a square center opening, with slightly tapered sides and a conical bottom.
MACHINE SCREWS Description
MATERIAL
SIZES
Pan ead Combi ation Machin Screw
Zinc Plated Steel
4-40x1/8 thr 1/4-20x4
Round Head Combi ation Machin Screw
Zinc Plated Steel
6-32x2 thru 1/4-20x4
Truss Head Combi ation Machin Screw
Zinc Plated Steel
6-32 thru 1/4-20
Flat ead Phillips Machin Screw
Zinc Plated Steel
2-56x1/8 th u 1/2-13
Unde rcut Flat ead Phillips Machin Screw
Zinc Plated Steel
2-56x1/8 th u 3/8-16
Flat ead 10 ° Phillips Machin Screw
Zinc Plated Steel
2-56x1/8 thru 1 /4-20x1-1/2
Filliste Head Phillips Machin Screw
Zinc Plated Steel
2-56x1/8 thru 5/16-18x2
Oval ead Phillips Machin Screw
Zinc Plated Steel
4-40x1/4 thr 1/4-20x3
Pan ead Phillips Machin Screw
Zinc Plated Steel
2-56x1/8 thr 3/8-16x3
Round Head Phillips Machin Screw
Zinc Plated Steel
2-56x1/4 th u 3/8-16
Truss Head Phillips Machin Screw
Zinc Plated Steel
4-40x3/16 thru /8-16x2-1/4
Indented Hex Washe Head Phillips Machin Screw
Zinc Plated Steel
4-40x1/4 thr 1/4-20x1
Binding ndercut Slotted Head Machin Screw
Zinc Plated Steel
2-56x1/8 thru 1 /4-20x1-1/4
Flat ead Slot ed Machin Screw
Zinc Plated Steel
2-56x1/8 thr 1/2-13x6
Unde rcut Flat ead Slot ed Machin Screw
Zinc Plated Steel
2-56x1/8 thru 3/8-16x1/2
Filliste Head Slot ed Machin Screw
Zinc Plated Steel
2-56x1/8 thru /8-16x1-1/4
Oval ead Slot ed Machin Screw
Zinc Plated Steel
4-40x1/4 thr 1/4-20x2
Pan ead Slot ed Machin Screw
Zinc Plated Steel
2-56x1/8 thr 3/8-16x3
Round Head Slot ed Machin Screw
Zinc Plated Steel
2-56x1/8 thr 1/2-13x6
Truss Head Slot ed Machin Screw
Zinc Plated Steel
4-40x1/4 th u 1/2-13
Inde Hex Slot Machin
ted ead ed Screw
Zinc Plated Steel
4-40x1/4 th u 3/8-16
Inde ted Hex ead Unslo tted Machin Screw
Zinc Plated Steel
4-40x1/4 th u 3/8-16
Inde ted Hex Washer Slot ed Grounding Screw
Green Zinc Plated Steel
10-32x3/8 and 10-32x1/2
Inde ted Hex Washer Slot ed Grounding Screw
Zinc Plated Steel
4-40x1/4 thru /8-16x2-1/2
Inde ted Hex Washer Slotted Machine Screw
Zinc Plated Steel
4-40x1/4 thru 3 /8-16x2-1/2
Inde ted Hex Washer Unslotted Machine Screw
Zinc Plated Steel
4-40x1/4 thru 3/8-16x2
Zinc Plated Steel
4-40x1/4 thru 1/4-20x2
Pan ead Torx® Drive Machine Screw
Zinc Plated Steel
2-56x3/16 thr 1/4-20x2
Pan ead Phillips Shakeproof® Square Con ® Washer Sems Machine Screw
Screw is Zinc Plated Steel Baked After Plating
4-40x1/4 thru 10-32x3/4
Flat ead Torx® Drive Machine Screw
Pan ead Phillips Split Lock Washer Sems Machine Screw
Screw is Zinc Plated Steel Baked After Plating
4-40x1/4 thru 1/4-20
Pan ead Phillips Externall Sems Machine Screw
Screw is Zinc Plated Steel Baked After Plating
4-40x3/16 thru 1 /4-20x1-1/4
Pan ead Phillips Internal Sems Machine Screw
Screw is Zinc Plated Steel Baked After Plating
23-56x1/8 thr 1/4-20x1
Pan ead Slotted Externall Sems Machine Screw
Screw is Zinc Plated Steel Baked After Plating
4-40x3/16 thru 1 /4-20x1-1/4
Pan ead Slotted Internal Sems Machine Screw
Screw is Zinc Plated Steel Baked After Plating
4-40x1/4 thr 10-32x1
Flat ead Phillips Machine Screw
Black Oxide Plated Steel
2-56x1/8 thru 1/4-20x2
Pan ead Phillips Machine Screw
Black Oxide Plated Steel
2-56x1/8 thru 1/4-20x2
Sources for documentation
Smith Fasteners