Tamper-Pruf Screws

 

 

We have tables of weights and dimensions ...

Screw Weights
Screw Dimensions
Socket Dimensions
Key Dimensions

 

 

 

 

 

 

 

 

Weights of Machine Screws and Tapping Screws
(Approximate weight of 100 steel screws, in pounds)

Screw Size 2-56 3-48 4-40 5-40 6-32 8-32 10-24 10-32 12-24 1/4-20 5/16-18 3/8-16
Length
(inches)
3/16 .05 .07 .09 .12 .15 .25 .38 .39 - - - -
1/4 .06 .08 .10 .14 .17 .28 .41 .43 .56 .85 - -
5/16 .06 .09 .12 .15 .19 .31 .44 .46 .61 .91 1.67 -
3/8 .07 .09 .13 .17 .21 .34 .48 .50 .65 .98 1.77 2.92
7/16 .08 .10 .15 .19 .22 .36 .51 .54 .69 1.04 1.88 3.07
1/2 .08 .11 .16 .20 .24 .39 .54 .58 .74 1.11 1.98 3.22
9/16 .09 .12 .17 .22 .26 .42 .58 .62 .78 1.17 2.09 3.36
5/8 .10 .13 .18 .23 .28 .45 .62 .66 .83 1.24 2.19 3.51
3/4 .11 .15 .21 .26 .32 .50 .69 .73 .92 1.36 2.40 3.80
7/8 .13 .17 .23 .30 .35 .56 .76 .81 1.01 1.49 2.61 4.10
1 .14 .19 .25 .34 .39 .62 .83 .89 1.10 1.61 2.82 4.40
1 1/8 - - .28 .38 .43 .67 .90 .96 1.19 1.74 3.02 4.70
1 1/4 - - .30 .41 .46 .73 .97 1.04 1.28 1.87 3.23 4.98
1 1/2 - - .35 .47 .53 .83 1.11 1.19 1.47 2.12 3.65 5.58
1 3/4 - - - .53 .61 .94 1.25 1.35 1.65 2.37 4.07 6.17
2 - - - .60 .68 1.06 1.38 1.50 1.83 2.62 4.48 6.76
2 1/4 - - - - .76 1.18 1.52 1.66 2.01 2.88 4.90 7.35
2 1/2 - - - - .83 1.29 1.66 1.81 2.15 3.01 5.15 7.75
2 3/4 - - - - .91 1.39 1.80 1.97 2.38 3.39 5.73 8.53
3 - - - - .98 1.50 1.94 2.12 2.56 3.64 6.15 9.13
3 1/4 - - - - - 1.62 2.08 2.27 2.74 3.90 6.57 9.70
3 1/2 - - - - - 1.74 2.22 2.42 2.92 4.15 7.00 10.30
3 3/4 - - - - - - 2.36 2.58 3.10 4.40 7.40 10.90
4 - - - - - - 2.50 2.73 3.28 4.66 7.82 11.50
4 1/2 - - - - - - 2.77 3.04 3.66 5.16 8.65 12.70
5 - - - - - - 3.05 3.35 4.02 5.67 9.50 13.90
5 1/2 - - - - - - 3.33 3.66 4.38 6.18 10.33 15.10
6 - - - - - - 3.60 3.96 4.75 6.70 11.17 16.30

 

 

 

 

 

Dimensions of Spanners and Screws

Pan Head Drilled Spanners

Nominal Size
or
Basic Screw
Diameter
A H
Head
Diameter
Head
Height
Max Min Min Max
4 0.1120
0.219 0.205 0.068 0.058
6 0.1380
0.270 0.256 0.082 0.072
8 0.1640
0.322 0.306 0.096 0.085
10 0.1900
0.373 0.357 0.110 0.099
1/4 0.2500
0.492 0.473 0.144 0.130

Flat Head Drilled Spanners



Nominal Size
or
Basic Screw
Diameter
A H
Head
Diameter
Head
Height
Theoretical
Sharp Max
Absolute
Min
Reference
4 0.1120
0.225 0.195 0.067
6 0.1380
0.279 0.244 0.083
8 0.1640
0.332 0.292 0.100
10 0.1900
0.385 0.340 0.116
1/4 0.2500
0.507 0.452 0.153

One-Way Round Head Screws



Nominal Size
or
Basic Screw
Diameter
Head Diameter Head Height
4 0.1120
0.211 0.193 0.086 0.075
6 0.1380
0.260 0.240 0.103 0.091
8 0.1640
0.309 0.287 0.120 0.107
10 0.1900
0.359 0.334 0.137 0.123
12 0.2160
0.408 0.382 0.153 0.139
1/4 0.2500
0.472 0.443 0.175 0.160

One-Way Oval Head Screws



Nominal Size
or
Basic Screw
Diameter
Head Diameter Total Head Height Head Side Height
6 0.1380
0.138 0.244 0.128 0.105 0.083
8 0.1640
0.164 0.292 0.152 0.126 0.100
10 0.1900
0.190 0.340 0.176 0.148 0.116
1/4 0.2500
0.250 0.452 0.232 0.197 0.153

 

 

 

 

 

 

Dimensions of Button Head Sockets
(Dimensions for Hex and Torx Screws)
with exception to the Drive Size

Nominal size
or
Basic Screw
Diameter
A H J P
Head
Diameter
Head
Height
Hex Size Pin
Diameter
Max Min Min Max Max Min
4 0.1120
0.213 0.201 0.059 0.051 3/32 0.035 0.032
6 0.1380
0.262 0.250 0.073 0.063 1/8 0.050 0.048
8 0.1640
0.312 0.298 0.087 0.077 5/32 0.065 0.062
10 0.1900
0.361 0.347 0.101 0.091 5/32 0.065 0.062
1/4 0.2500
0.437 0.419 0.132 0.122 5/32 0.065 0.062
5/16 0.3125
0.547 0.527 0.166 0.152 3/16 0.087 0.085
3/8 0.3750
0.656 0.636 0.199 0.185 7/32 0.095 0.090

 

 

 

 

 

 

 

 
Dimensions of Flat Head Sockets
(Dimensions for Hex and Torx Screws)
with exception to the Drive Size
Nominal size
or
Basic Screw
Diameter
A H J P
Head
Diameter
Head
Height
Hex Size Pin
Diameter
Theoretical Sharp Max Absolute Min Reference Flushness Tolerance Max Min
4 0.1120
0.255 0.218 0.083 0.011 3/32 0.035 0.032
6 0.1380
0.307 0.263 0.097 0.013 1/8 0.050 0.048
8 0.1640
0.359 0.311 0.112 0.014 5/32 0.065 0.062
10 0.1900
0.411 0.359 0.127 0.015 5/32 0.065 0.062
1/4 0.2500
0.531 0.480 0.161 0.016 5/32 0.065 0.062
5/16 0.3125
0.656 0.600 0.198 0.017 3/16 0.087 0.085
3/8 0.3750
0.781 0.720 0.234 0.018 7/32 0.095 0.090

 

 

 

Dimensions of Hex Keys
(Short Arm Series)
Nominal
Key or Bit
and Socket Size
table
W B C Hole Size
Hexagon
Width Across
Flats
Length
of
Short Arm
Length
of
Long Arm
Max Min Max Min Max Min +.005
1/16 0.062
0.0625 0.0615 0.656 0.469 1.844 1.656 0.038
3/32 0.094
0.0937 0.0927 0.750 0.562 2.094 1.906 0.050
1/8 0.125
0.1250 0.1235 0.844 0.656 2.344 2.156 0.075
9/64 0.141
0.1406 0.1391 0.891 0.703 2.469 2.281 0.084
5/32 0.156
0.1562 0.1547 0.938 0.750 2.594 2.406 0.097
3/16 0.188
0.1875 0.1860 1.031 0.844 2.844 2.656 0.102
7/32 0.219
0.2187 0.2172 1.125 0.938 3.094 2.906 0.123
1/4 0.250
0.2500 0.2485 1.219 1.031 3.344 3.156 0.123
5/16 0.312
0.3125 0.3110 1.344 1.156 3.844 3.656 0.201

 

 

hex key