Holding Industry Together

Units 8 & 9 Metro Centre, Toutley Road,

Wokingham, Berkshire, RG41 1QW

Orders & Enquiries, simply call:   +44(0)1344 777189  

Email : sales@targetfastenings.com

Unit conversion and data
THREAD
 SIZE
PITCH
 UNC
PITCH
 UNF
Hex  Flat
Hex
 Corners
Head
 Height
Bolt T.L
No.4
40
48
0.187
0.216
0.06
0.474
No.5
40
44
0.188
0.217
0.07
0.5
No.6
32
40
0.25
0.289
0.093
0.526
No.8
32
36
0.25
0.289
0.11
0.578
No.10
24
32
0.312
0.36
0.12
0.63
1/4
20
28
0.437
0.505
0.163
0.75
5/16
18
24
0.5
0.577
0.211
0.875
3/8
16
24
0.562
0.65
0.243
1
7/16
14
20
0.625
0.722
0.291
1.125
1/2
13
20
0.75
0.866
0.323
1.25
9/16
11
18
0.812
0.938
0.371
1.375
5/8
11
18
0.937
1.083
0.403
1.5
3/4
10
16
1.125
1.3
0.483
1.75
7/8
9
14
1.312
1.515
0.563
2
1
8
12
1.5
1.732
0.627
2.25
1 1/8
7
12
1.687
1.948
0.718
2.5
1 1/4
7
12
1.875
2.165
0.813
2.75
1 3/8
6
12
2.062
2.382
0.878
3
1 1/2
6
12
2.25
2.598
0.974
3.25
1 3/4
5
12
2.625
3.031
1.134
3.75
2
4.5
12
3
3.464
1.263
4.25
2 1/2
4
12
3.75
4.33
1.583
5.25
3
4
12
4.5
5.196
1.935
6.25
3 1/2
4
12
5.25
6.062
2.193
6.75
4
4
12
6
6.928
2.576
8.25

                            actual         nom             max                max              max             min


Hex Head Bolts and Setscrews UNC/UNF BS1768
Lengths 5’’ to 8’’ add 1/4’’ to T.L,  and exceeding 8’’ add 3/4’’ to T.L
These dimensions are
 For guidance only