Suppliers of Stainless Steel & Bright Zinc Plated Fasteners.
Spanner Tables
|
|
|
| |
|
Spanners designed for use on BSW or BSF Hex products will be stamped with the thread diameter of the bolt that they fit, but this size stamp will not be the "across-flats" size of the nut or screw head. The following table lists the approximate across-flats measurement of BSW/BSF Hex products of different thread diameters. | |
|
Thread Diameter |
Across Flats Size |
|
1/4" |
0.44" |
|
5/16" |
0.52" |
|
3/8" |
0.60" |
|
7/16" |
0.71" |
|
1/2" |
0.81" |
|
5/8" |
1.00" |
|
3/4" |
1.20" |
|
| ||
|
The following table shows the size of Allen key required for Metric screws of various thread diameters. Please note that Socket Cap Screws require a slightly larger Allen key than Button Head, Countersunk or Flanged Sockets. | ||
|
Thread Outside Diameter |
Allen key for Socket Caps |
Allen key for other head styles |
|
3 mm |
2.5 mm |
2 mm |
|
4 mm |
3 mm |
2.5 mm |
|
5 mm |
4 mm |
3 mm |
|
6 mm |
5 mm |
4 mm |
|
8 mm |
6 mm |
5 mm |
|
10 mm |
8 mm |
6 mm |
|
12 mm |
10 mm |
|
|
| |
|
The following table lists the spanner sizes that fit Metric Hex products of different thread diameters. | |
|
Thread Diameter |
Spanner Size |
|
3 mm |
5.5 mm |
|
4 mm |
7 mm |
|
5 mm |
8 mm |
|
6 mm |
10 mm |
|
8 mm |
13 mm |
|
10 mm |
17 mm |
|
12 mm |
19 mm |
|
14 mm |
22 mm |
|
16 mm |
24 mm |
|
| |
|
The following table lists the most common AF ("Across Flats") spanner sizes that fit UNC and UNF Hex products of different thread diameters. | |
|
Thread Diameter |
Spanner Size |
|
3/16" |
5/16" |
|
1/4" |
7/16" |
|
5/16" |
1/2" |
|
3/8" |
9/16" |
|
7/16" |
11/16" |
|
1/2" |
3/4" |
|
9/16" |
7/8" |
|
5/8" |
1" |
|
3/4" |
1 1/8" |