There are 2 ranges of British stiffnuts, those with BA/BSF thread (AGS2001 - AGS2019) and those with UNC/UNF thread (A125 - A137).
“AGS” series BA/BSF stiffnuts are ordered by the main part number, followed by the size code, a number denoting the material and finally a suffix to denote the type. For example: AGS2001-C1-66 would be 2 BA, plated steel, all metal.
AGS floating anchor nuts require 2 numbers for the material. The first one relates to the outer casing/base and the second to the inner nut itself. For example: AGS2013-C32-66 has an aluminium base and corrosion resistant steel nut.
“A” series UNC/UNF stiffnuts only require a the size code and type suffix as the main part number denotes the material. For example: A127-C77 is an 8/32” UNC nyloc nut.
| Suffix | Type |
|---|
| -66 | All Metal |
| -77 | Nyloc |
| AGS Materials |
|---|
| Code | Material |
|---|
| -1 | Cadmium Plated Steel |
| -2 | Corrosion Resistant Steel |
| -3 | Aluminium |
| -4 | Brass |
| BA/BSF Sizes |
|---|
| Size | Thread |
|---|
| A | 6 BA |
| B | 4 BA |
| C | 2 BA |
| E | 1/4” BSF |
| G | 5/16” BSF |
| J | 3/8” BSF |
| L | 7/16” BSF |
| N | 1/2” BSF |
| UNC/UNF Sizes |
|---|
| Size | Thread |
|---|
| A | 4-40 UNC |
| B | 6-32 UNC |
| C | 8-32 UNC |
| D | 10-32 UNF |
| E | 1/4” UNF |
| G | 5/16” UNF |
| J | 3/8” UNF |
| L | 7/16” UNF |
| N | 1/2” UNF |
