Bolts, Screws and Studs
| Type | Code | |
|---|---|---|
| Hexagon | X) | Single-letter |
| Round | R) | Single-letter |
| Mushroom | M) | Single-letter |
| Cheese | C) | Single-letter |
| Plain | P) | Single-letter |
| Flat Countersunk | K) | Single-letter |
| Raised Head Countersunk | D) | Single-letter |
| Stud | S) | Single-letter |
| Nuts | ||
| Self-Locking | L) | Single-letter |
| Plain | A) | Single-letter |
| Nyloc | Y) | Single-letter |
| Washers | ||
| Shakeproof | L) | Single-letter |
| Plain | A) | Single-letter |
Bolts, Screws and Nuts
| Type | Code | |
|---|---|---|
| U.N .F. | UF) | Two letters or digits |
| U.N.C. | UC) | Two letters or digits |
| Metric | MM) | Two letters or digits |
| Screws | ||
| Wood | WD) | Two letters or digits |
| Self-Tapping | ST) | Two letters or digits |
| Washers | ||
| Internal diameter in | ) | Two digits |
| 16ths. inch or millimeters | ) | Two digits |
Bolt
| Type | Code | |
|---|---|---|
| Bolt | B) | Single letter |
| Screw | S) | Single letter |
| Nut | N) | Single letter |
| Washer | W) | Single letter |
| Stud | T) | Single letter |
Bolts, Screws, Nuts and Studs
| Type | Code | |
|---|---|---|
| Diameter in 16ths. inch or millimetres | ) | Two digits |
| Plain Washers | ||
| Outside diameter in 16ths. inch or millimetres | ) | Two digits |
| Shakeproof Washers | ||
| All sizes | 00) | Two digits |
| Self-Tapping Screw and Wood Screw | ||
| Number | ) | Two digits |
Bolts and Screws
| Type | Code | |
|---|---|---|
| Length in 16ths. inch or millimetres | ) | Two digits |
| Nuts | ||
| Full | F) | Two letters |
| Half | H) | Two letters |
| Plain Washers | ||
| Thickness by .01 inch | ) | Two digits |
| Shakeproof Washers | ||
| All sizes | 00) | Two digits |
Studs
| SUCC | UNC both ends | ) | Four digits |
| SUFF | UNF both ends | ) | Four digits |
| SUFC | UNF one end, UNC other end | ) | Four digits |
| SMMM | Metric | ) | Four digits |
ALL CODES:
All codes (Part Numbers) have eight letters/ figures. Shank lengths, material specification and finish are all standard.