Counter Bore or Counter Sink Methods
When an arc stud is welded, a fillet forms around its base with the fillet dimensions being closely controlled by the design of the ferrule used. Since the diameter of the fillet is generally larger than the diameter of the stud, some consideration is required in the design of mating parts. Counter bore and counter sink methods are commonly used. Dimensions will vary with studs and ferrules. Additional methods of accommodating fillet include over sized clearance holes, use of a gasket material around the fillet or use of a dog type construction.
If an oversized fillet does not meet the application
Welded studs designed with a reduced weld base are available so that the weld fillet does not exceed the maximum diameter fastener. This design is not recommended if full fastener strength is important.
| D | Min L | Td | Tl | Bd | Bl | Ferrule Id |
|---|---|---|---|---|---|---|
| 3/8 | 1-1/2 | 1/4-20 | 3/8 | .250 | 7/16 | FS250 |
| 1/2 | 1-1/2 | 3/8-16 | 9/16 | .375 | 7/16 | FS375 |
| 5/8 | 1-1/2 | 7/16-14 | 21/32 | .500 | 1/2 | FS500 |
| 3/4 | 1-1/2 | 1/2-13 | 3/4 | .500 | 1/2 | FS500 |
| 7/8 | 2 | 5/8-11 | 15/16 | .625 | 5/8 | FS625 |
| 1″ | 2-1/2 | 3/4-10 | 1″ | .750 | 5/8 | FS750 |
| Low Carbon Steel | |
|---|---|
| C | 0.23% max. |
| Mn | 0.90% max. |
| P | 0.04% max. |
| S | 0.05% max. |
| Tensile | 60,000 psi (min.) |
| Yield | 50,000 psi (min.) |
| Elong | 20% (in 2 inches) |
| Plating | Copper coating is standard on pins. Copper and other platings available upon customer request |
| Stainless Steel | |
|---|---|
| Mat Note | AISI grade – 302/304/305 std. Other grades available upon request. |
| Plating | Does not apply to Stainless |
| Mech Note | Values for various grades available upon request. |