Tapped Reduced Base

tapped reduced base arc weld stud

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.


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