FRB Welding Studs

FRB (Full Reduced Base) welding studs are threaded fasteners with a weld base diameter 1/8" less than the major thread size (i.e. 3/8-16 has 1/4" dia. weld base). The weld fillet will always be the same nominal diameter as the thread. Holes in mating parts can be normal clearance size for a given thread. Caution: FRB studs will not develop full thread strength. For sizes smaller than 5/16" or larger than 1/2", use RB studs.
Typical Use: In application where the mating part must fit closely over the stud with full nut run down.
Length Specifications: Standard lengths form 3/4" to 4" (BW).
Specifications: Material, ARc Shields and ordering data same as RB studs above.

Thread Size

T
Weld Base Diameter (Nom.)

D
Minimum Unthreaded Length

BW
Minimum Length Approximate Weld Bead Dimensions Arc Shield Number
Before Weld

L(BW)
After Weld (Nom.)

L(AW)
Dia.

E
Hgt.

F
5/16-18
3/8-18
7/16-14
1/2-13
3/16
1/4
5/16
3/8
1/4
1/4
9/32
9/32
3/4
3/4
3/4
3/4
5/8
5/8
5/8
5/8
5/16
3/8
7/16
1/2
1/8
1/8
5/32
5/32
009-674
009-675
009-676
009-677


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