DW Weld Screw:
Used when a weld screw is needed and confined location requires a narrow head.

GW, GWZ, GWM Weld Screws:
Used where a design requires a smooth, non marred surface and a fastener permanently fixed in place.

HW, HWZ, HWM Weld Screws:
Used where a self-locating screw is required. Provides a flush surface for attaching mating parts. 

Graded Weld Screws:
Graded weld screw property class 8.8 and class 10.9 with sausage style projections.

PD,PDZ Weld Screws:
Can be welded to the sides of components with the advantages of offset threads. 

RW, RWZ, RWM Weld Screws:
Used where a hermetic seal is required to prevent leakage of air, gas, water or oil.