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  • Designed for use in tapered holes.
  • Tapered mounting hole allows for rapid and accurate alignment prior to installation.
  • Aluminum inserts ideal for light weight designs.
  • Aluminum and stainless steel inserts offer lead-free alternative.
Unit of Measure

Thread Size

.250-28 (1/4-28)

Type

IUA
Thread Code1 0428

Length Code

2

A ± .005

.500 in
SI_IUB_dimension-518.jpg

E ± .005

.375 in

C ± .005

.332 in

Min. Hole Depth

.540 in

D ± .002

.321 in

F ± .002

.363 in

R Ref. Taper Length

.300 in

Fastener Material

Aluminum

Standard Finish

Plain

CAD Supplier

PennEngineering® (SI®)
  • 1 Thread tapped thru, Class 3A/4h screw must pass with finger torque, but basic go gauge may stop at last thread.