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All Categories > SI® Brand Insert for Plastics > Molded-in Inserts > Knurled Spacers – Types STKA, STKB, STKC > Molded-in Threaded Inserts, Thru-Threaded, Knurled - Unified > Part # STKA-0420-4

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Uniform knurl diameter reduces the risk of sink marks.
Available in varying lengths for injection molding assemblies.
Aluminum inserts ideal for light weight designs.
Aluminum and stainless steel inserts offer lead-free alternative.

Unit of Measure

Specifications

Thread Size	N/A .250-20 (1/4-20)
Type	N/A STKA
Thread Code¹	N/A 0420
Length Code	N/A 4
L - Length ± .005²	N/A .125 in Loading zoom
E Nom.	N/A .375 in
Minor Dia.Min.	N/A .197 in
Minor Dia.Max.	N/A .207 in
Thread Specification	N/A 2B per ASME B1.1
Standard Material	N/A Aluminum
Standard Finish	N/A Plain
CAD Supplier	N/A PennEngineering® (SI®)
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¹ Thread tapped thru, Class 3A/4h screw must pass with finger torque, but basic go gauge may stop at last thread.
² The “L” dimension is the height of the installed stud at max grip. The height of the stud will increase if it is installed into thinner material. To calculate “actual L” use this formula: max grip - actual grip + L = “actual L”