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PEM® brand miniature fasteners fit into a minimal space and provide strong, reusable threads.

Types FE, FEO and UL are self-locking. Types FE and FEO thread locking torque performance is equivalent to applicable NASM25027 specifications. Ty
Unit of Measure

Thread Size

 N/A .250-28 (1/4-28)

Thread Type

 N/A Non-Locking

Thread Code

 N/A 0428

A (Shank) Max.

 N/A .060 in a1387_1.jpg
Sheet Thickness1 N/A .059 to .070 in

Hole Size in Sheet + .003 - .000

 N/A .344 in

C + .000 - .005

 N/A .343 in

D Max.

 N/A .318 in

E ± .005

 N/A .384 in

T + .015 -.000

 N/A .120 in
Min. Dist. Hole C/L to Edge2 N/A .28 in

Max. Hole in Attached Parts

 N/A .270 in
For Use in Sheet Hardness3 N/A HRB 70 / HB 125 or Less

Thread Specification

 N/A Internal, ANSI B1.1, 2B

Fastener Material

 N/A 300 Series Stainless Steel

Standard Finish

 N/A Passivated and/or tested per ASTM A380

CAD Supplier

 N/A PennEngineering® (PEM®)
  • 1 In applications between the sheet thicknesses for your thread size, see last paragraph of installation data on page FE-6. Knurled collar may fracture if fastener is used in sheets thicker than the specified range and the screw is tightened beyond maximum
  • 2 To minimize sheet distortion and maximize product performance, use a centerline-to-edge value greater or equal to the value specified.
  • 3 HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.