Part # FE-0428MD, Miniature Self-Clinching Fasteners - Types U, UL, FE, FEO, FEOX, FEX

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. Type UL self-locking nuts meet locking torque requirements specified herein. Some sizes of FE, FEO, and UL can be ordered to NASM45938/7 specifications. Types FEX, FEOX and U have free-running class 2B/6H threads.

PEM miniature fasteners provide immediate visualmore

Unit of Measure

Specifications

Thread Size	N/A .250-28 (1/4-28)
Thread Type	N/A Self-Locking
Thread Code	N/A 0428
A (Shank) Max.	N/A .060 in
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, MIL-S-8879, UNJ-3B
Fastener Material	N/A 300 Series Stainless Steel
Standard Finish	N/A Black, Dry-film Lubricant
CAD Supplier	N/A PennEngineering® (PEM®)
Inventory	N/A

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.

Specifications

Thread Size

Thread Type

Thread Code

A (Shank) Max.

Hole Size in Sheet + .003 - .000

C + .000 - .005

D Max.

E ± .005

T + .015 -.000

Max. Hole in Attached Parts

Thread Specification

Fastener Material

Standard Finish

CAD Supplier

Inventory