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 visual indication when proper installation has been accomplished.

A strong, knurled collar, which is completely embedded in the sheet, guarantees against rotation of the fastener in the sheet. The torque-out resistance of the knurl greatly exceeds the torque that can be exerted by the selflocking feature.

When this collar is embedded in the sheet, the undercut cavity beneath the collar is filled with displaced sheet material thereby developing pushout resistance.

A dry-film lubricant applied to thesemore
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Unit of Measure

Thread Size x Pitch

 M3 x 0.5

Thread Type

 Self-Locking

Thread Code

 M3

A (Shank) Max.

 1.020 mm
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Sheet Thickness1 0.99 to 1.14 mm

Hole Size in Sheet + 0.08

 4.39 mm

C - 0.13

 4.37 mm

D Max.

 3.96 mm

E ± 0.13

 4.88 mm

T + 0.4

 1.90 mm

Min. Dist. Hole C/L to Edge

 3.6 mm

Max. Hole in Attached Parts

 3.5 mm
For Use in Sheet Hardness2 HRB 70 / HB 125 or Less

Thread Specification

 Internal, ANSI B1.21M, MJ 4H6H 4H5H (M6 thread)

Fastener Material

 300 Series Stainless Steel

Standard Finish

 Black, Dry-film Lubricant

CAD Supplier

 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 HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.