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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. 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 these fasteners provides the smooth, non-galling prevailing torque performance necessary for reliable locking and for reusability.
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Miniature nuts – FE, FEO, FEOX, FEX, U, UL

Miniature Self-Clinching Fasteners - Types U, UL, FE, FEO, FEOX, FEX - Unified
Miniature nuts – FE, FEO, FEOX, FEX, U, UL

Miniature Self-Clinching Fasteners - Types U, UL, FE, FEO, FEOX, FEX - Unified
Miniature nuts – FE, FEO, FEOX, FEX, U, UL

Miniature Self-Clinching Fasteners - Types U, UL, FE, FEO, FEOX, FEX - Unified
Miniature nuts – FE, FEO, FEOX, FEX, U, UL

Miniature Self-Clinching Fasteners - Types U, UL, FE, FEO, FEOX, FEX - Unified
Miniature nuts – FE, FEO, FEOX, FEX, U, UL

Miniature Self-Clinching Fasteners - Types U, UL, FE, FEO, FEOX, FEX - Unified
Description N/A 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
Thread Size N/A .060-80 (#0-80) N/A .073-64 (#1-64) N/A .086-56 (#2-56) N/A .086-56 (#2-56) N/A .060-80 (#0-80)
Thread Type N/A Non-Locking N/A Non-Locking N/A Non-Locking N/A Non-Locking N/A Self-Locking
Thread Code N/A 080 N/A 164 N/A 256 N/A 256 N/A 080
Shank Code1 N/A 0 N/A 0 N/A 0 N/A 1 N/A 0
A (Shank) Max.
N/A .020 in a1387.jpg N/A .020 in a1387.jpg N/A .020 in a1387.jpg N/A .031 in a1387.jpg N/A .020 in a1387.jpg
Sheet Thickness2 N/A .019 to .022 in N/A .019 to .022 in N/A .019 to .022 in N/A .030 to .036 in N/A .019 to .022 in
Hole Size in Sheet + .003 - .000 N/A .110 in N/A .110 in N/A .144 in N/A .144 in N/A .110 in
C + .000 - .005 N/A .110 in N/A .110 in N/A .144 in N/A .144 in N/A .110 in
D Max. N/A .076 in N/A .090 in N/A .106 in N/A .106 in N/A .076 in
E ± .005 N/A .125 in N/A .125 in N/A .160 in N/A .160 in N/A .125 in
T + .015 -.000 N/A .050 in N/A .050 in N/A .065 in N/A .065 in N/A .050 in
Min. Dist. Hole C/L to Edge N/A .090 in N/A .090 in N/A .110 in N/A .110 in N/A .090 in
Max. Hole in Attached Parts N/A .080 in N/A .093 in N/A .106 in N/A .106 in N/A .080 in
For Use in Sheet Hardness3 N/A HRB 70 / HB 125 or Less
Thread Specification N/A Internal, ANSI B1.1, 2B N/A Internal, ANSI B1.1, 2B N/A Internal, ANSI B1.1, 2B N/A Internal, ANSI B1.1, 2B N/A Internal, MIL-S-8879, UNJ-3B
Fastener Material N/A 300 Series Stainless Steel
Standard Finish N/A Passivated and/or tested per ASTM A380 N/A Passivated and/or tested per ASTM A380 N/A Passivated and/or tested per ASTM A380 N/A Passivated and/or tested per ASTM A380 N/A Passivated Plus Clear Dry-film Lubricant
CAD Supplier N/A PennEngineering® (PEM®)
  • 1 Shank code applicable only to Types U and UL fasteners.
  • 2 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 tightening torque.
  • 3 HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.