PennEngineering
PennEngineering
Corporate Headquarters – Danboro, PA
5190 Old Easton Rd.
Danboro, PA 18916
Phone: 215-766-8853
Toll-Free Phone: 1-800-237-4736 (U.S. only)
Email: info@pemnet.com
Website: www.pemnet.com
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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.
Miniature nuts – FE, FEO, FEOX, FEX, U, UL
Miniature Self-Clinching Fasteners - Types U, UL, FE, FEO, FEOX, FEX 2
Unit of Measure
1 2 

Part #

Thread Size

Thread Type

Sheet Thickness

Hole Size in Sheet + .003 - .000

Standard Finish

CAD

U-080-0 N/A .060-80 (#0-80) N/A Non-Locking N/A .019 to .022 in N/A .110 in N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
U-164-0 N/A .073-64 (#1-64) N/A Non-Locking N/A .019 to .022 in N/A .110 in N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
U-256-0 N/A .086-56 (#2-56) N/A Non-Locking N/A .019 to .022 in N/A .144 in N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
U-256-1 N/A .086-56 (#2-56) N/A Non-Locking N/A .030 to .036 in N/A .144 in N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
UL-080-0CW N/A .060-80 (#0-80) N/A Self-Locking N/A .019 to .022 in N/A .110 in N/A Passivated Plus Clear Dry-film Lubricant N/A CAD Icon (for items table)
UL-164-0CW N/A .073-64 (#1-64) N/A Self-Locking N/A .019 to .022 in N/A .110 in N/A Passivated Plus Clear Dry-film Lubricant N/A CAD Icon (for items table)
UL-256-0CW N/A .086-56 (#2-56) N/A Self-Locking N/A .019 to .022 in N/A .144 in N/A Passivated Plus Clear Dry-film Lubricant N/A CAD Icon (for items table)
UL-256-1CW N/A .086-56 (#2-56) N/A Self-Locking N/A .030 to .036 in N/A .144 in N/A Passivated Plus Clear Dry-film Lubricant N/A CAD Icon (for items table)
FE-440MD N/A .112-40 (#4-40) N/A Self-Locking N/A .059 to .070 in N/A .172 in N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
FE-632MD N/A .138-32 (#6-32) N/A Self-Locking N/A .059 to .070 in N/A .213 in N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
FE-832MD N/A .164-32 (#8-32) N/A Self-Locking N/A .059 to .070 in N/A .290 in N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
FE-032MD N/A .190-32 (#10-32) N/A Self-Locking N/A .059 to .070 in N/A .290 in N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
FE-0420MD N/A .250-20 (1/4-20) N/A Self-Locking N/A .059 to .070 in N/A .344 in N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
FE-0428MD N/A .250-28 (1/4-28) N/A Self-Locking N/A .059 to .070 in N/A .344 in N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
FEX-440 N/A .112-40 (#4-40) N/A Non-Locking N/A .059 to .070 in N/A .172 in N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
FEX-632 N/A .138-32 (#6-32) N/A Non-Locking N/A .059 to .070 in N/A .213 in N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
FEX-832 N/A .164-32 (#8-32) N/A Non-Locking N/A .059 to .070 in N/A .290 in N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
FEX-032 N/A .190-32 (#10-32) N/A Non-Locking N/A .059 to .070 in N/A .290 in N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
FEX-0420 N/A .250-20 (1/4-20) N/A Non-Locking N/A .059 to .070 in N/A .344 in N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
FEX-0428 N/A .250-28 (1/4-28) N/A Non-Locking N/A .059 to .070 in N/A .344 in N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
FEO-440-MD N/A .112-40 (#4-40) N/A Self-Locking N/A .039 to .045 in N/A .172 in N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
FEO-632-MD N/A .138-32 (#6-32) N/A Self-Locking N/A .039 to .045 in N/A .213 in N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
FEO-832-MD N/A .164-32 (#8-32) N/A Self-Locking N/A .039 to .045 in N/A .290 in N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
FEO-032-MD N/A .190-32 (#10-32) N/A Self-Locking N/A .039 to .045 in N/A .290 in N/A Black, Dry-film Lubricant N/A CAD Icon (for items table)
FEOX-440 N/A .112-40 (#4-40) N/A Non-Locking N/A .039 to .045 in N/A .172 in N/A Passivated and/or tested per ASTM A380 N/A CAD Icon (for items table)
Unit of Measure
1 2