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PEM® S-RT™ free-running locknuts are free-running until clamp load is induced. A modified thread angle on the loaded flank provides the vibration resistant locking feature.
  • Screw turns freely until a clamp load is applied.
  • Resistant to vibrational loosening.
  • Back side of panel is flush or sub-flush for screw installation.
  • Locking feature reusability is not affected by number of on/off cycles.
  • Uses same mounting hole and installation tooling as standard S™ nut fasteners found in PEM® Bulletin CL.
Unit of Measure

Thread Size

N/A .164-32 (#8-32)

Thread Code

N/A RT832
Shank Code1 N/A 1

A (Shank) Max.

N/A .038 in RT-Drawing.jpg
Rec. Min. Sheet Thickness2 N/A .040 in

Hole Size in Sheet + .003 - .000

N/A .213 in

C Max.

N/A .212 in

E ± .010

N/A .310 in

T ± .010

N/A .090 in
Min. Dist. Hole C/L to Edge3 N/A .27 in

For Use in Sheet Hardness

N/A HRB 80 / HB 150 or less

Thread Specification

N/A Modified thread form on loaded flank. Will accept a maximum material 6g screw.

Fastener Material

N/A Hardened Carbon Steel

Standard Finish

N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless

CAD Supplier

N/A PennEngineering® (PEM®)


N/A {0}
  • 1 Other shank and screw lengths available.
  • 2 For maximum performance, we recommend that you use the maximum shank length for your sheet thickness.
  • 3 To minimize sheet distortion and maximize product performance, use a centerline-to-edge value greater or equal to the value specified.