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PEM® 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.
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All Metal, S-RT Free-Running Locknuts

All Metal, RT® Free-Running Locknuts - Unified
All Metal, S-RT Free-Running Locknuts

All Metal, RT® Free-Running Locknuts - Unified
All Metal, S-RT Free-Running Locknuts

All Metal, RT® Free-Running Locknuts - Unified
All Metal, S-RT Free-Running Locknuts

All Metal, RT® Free-Running Locknuts - Unified
All Metal, S-RT Free-Running Locknuts

All Metal, RT® Free-Running Locknuts - Unified
Description N/A 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.
Thread Size N/A .112-40 (#4-40) N/A .138-32 (#6-32) N/A .164-32 (#8-32) N/A .190-32 (#10-32) N/A .250-20 (1/4-20)
Thread Code N/A RT440 N/A RT632 N/A RT832 N/A RT032 N/A RT0420
Shank Code N/A 0
A (Shank) Max.
N/A .030 in RT-Drawing.jpg N/A .030 in RT-Drawing.jpg N/A .030 in RT-Drawing.jpg N/A .030 in RT-Drawing.jpg N/A .045 in RT-Drawing.jpg
Rec. Min. Sheet Thickness1 N/A .030 in N/A .030 in N/A .030 in N/A .030 in N/A .047 in
Hole Size in Sheet + .003 - .000 N/A .166 in N/A .1875 in N/A .213 in N/A .250 in N/A .344 in
C Max. N/A .165 in N/A .187 in N/A .212 in N/A .249 in N/A .343 in
E ± .010 N/A .250 in N/A .280 in N/A .310 in N/A .340 in N/A .440 in
T ± .010 N/A .070 in N/A .070 in N/A .090 in N/A .090 in N/A .170 in
Min. Dist. Hole C/L to Edge N/A .19 in N/A .22 in N/A .27 in N/A .28 in N/A .34 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
Optional Finish N/A
CAD Supplier N/A PennEngineering® (PEM®)
  • 1 For maximum performance, we recommend that you use the maximum shank length for your sheet thickness.