Experts in the development and manufacture of precision fasteners,
components and systems, specializing in thin sheet attachment solutions.

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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.
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Part #

Thread Size

A (Shank) Max.

Hole Size in Sheet + .003 - .000

E ± .010

Fastener Material

Standard Finish

Optional Finish

CAD

S-RT440-0ZI N/A .112-40 (#4-40) N/A .030 in N/A .166 in N/A .250 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
S-RT632-0ZI N/A .138-32 (#6-32) N/A .030 in N/A .1875 in N/A .280 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
S-RT832-0ZI N/A .164-32 (#8-32) N/A .030 in N/A .213 in N/A .310 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
SS-RT032-0ZI N/A .190-32 (#10-32) N/A .030 in N/A .250 in N/A .340 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
S-RT0420-0ZI N/A .250-20 (1/4-20) N/A .045 in N/A .344 in N/A .440 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
S-RT440-1ZI N/A .112-40 (#4-40) N/A .038 in N/A .166 in N/A .250 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
S-RT632-1ZI N/A .138-32 (#6-32) N/A .038 in N/A .1875 in N/A .280 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
S-RT832-1ZI N/A .164-32 (#8-32) N/A .038 in N/A .213 in N/A .310 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
SS-RT032-1ZI N/A .190-32 (#10-32) N/A .038 in N/A .250 in N/A .340 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
S-RT0420-1ZI N/A .250-20 (1/4-20) N/A .054 in N/A .344 in N/A .440 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
S-RT0518-1ZI N/A .313-18 (5/16-18) N/A .054 in N/A .413 in N/A .500 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
S-RT440-2ZI N/A .112-40 (#4-40) N/A .054 in N/A .166 in N/A .250 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
S-RT632-2ZI N/A .138-32 (#6-32) N/A .054 in N/A .1875 in N/A .280 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
S-RT832-2ZI N/A .164-32 (#8-32) N/A .054 in N/A .213 in N/A .310 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
SS-RT032-2ZI N/A .190-32 (#10-32) N/A .054 in N/A .250 in N/A .340 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
S-RT0420-2ZI N/A .250-20 (1/4-20) N/A .087 in N/A .344 in N/A .440 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
S-RT0518-2ZI N/A .313-18 (5/16-18) N/A .087 in N/A .413 in N/A .500 in N/A Hardened Carbon Steel N/A Zinc Plated, 5µm, Colorless N/A N/A
S-RT440-0ZC N/A .112-40 (#4-40) N/A .030 in N/A .166 in N/A .250 in N/A Hardened Carbon Steel N/A N/A Zinc Plated 5µm, Yellow N/A
S-RT632-0ZC N/A .138-32 (#6-32) N/A .030 in N/A .1875 in N/A .280 in N/A Hardened Carbon Steel N/A N/A Zinc Plated 5µm, Yellow N/A
S-RT832-0ZC N/A .164-32 (#8-32) N/A .030 in N/A .213 in N/A .310 in N/A Hardened Carbon Steel N/A N/A Zinc Plated 5µm, Yellow N/A
SS-RT032-0ZC N/A .190-32 (#10-32) N/A .030 in N/A .250 in N/A .340 in N/A Hardened Carbon Steel N/A N/A Zinc Plated 5µm, Yellow N/A
S-RT0420-0ZC N/A .250-20 (1/4-20) N/A .045 in N/A .344 in N/A .440 in N/A Hardened Carbon Steel N/A N/A Zinc Plated 5µm, Yellow N/A
S-RT440-1ZC N/A .112-40 (#4-40) N/A .038 in N/A .166 in N/A .250 in N/A Hardened Carbon Steel N/A N/A Zinc Plated 5µm, Yellow N/A
S-RT632-1ZC N/A .138-32 (#6-32) N/A .038 in N/A .1875 in N/A .280 in N/A Hardened Carbon Steel N/A N/A Zinc Plated 5µm, Yellow N/A
S-RT832-1ZC N/A .164-32 (#8-32) N/A .038 in N/A .213 in N/A .310 in N/A Hardened Carbon Steel N/A N/A Zinc Plated 5µm, Yellow N/A
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