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® 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.
All Metal, S-RT Free-Running Locknuts
All Metal, S-RT Free-Running Locknuts 2
Unit of Measure
1 2 

Part #

Thread Size x Pitch

A (Shank) Max.

Hole Size in Sheet + 0.08

E ± 0.25

Fastener Material

Standard Finish

Optional Finish

CAD

S-RTM6-2ZC N/A M6 x 1 N/A 2.21 mm N/A 8.75 mm N/A 11.18 mm N/A Hardened Carbon Steel N/A N/A Zinc plated per ASTM B633, SC1 (5µm), Type II, yellow N/A CAD Icon (for items table)
S-RTM8-1ZI N/A M8 x 1.25 N/A 1.38 mm N/A 10.49 mm N/A 12.70 mm N/A Hardened Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A N/A CAD Icon (for items table)
S-RTM8-1ZC N/A M8 x 1.25 N/A 1.38 mm N/A 10.49 mm N/A 12.70 mm N/A Hardened Carbon Steel N/A N/A Zinc plated per ASTM B633, SC1 (5µm), Type II, yellow N/A CAD Icon (for items table)
S-RTM8-2ZI N/A M8 x 1.25 N/A 2.21 mm N/A 10.49 mm N/A 12.70 mm N/A Hardened Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A N/A CAD Icon (for items table)
S-RTM8-2ZC N/A M8 x 1.25 N/A 2.21 mm N/A 10.49 mm N/A 12.70 mm N/A Hardened Carbon Steel N/A N/A Zinc plated per ASTM B633, SC1 (5µm), Type II, yellow N/A CAD Icon (for items table)
Unit of Measure
1 2