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PennEngineering
All Categories > PEM® Brand Fasteners for Metal Sheets and Panels > Nuts for Sheet Metal > All Metal, Locking Thread Nuts – Types FE, FEO, HNL, LA4, LAC, LAS, LK, LKA, LKS, SL, UL, RT > All Metal, RT® Free-Running Locknuts > All Metal, RT® Free-Running Locknuts - Unified > Part # S-RT0420-2ZC  

Part # S-RT0420-2ZC, All Metal, RT® Free-Running Locknuts - Unified

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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.




 Specifications   

Thread Size
.250-20 (1/4-20)

Thread Code
RT0420

Shank Code
2

A (Shank) Max.

 View
.087 in

Rec. Min. Sheet Thickness1
.090 in

Hole Size in Sheet + .003 - .000
.344 in

C Max.
.343 in

E ± .010
.440 in

T ± .010
.170 in

Min. Dist. Hole C/L to Edge
.34 in

For Use in Sheet Hardness
HRB 80 / HB 150 or less

Thread Specification
Modified thread form on loaded flank. Will accept a maximum material 6g screw.

Fastener Material
Hardened Carbon Steel

Optional Finish
Zinc plated per ASTM B633, SC1 (5µm), Type II, yellow

CAD Supplier
PennEngineering® (PEM®)
1 For maximum performance, we recommend that you use the maximum shank length for your sheet thickness.



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