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Online literature contains the most current information available.
  • Meets torque requirements for IFI 100/107 Grade B (unified) and ANSI B18.16.1M (metric) locknuts.
  • Type H is for use in sheet hardness HRB 80 or less on the Rockwell “B” scale.
  • Type HNL are for use in sheet hardness HRB 60 or less on the Rockwell “B” scale.
Unit of Measure

Thread Size

N/A .313-18 (5/16-18)


N/A Self-Locking HNL

Thread Code

N/A 0518

A (Shank) Max.

N/A .058 in CL_H_HN_dimension.JPG

Min. Sheet Thickness

N/A .058 in

Hole Size in Sheet + 0.005 - 0.000

N/A .413 in

C Max.

N/A .412 in

E ± .010

N/A .575 in

T2 ± .010

N/A .240 in
Min. Dist. Hole C/L to Edge1 N/A .420 in

Thread Specification

N/A IFI 100/107 Grade B

Fastener Material

N/A Carbon Steel

Material Finish

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

For Use in Sheet Hardness

N/A HRB 60 / HB 107 or Less

CAD Supplier

N/A PennEngineering® (PEM®)
  • 1 To minimize sheet distortion and maximize product performance, use a centerline-to-edge value greater or equal to the value specified.