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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

Specifications

Thread Size	N/A .250-20 (1/4-20)
Type	N/A Self-Locking HNL
Thread Code	N/A 0420
A (Shank) Max.	N/A .058 in
Min. Sheet Thickness	N/A .058 in
Hole Size in Sheet + 0.005 - 0.000	N/A .344 in
C Max.	N/A .343 in
E ± .010	N/A .500 in
T2 ± .010	N/A .189 in
Min. Dist. Hole C/L to Edge	N/A .38 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®)