N.H. Code Admin. R. Saf-C 5013.01
Padlocks used on outdoor storage magazines shall be constructed of not less than 7/16 inch diameter shackle, case hardened or stainless steel alloy, 420°F or 216°C, heat treated to rockwell hardness of C53. Shackle clearance shall not be less than one inch.
Source. (See Revision Note at Chapter Heading for Saf-C 5000) #6055, eff 7-1-95, EXPIRED: 7-1-03 New. #8117, INTERIM, eff 7-14-04, EXPIRED: 1-10-05 New. #8261, eff 1-21-05; ss by #9765-A, eff 8-2-10; ss by #12738, eff 4-30-19