#	Letters of Interpretation
1	08/17/2026 - 1910.135(b) - OSHA's Head Protection Requirements and Selection and Use of Type II Safety Helmets
2	08/17/2026 - 1910.135(a) - OSHA's Head Protection Requirements and Selection and Use of Type II Safety Helmets
3	08/17/2026 - 1910.135, 1910.135(a), 1910.135(b) - OSHA's Head Protection Requirements and Selection and Use of Type II Safety Helmets
4	06/06/2024 - 1910.135(b)(1) - Cranes and the use of protective helmets
5	06/06/2024 - 1910.135(a)(1) - Cranes and the use of protective helmets
6	06/06/2024 - 1910.135, 1910.135(a)(1), 1910.135(b)(1) - Cranes and the use of protective helmets
7	10/02/2015 - 1910.135 - Heat energy estimates for arc-rated protective clothing and faceshields for open-air work on multi-phase overhead power lines.
8	08/01/2014 - 1910.135 - The use of hard hats while working on roofs in hot weather
9	10/27/2009 - 1910.135 - Painting or placement of adhesive stickers on protective helmet shell.
10	06/25/2002 - 1910.135(b) - Acceptability of aluminum hard hats.
11	07/03/1995 - 1910.135 - Interpretation of the Personal Protective Equipment standard
12	01/26/1994 - 1910.135 - Exemption from wearing hard hats.
13	07/13/1993 - 1910.135 - Head protection standard.
14	06/30/1992 - 1910.135 - OSHA rules pertaining to the wearing of hard hats by employees who are members of certain religious groups.
15	08/23/1983 - 1910.135 - Clarification on standards for head protection.
16	01/21/1980 - 1910.135 - Bump caps would not provide adequate employee head protection for all exposures in manholes.
17	11/30/1977 - 1910.135 - Elliott Company's plant-wide hard hat program.
18	08/22/1977 - 1910.135 - The wearing of hard hats.
19	06/14/1977 - 1910.135 - Testing of the WindGard.