Add this Hard Hat Warning sign at your facility to keep workers safe. OSHA signs are the perfect way to alert your employees and guests when a hazard is present in your facility. Keep your facility safe, buy an OSHA regulated sign today and prevent an accident tomorrow. These OSHA signs comply with OSHA 29 CFR 1910.145. Available in Rigid Plastic or .040 Aluminum. Custom legends available upon request - Call to inquire.