Following are several relevant associations, standards stores, and helpful engineering and industrial search engines.

AMT: The Association for Manufacturing Technology
ANSI: American National Standards Institute    ANSI Online Electronic Standards Store (ESS)
ANSI B11 Standards: B11 Standards, Inc.
ASME: American Society of Mechanical Engineers
ASSP: American Society of Safety Professionals
CSA: Canadian Standards Association
FMA: Fabricators & Manufacturers Association, International
GPO: U.S. Government Publishing Office
IEC: International Electrotechnical Commission
IEEE GlobalSpec: IEEE GlobalSpec Engineering360 Search & Industrial Supplier Catalogs
IES: The Illuminating Engineering Society
IHS Markit Standards Store: IHS Markit Standards Store | Engineering & Technical Information
IoPP: Institute of Packaging Professionals
ISO: International Organization for Standardization
MHI: Material Handling Institute
NEMA: National Electrical Manufacturers Association
NFPA: National Fire Protection Association
NIOSH: National Institute for Occupational Safety and Health
NSC: National Safety Council
OSHA: Occupational Safety and Health Administration
PMA: Precision Metalforming Association
RIA: Robotic Industries Association
SME: Society of Manufacturing Engineers
SPE: Society of Plastics Engineers
Thomas: Thomas Industrial Search Engine
UL: Underwriters Laboratories
WMMA: Wood Machinery Manufacturers of America