The 2021 Edition IFI Book of Fastener Standards is a convenient compilation the most commonly used fastener standards for inch fasteners and non-ISO metric fasteners. The book contains 92 separate standard specifications issued by ASTM, ASME, SAE and IFI. The 2021 IFI Book of Fastener Standards is the 11th edition of the iconic Book of Standards published by the Industrial Fasteners Institute. This edition represents 80 years of continued development in fastener standards and practice since the first edition was published in 1941. During this period, copies have been distributed to major manufacturing and construction interests throughout the world. The IFI Book of Standards is considered a "BIBLE" for designers, manufacturing engineers, and managers in all industries. The 2021 Edition is the next step in continuing a tradition of dedicated service to the fastener supplying industry and the companies they serve.