ASME B18.6.8-2010 (R2017) PDF
1.1 Scope
1.1.1 This Standard covers the general and dimensional data for the various types of thumb screws and wing screws recognized as standard.
1.1.2 The inclusion of dimensional data in this Standard is not intended to imply that all of the products described are stock production sizes. Purchasers must consult with suppliers concerning stock sizes.