This standard covers the mechanical and material requirements for eight property classes of steel@ externally threaded metric fasteners in sizes M1.6 thru M36@ inclusive@ and suitable for use in automotive and related applications. Products included are bolts@ screws@ studs@ U-bolts@ pre-assembled screw and washer assemblies (sems)@ and products manufactured the same as sems except without washer. Products not covered are tapping screws@ thread rolling screws@ and self-drilling screws. Mechanical and material requirements for these products are covered in other SAE documents. The term stud as referred to herein applies to a cylindrical rod of moderate length@ threaded on either one or both ends or throughout its entire length. It does not apply to headed@ collared@ or similar products which are more closely characterized by requirements shown herein for bolts. For specification purposes@ this standard treats U-bolts as studs. Thus@ wherever the word studs appears@ U-bolts is also implied. U bolts covered by this standard are those used primarily in the suspension and related areas of vehicles. (Designers should recognize that the U configuration may not sustain a load equivalent to two bolts or studs of the same size and grade; thus actual load carrying capacity of U-bolts should be determined by saddle load tests.)