This SAE Standard covers the mechanical and quality requirements for steel bolts, screws, studs, and sems used in automotive and related industries in sizes to 1½ in, inclusive. This standard does not include limits for surface discontinuities. Where usage requires such control, limits may be specified separately. For certain type, size, and length of products this may be done by the statement: “Surface discontinuities shall not exceed the limits shown in SAE J123.” NOTE: Previous issues of this standard also covered nuts, now covered separately in SAE J995.