SAE J 429

Mechanical and Material Requirements for Externally Threaded Fasteners

This SAE Standard covers the mechanical and material requirements for inch-series steel bolts, screws, studs, screws for sems1, and U-bolts2 in sizes to 1-1/2 in. inclusive. 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. The mechanical properties included in Table 1 were compiled at an ambient temperature of approximately 20 °C (68 °F). These properties are valid within a temperature range which depends upon the material grade used and thermal and mechanical processing. Other properties such as fatigue behavior, corrosion resistance, impact properties, etc., are beyond the scope of this document and responsibility for ensuring the acceptability of the product for applications where conditions warrant consideration of these other properties shall be borne by the end user. Allow higher S and P percentages in alloy steel than allowed in Table 2 for manufacturing Grade 8 screws and bolts by hot forging or machining from bar. As an example, this enables producers of Grade 8 bolts and screws to use SAE 4140 steel that might not otherwise be acceptable for hot forging and machining from bar. The S and P values in Table 2 must be adhered to for all cold formed fasteners.