This specification establishes allowable limits for the various types of surface discontinuities that may occur during the manufacture and processing of bolts, screws, and studs, including heat-treated machine screws, tapping screws, and sems. Types of surface discontinuities are: crack; burst; seam; fold; thread lap; void; tool marks; and gouge and nick. These surface discontinuities shall be inspected in accordance with the specified requirements. This specification covers metric series products with nominal diameters of 4 mm and larger and with specified minimum tensile strengths of 420 MPa and higher; and inch series products with nominal diameters of No. 5 (0.1250 in.) and larger and with specified minimum tensile strengths of 60,000 psi and higher.
KeywordsBolts - Bolts, Screws, and Studs - Studs - Surface Defects - Tensile Strength
ICS CODE21.060.10 (Bolts, screws, studs)
UNSPSC CODE31160000 (Hardware)
ASTM F788-13(2018), Standard Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series, ASTM International, West Conshohocken, PA, 2018, www.astm.org