US INCH STANDARDS & METRICS
Hex Cap Screws have hexagonal heads and machine threads for use with a nut or in a tapped hole. They are generally used in precise applications such as OEM settings where tight tolerances are required. The most common grades for Inch Standard Hex Cap Screws are 2, 5 and 8.
Some of the basic features of a Hex Cap Screws are as follows:
- Flat washer facing under the head that meets specific tolerances outlined in ASME B18.2.1-1996
- Manufactured by a cold-heading process
- A radius under the head at the shank
- Tighter tolerances than a standard Hex bolt
- No seams across any bearing surfaces
SAE J429 Mechanical and Material Requirements for Externally Threaded Fasteners - covers Grades 1, 2, 5, 5.2, 8 and 8.2
ASME B18.2.1-1996 Square & Hex Bolts and Screws (Inch Series) specifies Hex Cap Screws that range in size from 0.25-3 in (6.35-76.20 mm) in diameter.
ASTM A449 Standard Specification for Quenched and Tempered Steel Bolts and Studs
ASTM F593 Standard Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs
SAE J1199 Mechanical and Material Requirements for Metric Externally Threaded Fasteners
ASME B188.8.131.52M Metric Hex Cap Screws - This Standard covers the complete general and dimensional data for metric series hex cap screws recognized as American National Standard.
DIN 931 Part Thread Hexagon Head Screws
DIN 933 Full Thread Hexagon Head Screws
ISO 4017 Full Thread Hexagon Head Screws