Ship Systems and Equipment—Part Standard for Studs—Continuous and Double End (Inch Series) J2271_200905

This SAE Parts Standard provides dimensional and quality assurance requirements for studs in the following configurations in standard materials used for ship system applications:

a
Continuous thread studs in UNRC and 8UNR series in the following threads and diameters:
- UNRC threads (1/4 through 4 inches)
- UNRF threads (1/4 through 1-1/2 inches)
- 8UNR threads (1-1/8 through 4 inches)
b
Double end studs (clamping type) where both ends are of the same minimum thread length in the following threads and diameters:
- UNRC threads (1/4 through 4 inches)
- UNRF threads (1/4 through 1-1/2 inches)
- 8UNR threads (1-1/8 through 4 inches)
Different thread forms on each end are permissible.

Double end studs (tap end type) where the tap end thread length is equivalent to 1-1/2 nominal diameters:

Tap End Thread Forms and Diameters	Nut End Thread Forms and Diameters
NC-5 interference-fit tap end threads (1/4 through 1-1/2 inches)
UNRC threads (1/4 through 4 inches)	UNRC threads (1/4 through 4 inches)
UNRF threads (1/4 through 1-1/2 inches)	UNRF threads (1/4 through 1-1/2 inches)
8UNR threads (1-1/8 through 4 inches)	8UNR threads (1-1/8 through 4 Inches)