Serving our customers with quality and safety first.
3a
RIGHT-Hand
0.313in. ⁓21/64"
0.390in. and 0.396in. ⁓13/32"
flat countersunk
0.387in. and 0.393in.
slot
0.250in. ⁓1/4"
28
82.0 degrees
navy special project
copper alloy
QQ-B-613 fed spec single material response or QQ-W-321 fed spec single material response
unf
Unf
28
Flat countersunk
0.313 inches minimum
Right-hand
3a
Schedule B number: 7415338550
nmfc 096630
Other copper screws (not for wood) bolts and nuts
FSC 5305 ⁓ Screws
unf thread series navy special project 28 thread quantity per inch flat countersunk head style 0.313" thread length right-hand 3a thread class
Nothing similar to this part number was found in our inventory
An externally threaded fastener whose threaded portion is of one nominal diameter, no 0 (0.060 in./1.5 mm) or larger, designed to be held or driven with either a wrench or an inserted driver or both (excluding internal socket or internal multiple spline types), in sizes below no. 10 (0.190 in./5 mm). no. 10 and larger sizes must have a head designed for any type inserted driver (excluding internal socket or internal multiple spline types), but may also be designed for external wrenching. a locking feature may be incorporated in the design of the head or threads. excludes bolt, clevis; bolt, externally relieved body; screw, externally relieved body; and screw, assembled washer. see also, screw, instrument; bolt, machine; bolt, internal wrenching; and screw, cap socket head.