NATO Stock Number
5305-00-591-3388
Sold in multiples of
1 HD
DEMIL
NO
Thread Class
2a
Thread Direction
Right-hand
Thread Length
0.250 inches
Fastener Length
0.312 inches
Head Style
Pan no. 2
Head Diameter
Between 0.256 inches and 0.270 inches
Head Height
Between 0.072 inches and 0.082 inches
Washer Quantity
1
Internal Drive Style
Slot
Thread Diameter
0.138 inches
Thready Qty Per Inch (tpi)
32
Hardness Rating
40.0 rockwell c primary washer and 50.0 rockwell c primary washer
Primary Washer Outside Diameter
Between 0.278 inches and 0.288 inches
Primary Washer Style
Flat internal teeth
Primary Washer Material Thickness
0.018 inches
Material
Steel comp 1010 fastener
Material
Steel comp 1050 primary washer or steel comp 1060 primary washer
Surface Treatment
Cadmium or zinc
Surface Treatment Specification
Qq-p-416, type 1, cl 3 federal specification 1st treatment response or qq-z-325, type 1, cl 3 federal specification 2nd treatment response
Thread Series Designator
Unc
