NATO Stock Number
5305-00-042-3553
Sold in multiples of
1 HD
DEMIL
NO
Thread Class
2a
Thread Direction
Right-hand
Thread Length
Between 0.244 inches and 0.344 inches
Fastener Length
Between 0.344 inches and 0.375 inches
Head Style
Hexagon
Head Height
Between 0.172 inches and 0.190 inches
Width Between Flats
Between 0.428 inches and 0.437 inches
Washer Quantity
1
Internal Drive Style
Slot
Thread Diameter
0.250 inches
Thready Qty Per Inch (tpi)
20
Primary Washer Outside Diameter
Between 0.460 inches and 0.475 inches
Primary Washer Style
Flat external teeth
Primary Washer Material Thickness
Between 0.023 inches and 0.028 inches
Material
Steel comp 1010 or steel comp 1020 or steel comp 1050
Material Specification
Sae assn standard all material responses
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
