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NAS680A4K

Two Lug Locknut Plate

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Description

Thread Size: 1/4", Nut Length: 1-1/4", Nut Height: 9/32

Specifications

Center To Center Distance Between Mounting Holes Along Length 0.998 inches minimum and 1.002 inches maximum
Counterbore Diameter 0.254 inches minimum nut
Distance From Aperture Center To Mounting Hole Center 0.495 inches minimum and 0.505 inches maximum
Hardness Rating 49.0 rockwell c maximum
Locking Feature Prevailing torque all metal design
Lubrication Dry film lubricant
Material Steel
Mounting Hole Arrangement Style 2 holes
Mounting Hole Countersink Angle 98.0 degrees minimum and 102.0 degrees maximum
Mounting Hole Diameter 0.098 inches minimum and 0.103 inches maximum
Mounting Provision Location Opposite nut projection side
Nut Counterbore Depth 0.062 inches minimum nut
Nut Height 0.281 inches maximum
Nut Length 1.260 inches maximum
Nut Mounting Provision Countersunk holes
Nut Style Plate
Plate Thickness 0.055 inches maximum
Plate Width 0.375 inches minimum and 0.414 inches maximum
Surface Treatment Cadmium
Surface Treatment Specification Qq-p-416 fed spec single treatment response
Temperature Rating 450.0 deg fahrenheit maximum
Thread Class 3b
Thread Direction Right-hand
Thread Qty 28
Thread Qty Per Inch (tpi) 28
Thread Series UNJF
Thread Size 0.250

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Catalog data updated 2026-07-05. Report a data error