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MS21051L4K

Military Standard Locknut

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Description

Thread Size: 1/4", Nut Length: 1", Nut Height: 1/4

Specifications

Center To Center Distance Between Mounting Holes Along Length Between 0.310 inches and 0.314 inches
Counterbore Diameter 0.254 inches nut
Distance From Aperture Center To Mounting Hole Center Between 0.339 inches and 0.349 inches
Hardness Rating 49.0 rockwell c
Locking Feature Prevailing torque all metal design
Lubrication Dry film lubricant
Material Steel
Mounting Hole Arrangement Style 2 holes
Mounting Hole Countersink Angle Between 98.0 degrees and 102.0 degrees
Mounting Hole Diameter Between 0.098 inches and 0.103 inches
Mounting Provision Location Opposite nut projection side
Nut Counterbore Depth 0.062 inches nut
Nut Height 0.281
Nut Length 0.993
Nut Mounting Provision Countersunk holes
Nut Style Plate
Plate Thickness 0.055
Plate Width Between 0.375 inches and 0.414 inches
Surface Treatment Cadmium
Surface Treatment Specification Qq-p-416 federal specification single treatment response
Temperature Rating 450.0 degrees fahrenheit
Thread Class 3b
Thread Direction Right-hand
Thread Qty 28
Thread Qty Per Inch (tpi) 28
Thread Series Unjf (fine thread with external controlled root radius)
Thread Size 0.250

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