Filter by
System of Measurement
Thread Size
Material
Specifications Met
Locking Type
Military Specification
Finish
Hex Nut Profile
Certification
Thread Spacing
Thread Direction
Thread Type
DFARS Specialty Metals
Export Control Classification Number (ECCN)
REACH
RoHS
Sold As
Drive Style
Performance
Thread Fit
Mil. Spec. Flex-Top Locknuts for Heavy Vibration
![]() |
These locknuts are manufactured and tested to strict U.S. military standards for material and construction. The top section expands to grip the screw on all sides for a stronger hold than both nylon-insert and distorted-thread locknuts. As a result, they're suitable for use in equipment with constant, vigorous vibration, such as engines. These locknuts are reusable a handful of times, but the holding power decreases with each use.
Corrosion-Resistant Stainless Steel
Silver-Plated 18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts won't rust. The silver plating adds lubricity to help them thread on smoothly during installation.
Thread Size | Wd. | Ht. | Mil. Spec. | Specs. Met | Pkg. Qty. | Pkg. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Silver-Plated 18-8 Stainless Steel | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
4-40 | 1/4" | 9/64" | MS21046C04 | NASM21046 | 1 | 000000000 | 000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() Mil. Spec. Flex-Top Locknut for Heavy Vibration Silver-Plated 18-8 Stainless Steel, 4-40 Thread Size, MS21046C04 Pack of 1Delivers tomorrow | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||