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MS21042 All-Metal Hex Stop Nuts
Picture for identification; check the listing for the exact item.

Bolts, nuts & washers

MS21042 All-Metal Stop Nuts

The reduced-height all-metal locknut, for temperatures a fiber-insert nut cannot take.

  • TypeAll-metal self-locking hex nut, reduced height

Where to buy

AmericaDistributor coming soonOur partner for this region is on its way
EuropeDistributor coming soonOur partner for this region is on its way
OceaniaDistributor coming soonOur partner for this region is on its way

Distributor? Get listed →

More distributors

AmericaMore distributors coming soon
EuropeMore distributors coming soon
OceaniaMore distributors coming soon

Spruce notes it is shorter than the AN363 but develops the same tensile strength. Where temperature is not the issue, the fiber-insert AN365 is the common choice.

Bolts: AN3, AN4.

Specifications

TypeAll-metal self-locking hex nut, reduced height
Temperature (listed)Up to 450 °F
VersionsDry, and dry-film lubed (dark grey)

Source: a distributor's listing, checked 2026-09-30.

Sizes listed 14 rows
TypePart No.Thread
Dry Hex Nut04-040604-40
Dry Hex NutMS21042-066-32
Dry Hex NutMS21042-088-32
Dry Hex NutMS21042-310-32
Dry Hex NutMS21042-41/4-28
Dry Hex NutMS21042-55/16-24
Dry Hex NutMS21042-63/8-24
Lubed Hex NutMS21042-L044-40
Lubed Hex NutMS21042-L066-32
Lubed Hex NutMS21042-L088-32
Lubed Hex NutMS21042-L310-32
Lubed Hex NutMS21042-L41/4-28
Lubed Hex NutMS21042-L55/16-24
Lubed Hex NutMS21042-L63/8-24

Questions people actually ask

Where can I buy the MS21042 All-Metal Hex Stop Nuts?

A distributor we checked lists it in the Americas. The link to its page, with the live price and stock, opens when the partnership does.

More bolts, nuts & washers

MS21042 All-Metal Hex Stop NutsWhere to buy
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