MS21042 Self-Locking Jet Nuts (450 °F Steel)
MS21042 all-metal self-locking hex jet nuts in corrosion- and heat-resistant steel, rated 450 °F service at 160 KSI — the military-standard counterpart to the NASM21042/NAS1291 aerospace series, specified per dash number with thread, grip, width across flats, nut height, washer diameter and torque values.
Last updated: 2026-11
Specifications
The MS21042 jet nut is the compact all-metal lock nut of military-aerospace practice: a hex nut with a collared, chamfered body and an all-metal locking feature, named for its origin on jet engines where nylon inserts die young. The series is rated 450 °F service at 160 KSI tensile in corrosion- and heat-resistant steel, and the standard sheet text describes it as self-locking, sheet-metal class, hex flywheel nuts — the thin-wall, extended-grip geometry that lets a lock nut live where envelope height is scarce. Dash numbers run the familiar K-nut ladder and select, per size: the thread and grip range, width across flats, nut height, washer (flange) diameter and the installation torque value; the collected guide tabulates these per dash number. MS21042 sits in the same family as the NAS1291 page on this site — the NASM21042/NASM21043 redesignations superseded parts of the older dash ladders — and the choice between them is a drawing-callout question, not a performance race: match the series your engineering data cites. All-metal locking means the nut is removed and reused only within its locking-torque limits, and temperature class is part of the callout: the 800 °F applications belong to the A286 MS21043, not this steel series.
| Standard | MS21042 — nut, self-locking, sheet metal, hex flywheel, 450 °F, 160 KSI, corrosion/heat-resistant steel |
|---|---|
| Type | All-metal self-locking hex jet (K-)nut, collared with chamfered washer face |
| Temperature / strength rating | 450 °F continuous service; 160 KSI tensile basis |
| Selection basis | Per dash number: thread size and grip range, width across flats, nut height, washer diameter, torque value |
| Family note | Counterpart to the NAS1291/NASM21042 aerospace series (see NASM21042/NASM21043 for inactive-dash supersessions); 800 °F service uses the A286 MS21043 |
Materials
- Corrosion- and heat-resistant steel (450 °F class)
Ordering & documentation
Documents
Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.
Quotation
- The fastener family (MS21042 Self-Locking Jet Nuts (450 °F Steel)) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
- Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
- Quantity per size and your target delivery date.
- Destination country, and any required documents (for example a mill test certificate) so the quote includes them.
Sample & supply
Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.
Storage & shipping
Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.
Frequently asked questions
MS21042 or NAS1291 — which lock nut does my drawing mean?
Whichever the drawing cites: they are sibling series in the same K-nut family, and the dash-number ladders overlap but are not interchangeable part-for-part. MS21042 is the military-standard steel 450 °F / 160 KSI jet nut; NAS1291 is the NAS part standard with steel (450 °F) and A286 (450/800 °F) variants, several of whose smallest dashes were inactivated in favour of the NASM21042/NASM21043 redesignations. Quote the cited designation and dash number, not a "close equivalent".
What should an RFQ for MS21042 nuts state?
The designation and dash number from the engineering drawing, which fixes thread and grip; temperature class confirmation (450 °F steel series — 800 °F needs MS21043); any plating or lubrication callout; quantity per dash; and whether certificates accompany the parts. Per-dash dimensions and torque values are confirmed with the quotation.
What is the MOQ and lead time for this nut type?
The minimum order quantity is 10,000 pieces. Stock items ship in 3–7 days; non-stock items are confirmed at quotation. Confirm the exact schedule against quantity and size mix at quotation.
Request a Quote
Get factory-direct pricing from the manufacturer.
What to include in your inquiry
- ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
- ✓ Sizes, lengths and thread type (metric or inch).
- ✓ Quantity per size and your target delivery date.
- ✓ Destination country, plus any coating or finish requirement.
- ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
- ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
- ✓ Factory-direct pricing
- ✓ Standard and custom specifications
- ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
- ✓ Full fastener family support