MS21043 Self-Locking Jet Nuts (800 °F A286)
MS21043 all-metal self-locking hex jet nuts in A286 corrosion-resistant steel with extended washer, rated 800 °F — the hot-section member of the military K-nut family, specified per dash number with thread, grip, width across flats, nut height, washer diameter and torque values.
Last updated: 2026-11
Specifications
Where the MS21042 steel series stops at 450 °F, the MS21043 keeps climbing: the same all-metal self-locking hex jet-nut geometry, made in A286 corrosion-resistant steel — the iron-nickel superalloy (UNS S66286) that holds strength and locking behaviour in the 800 °F class — and drawn with an extended washer face that spreads the bearing load on thin structure and shields the locking feature from fretting against the joint. The series serves engine accessories, exhaust-adjacent brackets, hot ducting and anywhere a nylon-insert nut would be a timing bomb: the all-metal lock does not soften, outgas or creep at temperature. Dash numbers select thread and grip and the collected guide tabulates width across flats, nut height, washer diameter and torque values per size. The engineering decision between the two MS series is purely thermal: identical fastening role, different temperature ceiling — call MS21042 for 450 °F steel service and MS21043 for the 800 °F class, and never let a substitution slide upward silently, because the rating gap is exactly the margin the hot section relies on.
| Standard | MS21043 — nut, self-locking, hex flywheel, 800 °F, A286 corrosion-resistant steel with extended washer |
|---|---|
| Type | All-metal self-locking hex jet (K-)nut with extended washer face |
| Temperature rating | 800 °F continuous service (vs 450 °F for the steel MS21042 series) |
| Selection basis | Per dash number: thread size and grip range, width across flats, nut height, washer diameter, torque value |
| Material basis | A286 CRES (UNS S66286) — precipitation-hardened iron-nickel superalloy |
| Family note | Hot-section sibling of MS21042; same K-nut family as NAS1291 (see NASM21042/NASM21043 for supersession notes) |
Materials
- A286 CRES (UNS S66286), 800 °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 (MS21043 Self-Locking Jet Nuts (800 °F A286)) 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
When must the A286 MS21043 be used instead of the steel MS21042?
Wherever joint temperature approaches or exceeds the 450 °F ceiling of the steel series — engine accessories, exhaust-side brackets, oven and turbine-duct structure. The geometry is the same jet-nut family, but the rating gap is the whole point of the two series: an MS21042 in an 800 °F location fails by losing its locking behaviour and strength exactly when access is hardest. Match the series letter to the temperature class in the engineering data.
What should an RFQ for MS21043 nuts state?
The designation and dash number from the drawing (fixing thread and grip), the 800 °F A286 class callout, any lubrication or plating note for the installed torque, quantity per dash, and certificate requirements. 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