The Nut,self-Locking,plate, cataloged under National Stock Number 5310-01-054-0840, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Div Tridair Products. Government technical data includes 29 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-054-0840 |
| Primary Part Number | CA21021 |
| Item Name | Nut,self-Locking,plate |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc. Div Tridair Products |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Plate Thickness | 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM IN |
| Nut Length | 0.790 INCHES MINIMUM AND 0.824 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE SHELL |
| Surface Treatment Document and Classification | QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE NUT |
| Thread Series | UNF |
| Plate Width | 0.535 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN |
| Mounting Hole Arrangement Style | 2 HOLES |
| Removable Nut Manufacturer Part Number | CA21021-1 |
| Material Document and Classification | AMS5528,17-7PH ASSN STD SINGLE MATERIAL RESPONSE SHELL |
| Material Document and Classification | MIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE NUT |
| Mounting Hole Diameter | 0.098 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN |
| Nut Counterbore Depth | 0.215 INCHES MINIMUM AND 0.245 INCHES MAXIMUM BASE IN |
| Features Provided | FLOATING NUT |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Distance From Aperture Center to Mounting Hole Center | 0.342 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Center to Center Distance Between Mounting Holes Along Length | 0.685 INCHES MINIMUM AND 0.689 INCHES MAXIMUM IN |
| Nut Height | 0.496 INCHES MINIMUM AND 0.536 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM NUT |
| Surface Treatment | PASSIVATE SHELL |
| Nut Style | PLATE |
| Thread Class | 3B |
| Thread Quantity Per Inch | 28 |
| Material | STEEL CORROSION RESISTING SHELL |
| Material | STEEL COMP 8740 OR STEEL COMP 4140 NUT |
| Nut Mounting Provision | STRAIGHT HOLES |
| Removable Nut Manufacturer Code | 29372 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| CA21021 PRIMARY | Howmet Global Fastening Systems Inc. Div Tridair Products (USA) |
| 120003-4 PRIMARY | Monadnock Company, the Dba Lisi Aerospace (USA) |
| CA21021 | Fairchild Fasteners Europe - Camloc Gmbh (DEU) |
| Reference | Meaning |
|---|---|
| CA1021 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc. Div Tridair Products |
| 5310PL2215059 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| C7983-4 | 7/2 Vendor item drawing reference U.S. Government activity |
| 913003 | 5/9 Secondary reference Lockheed Martin Corp Electronics and Missiles Div |
| 5310PL2215517 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 5310PL0743475 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5310-01-054-0840 is a Nut,self-Locking,plate, manufactured by Howmet Global Fastening Systems Inc. Div Tridair Products, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-054-0840 has 3 manufacturer part numbers on file: CA21021 (Howmet Global Fastening Systems Inc. Div Tridair Products), 120003-4 (Monadnock Company, the Dba Lisi Aerospace), CA21021 (Fairchild Fasteners Europe - Camloc Gmbh).
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-280-8179, 5365-01-344-4907, 5310-01-734-0218. Verify interchangeability with system specifications before substitution.
Key specifications for CA21021: Lubrication: DRY FILM LUBRICANT; Plate Thickness: 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM IN; Nut Length: 0.790 INCHES MINIMUM AND 0.824 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE SHELL. 29 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.