The Nut Spacer,plate, cataloged under National Stock Number 5310-01-229-9981, 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. Government technical data includes 7 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-229-9981 |
| Primary Part Number | F49249-4FB |
| Item Name | Nut Spacer,plate |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Plate Thickness | 0.028 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN |
| Plate Width | 0.554 INCHES MAXIMUM IN |
| Mounting Hole Arrangement Style | 2 HOLES |
| Material Document and Classification | AMS5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Surface Treatment | PASSIVATE OVERALL |
| Material | IRON ALLOY 660 OVERALL |
| Nut Mounting Provision | STRAIGHT HOLES |
| 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 |
|---|---|
| F49249-4FB PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| ST3M443-4D PRIMARY | The Boeing Company Div Defense (USA) |
| BFN443-4RT PRIMARY | Bristol Industries, Llc (USA) |
| Reference | Meaning |
|---|---|
| 10110180 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| ST3M443-40 | 5/9 Secondary reference The Boeing Company Div Defense |
| F18421-04 | 5/9 Secondary reference Harvard Industries Inc |
| F18421-04 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-229-9981 is a Nut Spacer,plate, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-229-9981 has 3 manufacturer part numbers on file: F49249-4FB (Howmet Global Fastening Systems Inc), ST3M443-4D (The Boeing Company Div Defense), BFN443-4RT (Bristol Industries, Llc).
Key specifications for F49249-4FB: Plate Thickness: 0.028 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN; Plate Width: 0.554 INCHES MAXIMUM IN; Mounting Hole Arrangement Style: 2 HOLES; Material Document and Classification: AMS5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 7 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.