The Washer,flat, cataloged under National Stock Number 5310-00-270-2172, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is L & L Boiler Maintenance Inc. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-270-2172 |
| Primary Part Number | 4424 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | L & L Boiler Maintenance Inc |
| Status | ACTIVE |
| Overall Diameter | 0.344 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | ZINC OVERALL |
| Peripheral Shape Style | ROUND |
| Material | COPPER ALLOY OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.142 INCHES MINIMUM AND 0.148 INCHES MAXIMUM IN |
| Thickness | 0.031 INCHES NOMINAL IN |
| 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 |
|---|---|
| D2458 | Fairbanks Morse, Llc (USA) |
| 4424 PRIMARY | L & L Boiler Maintenance Inc (USA) |
| Reference | Meaning |
|---|---|
| D2458 | 5/9 Secondary reference U.S. Government activity |
| 55985 | 5/2 Secondary reference U.S. Government activity |
| WPP2633 | 5/9 Secondary reference Siemens Water Technologies Corp. Div Wallace & Tiernan Products |
| 4424 | 5/9 Secondary reference D & J Parts Inc |
NSN 5310-00-270-2172 is a Washer,flat, manufactured by L & L Boiler Maintenance Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-270-2172 has 2 manufacturer part numbers on file: D2458 (Fairbanks Morse, Llc), 4424 (L & L Boiler Maintenance Inc).
2 possible matches (shared part number, not a government interchangeability claim): 5330-00-524-5135, 1650-00-672-2207. Verify interchangeability with system specifications before substitution.
Key specifications for 4424: Overall Diameter: 0.344 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Surface Treatment: ZINC OVERALL; Peripheral Shape Style: ROUND. 8 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.