The Washer,flat, cataloged under National Stock Number 5310-00-285-6159, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Drs Environmental Systems Inc. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-285-6159 |
| Primary Part Number | T0633 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Drs Environmental Systems Inc |
| Status | ACTIVE |
| Overall Diameter | 1.000 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | RUBBER NATURAL OR RUBBER SYNTHETIC OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.240 INCHES NOMINAL IN |
| Thickness | 0.062 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 |
|---|---|
| T0633 PRIMARY | Drs Environmental Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| T0633 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5310-00-285-6159 is a Washer,flat, manufactured by Drs Environmental Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-285-6159 has 1 manufacturer part number on file: T0633 (Drs Environmental Systems Inc).
1 possible match (shared part number, not a government interchangeability claim): 3110-01-605-8894. Verify interchangeability with system specifications before substitution.
Key specifications for T0633: Overall Diameter: 1.000 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Special Features: MUST REMAIN FLEXIBLE AT MINUS 65 DEG F TO PLUS 140 DEG F DEGF; Peripheral Shape Style: ROUND. 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.