The Washer,flat, cataloged under National Stock Number 5310-00-264-0723, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Triman Industries Inc. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 13 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 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 | 5310-00-264-0723 |
| Primary Part Number | N2311 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Triman Industries Inc |
| Status | ACTIVE |
| Overall Diameter | 1.000 INCHES NOMINAL IN |
| Material Document and Classification | MIL-B-944 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | COPPER ALLOY OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.505 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN |
| Thickness | 0.188 INCHES MINIMUM AND 0.219 INCHES MAXIMUM 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 |
|---|---|
| N2311 | Weil Pump Co Inc (USA) |
| S1049PC15 | Weil Pump Co Inc (USA) |
| A496PC15 | Weil Pump Co Inc (USA) |
| S1048PC15 | Weil Pump Co Inc (USA) |
| S1050PC15 | Weil Pump Co Inc (USA) |
| S1143PC15 | Weil Pump Co Inc (USA) |
| A494PC15 | Weil Pump Co Inc (USA) |
| S1047PC15 | Weil Pump Co Inc (USA) |
| A611PC15 | Weil Pump Co Inc (USA) |
| S1046PC15 | Weil Pump Co Inc (USA) |
| A497PC15 | Weil Pump Co Inc (USA) |
| N2311 PRIMARY | Triman Industries Inc (USA) |
| FS-W-92B-TYII-ST2-EXMAT &DIM PRIMARY | Triman Industries Inc (USA) |
NSN 5310-00-264-0723 is a Washer,flat, manufactured by Triman Industries Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-264-0723 has 13 manufacturer part numbers on file: N2311 (Weil Pump Co Inc), S1049PC15 (Weil Pump Co Inc), A496PC15 (Weil Pump Co Inc), S1048PC15 (Weil Pump Co Inc), S1050PC15 (Weil Pump Co Inc) and 8 more.
1 possible match (shared part number, not a government interchangeability claim): 5365-01-251-2079. Verify interchangeability with system specifications before substitution.
Key specifications for N2311: Overall Diameter: 1.000 INCHES NOMINAL IN; Material Document and Classification: MIL-B-944 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Special Features: 0.125 IN. RADIUS ON ONE BEARING SURFACE IN. 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.