The Washer,flat, cataloged under National Stock Number 5310-01-173-9549, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer. Government technical data includes 5 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. 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 | 5310-01-173-9549 |
| Primary Part Number | 350402 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer |
| Status | ACTIVE |
| Material Document and Classification | QQ-C-576 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | COPPER ALLOY 110 OR COPPER ALLOY 113 OR COPPER ALLOY 114 OR COPPER ALLOY 116 OR COPPER ALLOY 120 OR COPPER ALLOY 121 OR COPPER ALLOY 122 OR COPPER ALLOY 123 OR COPPER ALLOY 125 OR COPPER ALLOY 127 OR COPPER ALLOY 128 OR COPPER ALLOY 130 OVERALL |
| Center Hole Shape Style | ROUND |
| 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 |
|---|---|
| E-3964REVL PIECE 29 | Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer (USA) |
| 350402 PRIMARY | Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer (USA) |
NSN 5310-01-173-9549 is a Washer,flat, manufactured by Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-173-9549 has 2 manufacturer part numbers on file: E-3964REVL PIECE 29 (Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer), 350402 (Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer).
1 possible match (shared part number, not a government interchangeability claim): 1730-01-289-9337. Verify interchangeability with system specifications before substitution.
Key specifications for 350402: Material Document and Classification: QQ-C-576 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND; End Item Identification: LOGISTICS SUPPORT VESSEL. 5 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.