The Nut,plain,cap, cataloged under National Stock Number 5310-01-503-1091, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Carver Pump Company. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-503-1091 |
| Primary Part Number | 783-0875-221 |
| Item Name | Nut,plain,cap |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Carver Pump Company |
| Status | ACTIVE |
| Thread Series | UNF |
| Material Document and Classification | ASTM-B-446, GRADE 1 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.875 INCHES IN |
| Nut Style | CAP |
| Thread Quantity Per Inch | 14 |
| Material | NICKEL ALLOY 625 OVERALL |
| Bearing Surface Type | CHAMFERED |
| 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 |
|---|---|
| N-999-6301-B-005 ITEM 28 | Carver Pump Company (USA) |
| 783-0875-221 PRIMARY | Carver Pump Company (USA) |
| Reference | Meaning |
|---|---|
| N-999-6301-B-005 | D/9 Drawing number reference only Carver Pump Company |
| 782-0875-221 | 5/9 Secondary reference Carver Pump Company |
NSN 5310-01-503-1091 is a Nut,plain,cap, manufactured by Carver Pump Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-503-1091 has 2 manufacturer part numbers on file: N-999-6301-B-005 ITEM 28 (Carver Pump Company), 783-0875-221 (Carver Pump Company).
4 possible matches (shared part number, not a government interchangeability claim): 4320-01-503-1711, 4320-01-503-1738, 4320-01-503-1760. Verify interchangeability with system specifications before substitution.
Key specifications for 783-0875-221: Thread Series: UNF; Material Document and Classification: ASTM-B-446, GRADE 1 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Thread Direction: RIGHT-HAND; Nominal Thread Size: 0.875 INCHES 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.