The Strainer Element,sediment, cataloged under National Stock Number 4730-01-431-6637, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Staples & Pfeiffer, Inc.. Government technical data includes 5 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-431-6637 |
| Primary Part Number | 631A-3IN-25.145M |
| Item Name | Strainer Element,sediment |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Staples & Pfeiffer, Inc. |
| Status | ACTIVE |
| Filtering Media Design | MESH OR PERFORATED |
| End Connection Type | FLANGE W/BAIL FIRST END |
| End Connection Type | PLAIN SECOND END |
| Style Designator | CYLINDRICAL |
| Material | NICKEL ALLOY |
| 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 |
|---|---|
| 631A-3IN-25.145M PRIMARY | Staples & Pfeiffer, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 631A-3IN-25-.14 | C/1 Advisory reference — outside the item-of-supply concept Staples & Pfeiffer, Inc. |
| 631A | D/9 Drawing number reference only Staples & Pfeiffer, Inc. |
| 123YF-3IN-25 | 5/9 Secondary reference Staples & Pfeiffer, Inc. |
NSN 4730-01-431-6637 is a Strainer Element,sediment, manufactured by Staples & Pfeiffer, Inc., classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-431-6637 has 1 manufacturer part number on file: 631A-3IN-25.145M (Staples & Pfeiffer, Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 4730-01-559-0371, 4730-01-559-0388. Verify interchangeability with system specifications before substitution.
Key specifications for 631A-3IN-25.145M: Filtering Media Design: MESH OR PERFORATED; End Connection Type: FLANGE W/BAIL FIRST END; End Connection Type: PLAIN SECOND END; Style Designator: CYLINDRICAL. 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.