The Seat,valve, cataloged under National Stock Number 4820-01-197-3715, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc. 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-197-3715 |
| Primary Part Number | 51172-R-183 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc |
| Status | ACTIVE |
| Body Outside Diameter | 5.500 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 4.875 INCHES NOMINAL IN |
| Material | NICKEL ALLOY OVERALL |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| 51172-R-183 PRIMARY | Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA) |
| Reference | Meaning |
|---|---|
| 101158 | D/9 Drawing number reference only U.S. Government activity |
| 101158-5IN PART 18 | 5/9 Secondary reference U.S. Government activity |
| 101158-0500-18 | 5/9 Secondary reference U.S. Government activity |
| 101158-0500-18 | 5/9 Secondary reference Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc |
| 101158-5IN PT 18 | 5/9 Secondary reference Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc |
NSN 4820-01-197-3715 is a Seat,valve, manufactured by Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-197-3715 has 1 manufacturer part number on file: 51172-R-183 (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc).
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-197-3726, 4820-01-197-3777, 1630-01-570-4699. Verify interchangeability with system specifications before substitution.
Key specifications for 51172-R-183: Overall Height: 0.188 INCHES NOMINAL IN; Body Outside Diameter: 5.500 INCHES NOMINAL IN; Style Designator: PLAIN; Body Inside Diameter: 4.875 INCHES NOMINAL IN. 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.