The Ring,piston, cataloged under National Stock Number 4310-00-554-1526, is classified within Federal Supply Class 4310 (Compressors and Vacuum Pumps) of the Pumps and Compressors group. The manufacturer of record is Hunt Valve Company, Inc.. Government technical data includes 7 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4310-00-554-1526 |
| Primary Part Number | D25173 |
| Item Name | Ring,piston |
| FSC / FSG | 4310 / 43 — Compressors and Vacuum Pumps |
| Manufacturer | Hunt Valve Company, Inc. |
| Status | ACTIVE |
| FSC Application Data | PISTON,VALVE,REGULATING,FLUID PRESSURE |
| Cross-Sectional Shape Style | PLAIN RECTANGULAR, STRAIGHT FACE |
| Joint Style | VERTICAL JOINT |
| Radial Wall Thickness | 0.0650 INCHES MINIMUM AND 0.0750 INCHES MAXIMUM IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 2.625 INCHES IN |
| Material | IRON OVERALL |
| 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 |
|---|---|
| D25173 PRIMARY | Hunt Valve Company, Inc. (USA) |
| AA23657PC11 | Hunt Valve Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| AA23657PC11 | 5/9 Secondary reference Hammel Dahl Inc |
| D25173 | 5/9 Secondary reference Hammel Dahl Inc |
| AA23657PC11 | 5/9 Secondary reference Hunt Valve Company Inc Dba Union Flonetics |
| D25173 | 3/9 Design control — primary reference Hunt Valve Company Inc Dba Union Flonetics |
NSN 4310-00-554-1526 is a Ring,piston, manufactured by Hunt Valve Company, Inc., classified under FSC 4310, Compressors and Vacuum Pumps. Status: active.
NSN 4310-00-554-1526 has 2 manufacturer part numbers on file: D25173 (Hunt Valve Company, Inc.), AA23657PC11 (Hunt Valve Company, Inc.).
Key specifications for D25173: FSC Application Data: PISTON,VALVE,REGULATING,FLUID PRESSURE; Overall Width: 0.9250 INCHES MINIMUM AND 0.9350 INCHES MAXIMUM IN; Cross-Sectional Shape Style: PLAIN RECTANGULAR, STRAIGHT FACE; Joint Style: VERTICAL JOINT. 7 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.