The Ring,piston, cataloged under National Stock Number 4310-00-261-9689, is classified within Federal Supply Class 4310 (Compressors and Vacuum Pumps) of the Pumps and Compressors group. The manufacturer of record is Control Flow, Inc. Dba Control Flow Inc. Government technical data includes 6 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4310-00-261-9689 |
| Primary Part Number | N1871-125 |
| Item Name | Ring,piston |
| FSC / FSG | 4310 / 43 — Compressors and Vacuum Pumps |
| Manufacturer | Control Flow, Inc. Dba Control Flow Inc |
| Status | ACTIVE |
| Cross-Sectional Shape Style | PLAIN RECTANGULAR, STRAIGHT FACE |
| Joint Style | VERTICAL JOINT |
| Radial Wall Thickness | 0.3320 INCHES NOMINAL IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 16.830 INCHES IN |
| Material | STEEL 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 |
|---|---|
| N1871-125 PRIMARY | Control Flow, Inc. Dba Control Flow Inc (USA) |
| Reference | Meaning |
|---|---|
| N1871-125 | 5/9 Secondary reference Control Flow, Inc. Dba Westech Heavy Machinery Division Div Westech Heavy Machinery Division |
| N1871PC125 | 5/9 Secondary reference Control Flow, Inc. Dba Westech Heavy Machinery Division Div Westech Heavy Machinery Division |
NSN 4310-00-261-9689 is a Ring,piston, manufactured by Control Flow, Inc. Dba Control Flow Inc, classified under FSC 4310, Compressors and Vacuum Pumps. Status: active.
NSN 4310-00-261-9689 has 1 manufacturer part number on file: N1871-125 (Control Flow, Inc. Dba Control Flow Inc).
Key specifications for N1871-125: Overall Width: 0.5850 INCHES NOMINAL IN; Cross-Sectional Shape Style: PLAIN RECTANGULAR, STRAIGHT FACE; Joint Style: VERTICAL JOINT; Radial Wall Thickness: 0.3320 INCHES NOMINAL IN. 6 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.