The Ring,piston, cataloged under National Stock Number 2810-00-031-6331, is classified within Federal Supply Class 2810 (Gasoline Reciprocating Engines, Aircraft Prime Mover; and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2810-00-031-6331 |
| Primary Part Number | 188540P20W |
| Item Name | Ring,piston |
| FSC / FSG | 2810 / 28 — Gasoline Reciprocating Engines, Aircraft Prime Mover; and Components |
| Manufacturer | Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp. |
| Status | ACTIVE |
| FSC Application Data | RECIPROCATING ENGINE,AIRCRAFT |
| Bore Diameter Oversize | 0.020 INCHES IN |
| Cross-Sectional Shape Style | PLAIN KEYSTONE, STRAIGHT RADII FACE |
| Joint Style | VERTICAL JOINT |
| Radial Wall Thickness | 0.1750 INCHES MINIMUM AND 0.1850 INCHES MAXIMUM IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 5.500 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 |
|---|---|
| 188540P20W PRIMARY | Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp. (CAN) |
| 188540P020W | Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp. (CAN) |
| Reference | Meaning |
|---|---|
| 188540P20W | 5/9 Secondary reference Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| 188540P020W | 5/9 Secondary reference Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
NSN 2810-00-031-6331 is a Ring,piston, manufactured by Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp., classified under FSC 2810, Gasoline Reciprocating Engines, Aircraft Prime Mover; and Components. Status: active.
NSN 2810-00-031-6331 has 2 manufacturer part numbers on file: 188540P20W (Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.), 188540P020W (Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.).
Key specifications for 188540P20W: FSC Application Data: RECIPROCATING ENGINE,AIRCRAFT; Bore Diameter Oversize: 0.020 INCHES IN; Overall Width: 0.1190 INCHES MINIMUM AND 0.1200 INCHES MAXIMUM IN; Cross-Sectional Shape Style: PLAIN KEYSTONE, STRAIGHT RADII FACE. 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.