The Pin,piston, cataloged under National Stock Number 4310-00-351-2121, is classified within Federal Supply Class 4310 (Compressors and Vacuum Pumps) of the Pumps and Compressors group. The manufacturer of record is Quincy Compressor Division of Coltec Industries Inc Dba Quincy Compressor Div Quincy Compressor. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4310-00-351-2121 |
| Primary Part Number | 1937X |
| Item Name | Pin,piston |
| FSC / FSG | 4310 / 43 — Compressors and Vacuum Pumps |
| Manufacturer | Quincy Compressor Division of Coltec Industries Inc Dba Quincy Compressor Div Quincy Compressor |
| Status | ACTIVE |
| Body Style | PLAIN ENDS |
| Outside Diameter | 0.87470 INCHES MINIMUM AND 0.87490 INCHES MAXIMUM IN |
| Plug Type | PIN RETAINING |
| Body Length | 1.6250 INCHES NOMINAL IN |
| Casehardening Indicator | CASEHARDENED |
| Metallic Hardness Rating | 64.0 MINIMUM ROCKWELL SUPERFICIAL 45-N AND 70.0 MAXIMUM ROCKWELL SUPERFICIAL 45-N |
| 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 |
|---|---|
| 1937X PRIMARY | Quincy Compressor Division of Coltec Industries Inc Dba Quincy Compressor Div Quincy Compressor (USA) |
NSN 4310-00-351-2121 is a Pin,piston, manufactured by Quincy Compressor Division of Coltec Industries Inc Dba Quincy Compressor Div Quincy Compressor, classified under FSC 4310, Compressors and Vacuum Pumps. Status: active.
NSN 4310-00-351-2121 has 1 manufacturer part number on file: 1937X (Quincy Compressor Division of Coltec Industries Inc Dba Quincy Compressor Div Quincy Compressor).
Key specifications for 1937X: Body Style: PLAIN ENDS; Overall Length: 1.906 INCHES NOMINAL IN; Outside Diameter: 0.87470 INCHES MINIMUM AND 0.87490 INCHES MAXIMUM IN; Plug Type: PIN RETAINING. 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.