The Valve,ball, cataloged under National Stock Number 4820-01-423-1971, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Swagelok Co. Government technical data includes 12 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-423-1971 |
| Primary Part Number | SS-63TMS8-33C |
| Item Name | Valve,ball |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Swagelok Co |
| Status | ACTIVE |
| Connection Style | PLAIN (PIPE) ALL ENDS |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Valve Size | 0.750 INCHES IN |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.750 INCHES ALL ENDS IN |
| Maximum Operating Temp | 200.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Face to Face Distance | 2.688 INCHES IN |
| Material | STEEL COMP 316 STEM |
| Material | COPPER ALLOY AND STEEL AND STEEL CORROSION RESISTING BODY |
| Thread Series Designator | NPT ALL ENDS |
| Valve Operation Method | MANUAL |
| 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 |
|---|---|
| 8230644-0701 | Honeywell International Inc Div Aerospace-South Bend (bendix Dr) (USA) |
| SS-63TMS8-33C PRIMARY | Swagelok Co (USA) |
| Reference | Meaning |
|---|---|
| 8230644 | 7/1 Vendor item drawing reference Honeywell International Inc Div Aerospace-South Bend (bendix Dr) |
| SS-63TMS8-33C | 5/9 Secondary reference Whitey Co |
NSN 4820-01-423-1971 is a Valve,ball, manufactured by Swagelok Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-423-1971 has 2 manufacturer part numbers on file: 8230644-0701 (Honeywell International Inc Div Aerospace-South Bend (bendix Dr)), SS-63TMS8-33C (Swagelok Co).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-423-2869. Verify interchangeability with system specifications before substitution.
Key specifications for SS-63TMS8-33C: Connection Style: PLAIN (PIPE) ALL ENDS; Connection Type: THREADED INTERNAL PIPE ALL ENDS; Style Designator: STRAIGHT THRU FLANGED ENDS; Valve Size: 0.750 INCHES IN. 12 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.