The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-00-315-9101, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Pre-Mach Inc. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-315-9101 |
| Primary Part Number | 16-40974-1 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Pre-Mach Inc |
| Status | ACTIVE |
| Second End Relationship with First End | NOT IDENTICAL |
| Face to Face Distance | 3.500 INCHES NOMINAL IN |
| Special Test Features | MATERIAL:PHOSPHORUS BRONZE ASTM-B139,ALLOY C52400,H04,ALTERNATE: ALUMINUM BRONZE ASTM-B-148, ALLOY C95500 AS CAST |
| First End Recess Depth | 0.563 INCHES NOMINAL IN |
| Second Connection Face to Centerline Distance | 3.000 INCHES NOMINAL IN |
| Specification/standard Data | 05047-ANSI / ASME B46.1 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 05047-BB311/2 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 05047-BB312/2 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| First End Connection Type | UNTHREADED EXTERNAL TUBE |
| Material | COPPER ALLOY BODY |
| Media for Which Designed | STEAM |
| Second End Connection Type | PLAIN FACE FLANGE |
| Second End Width Across Flats | 1.125 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 16-40974-1 | Pre-Mach Inc (USA) |
| 16-40974-1 | York Precision Machining and Hydraulics, Llc (USA) |
| 16-40974-1 | Krobach Mfg. Corp. Dba Krobach Manufacturing Corp (USA) |
| 16-40974-1 | Master Research & Manufacturing, Inc. Dba Master Research & Manufacturing Inc (USA) |
| 16-40974-1 | Duhadaway Tool & Die Shop Inc (USA) |
| 16-40974-1 | Sheffield Manufacturing, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 16-40974-1 | 3/2 Design control — primary reference U.S. Government activity |
| 16-40974-1 | 5/9 Secondary reference Wellman Dynamics Machining and Assembly, Inc. |
| 16-40974-1 | 5/9 Secondary reference U.S. Government activity |
| 16-40974-1 | 5/9 Secondary reference Computa-Base-Machining, Inc. |
| 80020-16-40974 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 4820-00-315-9101 is a Valve,relief,pressure and Temper, manufactured by Pre-Mach Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-315-9101 has 6 manufacturer part numbers on file: 16-40974-1 (Pre-Mach Inc), 16-40974-1 (York Precision Machining and Hydraulics, Llc), 16-40974-1 (Krobach Mfg. Corp. Dba Krobach Manufacturing Corp), 16-40974-1 (Master Research & Manufacturing, Inc. Dba Master Research & Manufacturing Inc), 16-40974-1 (Duhadaway Tool & Die Shop Inc) and 1 more.
Key specifications for 16-40974-1: Second End Relationship with First End: NOT IDENTICAL; Face to Face Distance: 3.500 INCHES NOMINAL IN; Special Test Features: MATERIAL:PHOSPHORUS BRONZE ASTM-B139,ALLOY C52400,H04,ALTERNATE: ALUMINUM BRONZE ASTM-B-148, ALLOY C95500 AS CAST; First End Recess Depth: 0.563 INCHES NOMINAL IN. 11 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.
NSN 4820-00-315-9101 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.