PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

338863R91Valve,safety Relief

Komatsu America Corp. · NSN 4820-00-847-5941 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-00-847-5941 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-847-5941. Primary manufacturer part number: 338863R91.
Features
  • Valve,safety Relief — FSC 4820
  • Flow Control Device: BALL
  • Nominal Thread Size: 0.625 INCHES FIRST END IN
  • Connection Style: SWIVEL NUT, INVERTED FLARE(TUBE) FIRST END
  • Valve Operation Method: AUTOMATIC
  • Seat Angle: 37.0 DEGREES FIRST END
  • Thread Class: 2B FIRST END
  • Connection Type: THREADED EXTERNAL PIPE SECOND END
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Steel Overall construction
General Description

The Valve,safety Relief, cataloged under National Stock Number 4820-00-847-5941, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Komatsu America Corp.. Government technical data includes 17 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-00-847-5941
Primary Part Number338863R91
Item NameValve,safety Relief
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerKomatsu America Corp.
StatusACTIVE
Flow Control DeviceBALL
Nominal Thread Size0.625 INCHES FIRST END IN
Connection StyleSWIVEL NUT, INVERTED FLARE(TUBE) FIRST END
Valve Operation MethodAUTOMATIC
Seat Angle37.0 DEGREES FIRST END
Thread Class2B FIRST END
Connection TypeTHREADED EXTERNAL PIPE SECOND END
Nominal Thread Size0.375 INCHES SECOND END IN
Connection TypeTHREADED INTERNAL TUBE FIRST END
Connection StylePLAIN (PIPE) SECOND END
Thread Series DesignatorNPT SECOND END
Thread Series DesignatorUNF FIRST END
Thread DirectionRIGHT-HAND SECOND END
Style DesignatorANGLE
Nominal Outside Diameter Tube Accommodated0.375 INCHES FIRST END IN
Thread DirectionRIGHT-HAND FIRST END
MaterialSTEEL OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
2940-00-382-8003L21 INTERCHANGEABLE
Line
Honeywell International Inc Dba Honeywell Div Consumer Products Group
2805-00-383-8660 INTERCHANGEABLE
Flange,manifold
4310-00-868-09161E-69869-12 INTERCHANGEABLE
Ring,piston
Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp
Cross-Reference Index
Part NumberManufacturer
338863R91 Komatsu America Corp. (USA)
338863R91 Navistar Intl Corp Melrose Park Engine Plant Location /melrose Park/ (USA)
338863R91 Komatsu American Intl Co (USA)
A3249 Anchor Swan Corp (USA)
Related Parts
2940-00-382-8003INTERCHANGEABLE
LINE
L21
2805-00-383-8660INTERCHANGEABLE
FLANGE,MANIFOLD
4310-00-868-0916INTERCHANGEABLE
RING,PISTON
1E-69869-12

Frequently Asked Questions

What is NSN 4820-00-847-5941?

NSN 4820-00-847-5941 is a Valve,safety Relief, manufactured by Komatsu America Corp., classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-00-847-5941?

NSN 4820-00-847-5941 has 4 cross-referenced part numbers: 338863R91 (Komatsu America Corp.), 338863R91 (Navistar Intl Corp Melrose Park Engine Plant Location /melrose Park/), 338863R91 (Komatsu American Intl Co), A3249 (Anchor Swan Corp).

What NSN replaces 4820-00-847-5941?

There are 3 known substitutes for 4820-00-847-5941: 2940-00-382-8003, 2805-00-383-8660, 4310-00-868-0916. Verify interchangeability with system specifications before substitution.

What are the specifications of 338863R91?

Key specifications for 338863R91: Flow Control Device: BALL; Nominal Thread Size: 0.625 INCHES FIRST END IN; Connection Style: SWIVEL NUT, INVERTED FLARE(TUBE) FIRST END; Valve Operation Method: AUTOMATIC. 17 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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