PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

841-02Seat,valve

Trac Regulator Co., Inc. Dba Trac Regulator Co Inc · NSN 4820-01-221-8874 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-221-8874 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-221-8874. Primary manufacturer part number: 841-02.
Features
  • Seat,valve — FSC 4820
  • Seating Surface Shape: FLAT
  • Material: NICKEL ALLOY OVERALL
  • 6 verified cross-references
  • Primary manufacturer: Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Nickel Alloy Overall construction
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-221-8874, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Trac Regulator Co., Inc. Dba Trac Regulator Co Inc. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN4820-01-221-8874
Primary Part Number841-02
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerTrac Regulator Co., Inc. Dba Trac Regulator Co Inc
StatusCANCELLED
Seating Surface ShapeFLAT
MaterialNICKEL ALLOY OVERALL
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
6625-00-557-0872 INTERCHANGEABLE
Indicator,phase Sequence
5310-01-098-7827841-00 INTERCHANGEABLE
Nut,self-Locking,hexagon
Hutchens Industries Inc
1650-01-104-61884100020-1 INTERCHANGEABLE
Motor,hydraulic
Honeywell International Inc Div Aerospace-South Bend (bendix Dr)
5342-01-167-218784100 INTERCHANGEABLE
Bracket
Whirlpool Corp Dba Whirlpool Corp
5945-01-167-8045404061 INTERCHANGEABLE
Relay,reed
Fluke Corp
5962-01-240-5628 INTERCHANGEABLE
Microcircuit,digital
5962-01-274-5253 INTERCHANGEABLE
Microcircuit,digital
5935-01-297-8529404061 INTERCHANGEABLE
Connector,plug,electrical
Barber-Nichols, Llc
4810-01-399-425884497 INTERCHANGEABLE
Guide,valve Stem
Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator
4820-01-414-6824843-01 INTERCHANGEABLE
Retainer,disk,valve
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
Cross-Reference Index
Part NumberManufacturer
40449-1 FIND 25 Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
841-02 PRIMARY Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
40406-1 PC 25 Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
40406-1 Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
40449-1 Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
841-00 PRIMARY Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA)
Related Parts
6625-00-557-0872INTERCHANGEABLE
INDICATOR,PHASE SEQUENCE
5310-01-098-7827INTERCHANGEABLE
NUT,SELF-LOCKING,HEXAGON
841-00
1650-01-104-6188INTERCHANGEABLE
MOTOR,HYDRAULIC
4100020-1
5342-01-167-2187INTERCHANGEABLE
BRACKET
84100
5945-01-167-8045INTERCHANGEABLE
RELAY,REED
404061
5962-01-240-5628INTERCHANGEABLE
MICROCIRCUIT,DIGITAL
5962-01-274-5253INTERCHANGEABLE
MICROCIRCUIT,DIGITAL
5935-01-297-8529INTERCHANGEABLE
CONNECTOR,PLUG,ELECTRICAL
404061
4810-01-399-4258INTERCHANGEABLE
GUIDE,VALVE STEM
84497
4820-01-414-6824INTERCHANGEABLE
RETAINER,DISK,VALVE
843-01
4820-01-414-8105INTERCHANGEABLE
BODY,VALVE
839-01
4820-01-414-8109INTERCHANGEABLE
DISK,VALVE
842-01

Frequently Asked Questions

What is NSN 4820-01-221-8874?

NSN 4820-01-221-8874 is a Seat,valve, manufactured by Trac Regulator Co., Inc. Dba Trac Regulator Co Inc, classified under FSC 4820 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 4820-01-221-8874?

NSN 4820-01-221-8874 has 6 cross-referenced part numbers: 40449-1 FIND 25 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), 841-02 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), 40406-1 PC 25 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), 40406-1 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), 40449-1 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc) and 1 more.

What NSN replaces 4820-01-221-8874?

There are 12 known substitutes for 4820-01-221-8874: 6625-00-557-0872, 5310-01-098-7827, 1650-01-104-6188 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 841-02?

Key specifications for 841-02: Seating Surface Shape: FLAT; Material: NICKEL ALLOY OVERALL. 2 total characteristics are documented in the Federal Logistics Information System.

Is NSN 4820-01-221-8874 still in active supply?

NSN 4820-01-221-8874 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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