PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4994907Seat,valve

Kalmar AC Inc · NSN 4820-00-891-5998 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-00-891-5998 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-891-5998. Primary manufacturer part number: 4994907.
Features
  • Seat,valve — FSC 4820
  • Style Designator: PLAIN THREADED
  • Nominal Thread Size: 0.375 INCHES SINGLE THREADED PORTION IN
  • Body Inside Diameter: 0.125 INCHES NOMINAL IN
  • Seating Surface Shape: FLAT
  • Thread Class: 2A SINGLE THREADED PORTION A
  • Material: STEEL OVERALL
  • Thread Length: 0.156 INCHES NOMINAL SINGLE THREADED PORTION IN
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Steel Overall construction
General Description

The Seat,valve, cataloged under National Stock Number 4820-00-891-5998, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Kalmar AC Inc. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-00-891-5998
Primary Part Number4994907
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerKalmar AC Inc
StatusACTIVE
Style DesignatorPLAIN THREADED
Nominal Thread Size0.375 INCHES SINGLE THREADED PORTION IN
Body Inside Diameter0.125 INCHES NOMINAL IN
Seating Surface ShapeFLAT
Thread Class2A SINGLE THREADED PORTION A
MaterialSTEEL OVERALL
Thread Length0.156 INCHES NOMINAL SINGLE THREADED PORTION IN
Thread Series DesignatorUNF SINGLE THREADED PORTION
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 10
3030-00-197-7913BX59 INTERCHANGEABLE
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5360-00-291-6161859 INTERCHANGEABLE
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6145-00-542-6809 INTERCHANGEABLE
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5940-00-779-225755A TERMINAL BOARD INTERCHANGEABLE
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5910-00-813-2436859-500N INTERCHANGEABLE
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5133-00-865-422688812 INTERCHANGEABLE
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9390-01-064-1677859 INTERCHANGEABLE
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2990-01-075-343842995 INTERCHANGEABLE
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6625-01-105-2897859 INTERCHANGEABLE
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Cross-Reference Index
Part NumberManufacturer
4994907 PRIMARY Kalmar AC Inc (USA)
859 PRIMARY Eaton Corporation Div Eaton Fluid Power (USA)
Related Parts
3030-00-197-7913INTERCHANGEABLE
BELT,V
BX59
5360-00-291-6161INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
859
6145-00-542-6809INTERCHANGEABLE
BRAID,WIRE
5940-00-779-2257INTERCHANGEABLE
TERMINAL BOARD
55A TERMINAL BOARD
5910-00-813-2436INTERCHANGEABLE
CAPACITOR,FIXED,CERAMIC DIELECTR
859-500N
5133-00-865-4226INTERCHANGEABLE
BIT,SPADE,WOOD BORING
88812
9390-01-064-1677INTERCHANGEABLE
NONMETALLIC CHANNEL
859
2990-01-075-3438INTERCHANGEABLE
BREATHER FILTER,EMISSION CONTROL
42995
6625-01-105-2897INTERCHANGEABLE
GENERATOR,PULSE
859
5310-01-399-7334INTERCHANGEABLE
NUT,PLAIN,HEXAGON
17305

Frequently Asked Questions

What is NSN 4820-00-891-5998?

NSN 4820-00-891-5998 is a Seat,valve, manufactured by Kalmar AC Inc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-00-891-5998?

NSN 4820-00-891-5998 has 2 cross-referenced part numbers: 4994907 (Kalmar AC Inc), 859 (Eaton Corporation Div Eaton Fluid Power).

What NSN replaces 4820-00-891-5998?

There are 10 known substitutes for 4820-00-891-5998: 3030-00-197-7913, 5360-00-291-6161, 6145-00-542-6809 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 4994907?

Key specifications for 4994907: Style Designator: PLAIN THREADED; Nominal Thread Size: 0.375 INCHES SINGLE THREADED PORTION IN; Body Inside Diameter: 0.125 INCHES NOMINAL IN; Seating Surface Shape: FLAT. 9 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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