PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

45121Ring,piston

Leroi International Inc Dba Compair Leroi · NSN 4310-00-397-3126 · FSC 4310 · No Item Name Available
Verified by PartsTable
NSN 4310-00-397-3126 — this item is cataloged by the U.S. Government under National Stock Number 4310-00-397-3126. Primary manufacturer part number: 45121.
Features
  • Ring,piston — FSC 4310
  • Radial Wall Thickness: 0.1120 INCHES NOMINAL IN
  • Cross-Sectional Shape Style: MULTI-PIECE STRAIGHT FACE, VENTILATED OIL CONTROL SPACER
  • Material: STEEL OVERALL
  • Ring Style: CONCENTRIC
  • Joint Style: VERTICAL JOINT
  • Standard Bore Diameter: 2.250 INCHES IN
  • 2 verified cross-references
Applications
  • Applications requiring Steel Overall construction
General Description

The Ring,piston, cataloged under National Stock Number 4310-00-397-3126, is classified within Federal Supply Class 4310 (No Item Name Available) of the Pumps and Compressors group. The primary manufacturer of record is Leroi International Inc Dba Compair Leroi. Government technical data includes 6 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. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4310-00-397-3126
Primary Part Number45121
Item NameRing,piston
FSC / FSG4310 / 43 — No Item Name Available
ManufacturerLeroi International Inc Dba Compair Leroi
StatusACTIVE
Radial Wall Thickness0.1120 INCHES NOMINAL IN
Cross-Sectional Shape StyleMULTI-PIECE STRAIGHT FACE, VENTILATED OIL CONTROL SPACER
MaterialSTEEL OVERALL
Ring StyleCONCENTRIC
Joint StyleVERTICAL JOINT
Standard Bore Diameter2.250 INCHES IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5365-00-050-7939 INTERCHANGEABLE
Plug,machine Thread
3455-00-455-9096B-12 INTERCHANGEABLE
Cutter,milling,end
Pohl Tool Co
5955-00-795-462245121 INTERCHANGEABLE
Oscillating Group
L3harris Technologies, Inc. Div Space and Airborne Systems
5110-01-011-3881 INTERCHANGEABLE
Stripper,wire,hand
2510-01-096-949645121 INTERCHANGEABLE
Spring Assembly,leaf
Hme, Inc. Dba Hme Ahrens-Fox
5365-01-238-0422 INTERCHANGEABLE
Ring,special
5930-01-322-451345121 INTERCHANGEABLE
Switch,flow
Setra Systems, Inc. Dba Gems Sensors
5930-01-354-9794 INTERCHANGEABLE
Switch,toggle
3455-01-365-1664307-13 INTERCHANGEABLE
Cutter,milling,side
Kennametal Inc. Div Kennametal Industrial Products Group
5340-01-432-400745121 INTERCHANGEABLE
Strap,retaining
Tyco Fire Products Lp
Cross-Reference Index
Part NumberManufacturer
45121 PRIMARY Leroi International Inc Dba Compair Leroi (USA)
45121 Compair Kellogg Div of Robertshaw Controls Co (USA)
Related Parts
5365-00-050-7939INTERCHANGEABLE
PLUG,MACHINE THREAD
3455-00-455-9096INTERCHANGEABLE
CUTTER,MILLING,END
B-12
5955-00-795-4622INTERCHANGEABLE
OSCILLATING GROUP
45121
5110-01-011-3881INTERCHANGEABLE
STRIPPER,WIRE,HAND
2510-01-096-9496INTERCHANGEABLE
SPRING ASSEMBLY,LEAF
45121
5365-01-238-0422INTERCHANGEABLE
RING,SPECIAL
5930-01-322-4513INTERCHANGEABLE
SWITCH,FLOW
45121
5930-01-354-9794INTERCHANGEABLE
SWITCH,TOGGLE
3455-01-365-1664INTERCHANGEABLE
CUTTER,MILLING,SIDE
307-13
5340-01-432-4007INTERCHANGEABLE
STRAP,RETAINING
45121
5305-01-591-5777INTERCHANGEABLE
SCREW,CAP,SOCKET HEAD
45121
7025-01-642-1899INTERCHANGEABLE
INTERFACE UNIT,AUTOMATIC DATA PR
45121

Frequently Asked Questions

What is NSN 4310-00-397-3126?

NSN 4310-00-397-3126 is a Ring,piston, manufactured by Leroi International Inc Dba Compair Leroi, classified under FSC 4310 (No Item Name Available). Status: active.

What are the part numbers for NSN 4310-00-397-3126?

NSN 4310-00-397-3126 has 2 cross-referenced part numbers: 45121 (Leroi International Inc Dba Compair Leroi), 45121 (Compair Kellogg Div of Robertshaw Controls Co).

What NSN replaces 4310-00-397-3126?

There are 12 known substitutes for 4310-00-397-3126: 5365-00-050-7939, 3455-00-455-9096, 5955-00-795-4622 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 45121?

Key specifications for 45121: Radial Wall Thickness: 0.1120 INCHES NOMINAL IN; Cross-Sectional Shape Style: MULTI-PIECE STRAIGHT FACE, VENTILATED OIL CONTROL SPACER; Material: STEEL OVERALL; Overall Width: 0.1560 INCHES NOMINAL IN. 7 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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