PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

7603Ring,piston

Kaydon Ring & Seal Inc Dba Skf Precision Technologies · NSN 4310-00-446-3388 · FSC 4310 · No Item Name Available
Verified by PartsTable
NSN 4310-00-446-3388 — this item is cataloged by the U.S. Government under National Stock Number 4310-00-446-3388. Primary manufacturer part number: 7603.
Features
  • Ring,piston — FSC 4310
  • FSC Application Data: PISTON,PUMP,PRESSUREREGULATING VALVE
  • Ring Style: CONCENTRIC
  • Material: IRON OVERALL
  • Cross-Sectional Shape Style: PLAIN RECTANGULAR, STRAIGHT FACE
  • Standard Bore Diameter: 4.250 INCHES IN
  • Joint Style: VERTICAL JOINT
  • Radial Wall Thickness: 0.1360 INCHES MINIMUM AND 0.1520 INCHES MAXIMUM IN
Applications
  • Applications requiring Iron Overall construction
General Description

The Ring,piston, cataloged under National Stock Number 4310-00-446-3388, is classified within Federal Supply Class 4310 (No Item Name Available) of the Pumps and Compressors group. The primary manufacturer of record is Kaydon Ring & Seal Inc Dba Skf Precision Technologies. Government technical data includes 7 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 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: Cancelled.

Technical Specifications
ParameterValue
NSN4310-00-446-3388
Primary Part Number7603
Item NameRing,piston
FSC / FSG4310 / 43 — No Item Name Available
ManufacturerKaydon Ring & Seal Inc Dba Skf Precision Technologies
StatusCANCELLED
FSC Application DataPISTON,PUMP,PRESSUREREGULATING VALVE
Ring StyleCONCENTRIC
MaterialIRON OVERALL
Cross-Sectional Shape StylePLAIN RECTANGULAR, STRAIGHT FACE
Standard Bore Diameter4.250 INCHES IN
Joint StyleVERTICAL JOINT
Radial Wall Thickness0.1360 INCHES MINIMUM AND 0.1520 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
5935-00-258-9896205-102 INTERCHANGEABLE
Jack,tip
Halsit Holdings Llc Div Halsit Holdings, Llc Dba Abbatron
6625-00-261-51277603 INTERCHANGEABLE
Oscilloscope Mainframe
Tektronix, Inc.
5360-00-263-45657603 INTERCHANGEABLE
Spring,helical,compression
Te Connectivity Corporation
4730-00-288-9420155F-8 INTERCHANGEABLE
Elbow,tube
Parker-Hannifin Corp Div Fluid System Connector Division
2825-00-388-69227603 INTERCHANGEABLE
Retainer,spring
Northrop Grumman Systems Corporation Div Marine Systems
5905-00-432-7650 INTERCHANGEABLE
Resistor,variable,wire Wound,pre
5360-00-526-16507603 INTERCHANGEABLE
Spring,helical,extension
Telemechanics Inc
5310-00-550-1469 INTERCHANGEABLE
Nut,plain,hexagon
3110-00-554-3355 INTERCHANGEABLE
Bearing,ball,annular
5330-00-559-2708 INTERCHANGEABLE
Seal,plain Encased
Cross-Reference Index
Part NumberManufacturer
7603 PRIMARY Kaydon Ring & Seal Inc Dba Skf Precision Technologies (USA)
N03365 Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
03365 Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
3365 Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
Related Parts
5935-00-258-9896INTERCHANGEABLE
JACK,TIP
205-102
6625-00-261-5127INTERCHANGEABLE
OSCILLOSCOPE MAINFRAME
7603
5360-00-263-4565INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
7603
4730-00-288-9420INTERCHANGEABLE
ELBOW,TUBE
155F-8
2825-00-388-6922INTERCHANGEABLE
RETAINER,SPRING
7603
5905-00-432-7650INTERCHANGEABLE
RESISTOR,VARIABLE,WIRE WOUND,PRE
5360-00-526-1650INTERCHANGEABLE
SPRING,HELICAL,EXTENSION
7603
5310-00-550-1469INTERCHANGEABLE
NUT,PLAIN,HEXAGON
3110-00-554-3355INTERCHANGEABLE
BEARING,BALL,ANNULAR
5330-00-559-2708INTERCHANGEABLE
SEAL,PLAIN ENCASED
5950-00-645-1142INTERCHANGEABLE
REACTOR
697431PC2
5945-00-835-9065INTERCHANGEABLE
FLASHER,THERMAL
77000071-000

Frequently Asked Questions

What is NSN 4310-00-446-3388?

NSN 4310-00-446-3388 is a Ring,piston, manufactured by Kaydon Ring & Seal Inc Dba Skf Precision Technologies, classified under FSC 4310 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 4310-00-446-3388?

NSN 4310-00-446-3388 has 4 cross-referenced part numbers: 7603 (Kaydon Ring & Seal Inc Dba Skf Precision Technologies), N03365 (Leslie Controls, Inc. Dba Leslie Controls Inc), 03365 (Leslie Controls, Inc. Dba Leslie Controls Inc), 3365 (Leslie Controls, Inc. Dba Leslie Controls Inc).

What NSN replaces 4310-00-446-3388?

There are 12 known substitutes for 4310-00-446-3388: 5935-00-258-9896, 6625-00-261-5127, 5360-00-263-4565 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 7603?

Key specifications for 7603: FSC Application Data: PISTON,PUMP,PRESSUREREGULATING VALVE; Ring Style: CONCENTRIC; Material: IRON OVERALL; Overall Width: 0.1540 INCHES NOMINAL IN. 8 total characteristics are documented in the Federal Logistics Information System.

Is NSN 4310-00-446-3388 still in active supply?

NSN 4310-00-446-3388 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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