PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20381Ring,retaining

Carter-Day Industries Inc Hart-Carter Co Div · NSN 5325-00-281-6506 · FSC 5325 · No Item Name Available
Verified by PartsTable
NSN 5325-00-281-6506 — this item is cataloged by the U.S. Government under National Stock Number 5325-00-281-6506. Primary manufacturer part number: 20381.
Features
  • Ring,retaining — FSC 5325
  • Casehardening Indicator: NOT CASEHARDENED
  • Material: STEEL
  • Surface Treatment: PHOSPHATE
  • Outside Diameter: 0.634 INCHES MINIMUM AND 0.666 INCHES MAXIMUM IN
  • Cross-Sectional Shape Style: ROUND
  • Inside Diameter: 0.532 INCHES MINIMUM AND 0.563 INCHES MAXIMUM IN
  • Material Diameter: 0.054 INCHES NOMINAL IN
Applications
  • Applications requiring Steel construction
General Description

The Ring,retaining, cataloged under National Stock Number 5325-00-281-6506, is classified within Federal Supply Class 5325 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Carter-Day Industries Inc Hart-Carter Co Div. Government technical data includes 9 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
NSN5325-00-281-6506
Primary Part Number20381
Item NameRing,retaining
FSC / FSG5325 / 53 — No Item Name Available
ManufacturerCarter-Day Industries Inc Hart-Carter Co Div
StatusACTIVE
Casehardening IndicatorNOT CASEHARDENED
MaterialSTEEL
Surface TreatmentPHOSPHATE
Outside Diameter0.634 INCHES MINIMUM AND 0.666 INCHES MAXIMUM IN
Cross-Sectional Shape StyleROUND
Inside Diameter0.532 INCHES MINIMUM AND 0.563 INCHES MAXIMUM IN
Material Diameter0.054 INCHES NOMINAL IN
Ring StyleHOOKED
Usage DesignINTERNAL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
3820-00-406-663420381 INTERCHANGEABLE
Safety Chain and Support
Eagle Crusher Co Inc Dba Stedman Machine Co
5330-00-505-6186AWR4 INTERCHANGEABLE
Seal,special
Dixon Valve & Coupling Company, Llc Div Dixon Fire
2530-00-737-10107371010 INTERCHANGEABLE
Brake Drum
U S Army Tank Automotive Command Amsta-Im-Mm
5340-00-911-245420381 INTERCHANGEABLE
Hinge,access Door
Silver King Refrigeration Inc.
6625-00-976-128331-2038-1 INTERCHANGEABLE
Adapter,test
Amphenol Corporation Div Amphenol Rf
5342-01-194-8728 INTERCHANGEABLE
Hinge
4320-01-210-9629206-735 INTERCHANGEABLE
Parts Kit,rotary Pump
Graco Inc.
4470-01-211-2566 INTERCHANGEABLE
Housing,special
3020-01-221-147320381 INTERCHANGEABLE
Gear,internal
Dana Commercial Vehicle Products, Llc
1680-01-345-76492038-1 INTERCHANGEABLE
Filter,aircraft Instruments
B/e Aerospace, Inc.
Cross-Reference Index
Part NumberManufacturer
20381 Carter-Day Industries Inc Hart-Carter Co Div (USA)
20381 Lauson Division of Tecumseh Products Co (USA)
Related Parts
3820-00-406-6634INTERCHANGEABLE
SAFETY CHAIN AND SUPPORT
20381
5330-00-505-6186INTERCHANGEABLE
SEAL,SPECIAL
AWR4
2530-00-737-1010INTERCHANGEABLE
BRAKE DRUM
7371010
5340-00-911-2454INTERCHANGEABLE
HINGE,ACCESS DOOR
20381
6625-00-976-1283INTERCHANGEABLE
ADAPTER,TEST
31-2038-1
5342-01-194-8728INTERCHANGEABLE
HINGE
4320-01-210-9629INTERCHANGEABLE
PARTS KIT,ROTARY PUMP
206-735
4470-01-211-2566INTERCHANGEABLE
HOUSING,SPECIAL
3020-01-221-1473INTERCHANGEABLE
GEAR,INTERNAL
20381
1680-01-345-7649INTERCHANGEABLE
FILTER,AIRCRAFT INSTRUMENTS
2038-1
6640-01-421-5514INTERCHANGEABLE
PANEL,CONTROL,CLEAN
20381
4820-01-442-8259INTERCHANGEABLE
VALVE,SAFETY RELIEF
2038101E0005

Frequently Asked Questions

What is NSN 5325-00-281-6506?

NSN 5325-00-281-6506 is a Ring,retaining, manufactured by Carter-Day Industries Inc Hart-Carter Co Div, classified under FSC 5325 (No Item Name Available). Status: active.

What are the part numbers for NSN 5325-00-281-6506?

NSN 5325-00-281-6506 has 2 cross-referenced part numbers: 20381 (Carter-Day Industries Inc Hart-Carter Co Div), 20381 (Lauson Division of Tecumseh Products Co).

What NSN replaces 5325-00-281-6506?

There are 12 known substitutes for 5325-00-281-6506: 3820-00-406-6634, 5330-00-505-6186, 2530-00-737-1010 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 20381?

Key specifications for 20381: Casehardening Indicator: NOT CASEHARDENED; Material: STEEL; Surface Treatment: PHOSPHATE; Outside Diameter: 0.634 INCHES MINIMUM AND 0.666 INCHES MAXIMUM IN. 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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