PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

R-8-9-20Ring,operating

Todd Combustion Inc · NSN 5365-01-090-6579 · FSC 5365 · No Item Name Available
Verified by PartsTable
NSN 5365-01-090-6579 — this item is cataloged by the U.S. Government under National Stock Number 5365-01-090-6579. Primary manufacturer part number: R-8-9-20.
Features
  • Ring,operating — FSC 5365
  • General Characteristics Item Description: CAST STEEL; 25.437 IN. OD; 20.500 IN. ID; 1.250 IN. THK; W/10 HOLES 0.500-13 UNC THD,EQUALLY SPACED ON 23.468 IN. DIA BOLT CIRCLE; ALSO HAS A INTERNAL GEAR SEGMENT IN
  • 3 verified cross-references
  • Primary manufacturer: Todd Combustion Inc
Applications
  • General assembly and fastening
  • Structural repair and reinforcement
  • Facility maintenance hardware
General Description

The Ring,operating, cataloged under National Stock Number 5365-01-090-6579, is classified within Federal Supply Class 5365 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Todd Combustion Inc. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5365-01-090-6579
Primary Part NumberR-8-9-20
Item NameRing,operating
FSC / FSG5365 / 53 — No Item Name Available
ManufacturerTodd Combustion Inc
StatusACTIVE
General Characteristics Item DescriptionCAST STEEL; 25.437 IN. OD; 20.500 IN. ID; 1.250 IN. THK; W/10 HOLES 0.500-13 UNC THD,EQUALLY SPACED ON 23.468 IN. DIA BOLT CIRCLE; ALSO HAS A INTERNAL GEAR SEGMENT IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
5930-00-135-504037346 INTERCHANGEABLE
Switch,thermostatic
Northrop Grumman Systems Corp Dba Northrop Grumman Systems Corp
9540-00-242-5436 INTERCHANGEABLE
Beam,structural
4810-00-336-950937346 INTERCHANGEABLE
Seat,valve
Eaton Aerospace, Llc Dba Jackson South
9540-00-528-8819 INTERCHANGEABLE
Beam,structural
5950-00-945-377037346 INTERCHANGEABLE
Transformer,audio Frequency
Freed Transformer Co
6210-01-158-0393 INTERCHANGEABLE
Light Assembly,indicator
5365-01-418-5879CB27986-001 INTERCHANGEABLE
Shim
Moog Inc. Dba Ampac-Isp Corp
6685-01-577-8061R8920 INTERCHANGEABLE
Sensor,ambient Temperature
Isspro, Inc. Dba Isspro Inc
5310-01-683-296037346 INTERCHANGEABLE
Nut,self-Locking,extended Washer
Fastenal Company Div Mqmi
Cross-Reference Index
Part NumberManufacturer
R-8-9-20 PRIMARY Todd Combustion Inc (USA)
37346 Todd Combustion Inc (USA)
N-47501 SHT-1 PC15 Todd Combustion Inc (USA)
Related Parts
5930-00-135-5040INTERCHANGEABLE
SWITCH,THERMOSTATIC
37346
9540-00-242-5436INTERCHANGEABLE
BEAM,STRUCTURAL
4810-00-336-9509INTERCHANGEABLE
SEAT,VALVE
37346
9540-00-528-8819INTERCHANGEABLE
BEAM,STRUCTURAL
5950-00-945-3770INTERCHANGEABLE
TRANSFORMER,AUDIO FREQUENCY
37346
6210-01-158-0393INTERCHANGEABLE
LIGHT ASSEMBLY,INDICATOR
5365-01-418-5879INTERCHANGEABLE
SHIM
CB27986-001
6685-01-577-8061INTERCHANGEABLE
SENSOR,AMBIENT TEMPERATURE
R8920
5310-01-683-2960INTERCHANGEABLE
NUT,SELF-LOCKING,EXTENDED WASHER
37346

Frequently Asked Questions

What is NSN 5365-01-090-6579?

NSN 5365-01-090-6579 is a Ring,operating, manufactured by Todd Combustion Inc, classified under FSC 5365 (No Item Name Available). Status: active.

What are the part numbers for NSN 5365-01-090-6579?

NSN 5365-01-090-6579 has 3 cross-referenced part numbers: R-8-9-20 (Todd Combustion Inc), 37346 (Todd Combustion Inc), N-47501 SHT-1 PC15 (Todd Combustion Inc).

What NSN replaces 5365-01-090-6579?

There are 9 known substitutes for 5365-01-090-6579: 5930-00-135-5040, 9540-00-242-5436, 4810-00-336-9509 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of R-8-9-20?

Key specifications for R-8-9-20: General Characteristics Item Description: CAST STEEL; 25.437 IN. OD; 20.500 IN. ID; 1.250 IN. THK; W/10 HOLES 0.500-13 UNC THD,EQUALLY SPACED ON 23.468 IN. DIA BOLT CIRCLE; ALSO HAS A INTERNAL GEAR SEGMENT IN. 1 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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