PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

26M77-100 ITEM90Ring,wearing

Electric Boat Corporation Div General Dynamics Electric Boat · NSN 4320-01-148-8305 · FSC 4320 · No Item Name Available
Verified by PartsTable
NSN 4320-01-148-8305 — this item is cataloged by the U.S. Government under National Stock Number 4320-01-148-8305. Primary manufacturer part number: 26M77-100 ITEM90.
Features
  • Ring,wearing — FSC 4320
  • Material: COPPER ALLOY
  • Internal Flange Inside Diameter: 2.460 INCHES NOMINAL IN
  • Body Outside Diameter: 2.937 INCHES NOMINAL IN
  • Corner Shape: SQUARE ALL CORNERS
  • Body Style: PLAIN W/INTERNAL FLANGE
  • Internal Flange Width: 0.250 INCHES NOMINAL IN
  • 4 verified cross-references
Applications
  • Applications requiring Copper Alloy construction
General Description

The Ring,wearing, cataloged under National Stock Number 4320-01-148-8305, is classified within Federal Supply Class 4320 (No Item Name Available) of the Pumps and Compressors group. The primary manufacturer of record is Electric Boat Corporation Div General Dynamics Electric Boat. Government technical data includes 6 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: Active.

Technical Specifications
ParameterValue
NSN4320-01-148-8305
Primary Part Number26M77-100 ITEM90
Item NameRing,wearing
FSC / FSG4320 / 43 — No Item Name Available
ManufacturerElectric Boat Corporation Div General Dynamics Electric Boat
StatusACTIVE
MaterialCOPPER ALLOY
Internal Flange Inside Diameter2.460 INCHES NOMINAL IN
Body Outside Diameter2.937 INCHES NOMINAL IN
Corner ShapeSQUARE ALL CORNERS
Body StylePLAIN W/INTERNAL FLANGE
Internal Flange Width0.250 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
4820-00-900-234426M77-100 ITEM 19 INTERCHANGEABLE
Disk,valve
Naval Ship Systems Command
4820-01-092-034326M77-100 ITEM 21 INTERCHANGEABLE
Retainer,disk,valve
Naval Ship Systems Command
4820-01-121-29032620-920X12 PIECE 53 3IN INTERCHANGEABLE
Adapter,splined,globe Valve
Hydro-Aire Aerospace Corp
4820-01-151-380826M77-100 ITEM 94 INTERCHANGEABLE
Guide,valve Stem
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-159-777726M77-100 ITEM 31 INTERCHANGEABLE
Disk Retainer and Throttling Ski
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-160-160426M77-100 ITEM 93 INTERCHANGEABLE
Guide,valve Stem
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-161-093226M77-100 PIECE 18 INTERCHANGEABLE
Seat,valve
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-161-519026M77-100 PIECE 20 INTERCHANGEABLE
Disk,valve
Electric Boat Corporation Div General Dynamics Electric Boat
3020-01-190-616326M77-100 PIECE 55 4IN INTERCHANGEABLE
Gear,bevel
Electric Boat Corporation Div General Dynamics Electric Boat
5340-01-199-808326M77-100 ITEM 70 INTERCHANGEABLE
Plunger,detent
Electric Boat Corporation Div General Dynamics Electric Boat
Cross-Reference Index
Part NumberManufacturer
26M77-100 Electric Boat Corporation Div General Dynamics Electric Boat (USA)
845-2445066 ITEM 90 Naval Ship Systems Command (USA)
845-2445066 Naval Ship Systems Command (USA)
26M77-100 ITEM90 PRIMARY Electric Boat Corporation Div General Dynamics Electric Boat (USA)
Related Parts
4820-00-900-2344INTERCHANGEABLE
DISK,VALVE
26M77-100 ITEM 19
4820-01-092-0343INTERCHANGEABLE
RETAINER,DISK,VALVE
26M77-100 ITEM 21
4820-01-121-2903INTERCHANGEABLE
ADAPTER,SPLINED,GLOBE VALVE
2620-920X12 PIECE 53 3IN
4820-01-151-3808INTERCHANGEABLE
GUIDE,VALVE STEM
26M77-100 ITEM 94
4820-01-159-7777INTERCHANGEABLE
DISK RETAINER AND THROTTLING SKI
26M77-100 ITEM 31
4820-01-160-1604INTERCHANGEABLE
GUIDE,VALVE STEM
26M77-100 ITEM 93
4820-01-161-0932INTERCHANGEABLE
SEAT,VALVE
26M77-100 PIECE 18
4820-01-161-5190INTERCHANGEABLE
DISK,VALVE
26M77-100 PIECE 20
3020-01-190-6163INTERCHANGEABLE
GEAR,BEVEL
26M77-100 PIECE 55 4IN
5340-01-199-8083INTERCHANGEABLE
PLUNGER,DETENT
26M77-100 ITEM 70
3020-01-212-0328INTERCHANGEABLE
GEAR SET,BEVEL,MATCHED
845-2445066 ITEM 55,66
4820-01-216-9271INTERCHANGEABLE
DISK STEM RING,VALV
26N77-100 ITEM 28

Frequently Asked Questions

What is NSN 4320-01-148-8305?

NSN 4320-01-148-8305 is a Ring,wearing, manufactured by Electric Boat Corporation Div General Dynamics Electric Boat, classified under FSC 4320 (No Item Name Available). Status: active.

What are the part numbers for NSN 4320-01-148-8305?

NSN 4320-01-148-8305 has 4 cross-referenced part numbers: 26M77-100 (Electric Boat Corporation Div General Dynamics Electric Boat), 845-2445066 ITEM 90 (Naval Ship Systems Command), 845-2445066 (Naval Ship Systems Command), 26M77-100 ITEM90 (Electric Boat Corporation Div General Dynamics Electric Boat).

What NSN replaces 4320-01-148-8305?

There are 12 known substitutes for 4320-01-148-8305: 4820-00-900-2344, 4820-01-092-0343, 4820-01-121-2903 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 26M77-100 ITEM90?

Key specifications for 26M77-100 ITEM90: Material: COPPER ALLOY; Overall Length: 1.380 INCHES NOMINAL IN; Internal Flange Inside Diameter: 2.460 INCHES NOMINAL IN; Body Outside Diameter: 2.937 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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