PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

257Plug,expansion

Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp. · NSN 5340-00-598-5078 · FSC 5340 · No Item Name Available
Verified by PartsTable
NSN 5340-00-598-5078 — this item is cataloged by the U.S. Government under National Stock Number 5340-00-598-5078. Primary manufacturer part number: 257.
Features
  • Plug,expansion — FSC 5340
  • Radius: 1.094 INCHES NOMINAL IN
  • Material: STEEL
  • Style Designator: CONCAVE
  • Material Thickness: 0.065 INCHES NOMINAL IN
  • Outside Diameter: 0.872 INCHES MINIMUM AND 0.878 INCHES MAXIMUM IN
  • 2 verified cross-references
  • Primary manufacturer: Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.
Applications
  • Applications requiring Steel construction
General Description

The Plug,expansion, cataloged under National Stock Number 5340-00-598-5078, is classified within Federal Supply Class 5340 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.. Government technical data includes 5 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: Cancelled. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5340-00-598-5078
Primary Part Number257
Item NamePlug,expansion
FSC / FSG5340 / 53 — No Item Name Available
ManufacturerPratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.
StatusCANCELLED
Radius1.094 INCHES NOMINAL IN
MaterialSTEEL
Style DesignatorCONCAVE
Material Thickness0.065 INCHES NOMINAL IN
Outside Diameter0.872 INCHES MINIMUM AND 0.878 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Unit of IssueEA
Verified Substitutes 12
No Item Name Available
Power Supply
Standoff,threaded,spacing
5935-00-043-2332257 INTERCHANGEABLE
Jack,telephone
Birnbach Co Inc
3460-00-187-8674 INTERCHANGEABLE
Wheel,abrasive
5915-00-208-4493241-0619-071 INTERCHANGEABLE
Filter,band Pass
Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems
5940-00-235-798701-1008-1-0210 INTERCHANGEABLE
Post,binding,electrical
Concord Electronics, Inc.
5835-00-393-1996 INTERCHANGEABLE
Guide,tape
1560-00-626-7154A257 INTERCHANGEABLE
Lock Assy,blade Int
Marathonnorco Aerospace, Inc.
5965-00-636-2264702019-034 INTERCHANGEABLE
Handset
Dynalec Corporation
Cross-Reference Index
Part NumberManufacturer
257 PRIMARY Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp. (CAN)
A257 PRIMARY Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA)
Related Parts
5340-00-474-3112SUCCESSOR
NO ITEM NAME AVAILABLE
6130-01-140-1778SUCCESSOR
POWER SUPPLY
5340-01-359-6178SUCCESSOR
STANDOFF,THREADED,SPACING
5935-00-043-2332INTERCHANGEABLE
JACK,TELEPHONE
257
3460-00-187-8674INTERCHANGEABLE
WHEEL,ABRASIVE
5915-00-208-4493INTERCHANGEABLE
FILTER,BAND PASS
241-0619-071
5940-00-235-7987INTERCHANGEABLE
POST,BINDING,ELECTRICAL
01-1008-1-0210
5835-00-393-1996INTERCHANGEABLE
GUIDE,TAPE
1560-00-626-7154INTERCHANGEABLE
LOCK ASSY,BLADE INT
A257
5965-00-636-2264INTERCHANGEABLE
HANDSET
702019-034
5975-00-681-0545INTERCHANGEABLE
JUNCTION BOX
257
6680-00-684-1266INTERCHANGEABLE
METER,FLUID FLOW INDICATING,DIFF
17XIXXX0200A5AAXXX01

Frequently Asked Questions

What is NSN 5340-00-598-5078?

NSN 5340-00-598-5078 is a Plug,expansion, manufactured by Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp., classified under FSC 5340 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5340-00-598-5078?

NSN 5340-00-598-5078 has 2 cross-referenced part numbers: 257 (Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.), A257 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).

What NSN replaces 5340-00-598-5078?

There are 12 known substitutes for 5340-00-598-5078: 5340-00-474-3112, 6130-01-140-1778, 5340-01-359-6178 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 257?

Key specifications for 257: Radius: 1.094 INCHES NOMINAL IN; Material: STEEL; Style Designator: CONCAVE; Material Thickness: 0.065 INCHES NOMINAL IN. 5 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5340-00-598-5078 still in active supply?

NSN 5340-00-598-5078 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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