PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

27-257Spring,helical,extension

Asco Power Services Inc Dba Asco Emergency Power Maintenance Incorporated · NSN 5360-00-446-2652 · FSC 5360 · No Item Name Available
Verified by PartsTable
NSN 5360-00-446-2652 — this item is cataloged by the U.S. Government under National Stock Number 5360-00-446-2652. Primary manufacturer part number: 27-257.
Features
  • Spring,helical,extension — FSC 5360
  • Opening Width: 0.062 INCHES NOMINAL BOTH ENDS IN
  • Inside Diameter: 0.312 INCHES NOMINAL IN
  • Coil Helix Direction: RIGHT-HAND OR LEFT-HAND
  • End Style: MACHINED HALF LOOP BOTH ENDS
  • Surface Treatment: PASSIVATE OVERALL
  • Coil Quantity: 14
  • Hook Radius: 0.156 INCHES NOMINAL BOTH ENDS IN
Applications
  • Mechanical energy storage
  • Vibration dampening
  • Return mechanism operation
  • Applications requiring Steel Comp 304 Overall construction
General Description

The Spring,helical,extension, cataloged under National Stock Number 5360-00-446-2652, is classified within Federal Supply Class 5360 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Asco Power Services Inc Dba Asco Emergency Power Maintenance Incorporated. Government technical data includes 13 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. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5360-00-446-2652
Primary Part Number27-257
Item NameSpring,helical,extension
FSC / FSG5360 / 53 — No Item Name Available
ManufacturerAsco Power Services Inc Dba Asco Emergency Power Maintenance Incorporated
StatusCANCELLED
Opening Width0.062 INCHES NOMINAL BOTH ENDS IN
Inside Diameter0.312 INCHES NOMINAL IN
Coil Helix DirectionRIGHT-HAND OR LEFT-HAND
End StyleMACHINED HALF LOOP BOTH ENDS
Surface TreatmentPASSIVATE OVERALL
Coil Quantity14
Hook Radius0.156 INCHES NOMINAL BOTH ENDS IN
MaterialSTEEL COMP 304 OVERALL
Spring Free Length1.225 INCHES NOMINAL IN
Material Document and ClassificationQQ-W-423,COND B FED SPEC SINGLE MATERIAL RESPONSE OVERALL
Design TypeCLOSED
Style DesignatorCYLINDRICAL
Spring Free Outside Diameter0.426 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 4
5330-00-641-0974350224 INTERCHANGEABLE
Seal,plain Encased
Skf Usa Inc. Dba Skf Aerospace Sealing Solutions
2910-00-848-406127257 INTERCHANGEABLE
Tank,fuel Unit
Tiffin Parts, L.l.c. Div Subsidiary of Pettibone Corp.
4730-01-254-490227257 INTERCHANGEABLE
Tee,pipe
United States Plastic Corp
4330-01-272-560427257 INTERCHANGEABLE
Filter,fluid
Pall Aeropower Corp Sub of Pall Corp Mectron Industries Div
Cross-Reference Index
Part NumberManufacturer
27-257 PRIMARY Asco Power Services Inc Dba Asco Emergency Power Maintenance Incorporated (USA)
27-257 Automatic Switch Company Dba Asco (USA)
Related Parts
5330-00-641-0974INTERCHANGEABLE
SEAL,PLAIN ENCASED
350224
2910-00-848-4061INTERCHANGEABLE
TANK,FUEL UNIT
27257
4730-01-254-4902INTERCHANGEABLE
TEE,PIPE
27257
4330-01-272-5604INTERCHANGEABLE
FILTER,FLUID
27257

Frequently Asked Questions

What is NSN 5360-00-446-2652?

NSN 5360-00-446-2652 is a Spring,helical,extension, manufactured by Asco Power Services Inc Dba Asco Emergency Power Maintenance Incorporated, classified under FSC 5360 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5360-00-446-2652?

NSN 5360-00-446-2652 has 2 cross-referenced part numbers: 27-257 (Asco Power Services Inc Dba Asco Emergency Power Maintenance Incorporated), 27-257 (Automatic Switch Company Dba Asco).

What NSN replaces 5360-00-446-2652?

There are 4 known substitutes for 5360-00-446-2652: 5330-00-641-0974, 2910-00-848-4061, 4730-01-254-4902 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 27-257?

Key specifications for 27-257: Opening Width: 0.062 INCHES NOMINAL BOTH ENDS IN; Inside Diameter: 0.312 INCHES NOMINAL IN; Coil Helix Direction: RIGHT-HAND OR LEFT-HAND; End Style: MACHINED HALF LOOP BOTH ENDS. 13 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5360-00-446-2652 still in active supply?

NSN 5360-00-446-2652 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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