PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

307561Washer,spring Tension

Lewmar Ltd · NSN 5310-00-115-2530 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-115-2530 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-115-2530. Primary manufacturer part number: 307561.
Features
  • Washer,spring Tension — FSC 5310
  • Outside Diameter: 1.250 INCHES NOMINAL IN
  • Style Designator: SPRING TENSION
  • Material Thickness: 0.0797 INCHES MINIMUM AND 0.0997 INCHES MAXIMUM IN
  • Features Provided: CASEHARDENED
  • Hole Diameter: 0.324 INCHES MINIMUM AND 0.330 INCHES MAXIMUM IN
  • Material: STEEL COMP 1010 OVERALL
  • Hardness Rating: 88.0 ROCKWELL SUPERFICIAL 15-N MINIMUM
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Mechanical energy storage
  • Vibration dampening
General Description

The Washer,spring Tension, cataloged under National Stock Number 5310-00-115-2530, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Lewmar Ltd. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5310-00-115-2530
Primary Part Number307561
Item NameWasher,spring Tension
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerLewmar Ltd
StatusCANCELLED
Outside Diameter1.250 INCHES NOMINAL IN
Style DesignatorSPRING TENSION
Material Thickness0.0797 INCHES MINIMUM AND 0.0997 INCHES MAXIMUM IN
Features ProvidedCASEHARDENED
Hole Diameter0.324 INCHES MINIMUM AND 0.330 INCHES MAXIMUM IN
MaterialSTEEL COMP 1010 OVERALL
Hardness Rating88.0 ROCKWELL SUPERFICIAL 15-N MINIMUM
Material Document and ClassificationSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
6150-00-075-989810105385-8 INTERCHANGEABLE
Cable Assembly,special Purpose,e
Us Army Aviation and Missile Command
4720-00-202-9319 INTERCHANGEABLE
Hose Assembly,nonmetallic
5120-00-277-5072 INTERCHANGEABLE
Wrench,open End Box
5305-00-349-81714148 INTERCHANGEABLE
Screw,tongue
Wakmann Watch Company Inc
5340-00-431-8854 INTERCHANGEABLE
Plug,expansion
5985-00-737-62684148 INTERCHANGEABLE
Coupler,directional
Bird Electronic Corporation Div Bird Electronic Corp
6625-00-894-2590 INTERCHANGEABLE
Lead,test
7530-00-985-2145 INTERCHANGEABLE
Pad,writing Paper
5305-01-195-50524148 INTERCHANGEABLE
Screw,shoulder
Husco International Inc
3010-01-269-32454148 INTERCHANGEABLE
Drive Unit,angle
Vemaline Products Inc Dba Handles Unlimited Div Handles Unlimited
Cross-Reference Index
Part NumberManufacturer
307561 Lewmar Ltd (GBR)
307561 Outboard Marine Corp Johnson Motors Div (USA)
41-48 Outboard Marine Corp Johnson Motors Div (USA)
307561 Simpson-Lawrence Ltd Johnson and Evi Rude Outboard Motors (GBR)
Related Parts
6150-00-075-9898INTERCHANGEABLE
CABLE ASSEMBLY,SPECIAL PURPOSE,E
10105385-8
4720-00-202-9319INTERCHANGEABLE
HOSE ASSEMBLY,NONMETALLIC
5120-00-277-5072INTERCHANGEABLE
WRENCH,OPEN END BOX
5305-00-349-8171INTERCHANGEABLE
SCREW,TONGUE
4148
5340-00-431-8854INTERCHANGEABLE
PLUG,EXPANSION
5985-00-737-6268INTERCHANGEABLE
COUPLER,DIRECTIONAL
4148
6625-00-894-2590INTERCHANGEABLE
LEAD,TEST
7530-00-985-2145INTERCHANGEABLE
PAD,WRITING PAPER
5305-01-195-5052INTERCHANGEABLE
SCREW,SHOULDER
4148
3010-01-269-3245INTERCHANGEABLE
DRIVE UNIT,ANGLE
4148
5330-01-303-3921INTERCHANGEABLE
SEAL,PLAIN ENCASED
4148
5305-01-305-1828INTERCHANGEABLE
SCREW,MACHINE
4148

Frequently Asked Questions

What is NSN 5310-00-115-2530?

NSN 5310-00-115-2530 is a Washer,spring Tension, manufactured by Lewmar Ltd, classified under FSC 5310 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5310-00-115-2530?

NSN 5310-00-115-2530 has 4 cross-referenced part numbers: 307561 (Lewmar Ltd), 307561 (Outboard Marine Corp Johnson Motors Div), 41-48 (Outboard Marine Corp Johnson Motors Div), 307561 (Simpson-Lawrence Ltd Johnson and Evi Rude Outboard Motors).

What NSN replaces 5310-00-115-2530?

There are 12 known substitutes for 5310-00-115-2530: 6150-00-075-9898, 4720-00-202-9319, 5120-00-277-5072 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 307561?

Key specifications for 307561: Outside Diameter: 1.250 INCHES NOMINAL IN; Style Designator: SPRING TENSION; Material Thickness: 0.0797 INCHES MINIMUM AND 0.0997 INCHES MAXIMUM IN; Features Provided: CASEHARDENED. 9 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5310-00-115-2530 still in active supply?

NSN 5310-00-115-2530 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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