PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

56703Pulley,special

Westerbeke Corporation · NSN 2990-01-688-2657 · FSC 2990 · No Item Name Available
Verified by PartsTable
NSN 2990-01-688-2657 — this item is cataloged by the U.S. Government under National Stock Number 2990-01-688-2657. Primary manufacturer part number: 56703.
Features
  • Pulley,special — FSC 2990
  • 1 verified cross-reference
  • Primary manufacturer: Westerbeke Corporation
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Pulley,special, cataloged under National Stock Number 2990-01-688-2657, is classified within Federal Supply Class 2990 (No Item Name Available) of the Engine Accessories group. The primary manufacturer of record is Westerbeke Corporation. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN2990-01-688-2657
Primary Part Number56703
Item NamePulley,special
FSC / FSG2990 / 29 — No Item Name Available
ManufacturerWesterbeke Corporation
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
3455-00-275-1942 INTERCHANGEABLE
Cutter,milling,end
4730-00-278-5688 INTERCHANGEABLE
Adapter,straight,tube to Hose
5365-00-708-5693056703 INTERCHANGEABLE
Shim
Eaton Aerospace, Llc Dba Jackson South
4720-01-242-6353 INTERCHANGEABLE
Hose Assembly,nonmetallic
3040-01-461-5128 INTERCHANGEABLE
Collar,shaft
3040-01-462-90028M0034918 INTERCHANGEABLE
Collar,shaft
Brunswick Corp Mercury Marine Div Government Sales
Cross-Reference Index
Part NumberManufacturer
56703 PRIMARY Westerbeke Corporation (USA)
Related Parts
3455-00-275-1942INTERCHANGEABLE
CUTTER,MILLING,END
4730-00-278-5688INTERCHANGEABLE
ADAPTER,STRAIGHT,TUBE TO HOSE
5365-00-708-5693INTERCHANGEABLE
SHIM
056703
4720-01-242-6353INTERCHANGEABLE
HOSE ASSEMBLY,NONMETALLIC
3040-01-461-5128INTERCHANGEABLE
COLLAR,SHAFT
3040-01-462-9002INTERCHANGEABLE
COLLAR,SHAFT
8M0034918

Frequently Asked Questions

What is NSN 2990-01-688-2657?

NSN 2990-01-688-2657 is a Pulley,special, manufactured by Westerbeke Corporation, classified under FSC 2990 (No Item Name Available). Status: active.

What are the part numbers for NSN 2990-01-688-2657?

NSN 2990-01-688-2657 has 1 cross-referenced part number: 56703 (Westerbeke Corporation).

What NSN replaces 2990-01-688-2657?

There are 6 known substitutes for 2990-01-688-2657: 3455-00-275-1942, 4730-00-278-5688, 5365-00-708-5693 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 56703?

Key specifications for 56703: End Item Identification: GENERATOR SET; Part Name Assigned by Controlling Agency: PULLEY,CRANKSHAFT. 2 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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