PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4439Collar,clutch Throw

Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic · NSN 2520-00-496-2109 · FSC 2520 · No Item Name Available
Verified by PartsTable
NSN 2520-00-496-2109 — this item is cataloged by the U.S. Government under National Stock Number 2520-00-496-2109. Primary manufacturer part number: 4439.
Features
  • Collar,clutch Throw — FSC 2520
  • General Characteristics Item Description: MALLEABLE IRON;5.875 IN. O/A DIA;3.988 IN. GROOVE DIA IN
  • 2 verified cross-references
  • Primary manufacturer: Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Collar,clutch Throw, cataloged under National Stock Number 2520-00-496-2109, is classified within Federal Supply Class 2520 (No Item Name Available) of the Vehicular Equipment Components group. The primary manufacturer of record is Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic. Government technical data includes 1 verified specification, 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: Active.

Technical Specifications
ParameterValue
NSN2520-00-496-2109
Primary Part Number4439
Item NameCollar,clutch Throw
FSC / FSG2520 / 25 — No Item Name Available
ManufacturerTwin Disc, Incorporated Dba Twin Disc Mid-Atlantic
StatusACTIVE
General Characteristics Item DescriptionMALLEABLE IRON;5.875 IN. O/A DIA;3.988 IN. GROOVE DIA IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5999-00-081-608244-39 INTERCHANGEABLE
Delay Line
Esc Control Electronics Llc Dba Control Electronics Division of Fil-Coil
5120-00-116-3134 INTERCHANGEABLE
Die,crimping Tool
3020-00-265-77472B5270 INTERCHANGEABLE
Gear,helical
Fwd Seagrave Holdings Lp
5905-00-280-0990L25J5K0E INTERCHANGEABLE
Resistor,fixed,wire Wound,induct
Ohmite Holding, L.l.c. Dba Ohmite Manufacturing
5320-00-281-9010 INTERCHANGEABLE
Rivet,tubular
5930-00-488-9976 INTERCHANGEABLE
Switch,pressure
5920-00-577-86744439 INTERCHANGEABLE
Fuseholder,block
Cooper Bussmann, Llc Dba Cooper Industries
7045-01-074-7626882 INTERCHANGEABLE
Disk Pack
Control Data Systems Inc Engineering Services Div
5305-01-095-39674439 INTERCHANGEABLE
Screw,shoulder
Roller Bearing Co of America, Inc Div Pic Design
5305-01-116-9172 INTERCHANGEABLE
Screw,shoulder
Cross-Reference Index
Part NumberManufacturer
0212 Blaw Knox Corp Blaw-Knox Equipment Div (USA)
4439 PRIMARY Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA)
Related Parts
5999-00-081-6082INTERCHANGEABLE
DELAY LINE
44-39
5120-00-116-3134INTERCHANGEABLE
DIE,CRIMPING TOOL
3020-00-265-7747INTERCHANGEABLE
GEAR,HELICAL
2B5270
5905-00-280-0990INTERCHANGEABLE
RESISTOR,FIXED,WIRE WOUND,INDUCT
L25J5K0E
5320-00-281-9010INTERCHANGEABLE
RIVET,TUBULAR
5930-00-488-9976INTERCHANGEABLE
SWITCH,PRESSURE
5920-00-577-8674INTERCHANGEABLE
FUSEHOLDER,BLOCK
4439
7045-01-074-7626INTERCHANGEABLE
DISK PACK
882
5305-01-095-3967INTERCHANGEABLE
SCREW,SHOULDER
4439
5305-01-116-9172INTERCHANGEABLE
SCREW,SHOULDER
5905-01-185-5578INTERCHANGEABLE
RESISTOR,FIXED,WIRE WOUND,INDUCT
6240-01-345-2255INTERCHANGEABLE
LAMP,METAL HALIDE
57330

Frequently Asked Questions

What is NSN 2520-00-496-2109?

NSN 2520-00-496-2109 is a Collar,clutch Throw, manufactured by Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic, classified under FSC 2520 (No Item Name Available). Status: active.

What are the part numbers for NSN 2520-00-496-2109?

NSN 2520-00-496-2109 has 2 cross-referenced part numbers: 0212 (Blaw Knox Corp Blaw-Knox Equipment Div), 4439 (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic).

What NSN replaces 2520-00-496-2109?

There are 12 known substitutes for 2520-00-496-2109: 5999-00-081-6082, 5120-00-116-3134, 3020-00-265-7747 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 4439?

Key specifications for 4439: General Characteristics Item Description: MALLEABLE IRON;5.875 IN. O/A DIA;3.988 IN. GROOVE DIA IN. 1 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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