PartsTable TECHNICAL DATA SHEET
AUGUST 2026Technical Data Sheet

581-6726890-AY98Block,tackle

Naval Sea Systems Command · NSN 3940-01-489-1464 · FSC 3940 · No Item Name Available
Verified by PartsTable
NSN 3940-01-489-1464 — this item is cataloged by the U.S. Government under National Stock Number 3940-01-489-1464. Primary manufacturer part number: 581-6726890-AY98.
Features
  • Block,tackle — FSC 3940
  • Sheave Quantity: 2
  • Material: STEEL OVERALL
  • Style Designator: OVAL PATTERN
  • Functional Description: AFT COMPLIANT SHEAVE ASSY
  • Block Type: REGULAR
  • Shell Length: 61.750 INCHES NOMINAL IN
  • 3 verified cross-references
Applications
  • Applications requiring Steel Overall construction
General Description

The Block,tackle, cataloged under National Stock Number 3940-01-489-1464, is classified within Federal Supply Class 3940 (No Item Name Available) of the Materials Handling Equipment group. The primary manufacturer of record is Naval Sea Systems Command. Government technical data includes 6 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN3940-01-489-1464
Primary Part Number581-6726890-AY98
Item NameBlock,tackle
FSC / FSG3940 / 39 — No Item Name Available
ManufacturerNaval Sea Systems Command
StatusACTIVE
Sheave Quantity2
MaterialSTEEL OVERALL
Style DesignatorOVAL PATTERN
Functional DescriptionAFT COMPLIANT SHEAVE ASSY
Block TypeREGULAR
Shell Length61.750 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 11
3120-01-487-6373KSC352548V INTERCHANGEABLE
Bearing,plain,spherical
Kamatics Corporation
3120-01-487-6377KSC348656V INTERCHANGEABLE
Bearing,plain,spherical
Kamatics Corporation
3120-01-487-6387KNRJ96-UDV-062-2 INTERCHANGEABLE
Bearing,sleeve
Kamatics Corporation
3120-01-487-6438KNRJ48-UDV-046-8 INTERCHANGEABLE
Bearing,sleeve
Kamatics Corporation
3120-01-487-6519KNRJ60-UDV-096-8 INTERCHANGEABLE
Bearing,sleeve
Kamatics Corporation
3120-01-487-6740581-6726890-24 INTERCHANGEABLE
Bearing,washer,thrust
Naval Sea Systems Command
3120-01-487-6744581-6726890-23 INTERCHANGEABLE
Bearing,washer,thrust
Naval Sea Systems Command
5365-01-487-6763581-6726890-33 INTERCHANGEABLE
Spacer,ring
Naval Sea Systems Command
5365-01-487-6766581-6726890-64 INTERCHANGEABLE
Shim
Naval Sea Systems Command
5365-01-487-6924581-6726890-70 INTERCHANGEABLE
Spacer,ring
Naval Sea Systems Command
Cross-Reference Index
Part NumberManufacturer
14901338 Naval Sea Systems Command (USA)
581-6726890-AY98 PRIMARY Naval Sea Systems Command (USA)
6726890 Naval Sea Systems Command (USA)
Related Parts
3120-01-487-6373INTERCHANGEABLE
BEARING,PLAIN,SPHERICAL
KSC352548V
3120-01-487-6377INTERCHANGEABLE
BEARING,PLAIN,SPHERICAL
KSC348656V
3120-01-487-6387INTERCHANGEABLE
BEARING,SLEEVE
KNRJ96-UDV-062-2
3120-01-487-6438INTERCHANGEABLE
BEARING,SLEEVE
KNRJ48-UDV-046-8
3120-01-487-6519INTERCHANGEABLE
BEARING,SLEEVE
KNRJ60-UDV-096-8
3120-01-487-6740INTERCHANGEABLE
BEARING,WASHER,THRUST
581-6726890-24
3120-01-487-6744INTERCHANGEABLE
BEARING,WASHER,THRUST
581-6726890-23
5365-01-487-6763INTERCHANGEABLE
SPACER,RING
581-6726890-33
5365-01-487-6766INTERCHANGEABLE
SHIM
581-6726890-64
5365-01-487-6924INTERCHANGEABLE
SPACER,RING
581-6726890-70
3040-01-488-5565INTERCHANGEABLE
SHAFT,SHOULDERED
581-6726890-19

Frequently Asked Questions

What is NSN 3940-01-489-1464?

NSN 3940-01-489-1464 is a Block,tackle, manufactured by Naval Sea Systems Command, classified under FSC 3940 (No Item Name Available). Status: active.

What are the part numbers for NSN 3940-01-489-1464?

NSN 3940-01-489-1464 has 3 cross-referenced part numbers: 14901338 (Naval Sea Systems Command), 581-6726890-AY98 (Naval Sea Systems Command), 6726890 (Naval Sea Systems Command).

What NSN replaces 3940-01-489-1464?

There are 11 known substitutes for 3940-01-489-1464: 3120-01-487-6373, 3120-01-487-6377, 3120-01-487-6387 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 581-6726890-AY98?

Key specifications for 581-6726890-AY98: Sheave Quantity: 2; Material: STEEL OVERALL; Style Designator: OVAL PATTERN; Functional Description: AFT COMPLIANT SHEAVE ASSY. 7 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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