PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet
MRO / Bearings / 3110-00-507-0021

M591Bearing,roller,needle

Timken Aerospace, Inc Dba Torrington Product · NSN 3110-00-507-0021 · FSC 3110 · No Item Name Available
Verified by PartsTable
NSN 3110-00-507-0021 — this item is cataloged by the U.S. Government under National Stock Number 3110-00-507-0021. Primary manufacturer part number: M591.
⌀0.3120 INCHES NOMINAL IN OD 0.5000 INCHES NOMINAL IN W 0.5620 INCHES NOMINAL IN BALL BEARING — CUTAWAY
3110-00-507-0021 — No Item Name Available illustration
Features
  • Bearing,roller,needle — FSC 3110
  • Bore Diameter: 0.3120 INCHES NOMINAL IN
  • Style Designator: SEPARABLE ROLLERS, CLOSED END, DRAWN SHELL
  • Material: STEEL OVERALL
  • Overall Outside Diameter: 0.5000 INCHES NOMINAL IN
  • 3 verified cross-references
  • Primary manufacturer: Timken Aerospace, Inc Dba Torrington Product
Applications
  • Rotating machinery support and alignment
  • Shaft load distribution
  • Precision spindle assemblies
  • Applications requiring Steel Overall construction
General Description

The Bearing,roller,needle, cataloged under National Stock Number 3110-00-507-0021, is classified within Federal Supply Class 3110 (No Item Name Available) of the Bearings group. The primary manufacturer of record is Timken Aerospace, Inc Dba Torrington Product. Government technical data includes 4 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN3110-00-507-0021
Primary Part NumberM591
Item NameBearing,roller,needle
FSC / FSG3110 / 31 — No Item Name Available
ManufacturerTimken Aerospace, Inc Dba Torrington Product
StatusACTIVE
Bore Diameter0.3120 INCHES NOMINAL IN
Style DesignatorSEPARABLE ROLLERS, CLOSED END, DRAWN SHELL
MaterialSTEEL OVERALL
Overall Outside Diameter0.5000 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
⇄ Verified Substitutes 10
3120-00-050-771021246 INTERCHANGEABLE
Bushing,sleeve
L3harris Technologies, Inc. Div Space and Airborne Systems
3110-00-142-438609195 INTERCHANGEABLE
Cup,tapered Roller Bearing
The Timken Corporation
3110-00-156-4160201KTT3FS381A INTERCHANGEABLE
Bearing,ball,annular
Timken Co Div the Timken Company
5110-00-260-1644 INTERCHANGEABLE
Reamer,hand
3120-00-371-639021-246 INTERCHANGEABLE
Bearing,sleeve
Dresser Industries Inc Leroi Div
5940-00-502-6457304-2720-00 INTERCHANGEABLE
Terminal,lug
Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems
5360-01-178-1425 INTERCHANGEABLE
Spring
6515-01-476-225441204 INTERCHANGEABLE
Shield,face,surgical
Kimberly-Clark Corporation Dba Kimberly-Clark
1680-01-488-744421246 INTERCHANGEABLE
Mounting Flange
Parker Hannifin Corporation Div Hydraulic Systems Division
5975-01-629-649321246 INTERCHANGEABLE
Mounting Base,tie Down,electrica
Waytek Inc
Cross-Reference Index
Part NumberManufacturer
21246 Black and Decker /us/ Inc Dewalt Div (USA)
21246 Black and Decker Us Inc (USA)
M591 PRIMARY Timken Aerospace, Inc Dba Torrington Product (USA)
Related Parts
3120-00-050-7710INTERCHANGEABLE
BUSHING,SLEEVE
21246
3110-00-142-4386INTERCHANGEABLE
CUP,TAPERED ROLLER BEARING
09195
3110-00-156-4160INTERCHANGEABLE
BEARING,BALL,ANNULAR
201KTT3FS381A
5110-00-260-1644INTERCHANGEABLE
REAMER,HAND
3120-00-371-6390INTERCHANGEABLE
BEARING,SLEEVE
21-246
5940-00-502-6457INTERCHANGEABLE
TERMINAL,LUG
304-2720-00
5360-01-178-1425INTERCHANGEABLE
SPRING
6515-01-476-2254INTERCHANGEABLE
SHIELD,FACE,SURGICAL
41204
1680-01-488-7444INTERCHANGEABLE
MOUNTING FLANGE
21246
5975-01-629-6493INTERCHANGEABLE
MOUNTING BASE,TIE DOWN,ELECTRICA
21246

Frequently Asked Questions

What is NSN 3110-00-507-0021?

NSN 3110-00-507-0021 is a Bearing,roller,needle, manufactured by Timken Aerospace, Inc Dba Torrington Product, classified under FSC 3110 (No Item Name Available). Status: active.

What are the part numbers for NSN 3110-00-507-0021?

NSN 3110-00-507-0021 has 3 cross-referenced part numbers: 21246 (Black and Decker /us/ Inc Dewalt Div), 21246 (Black and Decker Us Inc), M591 (Timken Aerospace, Inc Dba Torrington Product).

What NSN replaces 3110-00-507-0021?

There are 10 known substitutes for 3110-00-507-0021: 3120-00-050-7710, 3110-00-142-4386, 3110-00-156-4160 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of M591?

Key specifications for M591: Bore Diameter: 0.3120 INCHES NOMINAL IN; Style Designator: SEPARABLE ROLLERS, CLOSED END, DRAWN SHELL; Material: STEEL OVERALL; Overall Width: 0.5620 INCHES NOMINAL IN. 5 total characteristics are documented in the Federal Logistics Information System.

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