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P21-B — RESISTOR,VARIABLE,WIRE WOUND,NON

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

P21-B: RESISTOR,VARIABLE,WIRE WOUND,NON.

RESISTOR,VARIABLE,WIRE WOUND,NON. Key specifications include material: ALUMINUM OVERALL, style_designator: PULLEY PATTERN, rolling_element_diameter: 0.5000 INCHES NOMINAL IN, standard_tolerance_designation: AFBMA STD TOLERANCE FOR BALLS, GRADE 50, part_name_assigned_by_controlling_agency: PULLEY, MACHINED, MINI. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-100-6186, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
P21-B
NSN: 3110-00-100-6186
NIINs: 001006186, 016644911
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 29690 — CORRECT MFG CORP (USA)
SPECIFICATIONS
materialALUMINUM OVERALL
style_designatorPULLEY PATTERN
rolling_element_diameter0.5000 INCHES NOMINAL IN
standard_tolerance_designationAFBMA STD TOLERANCE FOR BALLS, GRADE 50
part_name_assigned_by_controlling_agencyPULLEY, MACHINED, MINI
NSN3110-00-100-6186
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: P21-B · OEM ⚠ VERIFY BEFORE ORDERING Cup and cone sold separately — verify you are ordering BOTH parts or the correct component. Always replace cup and cone together — mismatched wear = premature failure ✓ BROKER TIP Taper angle determines axial load capacity. Steeper angle = higher axial load rating. Timken series numbers indicate dimensions — cross-reference carefully PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
ROLLING ELEMENT DIAMETER: 0.5000 INCHES NOMINAL IN
•
STYLE DESIGNATOR: BALL
•
STANDARD TOLERANCE DESIGNATION: AFBMA STD TOLERANCE FOR BALLS, GRADE 50
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
ROLLING ELEMENT DIAMETER0.5000 INCHES NOMINAL IN
STYLE DESIGNATORBALL
STANDARD TOLERANCE DESIGNATIONAFBMA STD TOLERANCE FOR BALLS, GRADE 50
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES 8
104922Reference document
Same NSN cross-reference
Reference document — Secondary reference
55133Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
5590Reference document
Same NSN cross-reference
Reference document — Secondary reference
858271Reference document
Same NSN cross-reference
Reference document — Secondary reference
3241219Reference document
Same NSN cross-reference
Reference document — Secondary reference
BB1731Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is P21-B?
P21-B is a RESISTOR,VARIABLE,WIRE WOUND,NON.
What parts can replace P21-B?
There are 8 known substitutes for P21-B: 104922, 55133, 5590 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for P21-B?
P21-B is cataloged in the U.S. Government catalog under NSN 3110-00-100-6186. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.