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Technical Data Sheet
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SR166 ✓ Verified by PartsTable
— · TAPERED BEARING
WHAT YOU NEED TO KNOW
Cup and cone sold separately — confirm both needed Timken series numbers indicate dimensions
Cup and cone NOT sold as set — verify order
PRODUCT OVERVIEW

The RELAY,ELECTROMAGNETIC is a the manufacturer industrial component. Key specifications include length: 0.250 INCHES NOMINAL IN, material: STEEL COMP 630 OVERALL, duty_type: INTERMITTENT, bore_shape: STRAIGHT, insert_size: 0.216-28 NF 2A A, bore_diameter: 0.1875 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-277-0314, 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
SR166
NSN: 3110-00-277-0314
FSC: 3110
CAGE: 83086 — NEW HAMPSHIRE BALL BEARINGS INC DIV HITECH DIVISION (USA)
SPECIFICATIONS
length0.250 INCHES NOMINAL IN
materialSTEEL COMP 630 OVERALL
duty_typeINTERMITTENT
bore_shapeSTRAIGHT
insert_size0.216-28 NF 2A A
bore_diameter0.1875 INCHES NOMINAL IN
coil_quantity1
overall_width1.150 INCHES NOMINAL IN
load_directionRADIAL
overall_height2.750 INCHES NOMINAL IN
overall_length2.750 INCHES NOMINAL IN
surface_finishGROUND
NSN3110-00-277-0314
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: SR166 · 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
•
STYLE DESIGNATOR: NON-LOADING GROOVE, NON-SEPARABLE
•
BORE DIAMETER: 0.1875 INCHES NOMINAL IN
•
SURFACE FINISH: GROUND
•
LOAD DIRECTION: RADIAL
•
INTERNAL CLEARANCE: 0.0002 INCHES MINIMUM RADIAL AND 0.0005 INCHES MAXIMUM RADIAL IN
•
BORE SHAPE: STRAIGHT
•
INTERNAL FIT-UP DESIGNATION: STANDARD
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORNON-LOADING GROOVE, NON-SEPARABLE
BORE DIAMETER0.1875 INCHES NOMINAL IN
SURFACE FINISHGROUND
LOAD DIRECTIONRADIAL
INTERNAL CLEARANCE0.0002 INCHES MINIMUM RADIAL AND 0.0005 INCHES MAXIMUM RADIAL IN
OVERALL WIDTH0.1250 INCHES NOMINAL IN
BORE SHAPESTRAIGHT
INTERNAL FIT-UP DESIGNATIONSTANDARD
OVERALL OUTSIDE DIAMETER0.3750 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONABEC NO.5
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
991-15256-3300Interchangeable
interchangeable cross-reference
interchangeable
28965-14-7SInterchangeable
interchangeable cross-reference
interchangeable
TO9H8-30-12-24FIG1-63Interchangeable
interchangeable cross-reference
interchangeable
SR166Interchangeable
interchangeable cross-reference
interchangeable
R1271P04Interchangeable
interchangeable cross-reference
interchangeable
T11Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SR166?
SR166 is a RELAY,ELECTROMAGNETIC.
What parts can replace SR166?
There are 10 known substitutes for SR166: 991-15256-3300, 28965-14-7S, TO9H8-30-12-24FIG1-63 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SR166?
SR166 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-277-0314. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026