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PartsTable / COMPONENT / 3B1143
3B1143 ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The LOCK,VALVE SPRING RETAINER is a the manufacturer industrial component. Key specifications include material: STEEL, overall_height: 0.545 INCHES MINIMUM AND 0.547 INCHES MAXIMUM IN, special_features: SIMULA TO STYLE 25 EXCEPT TAPERED BORE 2.500 PER FT TO COUNTERSINK; SPLINT IN THREE SECTIONS 120 DEG, style_designator: STRAIGHT COUNTERSINK BORE-STRAIGHT SIDES, thread_provision: UNTHREADED, casehardening_indicator: CASEHARDENED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2815-00-365-2275, 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
3B1143
NSN: 2815-00-365-2275
FSC: 2815
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialSTEEL
overall_height0.545 INCHES MINIMUM AND 0.547 INCHES MAXIMUM IN
special_featuresSIMULA TO STYLE 25 EXCEPT TAPERED BORE 2.500 PER FT TO COUNTERSINK; SPLINT IN THREE SECTIONS 120 DEG
style_designatorSTRAIGHT COUNTERSINK BORE-STRAIGHT SIDES
thread_provisionUNTHREADED
casehardening_indicatorCASEHARDENED
largest_inside_diameter0.375 INCHES NOMINAL IN
minimum_inside_diameter0.493 INCHES IN
largest_outside_diameter0.654 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN
inside_included_angle_in_deg105.0
largest_top_countersink_diameter0.469 INCHES NOMINAL IN
top_countersink_included_angle_in_deg30.0
NSN2815-00-365-2275
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available LOCK,VALVE SPRING RETAINER TITLE COMPONENT PN 3B1143 MFR LOCK,VALVE SPRING RETA
KEY FEATURES
•
LARGEST OUTSIDE DIAMETER: 0.654 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN
•
TOP COUNTERSINK INCLUDED ANGLE IN DEG: 30.0
•
STYLE DESIGNATOR: STRAIGHT COUNTERSINK BORE-STRAIGHT SIDES
•
THREAD PROVISION: UNTHREADED
•
MINIMUM INSIDE DIAMETER: 0.493 INCHES IN
•
LARGEST TOP COUNTERSINK DIAMETER: 0.469 INCHES NOMINAL IN
•
INSIDE INCLUDED ANGLE IN DEG: 105.0
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESSIMULA TO STYLE 25 EXCEPT TAPERED BORE 2.500 PER FT TO COUNTERSINK; SPLINT IN THREE SECTIONS 120 DEG
LARGEST OUTSIDE DIAMETER0.654 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN
TOP COUNTERSINK INCLUDED ANGLE IN DEG30.0
STYLE DESIGNATORSTRAIGHT COUNTERSINK BORE-STRAIGHT SIDES
THREAD PROVISIONUNTHREADED
MINIMUM INSIDE DIAMETER0.493 INCHES IN
LARGEST TOP COUNTERSINK DIAMETER0.469 INCHES NOMINAL IN
INSIDE INCLUDED ANGLE IN DEG105.0
LARGEST INSIDE DIAMETER0.375 INCHES NOMINAL IN
MATERIALSTEEL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
321143Interchangeable
interchangeable cross-reference
interchangeable
U135Interchangeable
interchangeable cross-reference
interchangeable
A84143Interchangeable
interchangeable cross-reference
interchangeable
R155Interchangeable
interchangeable cross-reference
interchangeable
N211Interchangeable
interchangeable cross-reference
interchangeable
PWA23391Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3B1143?
3B1143 is a LOCK,VALVE SPRING RETAINER.
What parts can replace 3B1143?
There are 17 known substitutes for 3B1143: 321143, U135, A84143 and 14 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3B1143?
3B1143 is cataloged in the Federal Logistics Information System (FLIS) under NSN 2815-00-365-2275. 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