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123831 — BEARING UNIT,BALL

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

123831: BEARING UNIT,BALL.

The BEARING UNIT,BALL is a the manufacturer industrial component. Key specifications include material: STEEL BEARING, seal_type: CONTACT, block_type: FIXED, base_length: 1.0625 INCHES NOMINAL IN, bore_diameter: 0.6250 INCHES NOMINAL IN, housing_width: 5.0625 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3130-01-123-7217, 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
123831
NSN: 3130-01-123-7217
NIINs: 011237217, 012229745
FSC: 3130 — Bearings, Mounted
CAGE: 71956 — RELIANCE ELECTRIC COMPANY DBA RELIANCE & DODGE BRANDS (USA)
SPECIFICATIONS
materialSTEEL BEARING
seal_typeCONTACT
block_typeFIXED
base_length1.0625 INCHES NOMINAL IN
bore_diameter0.6250 INCHES NOMINAL IN
housing_width5.0625 INCHES NOMINAL IN
seal_locationBOTH ENDS
alignment_typeSELF-ALIGNING
base_thickness0.6250 INCHES NOMINAL IN
housing_height2.1562 INCHES NOMINAL IN
shaft_end_typeOPEN
style_designatorPILLOW BLOCK, SOLID
NSN3130-01-123-7217
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 123831 · OEM ⚠ VERIFY BEFORE ORDERING ABEC grade: higher = tighter tolerance = higher cost. ABEC-1 is standard, ABEC-7+ for precision spindles. Open, shielded (ZZ), and sealed (2RS) versions have different max RPM ratings ✓ BROKER TIP 2RS = sealed for life (no maintenance). ZZ = shielded, re-greaseable. Open = must lubricate on install. Common interchange: 6205-2RS = 6205-2RSR = 6205-DDU (same bearing, different suffix) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SEAL TYPE: CONTACT
•
LUBRICATION MATERIAL: GREASE
•
LUBRICATION FITTING TYPE: HYDRAULIC
•
ASSEMBLY OVERALL LENGTH: 1.1719 INCHES NOMINAL IN
•
HOUSING HEIGHT: 2.1562 INCHES NOMINAL IN
•
MOUNTING SLOT LENGTH: 0.5625 INCHES NOMINAL IN
•
INTERNAL FIT-UP DESIGNATION: STANDARD
•
MOUNTING HOLE TYPE: SLOTTED
TECHNICAL CHARACTERISTICS
SEAL TYPECONTACT
LUBRICATION MATERIALGREASE
LUBRICATION FITTING TYPEHYDRAULIC
ASSEMBLY OVERALL LENGTH1.1719 INCHES NOMINAL IN
HOUSING HEIGHT2.1562 INCHES NOMINAL IN
MOUNTING SLOT LENGTH0.5625 INCHES NOMINAL IN
INTERNAL FIT-UP DESIGNATIONSTANDARD
MOUNTING HOLE TYPESLOTTED
ROTATING ELEMENT LOCKING METHODDIRECT
SEAL LOCATIONBOTH ENDS
SUBSTITUTES & CROSS-REFERENCES 2
B22944Reference document
Same NSN cross-reference
Reference document — Secondary reference
SC 5/8 203 PILLOW BLOCKReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 123831?
123831 is a BEARING UNIT,BALL.
What parts can replace 123831?
There are 2 known substitutes for 123831: B22944, SC 5/8 203 PILLOW BLOCK. Substitute compatibility should be verified for your specific system.
What is the NSN for 123831?
123831 is cataloged in the U.S. Government catalog under NSN 3130-01-123-7217. 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.