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Technical Data Sheet
PartsTable / COMPONENT / P21770
P21770 ✓ Verified by PartsTable
— · BALL BEARING
WHAT YOU NEED TO KNOW
2RS = sealed for life, ZZ = shielded re-greaseable ABEC grade: higher = tighter tolerance
ABEC-1 standard, ABEC-7+ for precision spindles
PRODUCT OVERVIEW

The BEARING,PLAIN,SELF-ALIGNING is a the manufacturer industrial component. Key specifications include material: GREASE LUBRICATION, bore_diameter: 1.9995 INCHES MINIMUM AND 2.0000 INCHES MAXIMUM IN, hardness_rating: 36.0 ROCKWELL C MINIMUM INNER MEMBER, style_designator: WITH INSERT AND/OR LINER WITH STAKING GROOVE, inner_member_width: 1.9950 INCHES MINIMUM AND 2.0000 INCHES MAXIMUM IN, outer_member_width: 1.5950 INCHES MINIMUM AND 1.6000 INCHES MAXIMUM 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 3120-01-188-7700, 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
P21770
NSN: 3120-01-188-7700
FSC: 3120
CAGE: 57606 — REXNORD INDUSTRIES, LLC DBA PSI BEARINGS DIV PSI BEARINGS (USA)
SPECIFICATIONS
materialGREASE LUBRICATION
bore_diameter1.9995 INCHES MINIMUM AND 2.0000 INCHES MAXIMUM IN
hardness_rating36.0 ROCKWELL C MINIMUM INNER MEMBER
style_designatorWITH INSERT AND/OR LINER WITH STAKING GROOVE
inner_member_width1.9950 INCHES MINIMUM AND 2.0000 INCHES MAXIMUM IN
outer_member_width1.5950 INCHES MINIMUM AND 1.6000 INCHES MAXIMUM IN
lubrication_featureGROOVE AND PERFORATION OUTER RACE MEMBER
outer_member_outside_diameter3.6865 INCHES MINIMUM AND 3.6875 INCHES MAXIMUM IN
material_document_and_classificationQQ-C-465 FED SPEC SINGLE MATERIAL RESPONSE RACE INSERT
NSN3120-01-188-7700
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: P21770 · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OUTER RACE MEMBER
•
OUTER MEMBER WIDTH: 1.5950 INCHES MINIMUM AND 1.6000 INCHES MAXIMUM IN
•
OUTER MEMBER OUTSIDE DIAMETER: 3.6865 INCHES MINIMUM AND 3.6875 INCHES MAXIMUM IN
•
MATERIAL: COPPER ALLOY INNER MEMBER
•
INNER MEMBER WIDTH: 1.9950 INCHES MINIMUM AND 2.0000 INCHES MAXIMUM IN
•
LUBRICATION FEATURE: GROOVE AND PERFORATION INNER MEMBER
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OUTER RACE MEMBER
OUTER MEMBER WIDTH1.5950 INCHES MINIMUM AND 1.6000 INCHES MAXIMUM IN
OUTER MEMBER OUTSIDE DIAMETER3.6865 INCHES MINIMUM AND 3.6875 INCHES MAXIMUM IN
MATERIALCOPPER ALLOY INNER MEMBER
INNER MEMBER WIDTH1.9950 INCHES MINIMUM AND 2.0000 INCHES MAXIMUM IN
MATERIALSTEEL COMP 630 OUTER RACE MEMBER
LUBRICATION FEATUREGROOVE AND PERFORATION INNER MEMBER
LUBRICATION FEATUREGROOVE AND PERFORATION OUTER RACE MEMBER
MATERIALCOPPER ALLOY RACE INSERT
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-C-530 FED SPEC SINGLE MATERIAL RESPONSE INNER MEMBER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
55951AInterchangeable
interchangeable cross-reference
interchangeable
SM-B-187269Interchangeable
interchangeable cross-reference
interchangeable
55951Interchangeable
interchangeable cross-reference
interchangeable
CFR40952Interchangeable
interchangeable cross-reference
interchangeable
XH-2542Interchangeable
interchangeable cross-reference
interchangeable
MS51011-10Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is P21770?
P21770 is a BEARING,PLAIN,SELF-ALIGNING.
What parts can replace P21770?
There are 9 known substitutes for P21770: 55951A, SM-B-187269, 55951 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for P21770?
P21770 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-01-188-7700. 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