PartsTable
Technical Data Sheet

FF-620-31/64 LG — BEARING,SLEEVE

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

FF-620-31/64 LG: BEARING,SLEEVE.

The BEARING,SLEEVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 841 OVERALL, corner_shape: SQUARE ALL CORNERS, flange_width: 0.0600 INCHES MINIMUM AND 0.0640 INCHES MAXIMUM IN, overall_length: 0.4844 INCHES NOMINAL IN, style_designator: SOLID, EXTERNAL FLANGE ONE END, body_inside_diameter: 0.5010 INCHES MINIMUM AND 0.5020 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-01-446-9957, 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
FF-620-31/64 LG
NSN: 3120-01-446-9957
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 71366 — BUNTING BEARINGS CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY 841 OVERALL
corner_shapeSQUARE ALL CORNERS
flange_width0.0600 INCHES MINIMUM AND 0.0640 INCHES MAXIMUM IN
overall_length0.4844 INCHES NOMINAL IN
style_designatorSOLID, EXTERNAL FLANGE ONE END
body_inside_diameter0.5010 INCHES MINIMUM AND 0.5020 INCHES MAXIMUM IN
body_outside_diameter0.6260 INCHES MINIMUM AND 0.6270 INCHES MAXIMUM IN
flange_outside_diameter0.9875 INCHES NOMINAL IN
material_document_and_classificationMIL-B-5687, TY 1, COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN3120-01-446-9957
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: FF-620-31/64 LG · 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
•
CORNER SHAPE: SQUARE ALL CORNERS
•
FLANGE OUTSIDE DIAMETER: 0.9875 INCHES NOMINAL IN
•
BODY OUTSIDE DIAMETER: 0.6260 INCHES MINIMUM AND 0.6270 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SOLID, EXTERNAL FLANGE ONE END
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-B-5687, TY 1, COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
BODY INSIDE DIAMETER: 0.5010 INCHES MINIMUM AND 0.5020 INCHES MAXIMUM IN
•
FLANGE WIDTH: 0.0600 INCHES MINIMUM AND 0.0640 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
CORNER SHAPESQUARE ALL CORNERS
FLANGE OUTSIDE DIAMETER0.9875 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER0.6260 INCHES MINIMUM AND 0.6270 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, EXTERNAL FLANGE ONE END
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-5687, TY 1, COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OVERALL LENGTH0.4844 INCHES NOMINAL IN
BODY INSIDE DIAMETER0.5010 INCHES MINIMUM AND 0.5020 INCHES MAXIMUM IN
FLANGE WIDTH0.0600 INCHES MINIMUM AND 0.0640 INCHES MAXIMUM IN
MATERIALCOPPER ALLOY 841 OVERALL
OTHER ITEMS IN FSC 3120 — Bearings, Plain, Unmounted
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
3120-00-001-1288 3120-00-001-1835 3120-00-001-1838 3120-00-001-1928 3120-00-001-1934 3120-00-001-3933 3120-00-001-3937 3120-00-001-3938
SUBSTITUTES & CROSS-REFERENCES 3
123-4403549 PIECE 5Reference document
Same NSN cross-reference
Reference document — Secondary reference
123-4403534 PART 11Reference document
Same NSN cross-reference
Reference document — Secondary reference
123-4403533 PART 21Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
Ready to buy FF-620-31/64 LG?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is FF-620-31/64 LG?
FF-620-31/64 LG is a BEARING,SLEEVE.
What parts can replace FF-620-31/64 LG?
There are 3 known substitutes for FF-620-31/64 LG: 123-4403549 PIECE 5, 123-4403534 PART 11, 123-4403533 PART 21. Substitute compatibility should be verified for your specific system.
What is the NSN for FF-620-31/64 LG?
FF-620-31/64 LG is cataloged in the U.S. Government catalog under NSN 3120-01-446-9957. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — FF-620-31/64 LG

✓ 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.