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Technical Data Sheet
PartsTable / COMPONENT / 6391K131
6391K131 ✓ 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 FILTER,BAND PASS-LOW PASS is a the manufacturer industrial component. Key specifications include material: OIL LUBRICATING LUBRICATION, corner_shape: SQUARE ALL CORNERS, overall_length: 0.2450 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN, hardness_rating: 30.0 ROCKWELL C MINIMUM AND 70.0 ROCKWELL C MAXIMUM OVERALL, style_designator: SOLID, PLAIN, NO OUTSIDE FLANGES, body_inside_diameter: 0.2500 INCHES MINIMUM AND 0.2510 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-661-5308, 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
6391K131
NSN: 3120-00-661-5308
FSC: 3120
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialOIL LUBRICATING LUBRICATION
corner_shapeSQUARE ALL CORNERS
overall_length0.2450 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN
hardness_rating30.0 ROCKWELL C MINIMUM AND 70.0 ROCKWELL C MAXIMUM OVERALL
style_designatorSOLID, PLAIN, NO OUTSIDE FLANGES
body_inside_diameter0.2500 INCHES MINIMUM AND 0.2510 INCHES MAXIMUM IN
body_outside_diameter0.3760 INCHES MINIMUM AND 0.3770 INCHES MAXIMUM IN
material_document_and_classificationMIL-B-8657,TYPE 1,COMP A MIL SPEC 1ST MATERIAL RESPONSE OR MIL-B-8657,TYPE 1,COMP B MIL SPEC 2ND MATERIAL RESPONSE OVERALL
NSN3120-00-661-5308
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 6391K131 · 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
•
BODY INSIDE DIAMETER: 0.2500 INCHES MINIMUM AND 0.2510 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-B-8657,TYPE 1,COMP A MIL SPEC 1ST MATERIAL RESPONSE OR MIL-B-8657,TYPE 1,COMP B MIL SPEC 2ND MATERIAL RESPONSE OVERALL
•
MATERIAL: COPPER ALLOY OVERALL
•
HARDNESS RATING: 30.0 ROCKWELL C MINIMUM AND 70.0 ROCKWELL C MAXIMUM OVERALL
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
•
CORNER SHAPE: SQUARE ALL CORNERS
TECHNICAL CHARACTERISTICS (FLIS)
BODY INSIDE DIAMETER0.2500 INCHES MINIMUM AND 0.2510 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-8657,TYPE 1,COMP A MIL SPEC 1ST MATERIAL RESPONSE OR MIL-B-8657,TYPE 1,COMP B MIL SPEC 2ND MATERIAL RESPONSE OVERALL
MATERIALCOPPER ALLOY OVERALL
HARDNESS RATING30.0 ROCKWELL C MINIMUM AND 70.0 ROCKWELL C MAXIMUM OVERALL
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
CORNER SHAPESQUARE ALL CORNERS
MATERIALOIL LUBRICATING LUBRICATION
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-L-15016, SYMBOL 2190 MIL SPEC SINGLE MATERIAL RESPONSE LUBRICATION
BODY OUTSIDE DIAMETER0.3760 INCHES MINIMUM AND 0.3770 INCHES MAXIMUM IN
OVERALL LENGTH0.2450 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
DYN26HInterchangeable
interchangeable cross-reference
interchangeable
ET-13-180Interchangeable
interchangeable cross-reference
interchangeable
5508Interchangeable
interchangeable cross-reference
interchangeable
1783947Interchangeable
interchangeable cross-reference
interchangeable
CW12-847Interchangeable
interchangeable cross-reference
interchangeable
SS0-8Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 6391K131?
6391K131 is a FILTER,BAND PASS-LOW PASS.
What parts can replace 6391K131?
There are 25 known substitutes for 6391K131: DYN26H, ET-13-180, 5508 and 22 more. Substitute compatibility should be verified for your specific system.
Is 6391K131 still available?
6391K131 is currently cancelled.
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PartsTable Design LLC · partstable.com
Last verified: July 2026