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0B-57 — STRAP,WRIST,ELECTROSTATIC DISCHA

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

0B-57: STRAP,WRIST,ELECTROSTATIC DISCHA.

STRAP,WRIST,ELECTROSTATIC DISCHA. Key specifications include material: OIL LUBRICATING LUBRICATION, corner_shape: SQUARE INSIDE RIGHT CORNER, flange_width: 0.0210 INCHES MINIMUM AND 0.0230 INCHES MAXIMUM IN, overall_length: 0.1180 INCHES MINIMUM AND 0.1251 INCHES MAXIMUM IN, style_designator: SOLID, EXTERNAL FLANGE ONE END, body_inside_diameter: 0.2502 INCHES MINIMUM AND 0.2504 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-980-8830, 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
0B-57
NSN: 3120-00-980-8830
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 23266 — SECS INC (USA)
SPECIFICATIONS
materialOIL LUBRICATING LUBRICATION
corner_shapeSQUARE INSIDE RIGHT CORNER
flange_width0.0210 INCHES MINIMUM AND 0.0230 INCHES MAXIMUM IN
overall_length0.1180 INCHES MINIMUM AND 0.1251 INCHES MAXIMUM IN
style_designatorSOLID, EXTERNAL FLANGE ONE END
body_inside_diameter0.2502 INCHES MINIMUM AND 0.2504 INCHES MAXIMUM IN
body_outside_diameter0.4999 INCHES MINIMUM AND 0.5001 INCHES MAXIMUM IN
flange_outside_diameter0.5420 INCHES MINIMUM AND 0.5520 INCHES MAXIMUM IN
nondefinitive_spec/std_data1 TYPE AND A COMPOSITION
material_document_and_classificationMIL-B-5697,TY 1,COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN3120-00-980-8830
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 0B-57 · 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 INSIDE RIGHT CORNER
•
FLANGE OUTSIDE DIAMETER: 0.5420 INCHES MINIMUM AND 0.5520 INCHES MAXIMUM IN
•
BODY OUTSIDE DIAMETER: 0.4999 INCHES MINIMUM AND 0.5001 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
CORNER SHAPESQUARE INSIDE RIGHT CORNER
CORNER SHAPESQUARE OUTSIDE RIGHT CORNER
CORNER SHAPESQUARE OUTSIDE LEFT CORNER
CORNER SHAPESQUARE LEFT FLANGE OUTSIDE RIGHT CORNER
CORNER SHAPESQUARE INSIDE LEFT CORNER
CORNER SHAPEUNDERCUT LEFT FLANGE BODY CORNER
FLANGE OUTSIDE DIAMETER0.5420 INCHES MINIMUM AND 0.5520 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER0.4999 INCHES MINIMUM AND 0.5001 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, EXTERNAL FLANGE ONE END
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-5697,TY 1,COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
MILB5687Reference document
Same NSN cross-reference
Reference document — Identification 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 0B-57?
0B-57 is a STRAP,WRIST,ELECTROSTATIC DISCHA.
What parts can replace 0B-57?
There is 1 known substitute for 0B-57: MILB5687. Substitute compatibility should be verified for your specific system.
What is the NSN for 0B-57?
0B-57 is cataloged in the U.S. Government catalog under NSN 3120-00-980-8830. 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.