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PartsTable / COMPONENT / 51557
51557 ✓ 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 MICROCIRCUIT,LINEAR is a the manufacturer industrial component. Key specifications include material: GLASS PROTECTIVE CRYSTAL, dial_size: 2 IN. DIA IN, thickness: 0.015 INCHES NOMINAL IN, body_width: 1.050 INCHES MAXIMUM IN, scale_name: PRESSURE-VACUUM, scale_type: SINGLE.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-356-3499, 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
51557
NSN: 3120-00-356-3499
FSC: 3120
CAGE: 82423 — KLEINSCHMIDT INC (USA)
SPECIFICATIONS
materialGLASS PROTECTIVE CRYSTAL
dial_size2 IN. DIA IN
thickness0.015 INCHES NOMINAL IN
body_width1.050 INCHES MAXIMUM IN
scale_namePRESSURE-VACUUM
scale_typeSINGLE
body_height0.250 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN
body_length1.573 INCHES MAXIMUM IN
scale_range+0.0 TO 30.0 INCHES AND +0.0 TO 30.0 POUNDS PRESSURE PER SQUARE INCH LBS
corner_shapeSQUARE ALL CORNERS
flange_width0.1178 INCHES NOMINAL IN
pointer_typeINDICATING
NSN3120-00-356-3499
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 51557 · 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
•
SURFACE FINISH: 63.0 MICROINCHES RIGHT END SURFACE OF BODY
•
MATERIAL: COPPER ALLOY 642 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
CORNER SHAPESQUARE ALL CORNERS
SURFACE FINISH63.0 MICROINCHES RIGHT END SURFACE OF BODY
SURFACE FINISH32.0 MICROINCHES INSIDE DIAMETER SURFACE OF BODY
SURFACE FINISH63.0 MICROINCHES RIGHT END SURFACE OF LEFT FLANGE
SURFACE FINISH63.0 MICROINCHES LEFT END SURFACE OF BODY AND FLANGE
SURFACE FINISH63.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF FLANGE
SURFACE FINISH63.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY
MATERIALCOPPER ALLOY 642 OVERALL
STYLE DESIGNATORHEXAGON SHAPED FLANGE, EXTERNAL FLANGE ONE END
MATERIAL DOCUMENT AND CLASSIFICATIONASTM B150 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
AA51154A-1B9BInterchangeable
interchangeable cross-reference
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G24Interchangeable
interchangeable cross-reference
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11516-RInterchangeable
interchangeable cross-reference
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49716Interchangeable
interchangeable cross-reference
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C08746Interchangeable
interchangeable cross-reference
interchangeable
408Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 51557?
51557 is a MICROCIRCUIT,LINEAR.
What parts can replace 51557?
There are 22 known substitutes for 51557: AA51154A-1B9B, G24, 11516-R and 19 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 51557?
51557 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-356-3499. 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