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H-556 — BEARING,SLEEVE

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

H-556: BEARING,SLEEVE.

The BEARING,SLEEVE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.318 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN, shank_type: THREADED, design_type: SINGLE FOOT, lubrication: DRY FILM LUBRICANT. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-126-5437, 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
H-556
NSN: 3120-00-126-5437
NIINs: 001265437, 008574948, 016888993
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 16712 — SIEMENS ENERGY, INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.318 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN
shank_typeTHREADED
design_typeSINGLE FOOT
lubricationDRY FILM LUBRICANT
temp_rating450.0 FAHRENHEIT NOMINAL DEGF
corner_shapeSQUARE INSIDE LEFT CORNER
flange_width0.4960 INCHES MINIMUM AND 0.4980 INCHES MAXIMUM IN
holding_clipNOT INCLUDED
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
NSN3120-00-126-5437
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: H-556 · 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
•
SURFACE FINISH: 125.0 MICROINCHES OVERALL
•
CORNER SHAPE: SQUARE INSIDE RIGHT CORNER
•
FLANGE OUTSIDE DIAMETER: 3.6250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH125.0 MICROINCHES OVERALL
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 DIAMETER3.6250 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER3.2430 INCHES MINIMUM AND 3.2450 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, EXTERNAL FLANGE ONE END
SUBSTITUTES & CROSS-REFERENCES 10
G10075PC35Reference document
Same NSN cross-reference
Reference document — Secondary reference
G7042PC49Reference document
Same NSN cross-reference
Reference document — Secondary reference
G8721PC35Reference document
Same NSN cross-reference
Reference document — Secondary reference
G14673PC36Reference document
Same NSN cross-reference
Reference document — Secondary reference
G8097PC35Reference document
Same NSN cross-reference
Reference document — Secondary reference
G14671PC36Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is H-556?
H-556 is a BEARING,SLEEVE.
What parts can replace H-556?
There are 10 known substitutes for H-556: G10075PC35, G7042PC49, G8721PC35 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for H-556?
H-556 is cataloged in the U.S. Government catalog under NSN 3120-00-126-5437. 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.