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H81 — HEATER,DUCT TYPE,PORTABLE

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

H81: HEATER,DUCT TYPE,PORTABLE.

The HEATER,DUCT TYPE,PORTABLE is a the manufacturer industrial component. Key specifications include material: OIL LUBRICATING LUBRICATION, body_width: 1.625 INCHES NOMINAL IN, body_height: 2.375 INCHES NOMINAL IN, body_length: 1.625 INCHES NOMINAL IN, inclosure_type: HERMETICALLY SEALED, overall_length: 2.0000 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-354-3729, 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
MRO→ MRO_GENERAL→ H81
NSN: 3120-00-354-3729
NIINs: 003543729, 004915719, 006174138, 010099021, 012534865, 014530530, 014873716
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 53496 — SCHRAMM, INC. (USA)
SPECIFICATIONS
materialOIL LUBRICATING LUBRICATION
body_width1.625 INCHES NOMINAL IN
body_height2.375 INCHES NOMINAL IN
body_length1.625 INCHES NOMINAL IN
inclosure_typeHERMETICALLY SEALED
overall_length2.0000 INCHES NOMINAL IN
mounting_methodTHREADED STUD(S) SINGLE GROUP
frequency_rating60.0 HERTZ NOMINAL SINGLE COMPONENT
special_featuresLIGHT USED ON THE HANDLAMP P/N SB8; 6V 8W SEALED BEAM V
style_designatorHALF SLEEVE, EXTERNAL FLANGES BOTH ENDS
left_flange_width0.1525 INCHES NOMINAL IN
heat_delivery_rate120000.0 BRITISH THERMAL UNIT
NSN3120-00-354-3729
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: H81 · 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
•
RIGHT FLANGE WIDTH: 0.1525 INCHES NOMINAL IN
•
BODY OUTSIDE DIAMETER: 2.0615 INCHES MINIMUM AND 2.0625 INCHES MAXIMUM IN
•
HOLE SPACING ANGLE: 60.0 DEGREES NOMINAL
•
STYLE DESIGNATOR: HALF SLEEVE, EXTERNAL FLANGES BOTH ENDS
•
BODY INSIDE DIAMETER: 1.7450 INCHES MINIMUM AND 1.7460 INCHES MAXIMUM IN
•
RIGHT FLANGE OUTSIDE DIAMETER: 2.2500 INCHES NOMINAL IN
•
LEFT FLANGE OUTSIDE DIAMETER: 2.2500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
RIGHT FLANGE WIDTH0.1525 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER2.0615 INCHES MINIMUM AND 2.0625 INCHES MAXIMUM IN
HOLE SPACING ANGLE60.0 DEGREES NOMINAL
STYLE DESIGNATORHALF SLEEVE, EXTERNAL FLANGES BOTH ENDS
OVERALL LENGTH2.0000 INCHES NOMINAL IN
BODY INSIDE DIAMETER1.7450 INCHES MINIMUM AND 1.7460 INCHES MAXIMUM IN
RIGHT FLANGE OUTSIDE DIAMETER2.2500 INCHES NOMINAL IN
LEFT FLANGE OUTSIDE DIAMETER2.2500 INCHES NOMINAL IN
LEFT FLANGE WIDTH0.1525 INCHES NOMINAL IN
ANTIROTATION/LUBRICATION TYPE AND QUANTITY3 HOLE
SUBSTITUTES & CROSS-REFERENCES 2
H81ZASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
H81ZBReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is H81?
H81 is a HEATER,DUCT TYPE,PORTABLE. It is classified as a MRO (MRO_GENERAL).
What parts can replace H81?
There are 2 known substitutes for H81: H81ZA, H81ZB. Substitute compatibility should be verified for your specific system.
What is the NSN for H81?
H81 is cataloged in the U.S. Government catalog under NSN 3120-00-354-3729. 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.