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H285 — REACTOR

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

H285: REACTOR.

The REACTOR is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: DOUBLE HEXAGON, body_length: 0.875 INCHES MAXIMUM IN, temp_rating: 450.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, overall_width: 0.125 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-138-0254, 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
H285
NSN: 5340-00-138-0254
NIINs: 001380254, 009165065, 013601489
FSC: 5340 — Hardware, Commercial
CAGE: 80294 — BOURNS INSTRUMENTS INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleDOUBLE HEXAGON
body_length0.875 INCHES MAXIMUM IN
temp_rating450.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
hole_quantity2
overall_width0.125 INCHES NOMINAL IN
rating_methodELECTRICAL SINGLE COMPONENT SINGLE WINDING
thread_seriesUNF
inclosure_typeFULLY INCLOSED
overall_height0.280 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN
overall_length0.544 INCHES NOMINAL IN
NSN5340-00-138-0254
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: H285 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE
•
STYLE DESIGNATOR: RECTANGULAR
•
MOUNTING HOLE DIAMETER: 0.068 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.020 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE
•
MATERIAL: STEEL COMP 302
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE
STYLE DESIGNATORRECTANGULAR
MOUNTING HOLE DIAMETER0.068 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
OVERALL LENGTH0.544 INCHES NOMINAL IN
OVERALL WIDTH0.125 INCHES NOMINAL IN
MATERIAL THICKNESS0.020 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE
MATERIALSTEEL COMP 302
HOLE QUANTITY2
SUBSTITUTES & CROSS-REFERENCES 3
H-28Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
11200223-1Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
0N501188Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is H285?
H285 is a REACTOR.
What parts can replace H285?
There are 3 known substitutes for H285: H-28, 11200223-1, 0N501188. Substitute compatibility should be verified for your specific system.
What is the NSN for H285?
H285 is cataloged in the U.S. Government catalog under NSN 5340-00-138-0254. 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.