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4HB851 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The NIPPLE,PIPE is a the manufacturer industrial component. Key specifications include special_features: NATIONAL PIPE THREADS, end_item_identification: 3990-01-444-6174 BITUM DISTRIBUTOR, part_name_assigned_by_controlling_agency: PIPE NIPPLE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-541-0194, 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
4HB851
NSN: 4730-01-541-0194
FSC: 4730
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
special_featuresNATIONAL PIPE THREADS
end_item_identification3990-01-444-6174 BITUM DISTRIBUTOR
part_name_assigned_by_controlling_agencyPIPE NIPPLE
NSN4730-01-541-0194
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4HB851 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
TECHNICAL CHARACTERISTICS (FLIS)
END ITEM IDENTIFICATION3990-01-444-6174 BITUM DISTRIBUTOR
SPECIAL FEATURESNATIONAL PIPE THREADS
PART NAME ASSIGNED BY CONTROLLING AGENCYPIPE NIPPLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
P99Interchangeable
interchangeable cross-reference
interchangeable
10299Interchangeable
interchangeable cross-reference
interchangeable
C7TZ6731BInterchangeable
interchangeable cross-reference
interchangeable
127874Interchangeable
interchangeable cross-reference
interchangeable
543-0861-002Interchangeable
interchangeable cross-reference
interchangeable
339-1X1-1/2Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4HB851?
4HB851 is a NIPPLE,PIPE.
What parts can replace 4HB851?
There are 6 known substitutes for 4HB851: P99, 10299, C7TZ6731B and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4HB851?
4HB851 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-541-0194. 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