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8451B — ADAPTER,CONNECTOR

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

8451B: ADAPTER,CONNECTOR.

The ADAPTER,CONNECTOR is a the manufacturer industrial component. Key specifications include body_style: STRAIGHT SHAPE, INTERNAL COUPLING, shell_type: SOLID, thread_class: 2B, shell_material: METAL, contact_material: METAL ALL MATING ENDS SINGLE CONTACT GROUPING, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-321-9825, 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
8451B
NSN: 4730-01-321-9825
NIINs: 013219825, 013426657
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 0AT62 — SIEMENS ENERGY, INC. DBA DRESSER-RAND (USA)
SPECIFICATIONS
body_styleSTRAIGHT SHAPE, INTERNAL COUPLING
shell_typeSOLID
thread_class2B
shell_materialMETAL
contact_materialMETAL ALL MATING ENDS SINGLE CONTACT GROUPING
thread_directionRIGHT-HAND
mating_end_quantity2
nominal_thread_size0.688 INCHES IN
contact_removabilityNONREMOVABLE ALL MATING ENDS SINGLE CONTACT GROUPING
threaded_device_typeCOUPLING FACILITY
included_contact_typeCOAXIAL PIN ALL MATING ENDS SINGLE CONTACT GROUPING
end_item_identificationTEST SET,COUNTERMEASURES SET
NSN4730-01-321-9825
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 8451B · 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
SUBSTITUTES & CROSS-REFERENCES 3
299997EReference document
Same NSN cross-reference
Reference document — Secondary reference
PL-200138F ITEM 717Reference document
Same NSN cross-reference
Reference document — Secondary reference
HB15-4-4-4-5531Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 8451B?
8451B is a ADAPTER,CONNECTOR.
What parts can replace 8451B?
There are 3 known substitutes for 8451B: 299997E, PL-200138F ITEM 717, HB15-4-4-4-5531. Substitute compatibility should be verified for your specific system.
What is the NSN for 8451B?
8451B is cataloged in the U.S. Government catalog under NSN 4730-01-321-9825. 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.