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Technical Data Sheet
PartsTable / COMPONENT / 98-78-5
98-78-5 ✓ 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

CYLINDER ASSEMBLY,HYDRAULIC BRAK. Key specifications include material: COPPER ALLOY 922 BODY, valve_size: 0.750 INCHES IN, flow_control_device: DIAPHRAGM AND STEM AND INTEGRAL DISK, end_item_identification: VALVE RELIEF .75IPS 2T3PSI FLANGE BRONZE, nondefinitive_spec/std_data: 3/4" CDHS-20M MODEL, material_document_and_classification: UNABLE TO DECODE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-3397, 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
98-78-5
NSN: 4730-00-278-3397
FSC: 4730
CAGE: 95019 — DANA CORP SPICER TRANSMISSION DIV (USA)
SPECIFICATIONS
materialCOPPER ALLOY 922 BODY
valve_size0.750 INCHES IN
flow_control_deviceDIAPHRAGM AND STEM AND INTEGRAL DISK
end_item_identificationVALVE RELIEF .75IPS 2T3PSI FLANGE BRONZE
nondefinitive_spec/std_data3/4" CDHS-20M MODEL
material_document_and_classificationUNABLE TO DECODE
part_name_assigned_by_controlling_agency3/4" CDHS-20M PRESURE DIFFERENTIAL RELIEF VALVE (SEAWATER SERVICE)
NSN4730-00-278-3397
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 98-78-5 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
203064Interchangeable
interchangeable cross-reference
interchangeable
075520Interchangeable
interchangeable cross-reference
interchangeable
311-90090Interchangeable
interchangeable cross-reference
interchangeable
4710000174647Interchangeable
interchangeable cross-reference
interchangeable
103883Interchangeable
interchangeable cross-reference
interchangeable
02744Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 98-78-5?
98-78-5 is a CYLINDER ASSEMBLY,HYDRAULIC BRAK.
What parts can replace 98-78-5?
There are 27 known substitutes for 98-78-5: 203064, 075520, 311-90090 and 24 more. Substitute compatibility should be verified for your specific system.
Is 98-78-5 still available?
98-78-5 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026