PartsTable
Technical Data Sheet
Download PDF

98-78-5 — CYLINDER ASSEMBLY,HYDRAULIC BRAK

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

98-78-5: CYLINDER ASSEMBLY,HYDRAULIC BRAK.

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 U.S.

Government catalog 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
NIINs: 002783397, 011231561, 011234135, 015366523
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
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
SUBSTITUTES & CROSS-REFERENCES 8
94S25Reference document
Same NSN cross-reference
Reference document — Secondary reference
18628Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
CT91-1Reference document
Same NSN cross-reference
Reference document — Secondary reference
467-DReference document
Same NSN cross-reference
Reference document — Secondary reference
48X23Reference document
Same NSN cross-reference
Reference document — Secondary reference
103883Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
Ready to buy 98-78-5?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
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 8 known substitutes for 98-78-5: 94S25, 18628, CT91-1 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 98-78-5?
98-78-5 is cataloged in the U.S. Government catalog under NSN 4730-00-278-3397. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 98-78-5

✓ 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.