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Technical Data Sheet
PartsTable / COMPONENT / CT91-1
CT91-1 ✓ 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 body_width: 0.951 INCHES MAXIMUM IN, body_height: 0.200 INCHES MAXIMUM IN, body_length: 1.155 INCHES MAXIMUM IN, overall_height: 0.335 INCHES NOMINAL IN, inclosure_material: METAL, operating_temp_range: -55.0 TO 125.0 CELSIUS DEGC. 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
CT91-1
NSN: 4730-00-278-3397
FSC: 4730
CAGE: 79960 — ZENITH FUEL SYSTEMS LLC (USA)
SPECIFICATIONS
body_width0.951 INCHES MAXIMUM IN
body_height0.200 INCHES MAXIMUM IN
body_length1.155 INCHES MAXIMUM IN
overall_height0.335 INCHES NOMINAL IN
inclosure_materialMETAL
operating_temp_range-55.0 TO 125.0 CELSIUS DEGC
input_circuit_pattern2 INPUT
inclosure_configurationFLAT PACK
terminal_surface_treatmentGOLD
design_function_and_quantity2 AMPLIFIER, DETECTOR
case_outline_source_and_designator/10107 MIL-M-38510
NSN4730-00-278-3397
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: CT91-1 · 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 CT91-1?
CT91-1 is a CYLINDER ASSEMBLY,HYDRAULIC BRAK.
What parts can replace CT91-1?
There are 27 known substitutes for CT91-1: 203064, 075520, 311-90090 and 24 more. Substitute compatibility should be verified for your specific system.
Is CT91-1 still available?
CT91-1 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