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105991A ✓ 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 TELEGRAPH REPEATER SUBASSEMBLY is a the manufacturer industrial component. Key specifications include base_style: MIDGET GROOVED, bulb_style: T (TUBULAR), overall_length: 0.625 INCHES MAXIMUM IN, voltage_rating: 10.000 VOLTS NOMINAL, bulb_designator: T-1 3/4, rated_average_life: HOURS. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-329-1921, 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
105991A
NSN: 4730-00-329-1921
FSC: 4730
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
base_styleMIDGET GROOVED
bulb_styleT (TUBULAR)
overall_length0.625 INCHES MAXIMUM IN
voltage_rating10.000 VOLTS NOMINAL
bulb_designatorT-1 3/4
rated_average_lifeHOURS
light_center_length0.375 INCHES NOMINAL IN
light_output_rating0.006 SPHERICAL CANDLEPOWER NOMINAL SINGLE RATING
filament_designationC-2F
specification/standard_data08108-709 MANUFACTURERS STANDARD
average_life_rating_in_hours10000.0
emitted_light_characteristicWHITE
NSN4730-00-329-1921
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 105991A · 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
LT2-65Interchangeable
interchangeable cross-reference
interchangeable
PA43716AInterchangeable
interchangeable cross-reference
interchangeable
56994Interchangeable
interchangeable cross-reference
interchangeable
6189-132-603REDInterchangeable
interchangeable cross-reference
interchangeable
249-7868-3331-504Interchangeable
interchangeable cross-reference
interchangeable
41-201Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 105991A?
105991A is a TELEGRAPH REPEATER SUBASSEMBLY.
What parts can replace 105991A?
There are 27 known substitutes for 105991A: LT2-65, PA43716A, 56994 and 24 more. Substitute compatibility should be verified for your specific system.
Is 105991A still available?
105991A 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