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Technical Data Sheet
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S1990 ✓ 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 COVER,ACTUATOR is a the manufacturer industrial component. Key specifications include phase: THREE INPUT, shape: STRAIGHT, length: 1.250 INCHES NOMINAL IN, capacity: 6.0 OUNCES OZ, diameter: 0.250 INCHES NOMINAL IN, material: PLASTIC NYLON. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-595-3108, 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
S1990
NSN: 4730-00-595-3108
FSC: 4730
CAGE: 50019 — READY POWER CO THE (USA)
SPECIFICATIONS
phaseTHREE INPUT
shapeSTRAIGHT
length1.250 INCHES NOMINAL IN
capacity6.0 OUNCES OZ
diameter0.250 INCHES NOMINAL IN
materialPLASTIC NYLON
tip_typeREMOVABLE
cone_width1.2160 INCHES NOMINAL IN
duty_cycleCONTINUOUS
flat_depth0.0300 INCHES NOMINAL SINGLE END IN
shaft_typeROUND SINGLE ACTUATOR
temp_rating-54.0 OPERATING CELSIUS AND 77.0 OPERATING CELSIUS
NSN4730-00-595-3108
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: S1990 · 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 18
3325X6Interchangeable
interchangeable cross-reference
interchangeable
4730PL1800704Interchangeable
interchangeable cross-reference
interchangeable
SAE J530 6-6 130137Interchangeable
interchangeable cross-reference
interchangeable
140486HInterchangeable
interchangeable cross-reference
interchangeable
2246550Interchangeable
interchangeable cross-reference
interchangeable
647PInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S1990?
S1990 is a COVER,ACTUATOR.
What parts can replace S1990?
There are 18 known substitutes for S1990: 3325X6, 4730PL1800704, SAE J530 6-6 130137 and 15 more. Substitute compatibility should be verified for your specific system.
Is S1990 still available?
S1990 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