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1644A ✓ 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

CAPACITOR,VARIABLE,AIR DIELECTRI. Key specifications include material: STEEL, construction: ONE-PIECE, hole_diameter: 0.406 INCHES NOMINAL IN, overall_width: 4.000 INCHES NOMINAL IN, style_designator: NON-CIRCULAR W/APERTURE, aperture_diameter: 2.531 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-203-6406, 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
1644A
NSN: 4730-00-203-6406
FSC: 4730
CAGE: 78500 — MERITOR HEAVY VEHICLE SYSTEMS, LLC (USA)
SPECIFICATIONS
materialSTEEL
constructionONE-PIECE
hole_diameter0.406 INCHES NOMINAL IN
overall_width4.000 INCHES NOMINAL IN
style_designatorNON-CIRCULAR W/APERTURE
aperture_diameter2.531 INCHES NOMINAL IN
bolt_hole_quantity4
bolt_circle_diameter3.250 INCHES NOMINAL IN
outside_corner_radius0.375 INCHES NOMINAL IN
outside_corner_inverted_radius0.375 INCHES NOMINAL IN
side_radius_from_gasket_center1.625 INCHES NOMINAL IN
NSN4730-00-203-6406
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1644A · 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
TYPICAL APPLICATIONS
  • RAID cache protection during power loss events
  • Write-back cache enablement for storage controllers
  • Enterprise server data integrity assurance
  • Hot-swap battery/capacitor replacement in production
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
5310-032-1959Interchangeable
interchangeable cross-reference
interchangeable
2-194Interchangeable
interchangeable cross-reference
interchangeable
77-0923-6PC23Interchangeable
interchangeable cross-reference
interchangeable
K837884-3Interchangeable
interchangeable cross-reference
interchangeable
1644Interchangeable
interchangeable cross-reference
interchangeable
9743-B-0632-37Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1644A?
1644A is a CAPACITOR,VARIABLE,AIR DIELECTRI.
What parts can replace 1644A?
There are 22 known substitutes for 1644A: 5310-032-1959, 2-194, 77-0923-6PC23 and 19 more. Substitute compatibility should be verified for your specific system.
Is 1644A still available?
1644A 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