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1644 — CAPACITOR,VARIABLE,AIR DIELECTRI

✓ Government record, cited
Giochi Preziosi · MRO · MRO_GENERAL
PRODUCT OVERVIEW

1644: CAPACITOR,VARIABLE,AIR DIELECTRI.

CAPACITOR,VARIABLE,AIR DIELECTRI. Key specifications include filter: NOT INCLUDED, length: 1.250 INCHES NOMINAL IN, adapter: NOT INCLUDED, diameter: 1.438 INCHES NOMINAL IN, material: STEEL CORROSION RESISTING, flow_type: TWO-WAY. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-185-0375, 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
MRO→ MRO_GENERAL→ 1644
NSN: 5340-00-185-0375
NIINs: 001850375, 001958200, 002004174, 002036406, 002046842, 002514483, 004316747, 005823388, 006740398, 007888670, 008593798, 009507092, 009686702, 011143379, 012589733, 014107984, 014978798, 014998145, 015701488
FSC: 5340 — Hardware, Commercial
CAGE: 91833 — KEYSTONE ELECTRONICS CORP (USA)
SPECIFICATIONS
filterNOT INCLUDED
length1.250 INCHES NOMINAL IN
adapterNOT INCLUDED
diameter1.438 INCHES NOMINAL IN
materialSTEEL CORROSION RESISTING
flow_typeTWO-WAY
body_styleW/O MTG FACILITIES, AXIAL TERMINALS
head_styleFLAT
seat_angle45.0 DEGREES NOMINAL
shaft_typeROUND SINGLE SHAFT
shell_typeSOLID
spray_typeHOLLOW
NSN5340-00-185-0375
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1644 MFR: Giochi Preziosi ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
FLANGE WIDTH ACROSS FLATS: 0.250 INCHES NOMINAL IN
•
LENGTH: 1.250 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416 TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE STANDOFF
•
FLANGE THICKNESS: 1.000 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FLANGED WITH LEFT INTERNAL THREAD
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-626 FED SPEC SINGLE MATERIAL RESPONSE STANDOFF
•
THREAD DIRECTION: RIGHT-HAND RIGHT EXTERNAL
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
TECHNICAL CHARACTERISTICS
FLANGE WIDTH ACROSS FLATS0.250 INCHES NOMINAL IN
LENGTH1.250 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE STANDOFF
FLANGE THICKNESS1.000 INCHES NOMINAL IN
STYLE DESIGNATORFLANGED WITH LEFT INTERNAL THREAD
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-626 FED SPEC SINGLE MATERIAL RESPONSE STANDOFF
THREAD DIRECTIONRIGHT-HAND RIGHT EXTERNAL
THREAD DIRECTIONRIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD)
NOMINAL THREAD SIZE0.138 INCHES RIGHT EXTERNAL IN
NOMINAL THREAD SIZE0.138 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN
SUBSTITUTES & CROSS-REFERENCES 6
9743-B-0632-37Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
8254Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
9743B0632-3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
990B056254-3Reference document
Same NSN cross-reference
Reference document — Secondary reference
05625Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
129-1006-00Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1644?
1644 is a CAPACITOR,VARIABLE,AIR DIELECTRI manufactured by Giochi Preziosi. It is classified as a MRO (MRO_GENERAL).
What parts can replace 1644?
There are 6 known substitutes for 1644: 9743-B-0632-37, 8254, 9743B0632-3 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1644?
1644 is cataloged in the U.S. Government catalog under NSN 5340-00-185-0375. This indicates validated use in U.S. government and defense supply chains.
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✓ 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.