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Technical Data Sheet
PartsTable / MRO / 1644
1644 ✓ Verified by PartsTable
Giochi Preziosi · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

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 product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) 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
FSC: 5340
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
•
THREAD DIRECTION: RIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD)
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-626 FED SPEC SINGLE MATERIAL RESPONSE STANDOFF
•
FLANGE THICKNESS: 1.000 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FLANGED WITH LEFT INTERNAL THREAD
•
THREAD QUANTITY PER INCH: 32 LEFT INTERNAL (INCLUDES THRU THREAD)
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC) 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 (FLIS)
FLANGE WIDTH ACROSS FLATS0.250 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD)
THREAD DIRECTIONRIGHT-HAND RIGHT EXTERNAL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-626 FED SPEC SINGLE MATERIAL RESPONSE STANDOFF
FLANGE THICKNESS1.000 INCHES NOMINAL IN
STYLE DESIGNATORFLANGED WITH LEFT INTERNAL THREAD
THREAD QUANTITY PER INCH32 LEFT INTERNAL (INCLUDES THRU THREAD)
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) RIGHT EXTERNAL
NOMINAL THREAD SIZE0.138 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE STANDOFF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
8254Upgraded Successor
successor cross-reference
successor
POGS33C-COMPUpgraded Successor
successor cross-reference
successor
FEED AIR COMPRESSORUpgraded Successor
successor cross-reference
successor
D15-790VPC642-643Interchangeable
interchangeable cross-reference
interchangeable
D15-494KPC695-696Interchangeable
interchangeable cross-reference
interchangeable
D15-646CPC642-643Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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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 20 known substitutes for 1644: 8254, POGS33C-COMP, FEED AIR COMPRESSOR and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1644?
1644 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-185-0375. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026