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Technical Data Sheet
PartsTable / COMPONENT / 1648B1
1648B1 ✓ 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,FIXED,PLASTIC DIELECTR. Key specifications include angle: 65.0 DEGREES, height: 0.796 INCHES NOMINAL IN, material: STEEL OVERALL, shank_length: 0.219 INCHES NOMINAL IN, thread_class: 2A A, special_features: SURFACE LOCATED BALL CHECK VALVE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-391-3753, 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
1648B1
NSN: 4730-00-391-3753
FSC: 4730
CAGE: 57733 — STEWART-WARNER CORPORATION (USA)
SPECIFICATIONS
angle65.0 DEGREES
height0.796 INCHES NOMINAL IN
materialSTEEL OVERALL
shank_length0.219 INCHES NOMINAL IN
thread_class2A A
special_featuresSURFACE LOCATED BALL CHECK VALVE
style_designatorANGLE
surface_treatmentPASSIVATE OVERALL
width_across_flats0.375 INCHES NOMINAL IN
nominal_thread_size0.312 INCHES IN
thread_quantity_per_inch32
assembly_clearance_radius0.531 INCHES NOMINAL IN
NSN4730-00-391-3753
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1648B1 · 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
KEY FEATURES
•
SHANK LENGTH: 0.219 INCHES NOMINAL IN
•
THREAD CLASS: 2A A
•
HEIGHT: 0.796 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 32
•
ASSEMBLY CLEARANCE RADIUS: 0.531 INCHES NOMINAL IN
•
SCREW THREAD SERIES DESIGNATOR: UNEF
•
WIDTH ACROSS FLATS: 0.375 INCHES NOMINAL IN
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)
SHANK LENGTH0.219 INCHES NOMINAL IN
THREAD CLASS2A A
SPECIAL FEATURESSURFACE LOCATED BALL CHECK VALVE
HEIGHT0.796 INCHES NOMINAL IN
THREAD QUANTITY PER INCH32
ASSEMBLY CLEARANCE RADIUS0.531 INCHES NOMINAL IN
SCREW THREAD SERIES DESIGNATORUNEF
WIDTH ACROSS FLATS0.375 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.312 INCHES IN
ANGLE65.0 DEGREES
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
T1451Interchangeable
interchangeable cross-reference
interchangeable
219760Interchangeable
interchangeable cross-reference
interchangeable
219755Interchangeable
interchangeable cross-reference
interchangeable
10607Interchangeable
interchangeable cross-reference
interchangeable
1648Interchangeable
interchangeable cross-reference
interchangeable
RC340-16-1686PC1648SInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1648B1?
1648B1 is a CAPACITOR,FIXED,PLASTIC DIELECTR.
What parts can replace 1648B1?
There are 20 known substitutes for 1648B1: T1451, 219760, 219755 and 17 more. Substitute compatibility should be verified for your specific system.
Is 1648B1 still available?
1648B1 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