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Technical Data Sheet
PartsTable / COMPONENT / 309-3-8
309-3-8 ✓ 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,PAPER DIELECTRIC. Key specifications include material: STEEL COMP 316 OVERALL, nut_style: HEXAGON, nut_height: 1.000 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-254-6228, 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
309-3-8
NSN: 4730-00-254-6228
FSC: 4730
CAGE: 90480 — KENNECOTT CORP CHASE BRASS GROUP CLEVELAND MILL DIV (USA)
SPECIFICATIONS
materialSTEEL COMP 316 OVERALL
nut_styleHEXAGON
nut_height1.000 INCHES NOMINAL IN
thread_class3B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
nominal_thread_size1.750 INCHES IN
thread_quantity_per_inch5
NSN4730-00-254-6228
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 309-3-8 · 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 29
B3117Interchangeable
interchangeable cross-reference
interchangeable
709-6Interchangeable
interchangeable cross-reference
interchangeable
13257Interchangeable
interchangeable cross-reference
interchangeable
1325794Interchangeable
interchangeable cross-reference
interchangeable
4010PL1400918Interchangeable
interchangeable cross-reference
interchangeable
3429Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 309-3-8?
309-3-8 is a CAPACITOR,FIXED,PAPER DIELECTRIC.
What parts can replace 309-3-8?
There are 29 known substitutes for 309-3-8: B3117, 709-6, 13257 and 26 more. Substitute compatibility should be verified for your specific system.
Is 309-3-8 still available?
309-3-8 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