PartsTable
Technical Data Sheet
PartsTable / MRO / S31-17
S31-17 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
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 body_style: W/MTG BRACKET, TERMINAL(S) ON ONE END, head_style: ROUND, body_length: 1.375 INCHES NOMINAL IN, body_diameter: 0.531 INCHES NOMINAL IN, thread_length: 0.500 INCHES NOMINAL IN, fastener_length: 0.500 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-3144, 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→ S31-17
NSN: 4730-00-278-3144
FSC: 4730
CAGE: 80212 — BAE SYSTEMS LAND & ARMAMENTS L.P. (USA)
SPECIFICATIONS
body_styleW/MTG BRACKET, TERMINAL(S) ON ONE END
head_styleROUND
body_length1.375 INCHES NOMINAL IN
body_diameter0.531 INCHES NOMINAL IN
thread_length0.500 INCHES NOMINAL IN
fastener_length0.500 INCHES NOMINAL IN
terminal_length3.344 INCHES NOMINAL IN
thread_directionRIGHT-HAND
terminal_diameter0.110 INCHES NOMINAL IN
reliability_indicatorNOT ESTABLISHED
nominal_thread_diameter0.190 INCHES IN
thread_quantity_per_inch24
NSN4730-00-278-3144
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: S31-17 · 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 30
SAE J514Interchangeable
interchangeable cross-reference
interchangeable
8-6 140140CInterchangeable
interchangeable cross-reference
interchangeable
1/2X3/8PTR-SInterchangeable
interchangeable cross-reference
interchangeable
24SB-20X12Interchangeable
interchangeable cross-reference
interchangeable
7350912Interchangeable
interchangeable cross-reference
interchangeable
T7-0126Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S31-17?
S31-17 is a CAPACITOR,FIXED,PAPER DIELECTRIC. It is classified as a MRO (MRO_GENERAL).
What parts can replace S31-17?
There are 30 known substitutes for S31-17: SAE J514, 8-6 140140C, 1/2X3/8PTR-S and 27 more. Substitute compatibility should be verified for your specific system.
Is S31-17 still available?
S31-17 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