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Technical Data Sheet
PartsTable / MRO / A1631
A1631 ✓ 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 material: PLASTIC CASE, body_style: BUSHING MOUNT, body_width: 1.375 INCHES NOMINAL IN, flow_angle: 90.0 DEGREES, leg_length: 2.188 INCHES NOMINAL SECOND END IN, body_length: 1.813 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-053-0258, 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→ A1631
NSN: 4730-00-053-0258
FSC: 4730
CAGE: 41947 — MUELLER BRASS CO. (USA)
SPECIFICATIONS
materialPLASTIC CASE
body_styleBUSHING MOUNT
body_width1.375 INCHES NOMINAL IN
flow_angle90.0 DEGREES
leg_length2.188 INCHES NOMINAL SECOND END IN
body_length1.813 INCHES NOMINAL IN
body_diameter0.688 INCHES NOMINAL IN
overall_width1.375 INCHES NOMINAL IN
actuator_styleROUND
bushing_length0.469 INCHES NOMINAL IN
inclosure_typeFULLY INCLOSED
overall_height2.329 INCHES NOMINAL IN
NSN4730-00-053-0258
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A1631 · 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
•
THREAD SERIES DESIGNATOR: NPT SECOND END
•
NOMINAL THREAD SIZE: 1.500 INCHES SECOND END IN
•
MATERIAL: COPPER ALLOY OVERALL
•
FLOW ANGLE: 90.0 DEGREES
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 1.500 INCHES FIRST END IN
•
CONNECTION STYLE: PLAIN (PIPE) SECOND END
•
NOMINAL PIPE SIZE ACCOMMODATED: 1.500 INCHES SECOND END IN
•
LEG LENGTH: 2.188 INCHES NOMINAL SECOND END 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)
THREAD SERIES DESIGNATORNPT SECOND END
NOMINAL THREAD SIZE1.500 INCHES SECOND END IN
MATERIALCOPPER ALLOY OVERALL
FLOW ANGLE90.0 DEGREES
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED1.500 INCHES FIRST END IN
CONNECTION STYLEPLAIN (PIPE) SECOND END
NOMINAL PIPE SIZE ACCOMMODATED1.500 INCHES SECOND END IN
LEG LENGTH2.188 INCHES NOMINAL SECOND END IN
LEG LENGTH1.688 INCHES NOMINAL FIRST END IN
CONNECTION STYLESOCKET (TUBE) FIRST END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
M15Interchangeable
interchangeable cross-reference
interchangeable
P10362Interchangeable
interchangeable cross-reference
interchangeable
ALC116Interchangeable
interchangeable cross-reference
interchangeable
AS4283Interchangeable
interchangeable cross-reference
interchangeable
10-935Interchangeable
interchangeable cross-reference
interchangeable
B107.10Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A1631?
A1631 is a CAPACITOR,FIXED,PAPER DIELECTRIC. It is classified as a MRO (MRO_GENERAL).
What parts can replace A1631?
There are 20 known substitutes for A1631: M15, P10362, ALC116 and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A1631?
A1631 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-053-0258. 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