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Technical Data Sheet
PartsTable / COMPONENT / MD3-627DD
MD3-627DD ✓ 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,GLASS DIELECTRIC. Key specifications include material: IRON OVERALL, body_type: SOLID, head_type: SOLID, drive_end_style: RECESSED HEXAGON, connection_style: PLAIN, thread_direction: RIGHT-HAND EXTERNAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-555-8291, 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
MD3-627DD
NSN: 4730-00-555-8291
FSC: 4730
CAGE: 97384 — TEXTRON SYSTEMS CORPORATION DBA TEXTRON SYSTEMS CORP (USA)
SPECIFICATIONS
materialIRON OVERALL
body_typeSOLID
head_typeSOLID
drive_end_styleRECESSED HEXAGON
connection_stylePLAIN
thread_directionRIGHT-HAND EXTERNAL
surface_treatmentZINC OVERALL
operating_pressure150.000 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
nominal_thread_size0.750 INCHES EXTERNAL IN
thread_series_designatorNPT EXTERNAL
nondefinitive_spec/std_data2 TYPE AND C STYLE
material_document_and_classificationQQ-I-666,GR 1 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4730-00-555-8291
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MD3-627DD · 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
•
MATERIAL: IRON OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-Z-17871 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SURFACE TREATMENT: ZINC OVERALL
•
OPERATING PRESSURE: 150.000 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
•
THREAD SERIES DESIGNATOR: NPT EXTERNAL
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND C STYLE
•
NOMINAL THREAD SIZE: 0.750 INCHES EXTERNAL IN
•
NOMINAL PIPE SIZE FOR WHICH DESIGNED: 0.750 INCHES 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)
MATERIALIRON OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-Z-17871 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTZINC OVERALL
OPERATING PRESSURE150.000 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
THREAD SERIES DESIGNATORNPT EXTERNAL
NONDEFINITIVE SPEC/STD DATA2 TYPE AND C STYLE
NOMINAL THREAD SIZE0.750 INCHES EXTERNAL IN
NOMINAL PIPE SIZE FOR WHICH DESIGNED0.750 INCHES IN
CONNECTION STYLEPLAIN
BODY TYPESOLID
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
92A23-49Interchangeable
interchangeable cross-reference
interchangeable
92A23/49-120Interchangeable
interchangeable cross-reference
interchangeable
221-845Interchangeable
interchangeable cross-reference
interchangeable
WWP471Interchangeable
interchangeable cross-reference
interchangeable
273469Interchangeable
interchangeable cross-reference
interchangeable
10086134Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MD3-627DD?
MD3-627DD is a CAPACITOR,FIXED,GLASS DIELECTRIC.
What parts can replace MD3-627DD?
There are 20 known substitutes for MD3-627DD: 92A23-49, 92A23/49-120, 221-845 and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MD3-627DD?
MD3-627DD is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-555-8291. 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