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Technical Data Sheet
PartsTable / COMPONENT / MS51511B4
MS51511B4 ✓ 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

The BEARING,ROLLER,TAPERED is a the manufacturer tape media or drive component used in enterprise backup, archival, and disaster recovery environments. Key specifications include material: STEEL COMP 12L14 OR STEEL COMP 1010 OVERALL, leg_length: 0.890 INCHES NOMINAL THIRD END IN, seat_angle: 37.0 DEGREES FIRST END, thread_class: 2A THIRD END A, connection_type: THREADED EXTERNAL TUBE THIRD END, connection_style: FLARED (TUBE) FIRST END. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-218-0147, 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
MS51511B4
NSN: 4730-00-218-0147
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 12L14 OR STEEL COMP 1010 OVERALL
leg_length0.890 INCHES NOMINAL THIRD END IN
seat_angle37.0 DEGREES FIRST END
thread_class2A THIRD END A
connection_typeTHREADED EXTERNAL TUBE THIRD END
connection_styleFLARED (TUBE) FIRST END
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.125 INCHES SECOND END IN
media_for_which_designedHYDRAULIC FLUID SINGLE RESPONSE
thread_series_designatorNPTF SECOND END
nondefinitive_spec/std_data5C FIGURE
specification/standard_data96906-MS51511 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NSN4730-00-218-0147
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS51511B4 · 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
•
LEG LENGTH: 0.780 INCHES NOMINAL SECOND END IN
•
CONNECTION TYPE: THREADED EXTERNAL TUBE THIRD END
•
THREAD SERIES DESIGNATOR: NPTF SECOND END
•
MATERIAL: STEEL OVERALL
•
NOMINAL THREAD SIZE: 0.438 INCHES FIRST END IN
TYPICAL APPLICATIONS
  • Long-term data archival and compliance retention
  • Offsite backup and disaster recovery
  • Air-gapped ransomware protection
  • Cold storage tier for infrequently accessed data
TECHNICAL CHARACTERISTICS (FLIS)
LEG LENGTH0.780 INCHES NOMINAL SECOND END IN
CONNECTION TYPETHREADED EXTERNAL TUBE THIRD END
THREAD SERIES DESIGNATORNPTF SECOND END
MATERIALSTEEL OVERALL
NOMINAL THREAD SIZE0.438 INCHES FIRST END IN
NOMINAL THREAD SIZE0.438 INCHES THIRD END IN
LEG LENGTH0.890 INCHES NOMINAL FIRST END IN
THREAD SERIES DESIGNATORUNF THIRD END
SEAT ANGLE37.0 DEGREES THIRD END
CONNECTION TYPETHREADED EXTERNAL PIPE SECOND END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
S9300F921869PC63Interchangeable
interchangeable cross-reference
interchangeable
17554Interchangeable
interchangeable cross-reference
interchangeable
22788Interchangeable
interchangeable cross-reference
interchangeable
202824Interchangeable
interchangeable cross-reference
interchangeable
24009Interchangeable
interchangeable cross-reference
interchangeable
39581-39520Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51511B4?
MS51511B4 is a BEARING,ROLLER,TAPERED.
What parts can replace MS51511B4?
There are 18 known substitutes for MS51511B4: S9300F921869PC63, 17554, 22788 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51511B4?
MS51511B4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-218-0147. 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