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4BL-S — NUT,TUBE COUPLING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

4BL-S: NUT,TUBE COUPLING.

The NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: TUBE COUPLING, nut_height: 0.59 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNF, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-663-7869, 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
4BL-S
NSN: 4730-01-663-7869
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 50421 — PARKER HANNIFIN CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleTUBE COUPLING
nut_height0.59 INCHES NOMINAL IN
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
fabrication_methodMACHINED
width_across_flats0.41 INCHES NOMINAL IN
nominal_thread_size0.5625 INCHES IN
smallest_inside_diameter0.25 INCHES NOMINAL IN
thread_quantity_per_inch18
nominal_tube_outside_diameter0.25 INCHES IN
NSN4730-01-663-7869
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4BL-S · 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
•
WIDTH ACROSS FLATS: 0.41 INCHES NOMINAL IN
•
THREAD SERIES: UNF
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.5625 INCHES IN
•
NUT HEIGHT: 0.59 INCHES NOMINAL IN
•
NUT STYLE: TUBE COUPLING
•
THREAD CLASS: 2B
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.41 INCHES NOMINAL IN
THREAD SERIESUNF
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.5625 INCHES IN
NUT HEIGHT0.59 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYTUBE NUT
NUT STYLETUBE COUPLING
THREAD CLASS2B
THREAD QUANTITY PER INCH18
MATERIALSTEEL OVERALL
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES 1
229L65325-M00Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4BL-S?
4BL-S is a NUT,TUBE COUPLING.
What parts can replace 4BL-S?
There is 1 known substitute for 4BL-S: 229L65325-M00. Substitute compatibility should be verified for your specific system.
What is the NSN for 4BL-S?
4BL-S is cataloged in the U.S. Government catalog under NSN 4730-01-663-7869. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.