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FS0306-20 — LOCKNUT,TUBE FITTING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

FS0306-20: LOCKNUT,TUBE FITTING.

The LOCKNUT,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: TUBE FITTING LOCKNUT, nut_height: 0.410 INCHES NOMINAL IN, thread_series: UN, thread_direction: RIGHT-HAND, width_across_flats: 2.000 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-629-4701, 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
FS0306-20
NSN: 4730-01-629-4701
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 5E240 — BRENNAN INDUSTRIES (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleTUBE FITTING LOCKNUT
nut_height0.410 INCHES NOMINAL IN
thread_seriesUN
thread_directionRIGHT-HAND
width_across_flats2.000 INCHES NOMINAL IN
nominal_thread_size1.688 INCHES IN
end_item_identification3805-01-533-1853; HEAVY TYPE II LOADER
thread_quantity_per_inch12
nominal_tube_outside_diameter1.250 INCHES IN
part_name_assigned_by_controlling_agency20BULKHEAD LOCK NUT
NSN4730-01-629-4701
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: FS0306-20 · 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: 2.000 INCHES NOMINAL IN
•
THREAD SERIES: UN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 1.688 INCHES IN
•
NUT HEIGHT: 0.410 INCHES NOMINAL IN
•
NUT STYLE: TUBE FITTING LOCKNUT
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS2.000 INCHES NOMINAL IN
THREAD SERIESUN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE1.688 INCHES IN
NUT HEIGHT0.410 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCY20BULKHEAD LOCK NUT
NUT STYLETUBE FITTING LOCKNUT
END ITEM IDENTIFICATION3805-01-533-1853; HEAVY TYPE II LOADER
THREAD QUANTITY PER INCH12
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is FS0306-20?
FS0306-20 is a LOCKNUT,TUBE FITTING.
What is the NSN for FS0306-20?
FS0306-20 is cataloged in the U.S. Government catalog under NSN 4730-01-629-4701. 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.