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4429K121 — LOCKNUT,PIPE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

4429K121: LOCKNUT,PIPE.

The LOCKNUT,PIPE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, nut_style: PIPE LOCKNUT, nut_height: 0.19 INCHES NOMINAL IN, thread_series: NPSL, thread_direction: RIGHT-HAND, width_across_flats: 0.75 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-651-6897, 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
4429K121
NSN: 4730-01-651-6897
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_stylePIPE LOCKNUT
nut_height0.19 INCHES NOMINAL IN
thread_seriesNPSL
thread_directionRIGHT-HAND
width_across_flats0.75 INCHES NOMINAL IN
nominal_thread_size0.125 INCHES IN
part_name_assigned_by_controlling_agencyLOW PRESSURE BRASS THREADED PIPE FITTING
NSN4730-01-651-6897
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4429K121 · 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: 0.75 INCHES NOMINAL IN
•
THREAD SERIES: NPSL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.125 INCHES IN
•
NUT HEIGHT: 0.19 INCHES NOMINAL IN
•
NUT STYLE: PIPE LOCKNUT
•
MATERIAL: COPPER ALLOY OVERALL
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.75 INCHES NOMINAL IN
THREAD SERIESNPSL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.125 INCHES IN
NUT HEIGHT0.19 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYLOW PRESSURE BRASS THREADED PIPE FITTING
NUT STYLEPIPE LOCKNUT
MATERIALCOPPER ALLOY OVERALL
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 4429K121?
4429K121 is a LOCKNUT,PIPE.
What is the NSN for 4429K121?
4429K121 is cataloged in the U.S. Government catalog under NSN 4730-01-651-6897. 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.