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4638K12 — COUPLING,PIPE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

4638K12: COUPLING,PIPE.

The COUPLING,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, connection_style: PLAIN (PIPE) ALL ENDS, style_designator: PLAIN, surface_treatment: ZINC INSIDE, nominal_thread_size: 0.250 INCHES ALL ENDS IN, nominal_overall_length: 1.188 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-151-6688, 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
4638K12
NSN: 4730-00-151-6688
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 0KVE6 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
connection_stylePLAIN (PIPE) ALL ENDS
style_designatorPLAIN
surface_treatmentZINC INSIDE
nominal_thread_size0.250 INCHES ALL ENDS IN
nominal_overall_length1.188 INCHES IN
thread_series_designatorNPT ALL ENDS
NSN4730-00-151-6688
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4638K12 · 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
•
CONNECTION STYLE: PLAIN (PIPE) ALL ENDS
•
NOMINAL OVERALL LENGTH: 1.188 INCHES IN
•
STYLE DESIGNATOR: PLAIN
•
NOMINAL THREAD SIZE: 0.250 INCHES ALL ENDS IN
•
SURFACE TREATMENT: ZINC INSIDE
•
MATERIAL: STEEL OVERALL
•
THREAD SERIES DESIGNATOR: NPT ALL ENDS
TECHNICAL CHARACTERISTICS
CONNECTION STYLEPLAIN (PIPE) ALL ENDS
NOMINAL OVERALL LENGTH1.188 INCHES IN
STYLE DESIGNATORPLAIN
NOMINAL THREAD SIZE0.250 INCHES ALL ENDS IN
SURFACE TREATMENTZINC INSIDE
MATERIALSTEEL OVERALL
THREAD SERIES DESIGNATORNPT ALL ENDS
SUBSTITUTES & CROSS-REFERENCES 1
68483Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
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 4638K12?
4638K12 is a COUPLING,PIPE.
What parts can replace 4638K12?
There is 1 known substitute for 4638K12: 68483. Substitute compatibility should be verified for your specific system.
What is the NSN for 4638K12?
4638K12 is cataloged in the U.S. Government catalog under NSN 4730-00-151-6688. 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.