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PH21 — RELAY,ELECTROMAGNETIC

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

PH21: RELAY,ELECTROMAGNETIC.

The RELAY,ELECTROMAGNETIC is a the manufacturer industrial component. Key specifications include material: GLASS FIBER OVERALL, nominal_thread_size: 4.000 INCHES ALL ENDS IN, thread_series_designator: NPT ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-247-3139, 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
PH21
NSN: 4730-01-247-3139
NIINs: 012473139, 012970814
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 61516 — ROVANCO PIPING SYSTEMS INC. (USA)
SPECIFICATIONS
materialGLASS FIBER OVERALL
nominal_thread_size4.000 INCHES ALL ENDS IN
thread_series_designatorNPT ALL ENDS
NSN4730-01-247-3139
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: PH21 · 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
•
NOMINAL THREAD SIZE: 4.000 INCHES ALL ENDS IN
•
MATERIAL: GLASS FIBER OVERALL
•
THREAD SERIES DESIGNATOR: NPT ALL ENDS
TECHNICAL CHARACTERISTICS
NOMINAL THREAD SIZE4.000 INCHES ALL ENDS IN
MATERIALGLASS FIBER OVERALL
THREAD SERIES DESIGNATORNPT ALL ENDS
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 PH21?
PH21 is a RELAY,ELECTROMAGNETIC.
What is the NSN for PH21?
PH21 is cataloged in the U.S. Government catalog under NSN 4730-01-247-3139. 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.