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PartsTable / COMPONENT / ST17 3/4IN. NPT
ST17 3/4IN. NPT ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The ST17 3/4IN. NPT is a the manufacturer industrial component. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-313-8766, 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
ST17 3/4IN. NPT
NSN: 4730-01-313-8766
FSC: 4730
CAGE: 53059 — SPIRAX SARCO INC DBA SPIRAX SARCO (USA)
SPECIFICATIONS
Part NumberST17 3/4IN. NPT
NSN4730-01-313-8766
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: ST17 3/4IN. NPT · 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
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: DUCTILE IRON SENSOR CHAMBER; STAINLESS STEEL 303 SENSOR; STAINLESS STEEL 304 SENSOR GASKET; 464PSI AND 464F 32BAR AT 239C WORKING CONDITIONS; INSTALLED IMMEDIATELY UPSTREAM OF THE TRAP; BLANKING PLUG OPTIONAL EXTRA; DESIGNED TO INDICATE IF STEAM TRAP IS LEAKING STEAM
TECHNICAL CHARACTERISTICS (FLIS)
GENERAL CHARACTERISTICS ITEM DESCRIPTIONDUCTILE IRON SENSOR CHAMBER; STAINLESS STEEL 303 SENSOR; STAINLESS STEEL 304 SENSOR GASKET; 464PSI AND 464F 32BAR AT 239C WORKING CONDITIONS; INSTALLED IMMEDIATELY UPSTREAM OF THE TRAP; BLANKING PLUG OPTIONAL EXTRA; DESIGNED TO INDICATE IF STEAM TRAP IS LEAKING STEAM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
307-4Interchangeable
interchangeable cross-reference
interchangeable
1122-30Interchangeable
interchangeable cross-reference
interchangeable
ST17Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ST17 3/4IN. NPT?
ST17 3/4IN. NPT is a ST17 3/4IN. NPT.
What parts can replace ST17 3/4IN. NPT?
There are 3 known substitutes for ST17 3/4IN. NPT: 307-4, 1122-30, ST17. Substitute compatibility should be verified for your specific system.
What is the NSN for ST17 3/4IN. NPT?
ST17 3/4IN. NPT is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-313-8766. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026