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Technical Data Sheet
PartsTable / COMPONENT / BT-3/4
BT-3/4 ✓ 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 BT-3/4 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 4730-01-189-8847, 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
BT-3/4
NSN: 4730-01-189-8847
FSC: 4730
CAGE: 53059 — SPIRAX SARCO INC DBA SPIRAX SARCO (USA)
SPECIFICATIONS
Part NumberBT-3/4
NSN4730-01-189-8847
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: BT-3/4 · 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
•
OPERATING PRESSURE: 250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
•
MEDIA FOR WHICH DESIGNED: FUEL/OIL, HYDROCARBON
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM-B-62 ASSN STD 1ST MATERIAL RESPONSE BODY
•
FILTERING MEDIA DESIGN: MESH ALL FILTERING MEDIA RESPONSES
•
STYLE DESIGNATOR: Y STRAINER W/BOLTED COVER
•
MATERIAL: STEEL CORROSION RESISTING SCREENING
•
MOUNTING TYPE: INLET CONNECTION AND OUTLET CONNECTION UPPER SIDE
•
MESH SIZE: 20.0
TECHNICAL CHARACTERISTICS (FLIS)
OPERATING PRESSURE250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
MEDIA FOR WHICH DESIGNEDFUEL/OIL, HYDROCARBON
MATERIAL DOCUMENT AND CLASSIFICATIONASTM-B-62 ASSN STD 1ST MATERIAL RESPONSE BODY
FILTERING MEDIA DESIGNMESH ALL FILTERING MEDIA RESPONSES
STYLE DESIGNATORY STRAINER W/BOLTED COVER
MATERIALSTEEL CORROSION RESISTING SCREENING
MOUNTING TYPEINLET CONNECTION AND OUTLET CONNECTION UPPER SIDE
MESH SIZE20.0
MATERIALCOPPER ALLOY BODY
TEMP RATING460.0 FAHRENHEIT NOMINAL DEGF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
51991Interchangeable
interchangeable cross-reference
interchangeable
08-00470-000Interchangeable
interchangeable cross-reference
interchangeable
51991-5305Interchangeable
interchangeable cross-reference
interchangeable
51991-1Interchangeable
interchangeable cross-reference
interchangeable
51991-23-5Interchangeable
interchangeable cross-reference
interchangeable
51991-23.5Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BT-3/4?
BT-3/4 is a BT-3/4.
What parts can replace BT-3/4?
There are 9 known substitutes for BT-3/4: 51991, 08-00470-000, 51991-5305 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for BT-3/4?
BT-3/4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-189-8847. 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.
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Last verified: July 2026