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Technical Data Sheet
PartsTable / COMPONENT / 1641-250
1641-250 ✓ 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 UNION,PIPE is a the manufacturer industrial component. Key specifications include end_item_identification: CATERPILLAR 428D, LOADER/BACKHOE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-476-6444, 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
1641-250
NSN: 4730-00-476-6444
FSC: 4730
CAGE: 72423 — FLAGG STANLEY G & CO INC DBA FLAGG BRASS (USA)
SPECIFICATIONS
end_item_identificationCATERPILLAR 428D, LOADER/BACKHOE
NSN4730-00-476-6444
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1641-250 · 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: 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS
•
MEDIA FOR WHICH DESIGNED: STEAM FIRST RESPONSE
•
MATERIAL: IRON OR IRON ALLOY BODY
•
SURFACE TREATMENT: ZINC SEAT
•
CONNECTION TYPE: THREADED INTERNAL PIPE ALL ENDSTHREADED INTERNAL PIPE ALL ENDS
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A197 ASSN STD SINGLE MATERIAL RESPONSE BODY
TECHNICAL CHARACTERISTICS (FLIS)
OPERATING PRESSURE300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS
MEDIA FOR WHICH DESIGNEDSTEAM FIRST RESPONSE
MEDIA FOR WHICH DESIGNEDWATER-OIL-GAS SECOND RESPONSE
MATERIALIRON OR IRON ALLOY BODY
SURFACE TREATMENTZINC SEAT
MATERIALCOPPER ALLOY OR IRON SEAT
CONNECTION TYPETHREADED INTERNAL PIPE ALL ENDSTHREADED INTERNAL PIPE ALL ENDS
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A197 ASSN STD SINGLE MATERIAL RESPONSE BODY
MAXIMUM OPERATING TEMP500.0 FAHRENHEIT SINGLE RESPONSE500.0 FAHRENHEIT SINGLE RESPONSE DEGF
NOMINAL OVERALL LENGTH2.810 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
7685Interchangeable
interchangeable cross-reference
interchangeable
T0V10N0125SETF0R72VInterchangeable
interchangeable cross-reference
interchangeable
GS4843Interchangeable
interchangeable cross-reference
interchangeable
MILU18250Interchangeable
interchangeable cross-reference
interchangeable
519-3-4Interchangeable
interchangeable cross-reference
interchangeable
B16.39Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1641-250?
1641-250 is a UNION,PIPE.
What parts can replace 1641-250?
There are 18 known substitutes for 1641-250: 7685, T0V10N0125SETF0R72V, GS4843 and 15 more. Substitute compatibility should be verified for your specific system.
Is 1641-250 still available?
1641-250 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026