PartsTable
Technical Data Sheet
STD-251-1 ✓ 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

ADAPTER,STRAIGHT,FLANGE TO PIPE. Key specifications include material: ALUMINUM ALLOY 6061 OVERALL, connection_type: BUTT WELD PIPE SECOND END, connection_style: PLAIN (PIPE) SECOND END, special_features: 1.5" O.D.; WELDED TO BOTTOM FRO .75" PIPE PLUG, nominal_thread_size: 0.750 INCHES FIRST END IN, nominal_overall_length: 0.500 INCHES IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-515-8531, 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
STD-251-1
NSN: 4730-01-515-8531
FSC: 4730
CAGE: 05259 — CONTAINER RESEARCH CORP DBA CONTAINER RESEARCH CORP DIV CONTAINR RESEARCH CORPORATION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 6061 OVERALL
connection_typeBUTT WELD PIPE SECOND END
connection_stylePLAIN (PIPE) SECOND END
special_features1.5" O.D.; WELDED TO BOTTOM FRO .75" PIPE PLUG
nominal_thread_size0.750 INCHES FIRST END IN
nominal_overall_length0.500 INCHES IN
end_item_identificationCONTAINER
thread_series_designatorNPT FIRST END
nominal_pipe_size_accommodated0.750 INCHES SECOND END IN
material_document_and_classificationASTM B209 6061-T651 FED STD SINGLE MATERIAL RESPONSE OVERALL
part_name_assigned_by_controlling_agencyDRAIN PLUG BOSS
pipe_wall_thickness_designation_for_which_designedSCHEDULE STD FIRST END
NSN4730-01-515-8531
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: STD-251-1 · 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 OVERALL LENGTH: 0.500 INCHES IN
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM B209 6061-T651 FED STD SINGLE MATERIAL RESPONSE OVERALL
CONNECTION STYLE: PLAIN (PIPE) FIRST END
PIPE WALL THICKNESS DESIGNATION FOR WHICH DESIGNED: SCHEDULE STD SECOND END
CONNECTION TYPE: BUTT WELD PIPE SECOND END
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL OVERALL LENGTH0.500 INCHES IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM B209 6061-T651 FED STD SINGLE MATERIAL RESPONSE OVERALL
CONNECTION STYLEPLAIN (PIPE) FIRST END
PIPE WALL THICKNESS DESIGNATION FOR WHICH DESIGNEDSCHEDULE STD SECOND END
SPECIAL FEATURES1.5" O.D.; WELDED TO BOTTOM FRO .75" PIPE PLUG
CONNECTION STYLEPLAIN (PIPE) SECOND END
END ITEM IDENTIFICATIONCONTAINER
CONNECTION TYPEBUTT WELD PIPE SECOND END
CONNECTION TYPETHREADED INTERNAL PIPE FIRST END
PIPE WALL THICKNESS DESIGNATION FOR WHICH DESIGNEDSCHEDULE STD FIRST END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
1210-00Interchangeable
interchangeable cross-reference
interchangeable
STD251Interchangeable
interchangeable cross-reference
interchangeable
2239HXInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is STD-251-1?
STD-251-1 is a ADAPTER,STRAIGHT,FLANGE TO PIPE.
What parts can replace STD-251-1?
There are 3 known substitutes for STD-251-1: 1210-00, STD251, 2239HX. Substitute compatibility should be verified for your specific system.
What is the NSN for STD-251-1?
STD-251-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-515-8531. This indicates validated use in U.S. government and defense supply chains.
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