PartsTable
Technical Data Sheet
STD251 ✓ Verified by PartsTable
· NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
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) FIRST 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 part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-209-1218, 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
STD251
NSN: 5310-00-209-1218
FSC: 5310
CAGE: 80254 — TEXTRON LYCOMING INC WILLIAMSPORT PLANT (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 6061 OVERALL
connection_typeBUTT WELD PIPE SECOND END
connection_stylePLAIN (PIPE) FIRST 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
NSN5310-00-209-1218
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: STD251 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
28150Interchangeable
interchangeable cross-reference
interchangeable
188138Interchangeable
interchangeable cross-reference
interchangeable
A02157-121Interchangeable
interchangeable cross-reference
interchangeable
121000Interchangeable
interchangeable cross-reference
interchangeable
GHN10277-1Interchangeable
interchangeable cross-reference
interchangeable
4330002886907Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is STD251?
STD251 is a ADAPTER,STRAIGHT,FLANGE TO PIPE.
What parts can replace STD251?
There are 17 known substitutes for STD251: 28150, 188138, A02157-121 and 14 more. Substitute compatibility should be verified for your specific system.
Is STD251 still available?
STD251 is currently cancelled.
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