PartsTable
Technical Data Sheet

1661-1 1/2 — TEE,PIPE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

1661-1 1/2: TEE,PIPE.

The TEE,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 316L OVERALL, leg_length: 2.000 INCHES NOMINAL ALL ENDS IN, connection_type: UNTHREADED INTERNAL PIPE ALL ENDS, connection_style: SOCKET (PIPE) ALL ENDS, operating_pressure: 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS, media_for_which_designed: WATER-OIL-GAS THIRD RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-277-1382, 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
1661-1 1/2
NSN: 4730-01-277-1382
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 34646 — ATI LADISH LLC DBA ATI WAH CHANG DIV ATI FORGED PRODUCTS - CUDAHY (USA)
SPECIFICATIONS
materialSTEEL COMP 316L OVERALL
leg_length2.000 INCHES NOMINAL ALL ENDS IN
connection_typeUNTHREADED INTERNAL PIPE ALL ENDS
connection_styleSOCKET (PIPE) ALL ENDS
operating_pressure6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
media_for_which_designedWATER-OIL-GAS THIRD RESPONSE
nondefinitive_spec/std_data4 TABLE
specification/standard_data80204-B16.11 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
nominal_pipe_size_accommodated1.500 INCHES ALL ENDS IN
material_document_and_classificationASTM-A182,GRADE-F ASSN STD SINGLE MATERIAL RESPONSE OVERALL
pipe_wall_thickness_designation_for_which_designedSCHEDULE 160 ALL ENDS
NSN4730-01-277-1382
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1661-1 1/2 · 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 PIPE SIZE ACCOMMODATED: 1.500 INCHES ALL ENDS IN
•
CONNECTION STYLE: SOCKET (PIPE) ALL ENDS
•
CONNECTION TYPE: UNTHREADED INTERNAL PIPE ALL ENDS
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM-A182,GRADE-F ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
OPERATING PRESSURE: 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
LEG LENGTH: 2.000 INCHES NOMINAL ALL ENDS IN
•
SPECIFICATION/STANDARD DATA: 80204-B16.11 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
NONDEFINITIVE SPEC/STD DATA: 4 TABLE
TECHNICAL CHARACTERISTICS
NOMINAL PIPE SIZE ACCOMMODATED1.500 INCHES ALL ENDS IN
CONNECTION STYLESOCKET (PIPE) ALL ENDS
CONNECTION TYPEUNTHREADED INTERNAL PIPE ALL ENDS
MATERIAL DOCUMENT AND CLASSIFICATIONASTM-A182,GRADE-F ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OPERATING PRESSURE6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
LEG LENGTH2.000 INCHES NOMINAL ALL ENDS IN
SPECIFICATION/STANDARD DATA80204-B16.11 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NONDEFINITIVE SPEC/STD DATA4 TABLE
PIPE WALL THICKNESS DESIGNATION FOR WHICH DESIGNEDSCHEDULE 160 ALL ENDS
MEDIA FOR WHICH DESIGNEDWATER-OIL-GAS THIRD RESPONSE
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES 1
B16.11Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1661-1 1/2?
1661-1 1/2 is a TEE,PIPE.
What parts can replace 1661-1 1/2?
There is 1 known substitute for 1661-1 1/2: B16.11. Substitute compatibility should be verified for your specific system.
What is the NSN for 1661-1 1/2?
1661-1 1/2 is cataloged in the U.S. Government catalog under NSN 4730-01-277-1382. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.