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Technical Data Sheet
PartsTable / COMPONENT / 1266M5
1266M5 ✓ 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

SLEEVE,COMPRESSION,TUBE-HOSE FIT. Key specifications include material: COPPER ALLOY OVERALL, leg_length: 1.100 INCHES NOMINAL ALL ENDS IN, seat_angle: 20.0 DEGREES ALL ENDS, thread_class: 2A ALL ENDS A, connection_type: THREADED EXTERNAL TUBE ALL ENDS, connection_style: FLARELESS (TUBE) ALL ENDS. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-277-7333, 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
1266M5
NSN: 4730-00-277-7333
FSC: 4730
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
leg_length1.100 INCHES NOMINAL ALL ENDS IN
seat_angle20.0 DEGREES ALL ENDS
thread_class2A ALL ENDS A
connection_typeTHREADED EXTERNAL TUBE ALL ENDS
connection_styleFLARELESS (TUBE) ALL ENDS
nominal_thread_size0.812 INCHES ALL ENDS IN
thread_quantity_per_inch18 ALL ENDS
thread_series_designatorUNS ALL ENDS
nondefinitive_spec/std_data3A FIGURE A
specification/standard_data81343-J246 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
furnished_items_and_quantity3 TUBE COUPLING NUT W/SLEEVE
NSN4730-00-277-7333
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1266M5 · 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
•
MATERIAL: COPPER ALLOY OVERALL
•
THREAD QUANTITY PER INCH: 18 ALL ENDS
•
NONDEFINITIVE SPEC/STD DATA: 3A FIGURE A
•
CONNECTION TYPE: THREADED EXTERNAL TUBE ALL ENDS
•
THREAD SERIES DESIGNATOR: UNS ALL ENDS
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.625 INCHES ALL ENDS IN
•
THREAD CLASS: 2A ALL ENDS A
•
FURNISHED ITEMS AND QUANTITY: 3 TUBE COUPLING NUT W/SLEEVE
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY OVERALL
THREAD QUANTITY PER INCH18 ALL ENDS
NONDEFINITIVE SPEC/STD DATA3A FIGURE A
CONNECTION TYPETHREADED EXTERNAL TUBE ALL ENDS
THREAD SERIES DESIGNATORUNS ALL ENDS
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.625 INCHES ALL ENDS IN
THREAD CLASS2A ALL ENDS A
FURNISHED ITEMS AND QUANTITY3 TUBE COUPLING NUT W/SLEEVE
CONNECTION STYLEFLARELESS (TUBE) ALL ENDS
SPECIFICATION/STANDARD DATA81343-J246 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
SAE-J512Interchangeable
interchangeable cross-reference
interchangeable
SAE J512 8-6 040102BInterchangeable
interchangeable cross-reference
interchangeable
J512Interchangeable
interchangeable cross-reference
interchangeable
SAE J512 14 010111BInterchangeable
interchangeable cross-reference
interchangeable
41F78Interchangeable
interchangeable cross-reference
interchangeable
221984Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1266M5?
1266M5 is a SLEEVE,COMPRESSION,TUBE-HOSE FIT.
What parts can replace 1266M5?
There are 27 known substitutes for 1266M5: SAE-J512, SAE J512 8-6 040102B, J512 and 24 more. Substitute compatibility should be verified for your specific system.
Is 1266M5 still available?
1266M5 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