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Technical Data Sheet
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81TS5 ✓ 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 INVERTED NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, seat_radius: 0.219 INCHES NOMINAL IN, thread_size: 1/2-20, thread_class: 2A A, overall_length: 0.609 INCHES NOMINAL IN, style_designator: INVERTED NUT, TUBE, COMPRESSION. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-288-8011, 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
81TS5
NSN: 4730-00-288-8011
FSC: 4730
CAGE: 93061 — PARKER-HANNIFIN CORP DIV FLUID SYSTEM CONNECTOR DIVISION (USA)
SPECIFICATIONS
materialCOPPER ALLOY
seat_radius0.219 INCHES NOMINAL IN
thread_size1/2-20
thread_class2A A
overall_length0.609 INCHES NOMINAL IN
style_designatorINVERTED NUT, TUBE, COMPRESSION
thread_directionRIGHT-HAND
width_across_flats0.500 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
end_item_identificationGRUMMAN A-10 AIRCRAFT
smallest_inside_diameter0.316 INCHES NOMINAL IN
screw_thread_series_designatorUNF
NSN4730-00-288-8011
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 81TS5 · 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
•
THREAD CLASS: 2A A
•
SMALLEST INSIDE DIAMETER: 0.316 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
SEAT RADIUS: 0.219 INCHES NOMINAL IN
•
STYLE DESIGNATOR: INVERTED NUT, TUBE, COMPRESSION
•
THREAD SIZE: 1/2-20
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.313 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2A A
SMALLEST INSIDE DIAMETER0.316 INCHES NOMINAL IN
MATERIALCOPPER ALLOY
CASEHARDENING INDICATORNOT CASEHARDENED
SEAT RADIUS0.219 INCHES NOMINAL IN
STYLE DESIGNATORINVERTED NUT, TUBE, COMPRESSION
THREAD SIZE1/2-20
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.313 INCHES NOMINAL IN
OVERALL LENGTH0.609 INCHES NOMINAL IN
END ITEM IDENTIFICATIONGRUMMAN A-10 AIRCRAFT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
1570Interchangeable
interchangeable cross-reference
interchangeable
1570-9 10 FEETInterchangeable
interchangeable cross-reference
interchangeable
1570-10 FOOTInterchangeable
interchangeable cross-reference
interchangeable
106-10004Interchangeable
interchangeable cross-reference
interchangeable
114963Interchangeable
interchangeable cross-reference
interchangeable
702C-11-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 81TS5?
81TS5 is a INVERTED NUT,TUBE COUPLING.
What parts can replace 81TS5?
There are 24 known substitutes for 81TS5: 1570, 1570-9 10 FEET, 1570-10 FOOT and 21 more. Substitute compatibility should be verified for your specific system.
Is 81TS5 still available?
81TS5 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