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A818-20 ✓ 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 ADAPTER,STRAIGHT,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: TUBE COUPLING, nut_height: 1.214 INCHES MINIMUM AND 1.234 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT (UNJ), thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-105-3911, 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
A818-20
NSN: 4730-01-105-3911
FSC: 4730
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleTUBE COUPLING
nut_height1.214 INCHES MINIMUM AND 1.234 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT (UNJ)
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
length_to_shoulder1.017 INCHES NOMINAL IN
width_across_flats1.984 INCHES MINIMUM AND 2.016 INCHES MAXIMUM IN
nominal_thread_size1.625 INCHES IN
smallest_inside_diameter1.347 INCHES MINIMUM AND 1.350 INCHES MAXIMUM IN
thread_quantity_per_inch12
NSN4730-01-105-3911
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A818-20 · 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 DIRECTION: RIGHT-HAND
•
SMALLEST INSIDE DIAMETER: 1.347 INCHES MINIMUM AND 1.350 INCHES MAXIMUM IN
•
LENGTH TO SHOULDER: 1.017 INCHES NOMINAL IN
•
NOMINAL TUBE OUTSIDE DIAMETER: 1.250 INCHES IN
•
THREAD QUANTITY PER INCH: 12
•
SURFACE TREATMENT: CADMIUM OVERALL
•
NUT HEIGHT: 1.214 INCHES MINIMUM AND 1.234 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
SMALLEST INSIDE DIAMETER1.347 INCHES MINIMUM AND 1.350 INCHES MAXIMUM IN
LENGTH TO SHOULDER1.017 INCHES NOMINAL IN
NOMINAL TUBE OUTSIDE DIAMETER1.250 INCHES IN
THREAD QUANTITY PER INCH12
SURFACE TREATMENTCADMIUM OVERALL
NUT HEIGHT1.214 INCHES MINIMUM AND 1.234 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
THREAD SERIESUNIFIED NATIONAL JOINT (UNJ)
NOMINAL THREAD SIZE1.625 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
J514 20 070110CInterchangeable
interchangeable cross-reference
interchangeable
J514Interchangeable
interchangeable cross-reference
interchangeable
06B-20Interchangeable
interchangeable cross-reference
interchangeable
SAE-AS4841Interchangeable
Same NIIN cross-reference
interchangeable
AN818-20Interchangeable
Same NIIN cross-reference
interchangeable
AS4841Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A818-20?
A818-20 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace A818-20?
There are 6 known substitutes for A818-20: J514 20 070110C, J514, 06B-20 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A818-20?
A818-20 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-105-3911. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026