what is the thread size ? is it 1/4" NPT?

it's 1/8" BSPT with a 5mm OD for the tubing... pretty specific to ARB and very difficult to find elsewhere. You can find 4mm and 6mm 1/8" BSPT at McMaster-Carr and elsewhere, but nothing for the 5mm tubing.

What is this fitting used for?

Hello Max K.they are used when seeting up the airlines for a ARB AIR Locker or and ARB air compressor, if you have any more questions please call us 305-639-2361thank you

Can this replace the compression fitting portion of the bulkhead on the axle?

I guess you cold if the bulkhead fitting is British standard pipe threads. They are different than standard pipe threads. If they are tapped the same then yes you could use this fitting

Will this thread into the ARB solenoid or is there a different one

Not sure I Got mine for the rear diff.

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ARB 170201 Air Fitting Straight R1 5SP 5 mm to 1/8 mm. Ideal for an easy connection of the ARB Air Locker Line or the Trail-Gear Rear Disconnect

ARB 170201 Air Fitting Straight R1 5SP 5 mm to 1/8 mm. Ideal for an easy connection of the ARB Air Locker Line or the Trail-Gear Rear Disconnect

Product ID: 11707393

Details

Brand
ARB
Color
Orange
Connector Type
Item dimensions L x W x H
5 x 5 x 5
Manufacturer
ARB
Material
Metal

📏Precise 5mm OD tubing fit

🔩1/8" BSPP thread standard

🛠️Durable metal build

¥6096

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Description

🔧 Lock in your off-road edge with ARB’s precision air fitting!

RUGGED METAL DURABILITY - Crafted from high-grade metal to withstand harsh off-road conditions and climate extremes.
EXCLUSIVE 5 MM THREAD SIZE - Unique 1/8" BSPP thread tailored for 5mm tubing—hard to find elsewhere, making it a must-have upgrade.
PRECISION PUSH TO CONNECT - 5mm nylon tubing pushes in effortlessly, ensuring quick and secure air line connections.
SEAMLESS ARB COMPATIBILITY - Specifically engineered for ARB Air Locker and Trail-Gear Rear Disconnect for flawless integration.
AUSTRALIAN ENGINEERED QUALITY - Designed and manufactured in Australia, guaranteeing premium build and reliability.

The ARB 170201 Air Fitting Straight R1 5SP is a metal, push-to-connect fitting designed for 5mm OD nylon tubing with a 1/8" BSPP thread. Manufactured in Australia, it ensures a perfect, durable connection for ARB Air Locker Lines and Trail-Gear Rear Disconnects, offering a rare and precise fit that’s essential for off-road enthusiasts seeking reliable pneumatic hardware.

Specifications

ASIN	B00042KQZS
Best Sellers Rank	#312,652 in Automotive ( See Top 100 in Automotive ) #834 in Automotive Replacement Fuel System Fittings
Brand	ARB
Brand Name	ARB
Color	Orange
Connector Type	Push-to-Connect
Customer Reviews	4.6 out of 5 stars 78 Reviews
Item Dimensions	5 x 5 x 5 inches
Item dimensions L x W x H	5 x 5 x 5 inches
Manufacturer	ARB
Manufacturer Part Number	170201
Material	Metal
Material Type	Metal
Model Number	170201
Number of Pieces	8
Size	5mm
Thread Size	0.125 inch
Thread Type	BSPP
Unit Count	1 Count

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¥6096

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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