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.

170201 Air Fitting Straight R1 5sp 5 Mm To 1

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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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	#698,216 in Automotive ( See Top 100 in Automotive ) #1,478 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

Reviews

A**R

Replacement for the original on my arb compressor

Perfect replacement for my arm compressor. Have the double compressor for my front air locker. It is an odd pipe diameter, so nothing else fits.

26.07.2026

R**.

Works great

Works as described.

4.02.2026

B**D

Great replacement!

Absolutely perfect fit, and a great upgrade for any version. I have the older style (2005 installed) and it worked like a charm. The one thing is be wary of over tightening!! I initially had it a quarter turn too tight, and the fitting wouldn’t allow the locker to disengage... just be wary!

28.08.2019

G**.

Works

Works good, lasts a long time.

10.12.2019

P**Y

Four Stars

just what I needed

11.03.2018

M**.

Works like it should

8.09.2019

R**D

Five Stars

fits like it should

27.06.2018

J**N

👍🏼

30.11.2018

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