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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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

131.48 DT

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Description

🔧 Lock in reliability with ARB’s precision air fitting—because your adventure deserves the best!

AUSTRALIAN MADE QUALITY - Designed and manufactured in Australia, guaranteeing premium craftsmanship and reliability.
PERFECT FIT EVERY TIME - Unique 1/8" BSPP thread size tailored for 5mm tubing—rare and hard to find elsewhere, making this a must-have upgrade.
RUGGED METAL CONSTRUCTION - Built to withstand harsh climates and tough off-road conditions without compromising performance.
SEAMLESS ARB COMPATIBILITY - Specifically engineered for ARB Air Locker and Trail-Gear Rear Disconnect lines, ensuring flawless integration.
PRECISION PUSH TO CONNECT DESIGN - 5mm nylon tubing slides in effortlessly for a secure, leak-free connection every time.

The ARB 170201 Air Fitting Straight R1 5SP is a high-quality metal push-to-connect fitting designed specifically 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 solution that’s tough enough for extreme off-road conditions.

Specifications

ASIN	B00042KQZS
Best Sellers Rank	#982,799 in Automotive ( See Top 100 in Automotive ) #1,935 in Automotive Replacement Fuel System Fittings
Brand Name	ARB
Color	Orange
Connector Type	Push-to-Connect
Customer Reviews	4.6 4.6 out of 5 stars (78)
Item Dimensions	5 x 5 x 5 inches
Manufacturer	ARB
Manufacturer Part Number	170201
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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131.48 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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