How to Measure the Replacement Carriage Bolt - M6 x 75mm

Question

Question:

Where are these measured from? The top of the head, just under the head, or just under the square measuring only the threads?

asked by: Martin T

0

75mm Bolt
(click to enlarge)

Expert Reply:

Hey Martin, thanks for the picture. The 75mm of the Replacement Carriage Bolt item # TH915-0675-11 is measured from from where the shank meets the head to the very tip of the fastener. Basically, the insertable portion that threads into something. The bolt in your picture would be 75mm long.

The Replacement Carriage Bolt item # TH915-0675-11 is designed for Thule roof boxes. Are you needing to replace a bolt in a roof box and if so which one?

expert reply by: Jerred H

0

Jerred H.

9/2/2025

Hey Martin, did the explanation about the carriage bolt measurement help with your roof box setup? If you’re still working on it, I’m happy to help.

Answer 1

The Thule Replacement M6 x 60 mm Carriage Bolt #915-0660-31 that you referenced is intended for use with a specific kayak carrier, the Stacker #TH830. It also works with their roof-mount bike wheel carrier #TH98BV. Thule offers a range of other…

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Answer 2

My contact at Thule checked the fit for all of their roof-rack-mount single bike carriers and advised that none are a confirmed fit for the factory roof rack crossbars on the Mini Cooper. As you note, the unusual thickness of the OEM bars makes them…

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Answer 3

Hey Girah, as long as you'd be okay with a 9 mm shorter bolt than what you mentioned yes the part #TH56NW would work for you.

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Answer 4

The longest Thule M6 bolt I'm aware of is the Replacement M6 x 92 T-Bolt for Thule Criterium Roof Mounted Bike Carrier #853-6511, which is 92mm long and might work for your application.

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Answer 5

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 6

Sounds like the #THXADAPT3 is exactly what you need. This comes with 8 M6 bolts that are 80 mm long that are designed to let a Thule Hull-A-Port Kayak Carrier #TH834 install on taller crossbars like it sounds like you have.

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Answer 7

Hello Rick, thanks for reaching out. Go ahead and email those pictures over to me. My email is [email protected]. Also any other info you have on this roof rack will be helpful. If you can tell me the dimensions of the crossbars, or the…

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Answer 8

Hey Dean, of the 4 rod carriers we offer the only one that has the cut out area for the rods is the Rhino Rack par #RR572.

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Answer 9

It sounds like you have the Thule Hull-A-Port, #TH834, which should fit the Yakima round bars. The Yakima round bars are only 1/4 inch taller than the Thule bars. But if it is not working then you would need longer bolts. The Hull-A-Port originally…

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Answer 10

The Replacement Wheel Tray for Thule Big Mouth Roof Mounted Bike Carrier #853-5423-56 does not include the mounting hardware. You will also want 2 bolts #915064554, 2 washer plates #853-0333-02, and 2 of the Replacement 3-wing hand knob #753-0745 to…

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Answer 11

I spoke with my contact at Thule and the Fairing for Roof Racks, #TH82WV, was designed for use on the Thule square bars. Since test fits have only been performed on Thule crossbars, we can not guarantee that the fairing will work on all square…

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Answer 12

The SportRack Roof Rack for Naked Roofs part #SR1002, which you reference, is a confirmed fit for your 2007 Chevy Aveo5. This semi-custom fit is adjustable with crossbars that are 50" long. As long as your naked roof measures 50" or less…

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How to Measure the Replacement Carriage Bolt - M6 x 75mm

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