bolt thickness? 3/8"?

Thank you very much for your question. The bolt of this magnet is metric M8. For D3/8'' thread , see the following link: https://www.amazon.com/dp/B08JSNK6YK?ref=myi_title_dp

Is it the neodymium magnets?

I cannot tell, the base is covered with steel over the magnet. It is very strong and the thicker the metal the stronger it holds. I think they are a great value. Using mine to hold LED portable lights I use.

Are these strong enough to be used as a rooftop light bar holder for speeds at/near 60 MPH?

Light bars may weigh ounces to many pounds with a wide range of air resistance so an accurate answer is impossible . However, I can say, this magnet is very, very strong! I have to pry it off a steel plate with pliers. Suggestion....if using on your vehicle put very thin rubber mat under it so it doesn't leave a rust mark or scratches. Also, there are larger, stronger ones on Amazon.

What is the pitch size of the thread. M-8 x 1.25 or M-8 x 1 ?

Interesting that supplier has not replied. Mine were 1/4-20 on a different magnet. From the pictures they appear to be more 1.25 coarse than 1.00 fine thread.

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MUTUACTOR 2PCS Super Strong Neodymium Round Magnet Base with 1/4''-20 Male Threaded Stud,185lb Pulling Force Magnetic Mount Heavy Duty Magnets for Led Lighting Camera Tools and Others Equipments

MUTUACTOR 2PCS Super Strong Neodymium Round Magnet Base with 1/4''-20 Male Threaded Stud,185lb Pulling Force Magnetic Mount Heavy Duty Magnets for Led Lighting Camera Tools and Others Equipments

Product ID: 92524856

Details

Brand
MUTUACTOR
Color
185 lbs Male
Material
A3 Iron Steel
Product Dimensions
1.65"L x x
Shape
Round

🔩1/4''-20 male threaded stud

🧲185lb pull force

🛡️A3 steel anti-rust protector

€ 40.52

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Description

🧲 Lock it down with MUTUACTOR – where strength meets precision!

BUILT TO ENDURE - A3 steel shell and Ni+Cu+Ni triple-layer coating resist rust and damage.
TRUSTED BY PROS - Top-rated magnet with 4.7 stars from 689 reviews—join the elite users.
THREADED VERSATILITY - 1/4''-20 male stud fits seamlessly with cameras, lights, and tools.
MULTI SCENARIO MOUNTING - Perfect for workshops, vehicles, marine use, and emergency setups.
UNMATCHED HOLDING POWER - 185lbs pull force secures your gear with industrial strength.

MUTUACTOR’s 2-pack super strong neodymium magnets deliver an impressive 185lb pull force each, featuring durable A3 steel protection and a corrosion-resistant triple-layer coating. Designed with a universal 1/4''-20 male threaded stud, these compact 1.65” round magnets are ideal for mounting cameras, LED lights, tools, and equipment across industrial, marine, and everyday environments. Highly rated and trusted by professionals, they combine heavy-duty strength with versatile, easy-to-use mounting solutions.

Specifications

ASIN	B07JKWCVTX
Best Sellers Rank	#14,976 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #121 in Rare Earth Magnets
Brand Name	MUTUACTOR
Color	185 lbs 1/4-20" Male 2pcs
Customer Reviews	4.7 4.7 out of 5 stars (702)
Included Components	Neodymium Pot MagnetsX2
Item Dimensions L x W x Thickness	1.65"L x 1.65"W x 0.31"Th
Item Thickness	0.36 inches
Item Weight	7.04 ounces
Manufacturer	Ningbo Auto-Tech Technology Co., Ltd
Material Type	A3 Iron Steel, Neodymium
Model Number	C42LINCH Magnets
Number of Items	2
Number of Pieces	2
Part Number	MAT-D320090M
Pull Force	185 pounds
Shape	Round
UPC	799445342096
Unit Count	2 Count
Warranty Description	45 days

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€ 40.52

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered 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 Slovakia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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