This wouldn't hold my 5.6lb canon t5i, rokinon 135mm f2 lens, battery grip, and guide scope. i couldn't turn the knob tight enough, i had arca swiss?

I just checked my ULANZI ball head and when I tightened down the tension knob I could not move the ball even by pushing on it very hard from several angles. I then mounted my Nikon D500 with my 70-200 f4 zoom and when tightened, the ball head did not move. Perhaps you have a defective ball head as mine works as it should and is very stable.

Can you mount any camera to this? i don't know a lot about photography. looking to use this for a sony ev-10.

You can definitely use this ball head and mount for the Sony ev-10; I use this Ulanzi quick release with several different cameras [sony and canon], including the zv-10.

What is the exact screw size? A 1/4 inch what? 1/4-20? How many threads per inch? I need this screw to thread into a blind nut so need the size thread

The thread size is 1/4-20, which means 20 threads per inch. Home Depot would have plenty of those nuts!

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Upgrade ULANZI Claw Quick Release QR Plate Kit, Quick Release Plate Rapid Connect Adapter for DSLR/Mirrorless Cameras, Tripod, Monopod, Slider, Handheld Gimbal, Stabilizer, Ball Head

Product ID: 280465718

Details

Brand
jusmo
Color
Claw QR Plate
Compatible Devices
Camera
Item Weight
2.08 ounces
Product Dimensions
1.85"D x x
UPC
782902326265

🔄Rapid quick-release system

⚙️110 lbs load capacity

🛠️Aluminum alloy build

Upgrade ULANZI Claw Quick Release QR Plate Kit, Quick Release Plate Rapid Connect Adapter for DSLR/Mirrorless Cameras, Tripod, Monopod, Slider, Handheld Gimbal, Stabilizer, Ball Head

Product ID: 280465718

Details

Brand
jusmo
Color
Claw QR Plate
Compatible Devices
Camera
Item Weight
2.08 ounces
Product Dimensions
1.85"D x x
UPC
782902326265

🔄Rapid quick-release system

⚙️110 lbs load capacity

🛠️Aluminum alloy build

Description

⚡️ Unlock Pro-Level Speed & Stability in Every Shot!

SAFETY FIRST SLIDE LOCK - Secondary locking mechanism ensures your gear stays secure—no accidental drops.
UNIVERSAL COMPATIBILITY - Arca interface + multiple 1/4” screw holes for seamless connection to tripods, gimbals, sliders, and more.
EFFORTLESS RAPID SWAPPING - Switch cameras and mounts in seconds—no screws, no hassle.
ERGONOMIC ACCESSIBLE DESIGN - One-handed operation perfect for professionals and users with limited hand strength.
ULTRA DURABLE YET LIGHTWEIGHT - Solid aluminum alloy weighing just 0.13 lbs but supporting up to 110 lbs load.

The Upgrade ULANZI Claw Quick Release QR Plate Kit revolutionizes camera mounting with a lightweight yet ultra-strong aluminum alloy design supporting up to 110 lbs. Featuring a rapid-release claw system and Arca-compatible base, it enables seamless, tool-free switching between DSLR, mirrorless cameras, tripods, gimbals, and sliders. Enhanced with a secondary slide lock for maximum safety and multiple 1/4” screw holes for versatile mounting, this kit is engineered for professionals demanding speed, stability, and ergonomic ease—even for users with limited hand dexterity.

Specifications

ASIN	B08TQ8CSRR
Best Sellers Rank	#4,245 in Camera Mounts & Clamps
Brand	jusmo
Color	Claw QR Plate Kit
Compatible Devices	Camera
Customer Reviews	4.7 4.7 out of 5 stars (225)
Item Dimensions D x W x H	1.85"D x 1.57"W x 1.06"H
Item Weight	2.08 ounces
Manufacturer	JUSMO
Maximum Weight Recommendation	20 kg
Media Type	ProductImage
Screen Size	1.06 inches
UPC	782902326265
Water Resistance Level	Not Water Resistant

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