How much weight can this support?

The Petzl ascension is certified to the EN 567 standard that says 4kN (900lbs) static load without destroying the device or rope. The key is static load. The device can withstand higher static loads to about 6kN (1350lbs), but any dynamic load applied from 4kN (900lbs) to 6kN even for a millionth of a second will eat your rope to shreds. The general rule is toothed cam devices eat rope at 4kN (900lbs), so don't use it as a rope grab, fall arrester, or progress capture unless you really know what your doing. The EN12841 type B standard tests show that it will handle dynamic loads over 4kN (900lbs), but it becomes very depended on what type / age of rope is used. Its a hand ascender for body weight (static loads), if your using it for something else consider another device.

Is this a practical solution for hanging my kids' rope swing to make it easily height-adjustable? Indoor use. 10.5 mm static rope.

No it's intention is too ascend rope, I see what your thinking but eventually the rope its hanging unto not the actual swings rope but what its holding would fail from being used in a fixed position.

What diameter rope is this for? ca i use it with 12-strand arborist climbing rope, 1/2" by 150' blue ox rope?

It will accept 8mm to 13mm rope - Arborist rope will be fine.

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Color	Yellow
Material	Metal
Brand	PETZL
Item Weight	0.46 Pounds
Recommended Uses For Product	Klettern
Shape	D-Shape
Unit Count	1.0 Count
Lock Type	Spring Loaded Lock
Product Dimensions	11.81"L x 7.87"W
Global Trade Identification Number	03342540100404
Manufacturer	PETZL
Item Package Dimensions L x W x H	8.58 x 3.7 x 1.42 inches
Package Weight	0.21 Kilograms
Item Dimensions LxWxH	11.81 x 7.87 x 5.91 inches
Brand Name	PETZL
Model Name	Ascension
Suggested Users	mens, unisex-adult, womens
Number of Items	1
Part Number	B17ARA
Model Year	2017
Included Components	Rope Clamp
Size	Right
Sport Type	Klettern
Hand Orientation	Right

PETZL(ペツル) B17ARA アッセンション R [並行輸入品]

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