How strong are these compared to welding?

Depends on how heavy the product that you are exposing the connectors to/which to design? these connectors are an extremely tight fit when using 25x25x1.2mm Box Section (usually around 150-200kg load)

What are the dimensions....I want to build a square frame with the third connector acting as a leg to stand off some tiles

to suit 25x25x1.2mm square tubing

iam building a chair will these be srong enough to hold 2 people

Yes I built a stand in my shed and I'm 26stone and I stand on it regularly

Are the connectors easy to remove, so anything you build can be dismantled.

They are not designed to assemble and dissemble many times (the plastic is a very tight fit. you will shav a layer of plastic off each time if you dissemble and reassemble so the connectors will become lose over time).

ASIN	B00M0RN17A
Best Sellers Rank	672,134 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,707 in Furniture Castors
Customer Reviews	4.7 4.7 out of 5 stars (14)
Date First Available	22 July 2014
Item Package Quantity	1
Item Weight	138 g
Item model number	3W
Manufacturer	Ross Castors
Material	Metal, Plastic
Part number	3W
Product Dimensions	2.5 x 2.5 x 2.5 cm; 138 g
Shape	Corner Unit

Square Tube Connectors by Ross Castors Heavy Duty for Metal Tube 3 Way (25 x 25mm)

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Specifications

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