Though generally called a square collar, this very useful part will normally be used as a Bearing Block for standard Meccano Axles.
Made from Solid Brass 1/2" square and 5/16" thick (12mm x 7mm) 4.1 mm bore and 4 threaded holes on sides.

Threads can be Meccano 5 /32" or 4mm (m4), please choose option 

Made in the UK

 

Square Collar (bearing)

SKU: bp14
£1.85Price
Option