This blog is a comparison between the most common hook styles, machine hooks and side loops.
Custom Manufactured Extension Springs
Extension Spring Design Technical Information Custom and Stock
Extension Spring Hook Styles: Machine Hooks vs. Side Loops
Tension Spring Manufacturers Extension Springs from Airedale
Understanding Spring End Options - WB Jones
Industrial Spring Corporation Extension Spring Technical
Extension Springs and Compressions Springs
Tension Springs Supplier & Custom Extension Springs Manufacturer
Extension springs - Varianti Ltd
Industrial Spring Corporation Extension Spring Technical
SPEC Standard Extension Springs
Extension Spring Hook Styles: Machine Hooks vs. Side Loops