These plated steel extension springs measure 8-7/8" long (counting loops) x 7/8" dia x 1/8". Loops are approx 5/8" ID. Rated for just under a 20-lb working load. Good for screen doors and cabinets, and for hanging things that you like to see bounce in the wind.
Your ordinary generic everyday plain old steel hinge measures 2" long x 1-1/2" wide when open with a 1/8" axle and mounting holes just a hair under 1/4". Comes with screws, as they will. Ordinary, yes, but necessary.
These 2-1/2" wide spring-loaded steel hinges have a 3-3/4" long plate with (4) 3/16” mounting holes and another 2” long plate with (2) 3/16” mounting holes. Open to approx 300 degrees. The spring keeps them in the open position and we believe they were made for luggage compartment doors on a plane or train (sorry, not an automobile). Yes, you could remove the springs.
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In addition to this fabulous on-line catalog of incredible stuff, American Science & Surplus has three great retail locations. If you're in the neighborhood, please stop by! Store hours may vary. Feel free to call for store hours and directions.