An extension spring (also called a tension spring, referred to as a tension spring) is a helical spring that bears axial tension, and extension springs are generally made of circular section materials. When not under load, the coils of the tension spring are generally tight and there is no gap between the coils.
Introduction
The circles are tightly surrounded so that they can be stretched by force, and each end is wrapped around a loop (Loop).
The following is the necessary information for a tension spring:
(1) Free length: (a) total length, (b) total loop length, (c) length from inside the hook loop.
(2) Control diameter: (a) outer diameter, (b) inner diameter, (c) inner diameter of the casing.
(3) The wire size "wire diameter".
(4) Materials (type, grade).
(5) Number of turns: (a) total turns and (b) right-hand or left-hand.
(6) The form of the end.
(7) Load in the hook.
(8) Load rate, deflection, pounds per inch.
(9) Maximum stretch length.
