Delivery Time:Up to quantity
Certification:ISO 9001:2008 TS 16949,ROHS

Construction Overhead Garage Door Springs 90MM Outside Diameter HRC 38-40 Hardness

Specifications:

Material	Spring steel
Wire diameter	6.5mm
Outside diameter	90mm
Total coils	70
Active coils	70
Direction	Right/left
Hardness	HRC 38-40
Surface treatment	oiled
Load type	torsion
Style	cylinder
Usage	overhead garage door,construction

Description:      

garage door springs counterbalance the weight of the door to make it easy to open and close. They serve the same purpose of counter weights used to balance doors in centuries past and in many doors today.

the length of garge door springs,exactly speaking,the number of coils is one of the main factors to determine the spring rate of garage door torsion spring,or the torque of torsion spring in other words,so we add a process to adjust number of coils specially with cutting by punch and make sure each spring have the same coils with drawing.

when torsion springs are wound, they grow in length. Since both ends of the torsion springs on steel rolling doors are secured and cannot move, the spring cannot grow in length. There are two options for fixing this problem. You can stretch the spring yourself with a come-a-long before you secure it to the shaft, or your can purchase pre-stretched springs. This allows the coils to be gapped and to lose most of this gapping when the door closes.

Applications:

The torsion springs on steel rolling doors work the same way as other torsion springs in the garage door industry. When the door is closed, the spring is wound. The spring is secured to a spring anchor bracket on one end and to the shaft on the other. When the steel rolling door opens, the spring in the barrel supports most of the door weight. The remainder of this weight is lifted by the chain hoist or the operator.

applications of our torsion springs:

Residential sectional garage doors Commerial sectional overhead doors Industry shutter doors One-piece curtain doors mini-warehouse doors Self-storage doors Roll-up doors

 How to order your garage door springs

For quotation,we need info of your torsion spring as follow:

Inside diameter Wire size Length Type of spring ends Gapped or ungapped

And before production,we will make drawing to let you confirm.