Page 3 is your spring’s full analysis. This includes all of your spring’s dimensions and working load capacities. You will find the suggested part number which includes such spring’s physical dimensions, rates and loads, safe travel, physical dimensions, material type, weights and measures, stress factors, the possible working loads, and the closest spring in stock once again. Some of these terms may confuse you and you may wonder why they’re there and how they will help you.
The “Rates and Loads” sections will give you your spring’s rate which will help you calculate your spring’s working loads. Find the formulas to of this spring calculation here. The load (torque for torsion springs”) values are the safe loads before your spring takes a set. The real-time value is the one that says maximum load considering solid height (considering hook stress for extension springs).
The “Safe Travel” section does the same as the “Loads” section except it is referring to your spring’s deflection capacity. Again, the real-time value is the one that considers solid height/hook stress.
When it comes to the “Physical Dimensions” section, you will find the same dimensions you entered plus a few others like mean diameter or spring index. The mean diameter is the diameter between the outer and inner diameters; measured from the center of the wire to the next center of wire. The spring index defines the tightness of your spring’s coils which is a great manufacturing and cost factor so make sure it isn’t below 4 or above 15 (although we are capable of manufacturing springs with a spring index up to 30).
For compression springs, other dimensions provided are the solid height, the distance between the coils (pitch), and the number of total coils which depends on the active coils you entered and the end type.
For extension springs, the additional dimensions provided are the hook gap/length, the total coils, and the body length which is calculated from the length inside hooks, the hook type, and the hook length. The total coils of an extension spring are calculated from the body length and the wire diameter.
Last but not least, for torsional springs, the additional dimensions are the body length and the total leg length.
Next, you have the “Material Type” section which simply shows your spring’s material type.
The “Weights & Measures” section will tell you the weight of one spring, the weight per thousand, and the length of wire required to make one spring. These values are important for the manufacturer to know how much material is needed to complete the job per the quantity you requested.
Lastly, the “Stress Factors” section gives you the stress factors of your spring design. These are listed as Material Shear Modulus, Maximum Shear Stress Possible, and the Wahl Correction Factor. These values were used to calculate the maximum safe deflection and force/torque values.