Product Order Line: 01527 521000
Minimum order charge for UK customers: Orders are subject to a minimum charge of £15 plus carriage, packing & VAT.
Minimum order charge for Overseas customers: Orders are subject to a minimum order charge of £50 Pound Sterling ($100 US Dollars) on an ex-works basis.
Choose from the selection of wire diameters on the right ----»
Or... input your specifications to our recently added compression springs database to locate the spring that matches your requirement.
Open-coiled round wire helical compression springs
These are the most common type of spring and we are the leading UK spring manufacturer, and stockist, supplying top quality springs at very competitive prices. From production runs of millions of compression springs to unique 'one-offs', our company philosophy is that no order is too small or too large.
Supplying the best quality springs is always our goal
Our team of engineers and quality control personnel monitor each stage of the production of compression springs, using both computer and manual SPC systems, to ensure that this aim is achieved.
We offer a special manufacturing service if you cannot locate a compression spring in the size you require and contact us if you require imperial sizes.
Assorted Boxes of Compression Springs
Buy online... assorted imperial and assorted metric compression springs.
Information for students and graduates.
We are starting to locate and collate a list of educational resources which we feel would be very useful to budding engineers and springmakers alike.
Please contact us if you are aware of an excellent educational web page or site about compression springs and feel it should be included in the list below.
Coil Spring Terminology
Wikipedia: Coil Springs
Wikipedia: Compression Springs
Compression Springs
Compression Spring Formula.
In a spring, which has its coils spaced uniformly and is compressed by pressure applied to its ends, all the adjacent coils will approach each other equally, because all are subjected to the same pressure and all have the same resistance to that pressure.
Consequently, as a spring is compressed, the load increases in a linear manner and the strength of a spring is expressed as the load obtained from one inch of deflection (rate per inch). In fact, for approximately the last 15% of the total deflection of spring, the rate becomes non-linear due to the active coil at each end of the spring closing up and becoming inactive.
The formula for calculation of rate is:
G=Modulus of rigidity (11.5 x 106 for carbon steel)
d=Wire diameter
n=Number of working coils
D=Mean diameter of coils
Another important factor in design is the stress which the spring can withstand without taking a permanent set.
Generally speaking, this should not exceed 80,000 pounds per square inch (for carbon steel) although various manufacturing techniques and the use of special materials can, in certain circumstances, make practical the design of springs with stresses in excess of this figure.
The formula for the calculation of stress is:
W=Load
D=Mean diameter of coils
K=4C+2 over 4C-3
C=Spring index (D over d)
d=Wire diameter
K represents the WAHL factor which corrects the formula in respect of the increased stress on the wire at the inside diameter of the spring.
