International Industrial Springs Wagle Estate, Thane, Maharashtra

wave Spring washers as per DIN 137 & DIN 6904. IIS Wave washers are made from prime quality spring steel, stainless steel, copper and other material which are readily available in very standard sizes. Wave washers are wavy metal washers designed to offer a compensating spring force and maintain a load or take up shock. These are the disc of irregular shape formed in such a way that when loaded it deflects, acts like a spring, and provides a preload between two surfaces. Wave washers are very useful for limited radial space and moderate thrust load e.g. Axial loading of Ball bearing.

IIS has all the facilities to handle large volumes of stampings & sheet metal componenents. We have automatic decoilers & feeders & high speed heat treatment furnance for faster production. We can stamp upto thickness of 10mm or 0.4" We have a production capacity of 25MT tons per month for one shift. WE can supply OEM quality stampings with flatness and tolerance on dimension in microns IIS can make stamping from various materials Stainless steel, Carbon Steel, Spring Steel, Precipitated hardened Stainless Steel, High Temperature & other Exotic Materials. We have inhouse tool room to develop urgent tools & dies. We can develop prototypes & samples for your R & D requirements. Our high speed deburring machines help in giving rounded and burr free edges for all type of stampings.

These are generally made of rectangular section material, flat strip, with round edges or normal slit edges with equal or increasing space between coils. These are wound flat to achieve torque. For first 3600, torque delivered per revolution is linear. Therefore, these are generally used for less than 3600 rotational applications. If the these springs are rotated more than one turn the coils will touch each other causing friction leading to erratic loads. They generally have a lug across the I.D. of the spring, which engages a slot in the shaft, over which it works. The I.D. can be made with holes to engage an arbor protrusion or can be made in a special shape to fit over a similar shaped shaft. The outside end can be formed as per customer's requirement.

Power springs also called clock springs store and release energy in the form of torque. These are generally made of rectangular section material or strips, have special retaining holes or bends on both ends and are flat wound. A special type of housing or case is provided to reduce space required and to maintain amount of deflection. Apart from transition coils and coils attached to the arbor, others are solid. With the arbor rotation, solid material becomes active and is wound on the arbor. Since the amount of active material keeps on changing, it becomes very difficult to derive the formula for torque per turn delivered by the spring. IIS manufactures Powers springs from thickness 4.0mm X width 100mm and OD upto 6feet. Springs are manufacture red from spring temper material with hardness ranging from 44 to 48 HRC. We have ready stock of standard thickness of material from 1mm upto 4mm for quick delivery and sampling. General applications are for counterbalance mechanisms, reel returns and rewind devices.

Manufacturer & Exporter of Shims & Supporting ring DIN 988 & Shims & Supporting Ring Din. Our product range also comprises of Disc Springs, Serrated Safety Washers and Belleville Washers - Conical Spring Washer.We Deals with Shims & Supporting ring DIN 988.

Serrated Washers are Disc Springs with Trapezoidal Cross Section on both sides for gripping. lIS serrated safety washers are ready to fit washers to sustain preload and avoid loosening. As the bolt is tightened the serrations crunch into the mating faces and prevents the screw from loosening up due to vibration. Also, the disc shape holds the necessary tension. They are available in various sizes to fit bolts or screws. The diameters for Serrated Washers are matched to screw dimensions. The outer diameter of washer is matched to the head diameter of screw head. This allows using screw and bolt including recessed heads, except countersunk screw.

Serrated Leg Washers are ready to fit washer to sustain preload and avoid loosening. When you tighten the screw, the serrations crunch into the mating faces and prevents the screw from loosening up due to vibrations etc. Also the disc shape supports to hold the necessary tension. They are available in various sizes for Bolts and screws. Serrated Washers are Disc Springs with Trapezoidal Cross Section on both sides for gripping. The diameters for Serrated Washer are matched to screw dimensions. The outer diameter of washer is matched to the head diameter of pan head. This allows using the Serrated Safety Washers with almost every screw and bolt including recessed heads except countersunk screw.   Advantages: Used for high vibration resistance due to positive rib contact Excellent pretensioning Through proper radius selection, no splitting/cracking occurs during tightening The concentric force of the washer eliminates the chances of bending the fastener Extensive application and flexibility International Springs has ready stock of all the sizes of Serrated Safety Washers

Power springs also called clock springs store and release energy in the form of torque.These are generally made of rectangular section material or strips, have special retaining holes or bends on both ends and are flat wound. A special type of housing or case is provided to reduce space required and to maintain amount of deflection.Apart from transition coils and coils attached to the arbor, others are solid. With the arbor rotation, solid material becomes active and is wound on the arbor. Since the amount of active material keeps on changing, it becomes very difficult to derive the formula for torque per turn delivered by the spring.

Hot Coiled Springs are generally used in elevated temperatures, high load applications, in a corrosive environment. The transportation industry, Agriculture implement manufacturers, and construction equipments manufacturers are some of the largest users of the hot coiled springs. Generally springs with bar diameter greater than 12.7mm (0.5 in.) are hot coiled. Bars of carbon or alloy steel are generally used for hot-coiled springs.(Details of material used is below) Since the material is special bar quality, hot coiled springs are rather costly. For most hot-coiled springs, finished hardness requirement is in the range of Rockwell C 44-53. IIS can manufacturer hot coiled springs upto 92mm or 3.62 inch wire diameter and OD 450mm or 17inches. IIS hot coiled springs can be made from peeled & centerless ground bar test for crack in our bar crack detection machine to ensure no failure. All springs are heat treated in calibrated electric furnace with controlled temperature. Automatic Grinders allow excellent surface contact which ensure parallelism and squareness. IIS hot coiled springs initially wound to a greater length than finished length. Then they are pressed one or more times to make the specified length. Since presetting allows supporting greater loads because of residual stresses removal resulting from presetting, most hot coiled springs are preset. Shot Peering is also done on all hot coiled springs manufactured at IIS to increase service life. Magnetic particle inspection can be carried out if required

While designing new machines and equipments, many designers don't provide enough space for functioning of the springs, which results into high cost, close tolerance springs and early failure.   In spite of having different design techniques, materials and manufacturing processes, all kinds of mechanical springs have some common considerations.   A good spring design should consider a lot of other things apart from dimensional and load considerations.   Other areas of considerations are 1. Operating environment in terms of temperature, corrosive environment etc. 2. Frequency of Operations 3. Speed of load 4. Desired spring life. An intelligent designer should consider all the above factors and give better value for money to his customer. Here at IIS we can help you design a variety of springs for almost any type of application to suite you specific needs, Please feel free to contact us.   Springs selection, usage and life cycle Generally, a product designer would like all the components to last the life of the product. Thus it is expected that the life of the spring must be equal or little less than the life of the product for which it is used. Selection of right manufacturer, who have an idea & experience about the problems faced, is very important when a long spring life is required. No spring manufacture can guarantee zero failure in a batch of springs irrespective of time, money and efforts taken to guarantee long life. Spring life depends on many factors, which will eventually add to the cost of springs. The detail test conditions, expected life and failure rate must be clearly defined instead of vague specifications. Intelligent design, right material and tight quality control in material and production process can increase the spring life. Predicting exact spring life has to be done with careful consideration and with manufacturer's consultation.   Material : Deciding the material is a crucial for a spring designer. A List of material used by us to manufacturer springs is available here It is difficult to derive the amount of material required to be used in a spring based on the load vs. deflection requirement. Since Deflection is directly proportional to load, the amount of material required to changes accordingly. Different materials have different tensile strengths, which are used in initial design calculations. The table below shows the approximate tensile strengths.   Costs Vs Tolerances Springs must be produced in a cost effective way because cost is a major factor in today's competitive environment. Therefore generous tolerances must be given to allow manufacturer springs by ordinary methods. It is always better to use tolerances based on functional requirements. This will provide an option to the manufacturer to make the necessary adjustments in the variations in size and properties of material. Tight tolerances reduce the production speed and rejection leading to increased cost both to the manufacturer and the customer.   Burrs : While manufacturing springs, several operations produce burrs. Since burrs are harmless in nature, they are often neglected. Burrs formed after spring end grinding or cutting can sometimes interfere with the normal working of the springs by creating friction in the guides or any parts holding the springs. It is necessary for the manufacturer and the customer agree on the limits of the burr based on the spring design and working.   Hydrogen Embrittlement : Hydrogen gets absorbed into material when carbon steel is pickled for electroplating process preparation. This leads to early failure of springs at lower tensile stress even under short cycle tests. Many times the cracks develop in pickling or plating bath but appear only after plating or sometime when the plated springs are in use. The risk of Hydrogen embrittlement is more when material is subjected to high stress, is with high Rockwell Hardness and has high carbon content. At equal hardness level, tempered carbon steel has more chances of hydrogen embrittlement than cold drawn carbon steel. Hydrogen embrittlement cannot be checked quickly or detected by a testing method. Scragging the springs up to the maximum working load or up to the solid height for a long period can surface any cracks cause due to hydrogen embrittlement. To avoid failure due to hydrogen embrittlement it is important to bake the spring immediately after plating to drive the hydrogen out of the material  

Belleville washer in imperial as well as metric sizes. Belleville washers also called conical spring washers are manufactured as per DIN 6796 and are designed specifically for Heavy Duty Bolted section such as Bus Bars, Transformers, Rectifiers, Heat Exchangers, Transmission etc. These washers are intended to counteract the effect of setting which results in boltnut assemblies working loose. They do not effectively prevent loosening of the assembly under varying radial load and are designed for use with short bolts predominantly subject to thrust.

Belleville washers are high stressed components and cannot be used for dynamic loading and infrequent varying load applications. The force give in the table below is approximate.

Wave Washer for Bearings are as per DIN 137 & DIN 6904. Wave Washer for Bearings are made from prime Quality Spring Steel. Stainless Steel and Copper are also available in standard sizes. Wave Washers are positioned underneath a nut, an axle bearing or a joint, to reduce friction, avoid leakage, isolate, stop loosening or distribute pressure.