Precision Disc Springs - MW Industries, Inc.

1 PrecisionDisc SpringsSLOTTEDSERRATEDFLATCONTACTBALL BEARING : 410-391-7400 Custom and Catalog Products. One Source. DISCBELLEVILLE About MW Industries, Industries, Inc. MW Industries, Inc. (MWI) is comprised of 15 locations and is headquartered in Rosemont, Illinois. It is the largest, most diversified specialty spring and fastener manufacturer in the United States. Through decades of growth, innovation, and dedication, MWI is a world-class supplier of Springs , fasteners, and metal stampings from spring -tempered materials. Throughout our 70 year tradition, it has been our goal to deliver the highest quality, most technologically innovative, and durable products in the marketplace.

2 MWI is committed to excellence in quality at each phase of the product life cycle from design and engineering to manufacturing and in every interaction with our customers. We empower innovation. We engineer Precision spring (MPS) Baltimore, MDMaryland Precision spring (MPS) Baltimore, MD Maryland Precision spring , a MWI location, is a leading manufacturer of Belleville disc Springs with an extensive inventory and custom manufacturing capabilities. For forty years, MPS has been serving a range of industries including aerospace, transportation, machining, and merging of National disc spring brand and Rolex spring brand into MPS insures continuation of the selection, quality and value that you have come to expect, allowing for a streamlined manufacturing process, optimized system performance and providing ultimate quality control.

3 Our products are manufactured with a well-trained and experienced workforce and are supported with strong customer service experience. MPS services include: Custom disc spring Manufacturing Complete engineering and manufacturing support for custom Belleville disc Springs from concept to finished product. Custom Services Product assembly and packaging services including stacking are available to all customers. Large Inventory & Stock A large disc spring inventory and stocking programs for just-in-time delivery requirements. Quality Standards MPS is ISO 9001:2008 certified. RoHS compliant product is available on request.

4 All disc spring products are manufactured in the of Contents Introduction to disc Springs ..2 Engineering & Design Information disc spring Load Calculation ..3 Theoretical vs. Measured Characteristics ..4 Special Cases of h/t ..4 disc spring at Flat ..5 Dynamic Loading & Fatigue Life ..6 disc spring Stress Calculations ..7-8 disc spring Stacks ..9 disc spring Materials: Chemical/Physical Properties ..10 Suggested Tightening Torque ..11 Products AM disc Springs ..12-16 AI disc Springs (sized for bolts) ..17-20SP Series disc Springs (for heavy bolted sections) ..21 Stainless Steel Flat Washers ..21 FL & MFL Series Flange disc Springs .

5 22 NDS Series Flange disc Springs ..23 AK (Ball Bearing) Series disc Springs ..24-25 Custom disc Springs ..25 Applications & Markets for disc Springs ..27-28 Request for Quote ..29 2 Need a custom product? Call us at 410-391-7400! P: 410-391-7400 F: Introduction to disc Springs disc Springs , also known as Belleville Washers and Belleville Springs , are discs with a slight cone shape, that deform to a shorter height when subjected to a load along their axis of symmetry. This elastic deformation characterizes the spring action. MW Industries disc spring fabrication is subject to exacting manufacturing and quality control standards.

6 Materials used are generally in the annealed condition and hardened to within a range of Rc 44-51 depending on the material thickness. When required, disc Springs are preset so that they will not significantly relax under load over time. disc Springs can be a good design solution where the load required is high and the space available is limited. They can be tailored to provide loading profiles that are not feasible with coiled Springs . disc Springs are used singly or in stacks to achieve a desired load and travel. Our disc Springs are commonly used in high temperature/extreme pressure applications, pipe flange applications, bolted joint applications, heavy and light bolting applications, dynamic applications and bearing preloaded washer applications.

7 MWI disc Springs MWI offers an extensive listing of catalog parts that have been designed to perform in specific situations. Our catalog disc spring series include: AM disc Springs Precision steel Belleville disc Springs designed for dynamic loading AI disc Springs steel Belleville disc Springs for light bolted assemblies, sized for standard bolt sizes Contact disc Springs for improved bolt connection applications, compensates for developed looseness, loss of bolt tension due to applied surface deterioration, or movement due to thermal changes SP Series disc Springs for heavy bolted applications with a need to overcome thermal expansion and contraction.

8 And stainless steel options for corrosion resistance FL & MFL Series Flange disc Springs elastic mechanical elements designed primarily for pipe flange applications NDS Series Flange disc Springs maintain tension and pressure around a flange especially under thermal variations or mechanical shock Springs for Ball Bearings especially designed for preloading Springs used with radial ball bearings Custom disc Springs contact us if you need something and do not see it in the catalog Materials Maryland Precision spring stocks Belleville disc Springs made from C1075 high carbon steel or C6150 Alloy steel. These disc Springs can be finished with a variety of different platings to provide additional corrosion resistance.

9 Stainless steel Springs are also available for environments where corrosion resistance is critical. Inconel or H13 alloy Springs can be provided for high temperature applications. Other materials are available for special applications. Need a custom product? Call us at 410-391-7400! 3P: 410-391-7400F: Engineering & Design Information MPS uses a proprietary design software program that enables our team of engineers to quickly design custom disc spring systems based on our customers specific applications. Contact our disc spring team for additional information, including design assistance. disc spring Load Calculations When referring to Bellville disc spring design, certain aAKreviations are helpful: OD = Maximum outside diameter (upper surface) ID = Minimum inside diameter (bottom surface) h = Conical disc height (cone height) OH = Overall height = t + h t = Actual thickness of disc = Cone angle of disc R = Radius from centerline to load bearing circle (bottom surface) M = Ratio factor = Poisson s ratio (.)

10 3 for steel) E = Young s modulus (30,000,000 for steel) f = Deflection of disc = Ratio of diameters (OD/ID) P = Load in pounds at a given deflection Pf = Load in pounds at flat X = Sin t Y = Cos t 4 Need a custom product? Call us at 410-391-7400! P: 410-391-7400 F: Engineering & Design Information Theoretical vs. Measured Characteristic of a disc spring The shape of Belleville disc Springs make accurately predicting their performance a challenge. The design information that follows offers good results for most parts that fit within the following parameters: Ratio of diameters = OD/ID between and Ratio of cone height to thickness = h/t between and Ratio of diameter to thickness = D/t between 16 and 40 Belleville disc Springs should be designed to work within the range of 20% to 80% of their total available deflection to avoid premature fatigue failure.