Washers Flat/Spring Washers
DIN125 Flat Washer
Flat washers are used to increase the bearing surface of a nut or fastener’s head thus spreading the clamping force over a larger area. They can be useful when working with soft materials and oversized or irregular shaped holes.
Washer size refers to its nominal hole size and is based on screw size. Its outside diameter (OD) is always larger. Size and OD are usually specified in fractional inches, although decimal inches may be used instead. Thickness is typically listed in decimal inches although we often convert it to fractional inches for convenience.
Grade 2 flat washers should only be used with Grade 2 hex cap screws (hex bolts)—use hardened flat washers with Grade 5 and 8 cap screws. Because Grade 2 flat washers are made of soft, low carbon steel, they will “yield” (compress, cup, bend, etc.) under the higher torque values normally associated with Grade 5 and 8 cap screws. As a result, there will be a reduction in clamping force as the washer yields.
Flat washers are commonly available in a variety of materials including aluminum, brass, nylon, silicon bronze, stainless steel and steel. Unplated or uncoated steel, referred to as “plain finish,” has not been surface treated to prevent rust other than a light coating of oil for temporary protection. Consequently, common finishes for steel are zinc plating and hot dip galvanizing.
Through their design, the distribution property of plain washers can prevent any sort of damage to the assembled surfaces. Flat washer has a thin and flat surface with a hole in the centre. This type of washer provides support to a smaller head screw.
Black-oxide steel washers are mildly corrosion resistant in dry environments. Zinc-plated steel washers resist corrosion in wet environments. Black ultra-corrosion-resistant-coated steel washers resist chemicals and withstand 1,000 hours of salt spray.
A ring split at one point and bent into a helical shape. This causes the washer to exert a spring force between the fastener’s head and the substrate, which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to rotation. Applicable standards are ASME B18.21.1, DIN 127 B, and United States Military Standard NASM 35338 (formerly MS 35338 and AN-935).
Spring washers are a left hand helix and allow the thread to be tightened in a right hand direction only, i.e. a clockwise direction. When a left hand turning motion is applied, the raised edge bites into the underside of the bolt or nut and the part that it is bolted to, thus resisting turning. Therefore, spring washers are ineffective on left hand threads and hardened surfaces. Also, they are not to be used in conjunction with a flat washer under the spring washer, as this isolates the spring washer from biting into the component that will resist turning.
The benefit of spring lock washers lies in the trapezoidal shape of the washer. When compressed to loads near the proof strength of the bolt, it will twist and flatten. This reduces the spring rate of the bolted joint which allows it to maintain more force under the same vibration levels. This prevents loosening.
The spring washer prevents nuts and bolts from turning, slipping and coming loose because of vibration and torque. Different spring washers perform this function in slightly different ways, but the basic concept is to hold the nut and bolt in place. Some spring washers achieve this function by biting into the base material (bolt) and the nut with their ends.
Spring washers are commonly used in applications involving vibration and possible slippage of fasteners. Industries that commonly use spring washers are transportation related (automotive, aircraft, marine). Spring washers may also be used in household appliances such as air handlers and clothes washers (washing machines).
|Product Detail||Hot Sale DIN 127 Spring Washer|
|Appearance||Bright,Neat,Shiny||Quality Control||Qualificaiton of 98%|
|Specification||M2.5-M64||Grade||carbon 4,8,10 Grade|
|Pallet Size||Standard||Heat Treatment||Tempering,Hardening,Stress Relieving,etc.|
|Carton Size||25cmx25cmx13cm||Packing||Regular and Strong Packing|
|Lead Time||15 Working Days||Warranty||100%|
|Available Finish||Blue white zinc,Black zinc,Yellow zinc,Bright zinc,Black oxide,Dacromet,Nickel Plated,chrome plated ,etc.|
|Applicable Scope||Transportation Facilities,Electro-mechanical Equipment,Building,Automotive Industry,Machine,etc.|
1. 50kg or 25kg bags + pallet(selectable)
2. 25kg carton + pallet ( selectable)
3. Logo is customizable on bag/carton.
4. In Bulk.
1. Could you send me all your catalogue and price list?
As we have more than thousands of models, it is really very hard for us to send you all catalogue and price list for you. Please inform us the detail sizes you are interested in so that we can offer your the models and price list you want.
2. What’s your delivery time?
In generally, the delivery time
standard parts 15-20days
non-standard parts 20-35days
We will make the delivery as soon as possible with the guaranted quality.
3. What is the convenient way to pay?
Dear buyers,we are insisting on providing our customers the best service we can offer
L/C, T/T, West Union are accepted.
4. Can you send me free samples?
yes, of course. we can send customers free samples and customers should pay the freight.
At first ,we promise the good quality of our products.
Second, we want to build friendly and long term business relationship with each customers.
At last, we hope to be your partner ,not just customer.
2.100% tested before each shipment
3.Quickly shipping arrangement
5.BL.Packing list,commercial invoice or other documents will be sent soon