DIN 137 (A) Curved spring washers DIN 137 (A) - 1987
| Product Name: | Curved spring washers DIN 137 (A) - 1987 | |
| Standard: | DIN 137 (A) - 1987 |  |
| Material: | Carbon steel and stainless steel | |
| Size: | Reference standards and according to customer requirements | |
| Finished: | Zinc Plated,Hot Dip Galvanized Steel,Dacromet,Nickel Plated,Black Oxide,Plain | |
| Delivery time: | Normally in 30-40 days. | |
| Thread Position | / | Thread Type: | / |
| Internal Driving: | / | External Driving: | / |
| Locking Type: | / | Shank: | / |
| Point: | / | Mark: | As required |
About Washers
Types of Washers
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Flat washers are primarily used to displace the load of a fastener head or a nut on a threaded joint. They can cover holes and act as spacers.
Lock washers resist vibration to prevent a threaded joint from loosening.
Cushioning washers protect joints and dampen vibration.
Sealing washers prevent fluids from leaking around connectors.
Countersunk washers give flat and oval head screws a neat, finished appearance.
Sleeve washers act as a barrier around fasteners to block electrical current and prevent corrosion from mating different material.
Square-neck bolt washers have teeth to dig into soft material to prevent rotation.
Leveling and wave washers compensate for tolerance variations and uneven surfaces.
Washers for blind rivets are also known as backup washers and are for use with blind rivets for extra support when fastening into soft material.
Notched washers have indentations for temporarily securing them with nails to keep them from rotating during installation. They have large ODs to prevent screws from sinking into wood surfaces.
Curved washers are designed to fit round surfaces such as tubes and pipe.
Slotted washers allow you to install and remove them without completely disassembling your joints.
Washers for tie-down straps have bent sides that are good for holding and aligning tie-down straps.
Washers for electrical terminals prevent wires under screw heads from slipping out so electrical connections stay intact.
Washers for foam insulation and plaster are used to repair foam insulation and sagging, cracked plaster.
Clipped washers fit where standard flat washers can't and won't rotate when you position the flat edge against a surface.
Comparing Washer Materials and Coatings
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The addition of a finish increases the corrosion resistance of the materials shown above.
Black Oxide—This finish gives mild corrosion resistance in dry environments.
Zinc and Zinc Yellow-Chromate Plated—These finishes provide corrosion resistance in wet environments.
Hot-Dipped Galvanized—This finish has 10 times more corrosion resistance than zinc and zinc yellow-chromate platings.
Cadmium Plated—This finish resists corrosion from salt water.
Passivated—This finish adds another level of corrosion resistance to stainless steel.
Zinc-Aluminum Coated—Also known as armor coat and ultra coat, this coating resists corrosion from chemicals and passes the 1,000-hour salt-spray test.
Black Ultra-Corrosion-Resistant Coated—This durable semigloss coating resists corrosion from acids and chemicals and passes the 1,000-hour salt-spray test.
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Q1.
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Who are we?
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A1:
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We are based in Ningbo, China, starting in 2009, and sell to North America, Oceania, Domestic Market, Eastern Europe, Southeast
Asia, South America, Africa, and the Middle East. We have professional teams doing development, manufacturing, quality control and service management. |
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Q2.
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How can we guarantee quality?
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A2:
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Always take a pre-production sample before mass production. Always complete an inspection before shipment.
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Q3.
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What can you buy from us?
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A3:
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Fasteners: screws, bolts, nuts, washers, some CNC parts
Solar hardware: Solar Mounting Racks, Solar Mounting Accessories, Cable Clips, and ABS Solar Mounting Brackets. |
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Q4:
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Why should you buy from us, not from other suppliers?
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A4:
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Sokun is a professional manufacturer specializing in research, development, manufacture, and servicing of solar mounting systems.Since founding in 2009, we have professionally designed products to handle all systems as well as to ship goods in a timelymanner.
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Q5.
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What is your payment method?
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A5:
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30% value of T/T in advance and other 70% balance on B/L copy. For small order less than 1000USD, would suggest you pay 100% in advance to reduce the bank charges.
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