Month: July 2015

Copper Flat Washer Specifications

A copper flat washer is a thin, disk-shaped plate, featuring a hole in the middle, which is used to disburse the weight of a threaded fastener, either a screw or a nut.

Copper Flat Washers

This copper piece is also used as a belleville washer, wave washer, spacer, wear pad locking device, preload indicating device and is also used to reduce the vibration. Its outer diameter is twice the width of its inner diameter.

A washer usually comes in three types: plain or flat washers, spring washers and locking washers. A copper flat washer distributes the load, thereby eliminating the damage to the surface. It is also used to render some sort of caulking or electrical insulation.

The spring washers, which feature axial flexibility, are used to prevent from fasteners getting loosen due to vibrations. The locking washers are also used to prevent the loosening of the fasteners by eliminating unscrewing rotation of the device.

various Types of Copper Flat Washers

The ANSI (American National Standards Institute) has given a standardization for the the flat washers. They can be summarized as

  • Form A = Normal Diameter, Normal Thickness
  • Form B = Normal Diameter, Light Thickness
  • Form C = Large Diameter, Normal Thickness
  • Form D = Large Diameter, Light Thickness
  • Forms E to G relate to Black Metal Washers

ANSI Standards of Flat Washers

The fastener companies use nuts, bolts and screws to fasten various objects. The manufacturers make use of flat washers, as they help builders screw nuts into big holes. These are available in several varieties, categorized under coating, size and material composition.

The highest quality washers are normal used in bolted joints, mainly due to the amount of the pressure the bold joints exert.


Detail Picture of Flat Washer



The copper flat washers are thin circular plates, which are specially designed to match with various types of nuts, according to Mutual Screw, a well-known fastener online dealer.

The washer normally goes through the longer part of the screw or bolt and creates a blockade between the device in contact with the nut and the head of the nut.

Clear Picture of Flat washer Usage spots

The builders also use these small circular plates when they are working with holes larger than the nut itself.


The width of a flat copper washer usually ranges from 3/16″ to 1/4″, although there are some specialized thicker washers, which are as thick as 1″ as per the ANSI. These specialized washers eliminate the risk of cupping, which occurs when the bolt gets into the object.

Thickness Diagram of Flat washers

Metallic Composition

These are available in various sizes and materials. The most commonly used are made up of copper, as these have high tensile strength. These pieces are also available in other materials as well, such as nickel-chromium-molybdenum, silicon-manganese, chromium, chromium-vanadium as per Global Spec.

Even these are available in titanium as this material is cheaper and is durable enough to enable stronger flat washers.

Technical Specifications of Different Flat Washers

Technical Specification

  • Item: USS Washer
  • Type: USS
  • Material: Steel HV-140
  • Hardness: HV 140 – 250
  • Finish: Copper
  • Fits Bolt Sizes: 1/4″
  • Inside Diameter: 5/16″
  • Outside Diameter: 3/4″
  • Thickness: 1/16″
  • Thickness Tolerance: 0.051-0.08″
  • Color: Silver
  • Application: Bearing Surface for Fasteners and Fixtures
  • For Use: With Screws and Bolts
  • Meets/Exceeds: ANSI B18.22.1

Metric Standard Flat Washer Technical specifications

Non-metallic Composition

The flat washers are also available in non-metallic materials as well. The manufacturers use polyester to create high tensile strength and this material also helps in enabling the washers wrinkle and abrasion resistant.

Poly-carbonate is also used, which features opacity and renders abundant strength. Sometimes, the acetyl materials are also molded to manufacture washers, s they have inherent lubricity and are highly chemical resistant.

Washers Used in a Machine

Other non-metallic usable materials include leather, nylon, ABS, rubber, asbestos, felt, polyethylene, Polyvinyl Chloride etc.


Manufacturers add various types of finishes to these types of fasteners. They create an anodize coating by oxidizing the aluminium surface of the device, thereby creating an oxide coating. This coating acts as a shield for the flat washer. The scientists also glavanize steel and iron along-with molten zinc, so as to increase the washer’s service life.

Flat Washer finishes

The flat washers are also available in other finishes, such as nickel, tin, zinc chromate, black oxide, zinc and phosphate.

Where to Buy

Copper Flat washers in various sizes

Zip-it Anchors and Hollow Walls Make a Great Team

If you need to hang any item on a hollow or thin wall, a traditional nail or screw may be ineffective. Hollow surfaces aren’t very sturdy, especially if there aren’t studs for the fasteners to grip onto. On a weak wall or ceiling, standard nails and screws can pull away easily. To avoid this problem, it’s best to use a zip-it anchor. Zip-it anchors have threads, so they twist easily into a thin surface. Once the anchor is screwed in, it spreads open so that it cannot be pulled out. You can use these fasteners on wallboard and drywall, and they’re ideal for medium to light loads. Picture frames, paintings, curtain rods, small mirrors and utility organizers are all perfect candidates for threaded anchors. A zip-it anchor is self-drilling, which means you don’t have to drill any holes prior to installation. You can purchase the anchors in nylon or alloy materials, and you’ll find selections for working with various screws. If you have many objects to hang, you may benefit from buying both standard and mini anchors and a kit that includes the screws and driver bits. Metal zip-it anchors are typically more durable than nylon, but both are beneficial. Each style is easy to install, and the prices are comparable. No matter which one you choose, this type of anchor shouldn’t be used for heavier applications. Although the body expands once it’s screwed into the surface, it doesn’t provide the heavy-duty strength of some other options.When you screw in an anchor, the spiked end or cutting blades will start the hole. In order to make things easier, you can also punch your own hole with an awl or any pointed tool. Once you’re ready for the installation, use a screwdriver or drill to twist the screw and anchor, or the anchor alone, until the rounded end is flush with the surface. The anchor will spread and bite the inside of the drywall or wallboard.If you use the wrong fastener, the size of the hole can eventually increase, the surface material can become damaged and the nail or screw can slip out. This is a chance you don’t have to take. Anything worth displaying on your walls is worth hanging properly. Installing a zip-it anchor is easy, quick and convenient, and it can safeguard your precious décor and fixtures.