Washers

A washer is a ring-shaped fastening element with a hole, used for assembling various structures in virtually all industries. It is installed as a spacer between the mounting surface and the head of a bolt, screw, or nut. This increases the bearing area, distributes pressure evenly across parts, and prevents surface damage. A washer also prevents self-loosening of the joint under vibration and loads. Certain types — quick-release retaining washers, lock washers — can be used as standalone fasteners. They are often made of stainless steel.

Types of washers and manufacturing standards

Washers are classified by material, coating type, product grade, and other parameters.

Manufacturing is governed by the Russian GOST standard, and almost every standard has a counterpart in the German DIN. The main types:

• Flat washer. The most common type, available in three versions: normal (DIN 125, equivalent to GOST 11371), large (DIN 9021, equivalent to GOST 6958), and small (DIN 433, equivalent to GOST 10450). Widely used both in everyday applications and in production.
• Spring lock washer, or gromer washer (DIN 127, equivalent to GOST 6402). A metal lock washer shaped as a split ring. Used together with metric fasteners, it prevents parts from unscrewing. It is placed under the nut. When tightened, the sharp edges grip the surface of the nut and the mounting surface, creating a secure fastening.
• Quick-release retaining washer, or external ring (DIN 6799, equivalent to GOST 11648). A steel mounting washer, fitted into grooves of the part being secured. Its design allows the washer to be quickly removed or installed. Its main purpose is to reinforce the thread of the joint and prevent stripping. Made of 65G steel.
• Lock washer with tabs (DIN 463, equivalent to GOST 13463). For assemblies subject to increased vibration. The washer has two tabs of different lengths that are bent over the edges of the bolt, reinforcing the fastening point.
• Bevel washer (DIN 434, equivalent to GOST 10906). Its purpose is to compensate for slope in threaded connections of steel structures, channel flanges, and beams.
• Serrated washer (DIN 6798, form A, J, and V). Made of zinc-plated steel. It is a ring with a hole and sharp teeth along its outer edge. The teeth press into the surfaces as the fastener is tightened and lock the parts, holding the joint in its original position.
• Conical spring washer (DIN 6796) — a cone-shaped disc spring. It addresses issues of strong vibration and expansion at elevated temperatures by compensating for the distance between the bolt and the nut.

Washer dimensions depend on the manufacturing standard. For example, for flat washer GOST 11371, the nominal thread diameter of the fastener ranges from 1 to 48 mm, the outer diameter from 4 to 92 mm, the inner diameter of the washer from 1.7 to 52 mm depending on version and product grade, and the thickness from 0.3 to 8 mm.

All data is shown in the table and on the washer drawing — a cross-section in two projections with the designated parameters labeled.

How to order and buy

The site catalogue is organized in detail. You can find the items you need using the filter, selecting products by category and parameters. An online fastener and hardware weight calculator is also available for calculating your order yourself.

To place an order, select products in the catalogue and add them to the cart. Clicking the “Send request” button opens a form where you need to provide a contact person and preferred method of communication. A sales manager will contact you and advise on your order. Alternatively, call our toll-free number or request a callback on the site.