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Classification of washers and self-tapping screws


① Flat washer: It is used to overcome the uneven support surface of the workpiece and increase the stress area of the support surface. See GB848, GB95-97 and GB5287.

② Spring (elastic) washer: For spring washer, see GB93, GB859, etc. For elastic washer, see GB860, GB955, etc.

③ Stop washer: internal tooth lock washer, see GB861; external tooth lock washer, see GB862; single ear stop washer, see GB854; double ear stop washer, see GB855; round nut stop washer, see GB858 Wait.

④ Inclined washer: In order to adapt to the inclination of the workpiece support surface, an inclined washer can be used. For square beveled washer with I-beam, see GB852; for square beveled washer with channel steel, see GB853.

Self-tapping screws:

① Ordinary self-tapping screws: The threads conform to GB5280 (threads for self-tapping screws), and the pitch is large, which is suitable for use on thin steel plates or copper, aluminum, and plastic. See GB845-847, GB5282-5284 and so on.

② Self-tapping locking screw: The thread conforms to the common metric coarse thread, which is suitable for use in places where vibration resistance is required. See GB6560—6564.

① Unequal length double-headed studs: suitable for occasions where one end is screwed into the component body for connection or fastening. See GB897-900 and so on.

② Equal-length double-headed studs: suitable for connecting ends with nuts, for connection or distance. See GB901, GB953 and so on.