STAINLESS STEEL TAB WASHERS WITH LONG TAB AND WING DIN 463

Tab Washers with Long Tab and Wing DIN 463 — DIN 463 takes the single-tab locking principle of DIN 93 and adds a second point of mechanical restraint: a long tab that bends up against a flat on the nut itself to stop it turning, plus one or more wing tabs that bend down against the side of the surrounding component or housing to stop the washer itself from rotating. Locking both the nut and the washer independently, rather than relying on just one tab doing both jobs, makes DIN 463 a genuinely more secure design than a single-tab washer, which is why it is specified on joints where the reliability of the anti-rotation feature really matters - machinery subject to significant vibration, or connections where the consequences of the nut backing off would be serious. That extra security does come with a practical downside: once the tabs have been bent into position and later straightened out for disassembly, the metal at the bend points is work-hardened and weakened, so DIN 463 washers are generally treated as single-use, with a fresh washer fitted on reassembly rather than the old one being bent back into shape and reused. Specifying it correctly means checking there is enough physical clearance around the assembly for both the long tab and the wing tabs to actually be bent into their locking positions once the nut is tight - a detail that is easy to overlook on compact assemblies where DIN 93's simpler single-tab design might fit more easily. Material selection follows the mechanical and environmental demands of the joint: carbon steel suits most general machinery, while A2 (304-equivalent) stainless is the standard upgrade for outdoor or washdown environments, and A4 (316-equivalent) is worth specifying for marine, coastal, or chemically aggressive conditions where the tabs themselves, being thin, can corrode and weaken faster than a heavier component would show equivalent wear. To choose correctly, match the bore to the nut and shaft or bolt size and confirm the assembly allows enough room for both tab features to be formed.

FAQs
How does the wing feature improve locking security?
The long tab engages a flat on the nut to prevent it turning, while the wing tabs bend against the side of the component or housing, adding a second point of mechanical restraint against loosening.

How does DIN 463 differ from DIN 93?
DIN 93 has a single long tab, providing one point of mechanical engagement, while DIN 463 adds wing tabs for a second point of restraint, giving a more robust anti-rotation solution overall.

Are DIN 463 tab washers reusable?
Generally not. Once the tabs have been bent into position and then straightened for disassembly, the metal is work-hardened and weakened at the bend points, so a new tab washer is normally fitted on reassembly.