STAINLESS STEEL COUNTERSUNK EXTERNAL TOOTH WASHERS DIN 6798V

Countersunk External Tooth Washers DIN 6798V — A countersunk screw head is conical by design, so a flat lock washer beneath it would only make contact at one thin edge rather than seating properly - DIN 6798V solves that by giving the washer itself a matching conical bearing face, so it sits flush against the full countersunk profile while still presenting a bearing surface to the clamped component underneath. That conical seat is combined with the same external-tooth biting action as the rest of the DIN 6798/6797 family, so the washer both centres and seats the countersunk head correctly and provides mechanical resistance to rotation and self-loosening, which a flat tooth washer simply cannot deliver under this head type. Because the seating geometry is specific to countersunk heads, DIN 6798V is not interchangeable with the flat-bearing DIN 6798A - fitting the wrong one means either the washer will not seat correctly against a countersunk head or, on a pan or hex head, the conical face will not bear evenly. It is worth remembering that the washer sits between the screw and the clamped material rather than replacing the countersink itself, so the countersunk recess in the material still needs to be sized to suit the screw head as normal, with the washer's own thickness accounted for in the overall stack. It is specified wherever countersunk screws need vibration resistance in equipment assembly, panel work, and general engineering - anywhere a flush, countersunk fixing also needs to resist working loose under vibration. Material selection follows the usual pattern: carbon steel with a protective plating for general indoor use, A2 (304-equivalent) stainless for outdoor, washdown, or hygienic applications, and A4 (316-equivalent) where marine, coastal, or aggressive chemical exposure would otherwise compromise both the tooth bite and the conical seat over time. To specify correctly, match the bore and conical seat angle to the countersunk screw in use, and confirm the screw head size falls within the washer's rated diameter range.

FAQs
How does DIN 6798V differ from DIN 6798A?
DIN 6798A has a flat bearing face for pan, cheese, or hex head screws, while DIN 6798V's conical face is specific to countersunk heads, and the two are not interchangeable.

Does DIN 6798V affect the countersink depth in the clamped material?
The countersink in the clamped material still needs to be sized for the screw head as normal; the washer sits between the screw and the material, so the countersink depth should allow for the washer's thickness in addition to the screw head.

How do I choose the correct DIN 6798V washer?
Match the bore and conical seat angle to the countersunk screw being used, and confirm the screw head size against the washer's rated diameter range.