STAINLESS STEEL INTERNAL TOOTH WASHERS DIN 6798J

Internal Tooth Washers DIN 6798J — DIN 6798J covers the same internal-tooth concept as DIN 6797J - teeth positioned close to the bore so a smaller fastener head can fully cover and engage them - but under a separate standard with its own tooth geometry and size range, generally referenced for screw applications rather than the broader bolt-and-screw scope of DIN 6797. In practical terms the two work identically: the teeth bite into the fastener and the clamped surface as the joint tightens, resisting rotation and self-loosening, and the choice between DIN 6797J and DIN 6798J usually comes down to which specific standard a drawing or existing assembly already references rather than any functional difference worth designing around. It is specified wherever a small-headed screw needs a compact, hidden lock washer that does not extend beyond the fastener head - equipment panels, enclosures, and general machine assembly with cheese head, pan head, or similar small screws. It is not the right choice under a countersunk screw, though: a countersunk head needs a matching conical bearing surface, which is what DIN 6798V provides, rather than the flat bearing face of DIN 6798J, so head type should always be checked before defaulting to the flat internal-tooth washer. Material selection follows the fastener and environment as usual: carbon steel with a protective finish for general indoor assembly, A2 (304-equivalent) stainless where the equipment is outdoors, washed down, or handled in food and hygienic settings, and A4 (316-equivalent) where chloride or aggressive chemical exposure is a genuine ongoing factor rather than an occasional one. To choose correctly, match the bore to the screw diameter, confirm the screw head diameter is small enough for the internal teeth to engage fully once tightened, and check that the screw head shape is flat-bearing rather than countersunk.

FAQs
How does DIN 6798J differ from DIN 6797J?
Both have internally positioned teeth, but they belong to separate standards with different tooth geometry and size ranges; DIN 6798 is generally referenced for screw applications, while DIN 6797 covers a broader range including bolts.

How does DIN 6798J differ from DIN 6798A?
DIN 6798J has internal teeth, positioned near the bore for smaller screw heads, while DIN 6798A has external teeth on the outer edge, for use with larger screw or bolt heads.

Is DIN 6798J suitable for countersunk screws?
No. Countersunk screws require a matching conical bearing surface, which is provided by DIN 6798V rather than the flat-bearing DIN 6798J.