STAINLESS STEEL SPHERICAL WASHERS DIN 6319C

Spherical Washers DIN 6319C — Not every bolted joint sits perfectly square to the fastener - cast, forged, or fabricated components often present a bearing face that is slightly out of perpendicular to the bolt hole, and clamping a standard flat washer against that kind of surface concentrates contact at one edge rather than spreading it evenly, risking uneven loading or bending stress on the bolt itself. DIN 6319C is the convex half of a purpose-built solution to that problem: its spherical face sits against the matching concave conical seat of DIN 6319D, and the two washers can rock slightly relative to each other as the joint is tightened, letting the bolt remain in full, even contact across the joint even when the surrounding surfaces are not perfectly aligned. It only works as a matched pair - DIN 6319C on its own does not provide the self-aligning function, since the spherical/conical interface depends on both halves working together - so it is never specified alone, and the corresponding DIN 6319D washer needs to be part of the same order. This kind of self-aligning washer set turns up specifically on structural, machinery, and pipeline flange connections where perpendicularity between the bolt hole and bearing surface cannot be guaranteed by the fabrication process, rather than in general assembly where a standard flat washer's flat, square bearing is a safe assumption. The permissible angular compensation is defined by the specific size in the DIN 6319 range, so the exact misalignment the pair can accommodate should always be checked against the standard's dimensional table for the size in use rather than assumed to be generous by default. Material selection typically follows the structural or mechanical duty of the connection: standard steel is common in general machinery, while A2 (304-equivalent) or A4 (316-equivalent) stainless variants are specified where the connection is exposed to corrosive process fluids, marine conditions, or outdoor weathering, with A4 reserved for the more aggressive of those environments. To specify correctly, select the matched C and D pair sized to the bolt diameter and confirm the expected misalignment falls within the set's rated range.

FAQs
How does DIN 6319C work with DIN 6319D?
DIN 6319C's convex spherical face sits against DIN 6319D's matching concave conical seat. The two washers can rock slightly relative to each other, allowing the bolt to remain in even contact across the joint despite angular misalignment.

Why not just use a standard flat washer on an angled surface?
A flat washer on an angled surface would only make edge contact with the bolt head or nut, concentrating stress at one point and risking uneven loading or bending stress on the bolt.

How much misalignment can a DIN 6319 washer set accommodate?
The permissible angular compensation is defined by the specific size in the DIN 6319 range; the exact angle should be checked against the standard's dimensional table for the size in use.