STAINLESS STEEL SQUARE TAPER WASHERS FOR I-SECTION DIN 435

Square Taper Washers for I-Section DIN 435 — I-beam flanges slope outward from the web in the same way U-section channel flanges do, just at a different angle and profile, and DIN 435 is built on the same tapered-wedge principle as DIN 434 to correct for it - matched specifically to I-section geometry rather than channel sections. Without it, a standard flat washer tightened against an I-beam flange would only contact the sloped surface at one edge, concentrating load unevenly and risking the same problems a mismatched washer causes on U-section steel: reduced clamping efficiency, uneven bolt loading, and a joint that is more prone to loosening or bolt bending under sustained load than the finished connection would suggest. DIN 435's taper compensates for that slope directly, so the fastener ends up bearing on a properly squared surface once the washer is in place, rather than relying on the bolt or the flange itself to absorb the mismatch. It is specified wherever bolted connections are made to I-section structural steel - steel frame construction, general fabrication, and machinery mounted to I-beam structures - and, like DIN 434, the taper angle here is specific to this beam profile; the two standards are not interchangeable between beam types, so confirming whether the connection is to an I-section or U-section member is the first real decision when specifying either one. Taper washers are produced to standard angles corresponding to typical structural beam flange slopes, but the exact angle for a given size should still be confirmed against the DIN 435 dimensional table for the beam size in use rather than assumed to be universal across all sizes. Material selection generally follows the wider structural specification: standard steel with suitable plating for most steelwork, and A2 (304-equivalent) or A4 (316-equivalent) stainless where the structure is stainless itself or exposed to marine, coastal, or chemically aggressive conditions. To choose correctly, confirm the bolt diameter and that the connection is genuinely to an I-section rather than U-section member before selecting DIN 435.

FAQs
Why is a tapered washer needed on I-section steel?
I-beam flanges are typically sloped from the web outward, so a standard flat washer would only contact the flange at one edge; the taper on DIN 435 compensates for the slope, giving a full, even bearing surface.

How does DIN 435 differ from DIN 434?
DIN 435's taper is matched to the flange slope of I-section beams, while DIN 434's taper is matched to U-section (channel) beams; the taper angle differs between the two, so they are not interchangeable between profiles.

Does the taper angle vary by beam size?
Taper washers are produced to standard angles corresponding to typical structural beam flange slopes; the exact angle for a given size should be confirmed against the DIN 435 dimensional table for the beam size in use.