Surface continuity
A head designed to integrate with the surrounding surface. Installation geometry must follow the selected product specification.
FLUSH FASTENERS®
Concealed-drive stainless steel fasteners for assemblies where surface finish, cleanability and access for maintenance matter.
The retractable mechanism closes the drive recess when the tool is removed. It combines a flush appearance with access to the fastening.
A head designed to integrate with the surrounding surface. Installation geometry must follow the selected product specification.
The drive is accessible during installation and maintenance, then covered by the returning plunger.
Closing the exposed drive recess reduces a potential residue-trap area. The cleaning procedure still depends on the application.
THE MECHANISM
Press the specified bit against the head to reveal the drive. After tightening, removing the tool allows the plunger to return to its flush position. Confirm the drive type, tightening instructions and installation dimensions for the selected reference.
The original demonstration compares residue around different fastener heads before and after wiping. It illustrates surface geometry; it is separate from the quantitative laboratory study below.
DOCUMENTED TESTING
The manufacturer publishes a study comparing 32 Flush and 32 slotted fasteners after Bacillus subtilis inoculation and a defined disinfection procedure. Mean residual colony counts were 3.17 and 172.64 respectively: over 98% lower for the tested Flush samples.
This result applies to the study conditions and is not a general guarantee of sterility or contamination prevention.
The published 168-hour ASTM B117 test examined four fasteners. Two showed no red rust; the other two showed localized red rust on 5% and 10% of their surfaces. All four remained functional.
Laboratory exposure is not a prediction of service life or universal suitability for marine use.
Assess each application against loads, exposure, maintenance and the required finish.
Share the drawing and application requirements with Dueemme Sidol.