Soko is a manufacturer of high-strength socket head fasteners and precision bolts produced to DIN and ISO standards. Their socket head cap screws and socket set screws are manufactured from alloy steel and stainless steel, heat-treated to Grade 12.9 and Grade 10.9 strength specifications, and are used across machine building, tooling, and precision engineering applications where high clamping force in a compact, recessed-drive fastener is required.Soko socket set screws are headless fasteners that secure components against rotation on shafts, and Soko countersunk socket head screws provide a flush-fitting alternative to the standard cap head for applications where the fastener head must sit below the work surface. Both are driven by a hexagon key and are available in alloy steel and stainless steel grades.Where this product is usedSocket set screws and countersunk socket head screws are used across mechanical assembly: Shaft and collar assembly where set screws lock hubs, pulleys, and couplings against rotation without through-bolting. Panel and cover fastening where a flush surface is required and countersunk socket heads provide a clean, recessed finish. Machine guarding and enclosure assembly where socket countersunk screws must sit flush to avoid snagging or catching. Key specifications Specification Detail Grade / Class 12.9 Selecting the right optionSet screws (grub screws) are selected by M-size and point type: cup point for general-purpose shaft gripping; flat point for soft shaft materials where surface damage must be minimised. Countersunk socket head screws require a countersink or recess in the mating part — confirm the head angle (typically 90°) matches the countersink. Select thread pitch (coarse or fine) to match the threaded hole specification.
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