Tool Steel SKS3 Oil-Free Plain Guide Rails (No Groove)

These oil-free plain guide rails are used inside injection mold tooling wherever linear slide motion must stay clean with minimal lubrication. The no-groove rail design helps prevent contamination transfer in environments that cannot tolerate oil mist or residue buildup.

• Automotive connector and bracket molds: install the rails in lifter or slide mechanisms where frequent opening/closing demands stable alignment and smooth motion during positioning cycles.
• Medical device housing molds: use the oil-free configuration to support cleaner mold operation for parts produced in tighter hygiene workflows.
• General undercut plate / slide plate systems: the plain heel construction supports straightforward mounting and repeatable travel geometry for guider blocks and moving plates.

This variant is suited because it combines oil-free operation (no oil groove) with a steel rail body, supporting reliable guidance while reducing maintenance demands.

SKS3 tool steel (oil-free plain guide rail body) is selected for dimensional stability and practical wear resistance in guide applications with intermittent loading and positioning cycles. Unlike higher-hardness tool steels, SKS3 is typically used with a balance of toughness and machining practicality, which helps maintain sliding performance under repeated starts and stops.

• Hardness: SKS3 is commonly supplied in an oil-tempered/pre-hardened condition for tooling use; final hardness depends on the manufacturer’s heat treatment route. Verify your required wear level and contact conditions against the system’s expected loads.
• Wear resistance vs. toughness: increased hardness improves wear resistance but can reduce impact toughness at the rail edges; SKS3 is often chosen to balance both.
• Alternative option: the rail material can also be specified as a copper alloy, which may be used for specific friction/compatibility needs but typically trades off strength and load-bearing wear performance versus steel.

To select the correct guide rail size, match the rail geometry to the mold slide’s load path and the available mounting envelope on the undercut plate or slide plate. This series offers variable dimensions that should be chosen based on cavity/core layout and required stroke travel.

• Rail thickness (T): choose within 10–35 mm to suit stiffness requirements and mounting screw boss depth.
• Rail width (W): select from 12.5, 15, 20, 25, 30 mm to provide adequate contact area for stable alignment.
• Rail length (L): pick 40–200 mm to cover the full guided travel range plus allowance for end clearance.

For proper fit, ensure the rail thickness and width align with the guider block or mating slide-plate pocket geometry. Because actual machining tolerances depend on the mold component design and supplier process, confirm the required clearance/fit for smooth oil-free sliding at operating temperatures.