Precision CNC Machined Stainless Steel Dowel Pin with High Corrosion Resistance and ±0.01mm Tolerance

This CNC stainless steel pin shaft is a precision mechanical accessory integrally processed by CNC turning and milling compound machining. It is widely applied to automation tooling, mold positioning, hydraulic valve hinge connection, transmission limiting and equipment supporting structures, serving functions of positioning, hinging, limiting and guiding.

Adopting a full-process closed-loop CNC machining process, parameters including coaxiality, outer diameter, steps and connecting threads are controlled synchronously. It fits working conditions featuring high-frequency reciprocating motion, repeated disassembly and high-precision positioning, and the positioning benchmark will not deviate after long-term service.

The connecting threads at the end of pin shafts are uniformly turned by forming cutters. Every finished piece is inspected one by one with thread gauges in strict compliance with metric thread standards. The go gauge can be fully screwed in smoothly without blockage, and the screwing depth of the no-go gauge is controlled within standard limits.

This thoroughly avoids incomplete thread teeth, excessively loose or tight fitting. There is no clearance after locking the pin shaft with matched nuts or valve seats, making it suitable for hinged positioning structures requiring frequent disassembly, assembly and maintenance.

Standard tooling positioning is adopted throughout production. The outer circle, steps, end faces and threads of each pin shaft are finished in a single clamping setup, reducing dimensional deviation caused by secondary re-clamping.

Critical dimensions such as outer diameter, step thickness, overall length and thread pitch diameter are controlled within narrow tolerance ranges. Pin shafts from the same batch deliver highly consistent coaxiality, eliminating manual fitting and grinding during mass interchangeable assembly, and guaranteeing unified repeated positioning accuracy for tooling and molds.

After turning and milling, a composite deburring process combining ultrasonic cleaning and flexible tumble polishing is implemented. No flash, burrs or sharp edges remain on the cylindrical surface, step corners, start and end faces of threads, and chamfer positions.

The surface features consistent and smooth roughness. It will not scratch bushings, sealing parts or mold cavities during reciprocating sliding and hinged operation, and prevents accumulation of metal debris that causes motion jamming.

Working requirements: High coaxiality and narrow tolerance range to ensure alignment accuracy during mold opening and closing; smooth burr-free cylindrical surface reduces mold cavity abrasion; qualified end threads resist loosening under long-term vibration from mold clamping.

Working requirements: Smooth surface prevents scratches on internal sealing components and leakage of hydraulic media; uniform thread fit avoids thread slipping during valve block disassembly; stainless steel material resists corrosion from long-term immersion in hydraulic oil.

Working requirements: Consistent dimensions within one batch for interchangeable multi-station transmission structures; burr-free surface cuts down friction loss during operation; reliable thread locking prevents displacement of pin shafts during continuous equipment running.

Solution: Threads are machined with special CNC thread forming cutters, and all finished products undergo 100% go & no-go gauge inspection. The thread angle and pitch are controlled uniformly to form complete thread meshing surfaces, and the thread teeth are not prone to damage after repeated locking and disassembly.

Solution: Single-clamp compound machining eliminates accumulated errors from multiple re-clamping. Real-time online inspection is conducted for key dimensions to maintain long-term stable tolerance ranges, and pin shafts from the same batch support direct interchangeable assembly.

Solution: The composite flexible polishing process covers all corners and thread inlets & outlets to completely remove flash and burrs. The smooth surface protects matched plastic, copper and rubber sealing components and extends the service life of the whole mechanism.

SITUO Hardware specializes in CNC turning-milling compound precision machining of stainless steel pin shafts and various high-precision mechanical accessories. We can customize the overall length, step diameter, thread specification, chamfer and guiding structure of pin shafts for tooling molds, hydraulic valve blocks and automatic positioning adjustment devices.

To adapt to diverse working conditions of different equipment, we support multi-material customization including carbon steel, stainless steel, aluminum alloy, brass and engineering plastic. Equipped with turning-milling compound CNC production lines and a full-process dimensional inspection system, we steadily supply pin shaft accessories with qualified threads, unified dimensional tolerance and full burr-free smooth surfaces.

We have introduced advanced equipment and technology from Japan and Germany (CNC 5-axis and 6-axis machines) to better serve our customers' needs.

Our maximum processing outer diameter is 60mm, and the minimum control tolerance is 0.001mm. We have Japanese CNC Tsugami, CNC Citizen, multi-station cold extrusion forming machines, 500T press machines, casting equipment, and various process equipment, which can effectively provide customers with the best technical solutions.

Our company has a total of 300 employees, including 20 technicians, 10 engineers, and 15 quality control personnel. We have over 300 pieces of equipment.

Our company implements 8S management and has passed ISO9001 and TS16949 automotive certifications.

Our customers include B-osch, Foxconn, Motors, Husqvarna, Shimano, NVIDIA, DJI Drones, Siegenia, and C-aterpillar.