Definition -A Square Key is a mechanical key with a square cross-section used to connect a shaft and hub for torque transmission. Its purpose is to prevent relative rotation between the shaft and the mounted component while maintaining alignment. Square keys are commonly used in couplings, gears, pulleys, and general industrial machinery.

As a leading international source, Sunmach delivers precision-engineered square keys machined from high-grade Stainless Steel and Nickel-based materials. We execute every build to match customer-supplied schematics with extreme accuracy and tight tolerances. Our specialized hardware is built to withstand the most rigorous industrial environments.

We are an ISO 9001:2015 certified company, demonstrating our commitment to rigorous quality standards and consistent product excellence to deliver the best of the Nickel Alloys & Stainless Steel Square Key.

We make these Square Key from a range of high-performance & exotic materials such as : Hastelloy® C-276, Hastelloy® C-22, Hastelloy® B-2, Monel® 400, Monel® K-500, Inconel® 600, Inconel® 625, Inconel® 718, Titanium Grade 2, Titanium Grade 5, Titanium Grade 7, Duplex S31803, Duplex S32205, Super Duplex S32750 to various Stainless Steel grades of SS 304L, SS 316L SS 310, SS 310H, SS 347H, etc followed by Special Stainless Steel Grades such as 904L Stainless Steel, UNS N08904, DIN EN1.4539 Nitronic® 50, Nitronic® 60, UNS S21800, DIN EN, 254 SMO, UNS S31254, DIN EN 1.454, Stainless Steel 410 & Stainless Steel 420 etc.

Sunmach’s extensive manufacturing capabilities and In-Stock Genuine & Authentic Raw Material availability allows us to support demanding industrial requirements with durable, corrosion-resistant, heat resistant & reliable Shafts made from Genuine Nickel Alloys and Stainless Steel Material, delivered dot in time to any corner of the world, supported by all required test certificates and with 100% traceability.