Definition -A Coupling Key is a mechanical key used to connect a coupling to a shaft so that torque is transmitted without slippage. Its purpose is to lock the coupling and shaft together for reliable power transmission while maintaining proper alignment. Coupling keys are commonly used in motors, gearboxes, pumps, and industrial drive systems.

Sunmach is a leading global manufacturer and supplier of high-precision Coupling Keys, produced using premium Nickel Alloys and Stainless Steel. These Coupling Keys are machined strictly to customer-approved drawings and maintained well within specified dimensional tolerances. These customized shafting components are designed to perform reliably in the most demanding industrial applications.

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 Coupling Key.

We make these Coupling 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.