3-519061-2 is a 4×4×40 mm DIN 6885 standard key manufactured by TE Connectivity. This product is now obsolete and is no longer actively produced or supported. The key conforms to DIN 6885 specifications, which define standard parallel keys used in mechanical power transmission applications for coupling shafts and hubs. The product meets EU RoHS Directive 2011/65/EU, EU ELV Directive 2000/53/EC, and EU REACH Regulation (EC) No. 1907/2006 compliance requirements, with low halogen content (Br, Cl, F < 900 ppm per homogeneous material) and is BFR/CFR/PVC free. Although obsolete, this component was historically used in industrial machinery and mechanical assemblies where reliable shaft-to-hub key engagement was required.