Working on a project that requires left-hand thread fasteners? This set of 4 M5x17mm bolts is exactly what you need. Made from strong 40Cr steel with a black oxide finish, these bolts are built to last and resist corrosion. They feature a flat countersunk head with a hex socket drive, so you can get a flush fit and tighten them easily with an Allen key. The reverse thread design means you turn them counter-clockwise to tighten and clockwise to loosen – perfect for specific applications where standard right-hand threads won’t work. Each bolt is fully threaded and measures 20mm in total length, with a head diameter of 9.6mm and a hex socket width of 3.1mm. They meet the DIN7991 standard and have a grade of 10.9, so you know they’re tough and reliable. These bolts are commonly used in machinery, appliances, automotive work, industrial equipment, and DIY projects where secure, reverse-thread fastening is required. Whether you’re repairing equipment, building custom parts, or working on machinery that uses left-hand threads, this 4-pack gives you the right hardware for the job. Just remember – lefty tighty, righty loosey with these!
