Norma 01266704016-000-0539 Hose Clamps, 12 mm-20 mm x 9 mm W4 (Pack of 10), 0.5, Pack of 10

I watched a YouTube video where this engineer runs a series of strenuous tests on hardware from different manufacturers. Well, this time around he bought hose clamps from 8 different manufacturers and ran them through pure hell. Every test culminated in the destruction of every single clamp. So, who was the winner? Norma was the clear front runner in nearly all of the tests. This is why I bought a large supply of every single size that Norma makes for my automotive shop. Zero failures to date.

love these clamps. you can tighten them way beyond what knock off clamps can do, and they won't damage silicone hoses. awesome

Just super well designed and do not cut the hoses. Excellent German engineering.

Used these on motorcycle coolant lines and were better than or as good as OE. All stainless bands and screws and small clamp around screw so they tighten up on smaller hoses. Cant ever source these locally at auto parts stores.

Good quality.

tightening standard worm clamps always a pain, saw someone mention these and tried em out, and they are definitely better. similar to the large ones you see on car intercooler piping or whatever. much smoother tightening. only complaint is the bolt for tightening isn't the typical size. others are noramlly the size those swappable screwdrivers socket are, which is better than using flat head. this one is some other size so have to use socket, more of a pain.