Yamamura’s Sanjo-made Keiun line separates a Damascus-bodied YM cutter from Nimbus thinning options with stated model cut rates.
Keiun is Yamamura Manufacturing’s salon-shear brand. Compare the YM cutter’s layered body and ATS314 blade with Nimbus thinning variants before choosing.
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The Keiun maker history identifies Yamamura Manufacturing as a Sanjo, Niigata blacksmith business dating from 1948. It dates the Keiun scissor brand to 2006. The maker says it handles material selection, forging, rolling, finishing and assembly internally, and shows those steps in its manufacturing guide. That is stronger origin evidence than a country label alone, but it still pays to match the named variant.
The Keiun YM cutter is offered in 5.5 and 6 inches. Its maker sheet names a 16-layer nickel-Damascus body and ATS314 cobalt-alloy cutting blade, with offset handle and screw options. Calling the whole shear simply “Damascus steel” hides the more useful distinction between visible layers and the working edge. The sheet positions YM for general cutting; it does not prove a particular edge life in your salon.
The Nimbus YMD thinner has several tooth configurations with different stated cut-rate ranges: 303RS 12–15%, 302C 15–20%, 303C 25–30%, and 1010D 50–60%. These are maker model estimates, not a promise for every hair section or stroke. Choose a texture goal first and check the exact variant before using the percentage as a comparison.
Keiun’s Japanese site offers rental and maintenance routes, subject to its local terms. Buyers outside Japan should confirm availability, return conditions and sharpening support in their own market. The thinner guide gives a useful way to test cut rate and placement without assuming material or tooth count alone settles the choice.
No. The maker history says Yamamura Manufacturing began in Sanjo in 1948 and established the Keiun brand in 2006.
The YM model sheet lists a layered nickel-Damascus body and an ATS314 cobalt-alloy blade. Keep the body material and cutting edge distinct.
No. The Nimbus YMD listing gives different maker-estimated cut-rate ranges for 303RS, 302C, 303C and 1010D. Confirm the selected variant and test on your section size.
Sources checked for this profile: Keiun company and brand history, Keiun manufacturing process, Keiun YM model, Nimbus YMD thinning variants.