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A straight-body die grinder for deburring and detail metal work, suited to a shop already running compressed air tools.
A light-duty pencil grinder for detail deburring work, best matched to precision jobs on small parts rather than heavy grinding.
A 0.1 hp pencil grinder for detail work that matches its 51706 sibling on power, though its lower rating makes checking the 51706 first worthwhile.
A compact air-turbine pencil grinder for fine detail work, not a substitute for a full-size die grinder when there is real material to remove.
A straight-body 5 inch grinder for the specific jobs an angle grinder's head is too wide for, not a general-purpose replacement for one.
A micro grinder sized for detail work through a small 3mm collet, worth considering mainly for fine, controlled tasks rather than general grinding.
A high-speed precision grinder built for small-burr detail work at 60,000 rpm, not a substitute for a heavier, higher-torque grinder.
A mid-speed inline grinder with a 1/4 inch collet, sitting between micro grinders and heavier die grinders in both speed and accessory size.
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Dynabrade, Makita, Sioux, SP-1900, 12R0410-18 lead this category among the 6 brands that passed our curation checks.
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Straight grinders, often called die grinders, hold a small mounted stone, burr, sanding drum or cut off wheel in a collet and spin it at very high speed. They are used to port engine heads, deburr welds, shape castings, clean up holes and work in places an angle grinder cannot reach. The first decision is the power source, because pneumatic die grinders are light and powerful but need a compressor that can supply enough air, while electric and cordless models plug in or run on a battery.
Speed and collet size are the next questions. Among the 7 products that list maximum rotational speed, most fall between 20,240 and 64,000 rpm, and 60,000 rpm is typical. Very high speeds suit small burrs and fine stones, while larger wheels need lower speeds to stay within their rating. A variable speed control lets you match the tool to the accessory and to the material, which reduces chatter and heat. Collet size decides which accessories fit, so check that it matches the burrs you already own.
Body shape and length matter for reach and control. Short bodies are easier to handle, while extended models reach into deep cavities. Right angle heads let you work around corners, and a rear exhaust on air tools keeps air away from your face and the work.
Before buying, check the collet size, the speed range, the power source and air requirement, the weight, and which wrenches and collets are included. For air tools, plan for an inline oiler or a few drops of oil before each use. Wear eye protection and gloves, keep the accessory's stem fully inserted in the collet, and never exceed the speed rating printed on the stone or burr. Burrs in carbide cut metal fast and last a long time, while mounted stones suit finishing and smoothing.
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