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The Astro Pneumatic 3039 is a pneumatic belt file that runs 3/4 x 20.5 inch belts on a narrow, adjustable arm. It is built for weld prep, deburring, cleaning and blending on tubing and in tight spots where a full-size belt sander will not fit. The adjustable roller lets you sand along curved surfaces and reposition the arm for reach. Against electric belt files it trades cordless convenience for a smaller, lighter body and constant air power, and it needs a compressor with real CFM behind it. Owners treat it as a fabrication-shop tool that saves time on tube joints and weld cleanup.
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Lowest price we've seen: $161.70 on Nov 10 at JB Tools. Tracked across 1 store since Nov 10.
Fabricators and metalworkers rate the 3039 as a handy, affordable air belt file for weld prep and tube work. They like the narrow belt and adjustable arm for getting into joints a bigger sander cannot reach. Complaints center on air consumption, noise and the fiddling needed to keep belts tracking.
The Astro Pneumatic 3039 is an air-powered belt sander for tubing and weld work. It is an adjustable 3/4 x 20.5" air belt file used for cleaning, weld prep, and material removal on tubing.
The roller position can be adjusted, so the sander can work along curved surfaces. It accepts most belts of the 3/4 x 20.5" size, and belts in that size are included.