Which Bosch ROS?

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Forum topic by SlimTim posted 07-19-2015 12:24 AM 753 views 0 times favorited 3 replies Add to Favorites Watch
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07-19-2015 12:24 AM

Topic tags/keywords: bosch ros sander

Question from a new Lumberjocks member.

I’ve gone through several Random orbit sanders over the years, and my latest Bosch was just stolen out of my garage. I’m a hobbyist – build various kinds of furniture and cabinetry.

I have the $35 (!!) Bosch vacuum hose, which is great, and I was happy with the sander and my other Bosch tools, so I’ll probably stay with that brand.

So…Bosch sells a 5” ROS for (ballpark) $70, $150, $220, and $250 (and the 3 higher-priced ones can be had as 6” models as well).

They differ in amperage, dust canister type, vibration control, and the high-end one has “dual-action” where you can supposedly go to “turbo” mode, with 5x more aggressive stock removal.

I have a good stock of 5” discs that I don’t want to pitch, but I’ve been told that, since 6” discs have 40% more surface area, the discs last much longer as well as handling larger tasks. Can anyone comment about the step up in performance at the difference price points (as well as 6” vs 5”)?

I haven’t found this info in my searches, so I appreciate any advice.

-- Tim in Cinci

3 replies so far

View pintodeluxe's profile


5797 posts in 3010 days

#1 posted 07-19-2015 02:07 AM

The argument that 6” sanding discs last longer makes no sense to me by the way.
I have the ROS20VSK and it is pretty smooth, but not very powerful. The dust collection is good, but you will need to change the o-ring periodically. Otherwise dust will spew past a worn o-ring where the dust canister attaches to the sander.
I prefer my Dewalt 5” ROS because it is more powerful. I use the Bosch for the final grit, where it does a good job.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View SuperCubber's profile


1042 posts in 2481 days

#2 posted 07-20-2015 02:03 PM

The ~40% extra surface area is absolutely true. It’s actually closer to 45% more. That’s the reason the 6” discs last longer. You can sand the same size area faster, thus saving paper.

As to the specific models, I’m not much help. I have the ROS20VSK ($70) one, and my only complaint is that it could be a little more aggressive.


-- Joe | Spartanburg, SC | "To give anything less than your best is to sacrafice the gift." - Steve Prefontaine

View Fred Hargis's profile

Fred Hargis

5171 posts in 2690 days

#3 posted 07-20-2015 04:04 PM

I’ve had a 3725 for almost 15 years, and it still runs like a champ. It also has excellent dust collection when hooked to my vac. A few years ago I bought a PC 390 just to have a spare for when the Bosch dies…which it never has. It’s smooth once you get the right speed, and I’ve never even replaced the pad (more in a minute). Anyway, it’s still sold as the 3725 DEVS and is (IMHO) an excellent buy. Mine is the 5” size, just seems the 6” is a little too large for insode some door frames and such…I’ve never felt the need for a larger pad. Oh, yeah…the pad. If you put too much pressure on these, the pad overheats and melts the hooks, then you have to replace it. That happened with mine once hooked to the shop vac. It would almost hold itself to a vertical wall, I didn’t run it this way long at all. Instead, I vented the hose to the vac to reduce the suction at the sander…worked like a charm. Since then i bought a VS vac, and now turn it down to the lowest setting to catch the dust…this is all with the 1.4” common vac hose, not that one Bosch sells.

-- Our village hasn't lost it's idiot, he was elected to congress.

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