8" Radius Blocks

8" Radius Blocks

7-1/4" radius

Item # 0415
In stock, ready to ship!

$20.11

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9-1/2" radius

Item # 0405
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$20.11

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10" radius

Item # 0416
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$20.11

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11" radius

Item # 0406
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$20.11

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12" radius

Item # 0417
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$20.11

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13" radius

Item # 0437
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$20.11

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14" radius

Item # 0419
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$20.11

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15" radius

Item # 0420
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$20.11

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16" radius

Item # 0418
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$20.11

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17" radius

Item # 0421
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$20.11

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18" radius

Item # 0438
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$20.11

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19" radius

Item # 0439
In stock, ready to ship!

$20.11

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20" radius

Item # 0403
In stock, ready to ship!

$20.11

+

Flat

Item # 0440
In stock, ready to ship!

$20.11

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8" Radius Blocks

About This Item

Accurately true or change a fingerboard's radius and level frets.
We make these hardwood blocks for use with Stikit Abrasives, to radius a fretboard quickly, accurately and without guesswork.

Shaping fingerboards: use 80 through 220-grit
Leveling frets: use 220 through 400-grit

When working on compound radius fretboards, simply change blocks as you progress along the neck.

Dimensions: 8" (203.20mm) long x 2-3/4" (69.85mm) wide

See our shorter blocks for spot leveling, and for use as clamping cauls when gluing frets.

What's your radius?
Quickly find the curvature of a fingerboard or bridge with a set of radius gauges. Use them frequently to check your work as you smooth or shape a fingerboard or frets: a quick visual check keeps you from accidentally altering the shape—a mistake that's easy to make and hard to fix.

Radius Gauges

Instructions

Product Instructions

Radius Block Basics

An explanation of the different uses of a radiused sanding block.

Customer Reviews

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5.0
  • 4.76 average rating from 174 reviews
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2.0

Seems cheaper than the pic.

By

Verified Buyer


It works, but there is no stewmac logo like in the pic and it's not quarter sawn, kinda looks cheap, and has the radius number stamped on the side like the cheap Chinese ones i see on eBay. Also not very hard, i used it as a clamp for gluing frets and it easily dented. Was hoping for more paying the big bucks!

Response from StewMac


Hi Craig,

We're sorry to hear that our 8" Radius Blocks didn't meet your expectations. Our guarantee is 100% satisfaction in every way. If a product doesn't meet your expectations, you are welcome to return it anytime for a refund or exchange.

We apologize for any confusion the picture on our website has caused. We recently updated our old "Stewart-MacDonald" logo to our newer "StewMac" logo on these Radius Blocks.

Our customer support team has decades of experience making customers happy. Please feel free to call us at 1-800-848-2276. We look forward to helping you with this.

5.0

Save Time!

By

Verified Buyer


I find the radius blocks very accurate and save me time. My levels are jealous now cause they are not seeing the light. Been using the block now for all my fret leveling in addition with the 3M Self Adhesive! a winning match

5.0

Must have

By

Verified Buyer


Decent price. Ive had to smooth the bottom surface on all four that I got as they were wavy and lumpy but the radius is correct.
I use these with 320 for leveling because Im concerned that sanding with a straight bar doesnt keep the boards radius.

4.0

Great until they warp

By


These are awesome - mostly. Check yours after a year(s) with a straight edge. I've had a number become warped over time - not a terrible amount but untrue is untrue. I wasn't surprised to find the ones that have stayed true are quartersawn and the warped ones are flat or skew cut. You can easily true them back by putting stikit on a big pipe, PVC, etc - so all mostly good, just check them!

5.0

Excellent

By

Verified Buyer


If you don't have a lot of guitars to repair, and are on a budget, these blocks are great! I've done 2 guitars so far with this block with Excellent results. I would feel comfortable doing another 6 to 8 with this "wood" block. No signs of wearing at all with that amount of usage. Though it's not the full length of the neck, which was a concern for me at first, in actuality, I think it might work even better than a full length sanding block. However, I would not use a shorter one unless I had 1 or 2 frets "specially" that were really worn or screwed up. I used the 320 grit sticky paper I also bought on stewmac. It works perfect. The 320 takes off so little, that it would be almost impossible to screw up a fret level. Had to use six cuts of the paper with the paper because I had to take a lot off/lowering, but better safe than sorry. That coupled with the Z Centerfile and some steel wool, and this process was so easy a child could have done it. Worth every nickel!

5.0

Made my guitar(s) play great!

By

Verified Buyer


I am very happy with the results after using this tool. I am not an expert, or even a good amateur, but I do like getting stuff working well, and this REALLY did that for the guitars I have flattened so far. I just wanted to let others know what I found out before they start down the same path.
- YouTube is your best friend here...
- Along with this block (check for the correct radius), sticky sandpaper, and a truss wrench/key, you will NEED a slotted straightedge for the guitar's correct scale length. You need to pull the strings off (I just pulled the pins and used a twist tie to coil the strings at the headstock), and then use the truss rod adjustment to get the fretboard wood as straight as you can BEFORE you start fret leveling. I don't think that the board straightening step is optional, and (as far as I can tell) you need to use the slotted straightedge tool to do it right (and also to set your relief after you are done).
- I bought the #320 sticky sandpaper roll. Worked like a champ, but if I did it over, I would probably buy closer to #400 grit (or maybe even finer?) to better balance final smoothness with speed of cutting.
- It doesn't take much sanding on your frets with this block to get a shiny strip across the entire top of each fret. Stop quickly once you see all of the fret tops are fully polished. No need to waste any extra fret depth, and if it didn't quite do the job, it only takes another 30 minutes total work time to touch up. I left some tiny dents where the high E string had worn a groove. Light reflected off the tops of the frets worked great to verify progress.
- I was super careful to keep the block centered and square, and sand lightly and evenly along the entire fretboard. The first 30 seconds to a minute (very light pressure), I could feel slight bumps as the individual frets passed under the block. It soon went to a smoother glide for the last minute or so till all of the fret tops were even.
- If you take it easy on your frets, you probably don't need a fret dressing file or polishing tools right away, though the fret dress and polish looks like it will add a new dimension to the look and feel of the guitars. Just not quite in the same league of upgrade as making the frets buzz free.
- Good Luck

5.0

A great radius block

By

Verified Buyer


I needed a radius block to level the fingerboard on my fretless and this was just what I needed! I went with the 8'' so that I could cover more area since I was doing the entire fingerboard. Paired the block with the adhesive sand paper and my job was done quickly, and the results were super!!
Thanks StewMac!!

5.0

Great for the Price.

By

Verified Buyer


I have a set of these now and for the price you can't beat them!

5.0

The right tool

By

Verified Buyer


A great job is done with the help of the right tool. This one fits the bill for a number of applications related to a 12” fingerboard.

4.0

Works well for what I wanted it for

By

Verified Buyer


I bought the less expensive wooden block instead of the high $ aluminum blocks because I have a few cheaper acoustic guitars that I wanted to level and I wasn't disappointed. I didn't get the stick on paper, I just wrapped a full sheet around the block and it did the job. In the future, I will probably get the sticky paper but it isn't a must to do the job. I'm not sure if I'd use it on my more expensive guitars but fortunately, they aren't in need of any fret work anyway. If wrapping the paper around the block as I did, you can trim the length of the sheet to fit the length plus, I was able to hold the paper tighter than in the photos. They are for representation of how I did it anyway. Four stars only because the end edges are able to get dinged on a fret if you're not careful. But otherwise, I think it's a great tool and would recommend it.

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StewMac PDF Catalog, page 10 See 8" Radius Blocks
on page 10 of our StewMac Digital Catalog