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MATCHED PAIR, Professional Quality Tool!
Hardened and precision ground 1" x 2" x 3" Block Set. This matched pair of blocks is ground to tolerances of .0003". 23 holes (5 tapped 3/8"-16 TPI and 18 plain).
Features:
- Precision ground and case hardened on all six sides
- Squareness on all sides within 0.0001"
- Surface finish from 6 to 16 microinches
- 23 through holes (5 tapped 3/8"-16 TPI and 18 plain)
Jesse
Reviewed in the United States on March 8, 2025
Pretty decent, haven’t checked dimensions, but these are affordable. Some of the holes on the larger surface are threaded for fixturing.
Toolman
Reviewed in the United States on January 24, 2024
These had a very competitive price. Finish was good and they are very consistent on dimensions.
Happy Customer
Reviewed in the United States on June 2, 2020
These are incredibly useful for new woodworkers and craftsmen. I just used them to setup my new table saw. They allowed me to perfectly align my new blade with the fence and adjust the measuring tape to be spot on. Just et the blocks against the carbide tips and you know you are exactly 3 inches out. Much more accurate than a tape measure. Also allowed me to level my new zero clearance insert exactly by using the block as a rocker. Incredibly useful for setting up quick cuts at exact 1 inch increments.
aBuyer
Reviewed in the United States on November 27, 2020
I was surprised, but I mic'd these out with .0001 resolution micrometers across all sides and they were very accurate and quite well matched. Worst case delta between the blocks was .0002" on one 3" side, but all others were within .0001". Absolute measurements on all sides were between .0000" and .0003" of spot on. Surface plate measurements across both blocks with a dial indicator showed no more than .0002" variation.As others have pointed out, the through-holes in the block are not .375", but for my applications this is not an issue. And there are workarounds if this is an issue. For the price I paid, the accuracy greatly exceeded expectations. I would buy again.
Tinkerpunked
Reviewed in the United States on February 19, 2016
I bought these mainly for the purpose of squaring up my table saw blade and drill press table for wood working projects. They appear to be square enough for anything I will ever use them for. This is my first set of 123 blocks. I'm deducting two stars because it was always my understanding that the unthreaded holes in the blocks were meant to pass a bolt through them that could be threaded into the other block. The 5 threaded holes are made for a 3/8" bolt, which works fine, but the bolt will not fit through the unthreaded holes. This limits the configurations that the blocks can be bolted together in and basically makes the 18 unthreaded holes useless. It might as well just be a 5 hole set. Not a huge deal since I will probably never use them bolted together for anything, but still not the way 123 blocks are intended to operate.I bought the 23 holes set just in case I would need to bolt them together for some reason. Now I wish I would have just bought a solid set with no holes.
Margaret Hammar
Reviewed in the United States on June 10, 2015
I bought these 1-2-3 blocks for use in Woodworking and I just keep finding more uses for them. While they are not traditionally seen as a wood working tool, I'm converting my friends over to using them as well. It's very useful to have an accurate measure of an inch or two when wood working. They work great as stop blocks for clamping to miter saws, and they are especially useful when clamped to a table saw fence so you can make repeatable cuts using your fence and miter gauge. You can't use the miter gauge alone with the fence as there is a possibility of the offcut binding between the blade and the fence. Using a 1-2-3 block you can clamp it ahead of the saw blade to the fence, and still use the readout on your fence. If you clamp it in the orientation so the block is 1" wide, just add 1" to any measurement you want to cut with your fence and it's so easy. I checked these blocks when I got them using a Mitutoyo dial caliper and they were in spec. I have not tried using the threaded holes so I cannot comment on their quality or accuracy however.
Clevor
Reviewed in the United States on December 24, 2014
I received these 1-2-3 blocks from Amazon together with a 0-3" digital micrometer kit from iGauging, so I decided to check tolerances on the blocks I received. The blocks were wrapped in a paper material saturated with rust preventative, so no need to worry about rust when receiving them.I first eyeballed the blocks carefully. Machining looks to be excellent, with the chamfered edges of each side of the block of fairly uniform width, although finished to a rough grit. But you won't see a wider chamfer on one edge or another, or see a chamfer increasing in width along the same edge as you'd expect for really cheaply machined products with poor, if any quality control. All the holes in the block were uniformly threaded on one end and precisely located.Now for the tolerances. The mike kit I bought has a resolution to 0.00005". The advertised tolerance on this kit is +/- 0.0001", which is why I bought these particular blocks, as most blocks only advertise to 0.0002. I found the tolerances on each side of the blocks in my set to be from 0.0000 to 0.0001". In many instances, tolerance was off to 0.00005" or less! I was hoping to use these cheap 1-2-3 blocks as calibration standards for my depth micrometer and looks like they are just the ticket. Even stacked to 6" with two blocks lengthwise, I might be off maybe 0.0001". Bought another set so I get hopefully get blocks off the same production run.
RichT
Reviewed in the United States on July 20, 2013
Product arrived on time. Preceeded my needs as I an still disposing of removed H/W floor. I have received my new (4th) router and table to provide the variable speed required by my new bits. The soft-start won't hurt anything I assume. This way I can keep two router set-ups and keep my baby Ridgid laminate trimmer available as needed.I have found an unrelenting perfectionist trait within myself hence the old fashioned standby for set-ups. I will validate all settings by digital standards anyway. Once an Engineer, always an engineer.Upon initial impression and measurements, I am expected solid results. As I am making my own flooring mouldings to my exacting requirements, not to mention wainscoting from scratch on the kitchen cabinet ends instead of the "fake" door decorative option, I will insist my personal efforts to be flawless.I perceive these blocks to be a basic, useful tool as needed, but required their precision as stated. Initial impression seems to validate that perception.. Happy with the purchase up to this point in time.
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