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BL-123 Pair of 1" x 2" x 3" Precision Steel 1-2-3 Blocks

4.7 4.7 out of 5 stars 3,642 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Cabinet & Furniture Pulls by 1-2-3 Blocks

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Purchase options and add-ons

Material Metal
Brand 1-2-3 Blocks
Color Original version
Product Dimensions 3"L x 2"W
Number of Pieces 1
Style
Modern
Handle Type
Lever
Shape
Rectangular
Finish Type
Polished

About this item

  • Our Part # ALL-55500
  • Heat treated and case hardened to HRC 57-62. Made of precision-grade tool steel hardened and ground on all 6 sides of block
  • Accuracy and squareness on all sides within .0001"-.0002"
  • 23 holes includes (5) 3/8-16 threaded holes for clamping and (18) untapped holes Cross drilling design allows for efficient use of lower weight with maximum strength, Dimensions- 1" x 2" x 3", 2.1 lbs. weight

Additional Details

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 1 x 1 x 3 inches; 2 Pounds
  • Item model number ‏ : ‎ 54988
  • Date First Available ‏ : ‎ February 13, 2005
  • Manufacturer ‏ : ‎ TFT Tools
  • ASIN ‏ : ‎ B00092CJC6
  • Customer Reviews:
    4.7 4.7 out of 5 stars 3,642 ratings

Product Description

1 Matched Pair Ultra Precision 1-2-3 Blocks 23 Holes .0001" Machinist 123 Jig

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Customer reviews

4.7 out of 5 stars
4.7 out of 5
3,642 global ratings

Customers say

Customers like the performance, square, accuracy, and ease of use of the hardware handle. They mention that it works great, the dimensions and angles are perfect, and it's really great for accurate depth measurement. They also appreciate the quality, value, and appearance. That said, opinions are mixed on the holes.

AI-generated from the text of customer reviews

257 customers mention231 positive26 negative

Customers like the quality of the hardware handle. They say the blocks are well-made, accurate, and built to last. Some say they make good paper weights and are good for basic machine setups.

"...to a professional grade (>$100) sets, these blocks can be used for material holding without concerns of scratching, denting or damaging..." Read more

"...However none of the threads looked mangled, and appeard to be nicely milled.The price is great, they arrived fast, and the quality seems good...." Read more

"...I don’t know if I just got lucky or if the quality control is just that good, but I’m more than pleased with this set." Read more

"Good 123 block if you’re not expecting aerospace tolerances." Read more

184 customers mention180 positive4 negative

Customers appreciate the value of the hardware handle. They mention that it is a cheap tool that saves time and is worth the money. Some customers also appreciate the accuracy for the money and find it handy for quickly setting up tools.

"...Due to the low price compared to a professional grade (>$100) sets, these blocks can be used for material holding without concerns of scratching..." Read more

"...The price is great, they arrived fast, and the quality seems good. Takes the place of a few other woodworking tools...." Read more

"...can measure they are within a tenth of being perfect… truly astonishing for the price...." Read more

"...These are cheap and they work. Keep them corrosion free, don't drop them and they'll last forever." Read more

134 customers mention123 positive11 negative

Customers are satisfied with the accuracy of the hardware handle. They mention that it's heavy and appears to be precise. The 1-2-3 blocks look fine and measure out pretty accurately. They are really great for accurate depth measurement and provide instant precision results. They're useful for measurements and setup, and aid with measuring and just as weights. Overall, customers are happy with the quality and functionality of the product.

"I use them for tool setup in my woodworking shop. Very precise...." Read more

"These are wonderful for measuring. Stack them together to get very accurate blade/fence spacing on your table saw...." Read more

"...They aid with measuring and just as weights...." Read more

"Very useful for measurements and setup." Read more

107 customers mention107 positive0 negative

Customers find the hardware handle easy to use. They mention it's very handy for setting up saw blades, fences, drill presses, and quickly measuring whole inches. They also say that they are excellent tools and an asset to the shop for setup and clamping. Overall, customers are satisfied with the ease of use.

"...However for hobbyists or your average shop, these are a great and useful addition. I always have at least 4 around for machine and vise setup...." Read more

"...of uses in mind for these blocks, but I've found them to be useful for lots of purposes." Read more

"...These make for fast and easy setup in those cases." Read more

"Easy to use, easy set up on multiple tools, maybe they should add a clamp to connect to the fence or table" Read more

66 customers mention66 positive0 negative

Customers are satisfied with the performance of the hardware handle. They say that the paths have.0005 tolerances, they have worked great, and are flawless.

"...However, for my intended usage they work fine...." Read more

"...I used them for squaring up a 3d printer and they worked perfectly. I dinged it a star because my set didn’t come in a wooden box. Just a paper box." Read more

"...plastic sheets at a nice 90 degree orientation while bonding and they work great...." Read more

"...These are cheap and they work. Keep them corrosion free, don't drop them and they'll last forever." Read more

64 customers mention61 positive3 negative

Customers are satisfied with the square. They say it is dimensionally correct, super square, and flat. The holes are consistent, and the angles are perfect. They also mention that it is great for when space is tight and they can't fit a level in place. They appreciate that it helps in making small projects square and in positioning holes for mounting small pieces. Overall, customers are happy with their purchase and recommend it to others.

"...None found. The dimensions and angles are perfect...." Read more

"This is just what I wanted. Right size, weight, etc...." Read more

"...They are square and stay where they are placed to check squareness...." Read more

"...and the threading was so rough that I had to chase them all, but they are square, the edges are parallel (yes, based on being square), there was no..." Read more

52 customers mention48 positive4 negative

Customers like the appearance of the hardware handle. They mention that it is a beautiful product, unique, and has a good finish. The chamfered edges appear to have been machined, and the machined surfaces are free of imperfections.

"...So I've had these blocks for almost two years now. No corrosion, still look fine. Perfectly happy with the purchase...." Read more

"...Designed well and built to last. I bought these 3 years ago and they are still like new. Their use has really stepped up my capabilities." Read more

"...The blocks are heavy and free of blemishes...." Read more

"...Other than the holes they seem to be of good quality, nice and heavy with edges flattened evenly." Read more

56 customers mention19 positive37 negative

Customers have mixed opinions about the holes in the hardware handle. Some mention that some holes are threaded for mounting a precison depth gauge or dial indicator, while others say that the holes are a total joke, different sizes in random locations, and not aligned.

"The OD is 0.0 - .002, no complaints there. The holes are a total joke, different sizes in random locations...." Read more

"...However none of the threads looked mangled, and appeard to be nicely milled.The price is great, they arrived fast, and the quality seems good...." Read more

"...had some dents in the edges that had to be stoned out and the threading was so rough that I had to chase them all, but they are square, the edges..." Read more

"...squareness of the table saw blade, or depth of cut... But, the holes are useless...." Read more

Not perfect… But doesn’t have to be
4 Stars
Not perfect… But doesn’t have to be
These are not perfect, and their only slightly outside of the stated accuracy. That being said, if you need perfect 1-2-3 blocks, you should probably spend more than $20 on set. These are close enough that their accuracy far exceeds my need. These are perfect for my needs and perfect enough for 99% of the people shopping for these. If you are high precision machinist you’re probably not even reading this review. But if you’re just starting out or use them for any one of the dozens of uses these things have that have nothing to do with machining. I used them for squaring up a 3d printer and they worked perfectly. I dinged it a star because my set didn’t come in a wooden box. Just a paper box.
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5.0 out of 5 stars I use these all the time...
Reviewed in the United States on February 18, 2015
This is perfect when a square block of steel is needed. I use them as calibration standards for my woodworking tools. They're not good enough for high precision metal work, but they're perfect to calibrate the scale on my miter saw fence...when I stack two blocks between the saw blade and the stop and the scale is adjusted to 6", I know that the rest of the scale is also dead on. I'm also using four of these, bolted to the saw bed, to hold the miter saw fence exactly vertical and at right angles to the blade path. (BTW, if you look at the picture, the fence pieces are normally much closer together...barely enough to clear the saw blade.)

Want to see if your cheap calipers are reading right? Grab one of these and measure it. At 0.0002" accuracy, they're far more accurate than any inexpensive measuring tool.

These are cheap and they work. Keep them corrosion free, don't drop them and they'll last forever.
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174 people found this helpful
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Top reviews from other countries

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Ron Estabrook
5.0 out of 5 stars Perfect
Reviewed in Canada on February 21, 2021
jorge beltran sanchez
5.0 out of 5 stars cubos de precision
Reviewed in Mexico on April 20, 2019
Gennari G.
5.0 out of 5 stars Da riprendere
Reviewed in Italy on January 18, 2020
Frank Opinion
5.0 out of 5 stars Bargain
Reviewed in the United Kingdom on July 27, 2019
One person found this helpful
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Frederic bernhard
4.0 out of 5 stars Bon produit
Reviewed in France on May 25, 2019