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Arrives: Tuesday, Jan 26 Details
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BL-123 Pair of 1" x 2" x 3" Precision Steel 1-2-3 Blocks

4.8 out of 5 stars 1,914 ratings
Amazon's Choice recommends highly rated and well-priced products.
Amazon's Choice for "1 2 3 blocks set"

Price: $22.00 FREE Shipping
Get free shipping
Free 5-8 day shipping within the U.S. when you order $25.00 of eligible items sold or fulfilled by Amazon.
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Original version
Metal Type Alloy Steel
Handle Material Alloy Steel
Brand 1-2-3 Blocks

About this item

    This fits your .
  • Make sure this fits by entering your model number.
  • 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
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Customer ratings by feature

Thickness
4.84.8
Accuracy
4.84.8
Value for money
4.74.7
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Frequently bought together

  • BL-123 Pair of 1" x 2" x 3" Precision Steel 1-2-3 Blocks
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Total price: $78.23
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Product description

Color:Original version

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


Product information

Color:Original version

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4.8 out of 5 stars
4.8 out of 5
1,914 global ratings
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Top reviews from the United States

Reviewed in the United States on October 27, 2016
Color: Original versionVerified Purchase
183 people found this helpful
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Reviewed in the United States on June 26, 2019
Color: Original versionVerified Purchase
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25 people found this helpful
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Reviewed in the United States on March 31, 2018
Color: Original versionVerified Purchase
27 people found this helpful
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Reviewed in the United States on October 14, 2019
Color: Original versionVerified Purchase
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13 people found this helpful
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Reviewed in the United States on September 29, 2017
Color: Original versionVerified Purchase
19 people found this helpful
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Reviewed in the United States on August 22, 2017
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Reviewed in the United States on December 4, 2016
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Reviewed in the United States on October 28, 2016
Color: Original versionVerified Purchase
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Top reviews from other countries

Tom
4.0 out of 5 stars To Spec!
Reviewed in the United Kingdom on July 28, 2020
Color: Original versionVerified Purchase
Customer image
4.0 out of 5 stars To Spec!
Reviewed in the United Kingdom on July 28, 2020
The basic specification for these 1-2-3 blocks is:

Size within +/- .0002"
Flatness and parallelism within .0002"
Squareness on all sides is 0.0003" per inch
Pairs are matched to a tolerance of 0.0002"

I bought these, more expensive, versions of standard 1-2-3 blocks, more for experimentation with precise measurement then any real need for such precision tools. They've already seen use, but cheaper versions would probably have done me. However, having bought them I thought I might as well see how closely they measure up.

I don't have Inch specific gauge blocks, but given that imperial to metric is a very simple conversion, I used what I had (Moore & Write Grade 1 metric gauge blocks, recently calibrated, Mitutoyo Grade 1 surface block (brand new) and my trusty Mitutoyo 543-391B Digimatic Indicator) to make comparative measurements and see if these blocks fall into spec'

The long and the short of it is that, within the bounds of my amateur measurements, they certainly did.

As you can see from the recorded measurements (photo attached) the 2 inch axis of both blocks fell outside of the published specifications, but the reality is that we're talking about fractions of a tenth (0.0001") which is, without question, way outside of the accuracy that I can claim to be able to measure.

I don't have any tools that will accurately measure squareness, but I do have a precision Moore and Write engineers square to check the blocks with, and I couldn't find any issues on visual inspection.

The chamfering on the holes and the block walls is far from fabulous, and I would have preferred better concentricity on the hole chamfers and a deeper cut, but otherwise the finish of the blocks is very good, so no complaints there.

The only real issue is one that maybe 95% of all blocks of these type have, which relates to the inherently poor design. Specifically, the non-threaded holes are not big enough to allow a 3/8-16 threaded bolts clearance.

The upshot of this is that bolting these blocks together, to make a right-angle shape for example, can't be achieved with a standard 3/8-16 threaded bolt or screw. So annoying!

You can just about do it with an M6 bolt/nut which will facilitate this, but the countersink on the holes isn't deep enough to allow this technique to leave a flat surface with a standard countersink M6 bolt. Why doesn't anyone manufacture 1-2-3 blocks with clearance holes of a suitable size?

In any case, while I might splurge on a cheap set of 1-2-3 blocks for comparison, these more expensive BL-123 blocks do what they said they would within the nominal tolerances published, with a reasonable finish.

They took a while to get here, but very happy with my purchase.
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Frank Opinion
5.0 out of 5 stars Bargain
Reviewed in the United Kingdom on July 27, 2019
Color: Original versionVerified Purchase
KMINA
5.0 out of 5 stars Worthwhile Purchase
Reviewed in the United Kingdom on August 12, 2019
Color: Original versionVerified Purchase
DAVID N. ROBERTSON
5.0 out of 5 stars As described second hand cleaned up well.
Reviewed in the United Kingdom on June 18, 2019
Color: Original versionVerified Purchase
Jill B.
5.0 out of 5 stars Excellent
Reviewed in the United Kingdom on June 5, 2019
Color: Original versionVerified Purchase
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