Products for bench top machinists | LittleMachineShop.com

Blocks, 1-2-3, Universal 11 Hole Set

Blocks, 1-2-3, Universal 11 Hole Set - Main image
$58.47 $89.95 In stock

These 1-2-3 blocks are ground and case hardened on all sides to 55-62 Rc. The blocks are 1" x 2" x 3".

They are parallel within 0.0002" and have a .0001" to .0003" over allowance for nominal lapping.

Each set includes two matched blocks. These blocks can be bolted together using 5/16"-18 socket head cap screws (not included).

The blocks have 11 holes, six drilled through with deep recesses for clamping, and five tapped holes which are threaded 5/16"-18 NC.

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Customer Reviews (4.8 / 5 · 5 reviews)

Ella ★★★★★

The parallel accuracy right out of the box is spot on—I checked them with a tenth indicator and they’re within the claimed tolerance. These will make setup work much faster on the mill.

Amelia M. ★★★★★

The ground finish on these blocks is beautiful right out of the box. I checked them against my surface plate and they're dead flat within spec, no lapping needed.

Evelyn Z. ★★★★★

I've been using these as setup blocks for my surface grinder and the 0.0002" parallelism makes leveling jigs incredibly repeatable. The case hardened surface hasn't shown any wear even after frequent clamping and indicating.