This ultra-precision 1 2 3 block pair comes with 5 pieces of 3/8"-16 socket head cap screws, 1 pair of 23-hole 1-2-3 blocks, and 1 hex key. The 23-hole feature provides more configuration than the other 1-2-3 blocks. The cap screws and the hex key saves you time on the setup of the machines. The 0.0001"/1" squareness, ±0.0001" height accuracy in pair, and ±0.0001" parallelism can give you much more accurate results. The 1-2-3 blocks are for both metalworking and woodworking. Everyone will love it as it is affordable, versatile, and convenient.

Accusize Ultra Precision 1-2-3 Blocks Set with Screws in Plastic Box, EG02-0408

Features

• With 23 Holes
• Squareness: 0.0001"/1"
• Parallelism: ±0.0001"
• Height accuracy in pair: ±0.0001"
• Hardness: HRC 56-60
• Finished from 6-16 micro inches
• Nominal tapping: 0.0001" to 0.0003"
• 23 holes; 5 holes tapped to 3/8-16 and others (8.9mm) are untapped
• Precision ground on all sides
• Squareness on all sides
• Surface finish
• Oversize to allow nominal tapping
• 5 socket head cap screws
• 1 hex key
• Packed in fitted strong Case

Accusize 1 2 3 blocks 25 50 75mm blocks, 2 4 6 blocks, 2 3 4 blocks, 23 holes, 11 holes, 1 holes, no hole

• Hardened steel, hardness HRC 50–60 on 6 sides
• Precision ground and hardened on all sides
• 11 holes consist of 5 tapped holes (5/16"-18 for EG02-0405 for clamping and 6 untapped holes drilled through)
• 23 holes consist of 5 tapped holes (3/8"-16 for EG02-0411 & EG02-0412, 5/8"-11" for EG02-0415 & EG02-0416) for clamping and 18 untapped holes drilled
• Drilled hole size: 0.500-0.501" for EG02-0406
• Cross drilling design gives minimum weight and maximum strength
• Extremely versatile for precision layout, grinding and set-up work
• Each set contains two matched blocks in pairs.

Mill Setup Tools

1-2-3 precision blocks are precision ground block at exactly 1 inch by 2 inches by 3 inches. The 2-3-4, 2-4-6, and 25-50-75mm blocks apply the same principle. The blocks are accurately ground, so they are the standard that machinists use in terms of setting up, doing fixturing, touching off tools. They can be used with various milling machines setup tools such as height gauge and test indicators in inspection for calibration and measuring.

Count of holes of Accusize Precision Blocks

• The holes on the precision blocks enable them to be bolt together into different configurations. So the more holes a block has, the more configurations the pair of the blocks can create.
• The precision blocks with fewer holes or without holes have advantages. During the milling application, the craps, chips, abrasives from the wheel, coolant, etc., could enter the blocks holes. It lowers the total productivity of the work. The concerns can be solved by using the blocks with fewer holes or even no holes.

The following are the all Accusize Precision Blocks: