SPI 1-2-3 / 2-3-4 / 2-4-6 Block Sets
$62.75 – $318.90
SPI Swiss Precision Instruments: 1-2-3 / 2-3-4 / 2-4-6 Block Sets.
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SPI 1-2-3 / 2-3-4 / 2-4-6 Block Sets Features:
Hardened steel to RC 55-60, ground to surface finish 6-16 microinches
Matched 1-2-3 and 2-3-4 Blocks
Squareness of all sides within 0.0001" per inch on 1-2-3 blocks, 0.0003" per inch on 2-3-4 blocks
Five tapped holes (3/8" - 16), 18 untapped holes (0.340" dia.)
Matched 2-3-4 Blocks
Squareness of all sides within 0.0003" per inch
Five tapped holes (5/8" - 11), 18 untapped holes (0.520" dia.)
