SPI 13-672-1 2x3x4 in 0.0003 in 23-Hole 2-3-4 Block Pair Set
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The SPI 13-672-1 is a new matched pair of 2-3-4 blocks measuring 2 in × 3 in × 4 in, ground to a flatness and parallelism tolerance of 0.0003 in, suitable for precision workholding, layout, and squaring operations on surface grinders, milling machines, and inspection surface plates. Each block features 23 threaded holes on multiple faces to accept clamps, studs, and fixturing hardware, enabling versatile part clamping and setup configurations. The blocks are hardened alloy steel with a black oxide finish for corrosion resistance and are supplied as a matched pair wrapped in protective film inside an SPI branded red plastic storage case. SPI part number 13-672-1 corresponds to catalog reference 7204145/003E; country of origin is China as marked on the outer carton.
Product Specifications
| Brand | SPI |
| MPN | 13-672-1 |
| Catalog / Ref # | 7204145/003E |
| Block Dimensions | 2 in x 3 in x 4 in |
| Parallelism / Flatness Tolerance | 0.0003 in |
| Number of Holes per Block | 23 |
| Quantity | Pair (2 blocks) |
| Material | Hardened alloy steel |
| Finish / Treatment | Black oxide |
| Storage Case | Red plastic case included |
| Country of Origin | China |
| Condition | New |