SPI 991-233-4 2.50-3.00in 13-551-7 Three-Point Bore Gauge Head
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This new SPI 991-233-4 is a replacement bore gauge head only, covering a 2.50-3.00 in (2.5-3") measuring range, and is engraved with 0.00005" graduation. The package label reads 2.50-3.00 F/13-551-7 HEAD ONLY, identifying it as the head for the SPI 13-551-7 bore gauge. It has a satin chrome finished body with a spring-loaded plunger at the top and two pinned side contact lugs. The base is a triangular housing secured with six black slotted screws, consistent with a three-point contact design. The listing is for the head only and does not include a gauge handle, indicator or setting ring. Part number marking on the bag is 991-233-4, and an additional label reads 73100687.
Product Specifications
| Brand | SPI |
| MPN | 991-233-4 |
| Alternate Part Number | 73100687 |
| Measuring Range | 2.50-3.00 in |
| Graduation | 0.00005 in |
| For Use With | SPI 13-551-7 Bore Gauge |
| Configuration | Head Only |
| Contact Points | 3 |
| Unit System | Inch |
| Finish | Satin Chrome |
| Fasteners | 6 black slotted screws on base |