Spi Z9010 Caliper Centerline Attachment 12 in Calipers

Product Description

The SPI Z9010 is a caliper centerline attachment designed to extend the measurement capability of 12-inch dial and vernier calipers. The attachment mounts directly to the caliper jaws and allows the user to locate and transfer centerline measurements on round stock, shafts, and bores. It measures 2-3/4 inches in overall length and features a 0.156-inch slot width to seat securely against the caliper. Machinists, tool and die workers, and precision measurement technicians use this accessory in shop environments where accurate centerline positioning is required without additional layout tools.

This attachment is suited for use in machine shops, toolrooms, and fabrication environments where caliper-based centerline layout is a routine task. It provides a repeatable method for finding the center of cylindrical workpieces directly from the caliper reading. The single-piece construction keeps the workflow compact and eliminates the need for a separate center finder during setup operations.

Key Features

• Designed for use with 12-inch dial and vernier calipers
• 2-3/4 inch overall length for stable jaw contact
• 0.156-inch slot width for secure caliper jaw fit
• Single-piece accessory — no assembly required
• Enables direct centerline transfer from caliper measurement

Compatibility

Designed for use with 12-inch dial and vernier calipers as a centerline measurement accessory.

Installation Notes

Machinists and metrology technicians install this attachment by seating the slot over the caliper jaw. Ensure the caliper is zeroed and the jaws are clean before attaching. Do not overtighten or force the attachment onto the jaw, as this can affect measurement accuracy. Handle precision measurement accessories with care to avoid burrs or surface damage that would compromise fit.