Spi Z9009 Caliper Centerline Attachment

Product Description

The SPI Z9009 is a caliper centerline attachment designed to extend the measuring capability of standard dial and vernier calipers. It mounts to the caliper jaw and allows the user to locate and transfer centerline measurements on round or cylindrical workpieces. The attachment measures 2.187 inches in overall length and features a 0.141-inch slot width that secures it to the caliper beam. At 0.16 pounds, it is a lightweight, single-piece accessory suited for use in machine shops, manufacturing environments, and precision measurement applications. Machinists and quality control technicians are the primary users.

This attachment is intended for use with 4-inch, 6-inch, and 8-inch dial and vernier calipers. It is a practical add-on for any shop workflow that requires consistent centerline location on shafts, pins, holes, or similar cylindrical features without switching to a dedicated center-finding tool. It is packaged as a single piece and is sold individually.

Key Features

• 0.141-inch slot width for secure, consistent fit on caliper beam
• 2.187-inch overall length provides adequate reach for centerline transfer
• Compatible with 4-inch, 6-inch, and 8-inch dial and vernier calipers
• Lightweight at 0.16 pounds — adds minimal mass to the caliper
• Single-piece construction with no additional hardware required

Compatibility

Designed for use with 4-inch, 6-inch, and 8-inch dial and vernier calipers as specified by the manufacturer.

Installation Notes

Machinists and metrology technicians typically install this attachment. Slide the attachment onto the caliper beam through the slot and position it against the jaw before securing. Ensure the caliper is zeroed and the attachment is fully seated before taking measurements. Handle precision measuring instruments with care to avoid damage to the measuring faces or the attachment slot.