Spi 13-183-9 Angle Block 4 Inch Steel 30 60 90 Degree

Product Description

The SPI 13-183-9 is a steel angle block designed for precision layout, inspection, and machining setup work. It provides three reference angles — 30, 60, and 90 degrees — in a single 4-inch long, 1/4-inch thick block, making it a compact and versatile tool for metalworking and metrology applications. Accuracy is rated to 10 minutes of arc, which suits general-purpose angular reference tasks on the shop floor or inspection bench. Machinists, toolmakers, and quality technicians use this type of block when setting up workpieces, verifying angular features, or establishing reference planes during surface plate work.

This angle block is suited for use in machine shops, tool rooms, and quality control environments. It is typically used on surface plates or milling machine tables to position and hold workpieces at precise angles during layout or inspection. Its compact size and defined angular faces make it practical for both small-part work and use as a reference standard for angular gauging. The block is non-magnetic, which keeps it from attracting chips or interfering with sensitive measuring instruments nearby.

Key Features

• Three reference angles in one block: 30, 60, and 90 degrees
• 10-minute arc accuracy for general-purpose angular reference
• 4-inch overall length provides stable contact surface
• 1/4-inch thickness keeps the block lightweight and easy to handle
• Steel construction for durability in shop environments
• Non-magnetic — will not attract ferrous chips or debris

Compatibility

Designed as a general-purpose angular reference block for use in standard machine shop, toolroom, and inspection setups where 30, 60, or 90 degree angular references are required.

Installation Notes

Angle blocks of this type are set up by machinists and toolmakers — no licensed trade certification is required, but familiarity with surface plate technique and angular measurement principles is expected. Clean all mating surfaces before use to ensure accurate seating. Handle steel precision tools with care to avoid nicks or burrs on reference faces, as surface damage will degrade accuracy. Store separately from heavy tooling to protect the reference faces.