Spi 13-938-6 Steel Rule 18 Inch 4R Graduation

Product Description

The SPI 13-938-6 is an 18-inch steel rule designed for precision layout and measurement work in machine shops, fabrication facilities, and general trade applications. Constructed from tool steel with a satin chrome-plated finish, this rule delivers clear, durable graduations across four scales: 1/16, 1/32, 1/64, and 1/8 inch. At 1-1/8 inches wide and 0.040 inches thick, it offers a stable, rigid measuring surface suited for scribing lines, checking dimensions, and transferring measurements. Machinists, tool and die makers, sheet metal fabricators, and HVAC technicians who require accurate fractional inch measurements will find this rule a reliable bench and field tool.

The 13-938-6 is appropriate for use in residential and commercial trade environments where precise linear measurement is required. Its horizontal scale orientation makes it well suited for standard bench layout work. The included hook adds versatility for quick hookover measurements from a workpiece edge without repositioning the rule. Non-magnetic construction ensures the rule is not affected by contact with magnetized workpieces or tooling.

Key Features

• 4R graduation style with four scales: 1/16, 1/32, 1/64, and 1/8 inch
• Tool steel construction with satin chrome-plated finish for durability and readability
• 18-inch overall length provides extended measurement range
• 1-1/8-inch width offers a stable measuring surface for layout work
• Hook included for hookover measurements from workpiece edges
• Non-magnetic for use around magnetized tooling and components

Compatibility

Designed as a standard fractional-inch steel rule suitable for general machinist, fabrication, and trade measurement applications requiring 4R graduation in an 18-inch format.

Installation Notes

No installation is required for this hand tool. Store the rule flat or in a protective sleeve to prevent edge damage and maintain graduation legibility. Avoid contact with abrasive surfaces that could wear the chrome plating and obscure scale markings. Periodic cleaning with a light machine oil cloth will help prevent corrosion on the tool steel substrate.