Spi 13-873-5 Flexible Steel Rule 18in 16R Graduation

Product Description

The SPI 13-873-5 is an 18-inch flexible steel rule designed for precise linear measurement in professional trade and industrial applications. The rule features a 16R graduation pattern with four scales: 1/32, 1/64, 1/100, and 1/50 inch, covering a wide range of measurement needs in a single tool. The satin chrome-plated finish reduces glare under shop lighting and resists corrosion from contact with coolants and oils. At 0.0200 inches thick, the blade flexes without permanent deformation, allowing measurements on curved or irregular surfaces. This rule is a standard hand tool carried by machinists, pipefitters, HVAC technicians, and sheet metal workers.

The 13-873-5 is suited for layout and inspection work in fabrication shops, mechanical rooms, and field service environments. The 3/4-inch width provides a stable reading surface while keeping the profile narrow enough for confined spaces. The horizontal scale orientation and silver satin finish make graduation lines easy to read under variable lighting conditions. No hook or magnetic features are included, making this a straightforward layout and transfer rule for bench or field use.

Key Features

• Four graduation scales: 1/32, 1/64, 1/100, and 1/50 inch on a single blade
• Flexible steel construction allows measurement on curved or uneven surfaces
• Satin chrome-plated finish reduces glare and resists corrosion
• 0.0200-inch blade thickness provides flexibility without permanent set
• 3/4-inch blade width offers a stable, easy-to-read surface
• Horizontal scale orientation for consistent, accurate readings

Compatibility

Designed as a general-purpose flexible steel rule suitable for machining, fabrication, plumbing layout, HVAC ductwork measurement, and similar trade applications requiring fine inch-based graduations.

Installation Notes

No installation is required for this hand measuring tool. Store the rule flat or in a protective sleeve to prevent blade deformation and protect the graduated markings. Avoid using this rule as a cutting guide with high-force tools, as scoring the surface can damage graduation legibility. Clean with a dry or lightly oiled cloth to maintain the chrome finish.