Spi 13-958-4 Steel Rule 48 Inches 4R Graduation

Product Description

The SPI 13-958-4 is a rigid steel rule measuring 48 inches in overall length and 1-1/4 inches in overall width. It is finished in satin chrome plating, which reduces glare and improves readability under shop lighting conditions. The rule carries a 4R graduation style, providing four scales on a single blade for versatile measurement across fabrication, layout, and inspection tasks. At 0.0400 inches thick, the blade holds its shape without flexing during use. Machinists, tool and die makers, sheet metal workers, and quality control technicians will find this rule suitable for precision layout work on flat stock, castings, and assemblies.

This rule is designed for general-purpose linear measurement in machine shops, fabrication facilities, and industrial maintenance environments. The horizontal scale orientation and rigid construction make it appropriate for bench work, surface plate layout, and part inspection where a flexible rule would introduce measurement error. The 48-inch length accommodates large workpieces and long layout lines without the need for repositioning.

Key Features

• 4R graduation style provides four scales: 1/16, 1/32, 1/64, and 1/8 inch increments on a single rule
• Rigid blade holds a flat reference line across the full 48-inch length
• Satin chrome-plated finish reduces glare and resists corrosion from shop fluids
• 1-1/4 inch width provides a stable contact surface and easy scale reading
• No hook included, keeping the profile clean for direct contact measurement
• Non-magnetic construction for use near sensitive electronic components or magnetic workholding setups

Compatibility

Designed as a standard rigid steel rule for precision measurement and layout applications in machine shops, fabrication shops, and industrial maintenance environments.

Installation Notes

No installation is required for this measuring tool. Store the rule flat or in a protective sleeve to prevent nicking the graduated edge, which can affect readability and accuracy. Clean the blade with a dry or lightly oiled cloth to prevent surface corrosion over time. Do not use the rule as a prying or cutting tool, as damage to the edge will compromise measurement accuracy.