Starrett 52660 Steel Rule 6 in 4R Graduation Rigid

Product Description

The STARRETT 52660 is a rigid steel rule designed for precise linear measurement in trade and shop environments. Manufactured from spring steel with a satin chrome-plated finish, this rule measures 6 inches in overall length and 3/4 inch in overall width at 0.0500 inches thick. The 4R graduation style provides four scales in a single rule — 1/16, 1/32, 1/64, and 1/8 inch — allowing machinists, pipefitters, electricians, and field technicians to take multiple resolution measurements without switching tools. The horizontal scale orientation keeps readings fast and direct.

This rule is suited for bench work, layout tasks, and field measurement in HVAC, plumbing, electrical, and general mechanical trades. Its rigid construction makes it reliable for scribing lines, setting calipers, and checking part dimensions. The compact 6-inch length fits tool pouches and service bags without issue, making it a practical carry item for service technicians working in tight equipment rooms or on mechanical equipment.

Key Features

• Spring steel construction provides durability and resistance to flex during measurement
• Satin chrome-plated finish reduces glare and resists corrosion in damp environments
• 4R graduation style includes four scales: 1/16, 1/32, 1/64, and 1/8 inch
• Rigid build maintains straight-edge integrity for layout and scribing applications
• Compact 6-inch overall length fits standard tool pouches and service kits
• Non-magnetic, no hook — straightforward layout and measurement tool

Compatibility

Designed as a general-purpose rigid steel rule for trade professionals requiring 1/64-inch measurement resolution in a 6-inch format.

Installation Notes

No installation is required for this measuring tool. Keep the rule clean and dry to maintain the satin chrome finish and scale legibility. Avoid dropping on hard surfaces, as impact can introduce bow or distortion that compromises measurement accuracy. Replace if the rule shows visible bend, worn graduation markings, or edge damage.