Starrett 52645 Steel Rule 6 Inches 4R Graduation

Product Description

The STARRETT 52645 is a 6-inch spring-tempered steel rule designed for precise linear measurement in trade and workshop environments. Built from spring-tempered steel with a regular steel finish, it delivers consistent rigidity and long-term durability under daily use. The rule features 4R graduation — four scales covering 8ths, 16ths, quick-reading 32nds, and 64ths of an inch — laid out in a single row of inch figures for fast, unambiguous reading. At 3/4 inch wide and 3/64 inch thick, it fits easily in a tool pouch or shirt pocket. Machinists, pipefitters, HVAC technicians, and electricians reach for this rule when layout and verification work demands clean, readable graduations on a compact, rigid blade.

The 52645 is suited for residential and commercial trade work wherever a short, precise rule is needed. It performs well in tight spaces — inside electrical panels, cabinet interiors, pipe runs, and duct openings — where a full 12-inch rule is unwieldy. The quick-reading 32nds scale reduces eye strain and speeds up repetitive measurement tasks on the job site or at the bench.

Key Features

• 6-inch blade length in spring-tempered steel for consistent rigidity
• 4R graduation: 8ths, 16ths, quick-reading 32nds, and 64ths scales
• Single row of inch figures for fast, unambiguous reading
• 3/4 inch wide blade fits standard tool pouches and pockets
• 3/64 inch blade thickness keeps it slim and lightweight
• Regular steel finish provides a satin-chrome-style surface that reduces glare

Compatibility

Designed as a standard short-form machinist rule suitable for general layout, inspection, and measurement tasks across HVAC, plumbing, electrical, and mechanical trades.

Installation Notes

No installation is required for this measuring tool. Store the rule flat or in a protective sleeve to prevent edge damage and maintain graduation legibility. Avoid contact with grinding debris or abrasive surfaces that could wear the markings. Clean with a dry or lightly oiled cloth to preserve the finish.

Technical Specifications

• Length: 6 inches
• Width: 3/4 inches
• Thickness: 3/64 inches
• Construction: Spring-Tempered Steel
• Finish: Regular Steel
• Graduation Type: 4R
• Graduations: 8ths, 16ths, Quick-Reading 32nds, 64ths
• Style: Single Row of Inch Figures

Standard Information

• Brand: STARRETT
• Manufacturer Part Number: 52645