Lufkin 590GMN Brass Plumb Bob 20 Oz

Product Description

The LUFKIN 590GMN is a solid brass plumb bob designed for establishing true vertical reference lines on job sites. Weighing 20 ounces and measuring 150 mm (approximately 5.9 inches) in length, this tool delivers the mass and balance needed for accurate plumb readings in demanding field conditions. The body and point tip are both machined from brass, providing corrosion resistance and a consistent center of gravity. It is used by carpenters, masons, ironworkers, surveyors, and general contractors wherever a reliable gravity-referenced vertical is required.

This plumb bob suits residential and commercial construction applications including foundation layout, column alignment, stud wall plumbing, door and window frame installation, and structural steel positioning. The 20 oz weight class makes it appropriate for moderate to high-wind conditions where a lighter bob would swing excessively. The tip is fixed and non-replaceable, so the point is integral to the brass body. It is sold individually as a single unit.

Key Features

• Solid brass body and tip for corrosion resistance and long service life
• 20 oz weight provides stability in outdoor and elevated work conditions
• 150 mm (approximately 5.9 inches) length suits a wide range of layout tasks
• Fixed integral brass tip maintains precise point alignment
• Single-unit packaging for individual tool replacement or addition

Compatibility

Designed as a standard plumb bob for use with any compatible plumb bob line or string, suitable for general construction and layout work requiring a 20 oz gravity reference tool.

Installation Notes

A licensed or journeyman tradesperson in carpentry, masonry, or general construction typically deploys a plumb bob as part of layout work. Secure the line to a fixed overhead anchor point and allow the bob to hang freely until it stops swinging before taking a reading. Keep the bob away from air currents, drafts, and vibrating surfaces to ensure an accurate vertical reference. No power tools or electrical shutoffs are required for use.