Stewart Fastener MDB-12 Magnetic Nut Setter 3/8 in Drive

Product Description

The STEWART FASTENER MDB-12 is a magnetic nut setter designed for fast, secure fastener driving in trade and light industrial applications. Built around a 3/8 inch drive with a 2-9/16 inch overall length, this tool keeps nuts firmly seated on the bit during placement, reducing dropped hardware and improving one-handed operation. It is well suited for HVAC technicians, electricians, and plumbers who routinely drive hex-head fasteners during equipment installation, panel work, and rough-in tasks where speed and control matter.

This magnetic nut setter fits standard 3/8 inch drive power tools and impact drivers commonly used in residential and light commercial trade work. The 2-9/16 inch length provides enough reach for recessed fastener locations without adding excessive flex or runout. It is a practical addition to any service kit where hex-head sheet metal screws, machine bolts, or equipment mounting hardware are regularly driven.

Key Features

• 3/8 inch drive fits standard impact drivers and drill/driver chucks
• 2-9/16 inch overall length for moderate reach into recessed fastener locations
• Magnetic tip retains nuts and hex-head fasteners during placement
• Suitable for sheet metal screws, machine bolts, and equipment mounting hardware
• Compact form factor for use in confined spaces common in HVAC and electrical rough-in work

Compatibility

Designed as a standard 3/8 inch drive magnetic nut setter compatible with 3/8 inch drive power tools and drill/driver chucks used in HVAC, electrical, plumbing, and general trade installation work.

Installation Notes

This nut setter is installed and removed from 3/8 inch drive tools without special tools. Verify the drive chuck is fully locked before operating. Inspect the magnetic tip periodically for metal debris buildup, which can affect seating and retention. Use appropriate PPE when operating power drivers in proximity to live electrical panels or pressurized systems.

Technical Specifications

• Drive Size: 3/8 inch
• Overall Length: 2-9/16 inches
• Magnet Type: Magnetic tip
• UPC: 662352210942

Standard Information

• Brand: STEWART FASTENER
• Manufacturer Part Number: MDB-12