The Simpson #3 Square Undersized-Drive 2 in. Power Bit 3-Pack delivers the precise fit that coated fastener applications demand. Simpson Strong-Tie engineered these industrial-grade driver bits to engage securely with Simpson Strong-Tie fasteners, eliminating the cam-out and stripping problems that plague substandard bits on the jobsite. The undersized drive geometry accounts for the added thickness that coatings introduce into the fastener recess, keeping each drive smooth and consistent from the first screw to the last.

Key Features

• Undersized drive design - accommodates the extra material that coatings add to a fastener recess, ensuring a snug, secure engagement every time rather than a sloppy fit that leads to slipping
• #3 Square, Undersized drive type - matches the specific recess geometry of compatible Simpson Strong-Tie coated fasteners, so the bit seats fully and transfers torque efficiently
• 2 in. bit length - provides enough reach for comfortable power-tool use while keeping the bit rigid and stable under driving pressure
• Industrial-grade construction - built to outperform substandard bits that are commonly prone to cam-out and stripping, meaning fewer bit changes and more consistent results throughout the workday
• 3-piece pack - keeps backup bits on hand so work continues without interruption when a bit reaches the end of its service life

Why This Product

• Purpose-built for coated fasteners - the undersized designation is not a generic size choice; it is a deliberate engineering decision by Simpson Strong-Tie to match the dimensional reality of coated fastener recesses, giving installers a tool that actually fits the hardware they are driving
• Reduced cam-out risk - Simpson Strong-Tie industrial-grade driver bits are designed to resist the cam-out and stripping that substandard square-drive bits commonly cause, protecting both the fastener head and the workpiece surface
• Optimized compatibility with Simpson Strong-Tie fasteners - precision sizing is intended to work at its best with Simpson Strong-Tie coated fasteners, making this bit a natural pairing for anyone already using Simpson Strong-Tie connector hardware and structural screws
• Multi-piece value for continuous use - with three bits included, a crew can keep spares accessible across multiple tools or work zones without stopping to search for a replacement mid-task

Specifications

• MPN: BIT3SU-2-RC3
• Drive Type: #3 Square, Undersized
• Length: 2 in.
• Quantity: 3

What's Included

• 3 x Simpson Strong-Tie #3 Square, Undersized-Drive 2 in. Power Bits

Frequently Asked Questions

What does "undersized" mean, and why does it matter?

The "U" designation in the model number indicates an undersized bit. Undersized bits are specifically designed for use with coated fasteners, where the coating adds slight thickness to the fastener drive recess. Using an undersized bit ensures a proper, secure engagement with coated fasteners.

Are these bits compatible with all fasteners or only Simpson Strong-Tie fasteners?

These industrial-grade driver bits are specially designed for a secure fit with Simpson Strong-Tie fasteners. Their precision sizing is intended to work optimally with Simpson Strong-Tie coated fasteners that require a #3 Square, Undersized drive.

Why choose Simpson Strong-Tie driver bits over standard bits?

Simpson Strong-Tie industrial-grade driver bits are engineered to outperform substandard bits commonly prone to cam-out and stripping. Their design provides a secure fit that maintains consistent driving performance even under demanding conditions.

How many bits are included in this package?

This package includes 3 Simpson Strong-Tie #3 Square, Undersized-Drive 2 in. Power Bits, giving you backup bits ready for continuous jobsite use.

Note: Undersized bits are designed for use with coated fasteners.