Simpson #2 Square Undersized-Drive 2 in. Power Bit is an industrial-grade driver bit from Simpson engineered for a secure, reliable fit with Simpson Strong-Tie fasteners. The undersized drive design - indicated by the "U" in the model number - makes this bit specifically suited for coated fasteners, where the added coating thickness demands a properly fitted bit. Available in a 3-pack, these square-drive bits are built to outperform substandard options commonly prone to cam-out and stripping, keeping your fastening work on track.

Key Features

• Undersized drive design - engineered specifically for coated fasteners, accounting for the extra thickness of the coating so the bit seats properly and drives cleanly without slipping
• #2 Square, Undersized drive type - matches square-drive fasteners from Simpson Strong-Tie for a secure, wobble-free engagement that reduces the risk of cam-out and fastener head damage
• Industrial-grade construction - built to outperform substandard bits that strip or cam out prematurely, delivering consistent performance through demanding fastening applications
• 2 in. length - a practical working length that fits standard power drills and impact drivers, giving you good bit-to-fastener control in typical framing and construction tasks
• 3-pack quantity - keeps spare bits on hand so work does not stop when a bit reaches the end of its service life on the job

Why This Product

• Purpose-built for coated fasteners - the undersized drive geometry is specifically sized to fit fastener heads that carry a protective coating, preventing the sloppy fit that leads to cam-out when using standard-size bits on coated screws
• Designed as a matched system with Simpson Strong-Tie fasteners - engineered by the same manufacturer as the fasteners themselves, these square-drive bits are optimized to work together, reducing wear on both the bit and the fastener head
• Industrial-grade durability over budget alternatives - Simpson's own marketing data identifies cam-out and stripping as common failure points of substandard bits, and these bits are constructed to resist exactly those failure modes during heavy-use fastening work
• Multiple drive configurations available within the Simpson lineup - Simpson offers these bits in square, 6-lobe, and hex-drive configurations, making it straightforward to match the right bit to the right fastener across different project requirements

Specifications

• MPN: BIT2SU-2-RC3
• Drive Type: #2 Square, Undersized
• Length: 2 in.
• Quantity: 3

What's Included

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

Frequently Asked Questions

What does "undersized" mean in the model number of this bit?

The "U" designation in the model number indicates an undersized bit. Undersized bits are specifically designed for use with coated fasteners, ensuring a proper fit that accounts for the additional thickness of the coating on the fastener head.

What drive configuration does this power bit use?

This bit features a #2 Square, Undersized drive type, which is designed to work with corresponding square-drive fasteners from Simpson Strong-Tie.

How long is each power bit in this pack?

Each power bit in this pack measures 2 in. in length.

How many bits are included in this package?

This package includes a quantity of 3 power bits, giving you spares on hand for extended use on the job.

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