The Simpson 1/2 inch Dome Washer with 1 inch Pin is a gas-actuated fastener from Simpson designed to securely attach building components to concrete substrates. Pairing a 1/2 inch dome washer with a 0.125 inch diameter, 1 inch pin, this fastener is built for demanding construction environments where reliable holding strength and tool compatibility are critical. Its zinc-plated carbon steel construction makes it well suited for high-volume fastening work across a range of substrate conditions.

Key Features

• Gas-actuated design compatible with common powder-actuated tools - allows contractors to drive fasteners efficiently into harder substrates such as structural steel and extra-hard concrete, reducing downtime on the job.
• 1/2 inch dome washer head - distributes load across the fastened surface for a more secure, stable connection when attaching building components to concrete.
• Carbon steel construction with zinc finish - provides corrosion resistance and the durability needed to hold up in demanding construction environments.
• Approved for use in structural steel and extra-hard concrete - expands the range of substrates this pin can be used in, giving crews greater flexibility across varying site conditions.

Why This Product

• Built for high-volume work - the gas-actuated pin format is designed specifically for applications where speed and consistency matter, making it a practical choice for crews driving large quantities of fasteners into concrete or steel.
• Versatile substrate compatibility - approved for standard concrete, structural steel, and extra-hard concrete, this dome washer pin reduces the need to source multiple fastener types for a single project.
• Trusted Simpson engineering - manufactured by Simpson, a widely recognized name in structural fastening, this pin is purpose-built to perform in the approved applications for which it is rated.
• Zinc finish for added protection - the zinc-plated carbon steel construction helps resist corrosion, supporting long-term performance in the tough conditions common to construction fastening work.

Specifications

• Manufacturer Part Number (MPN): GW100-R100
• Manufacturer: Simpson Strong-Tie
• Material: Carbon Steel
• Finish: Zinc
• Pin Diameter: 0.125"
• Head (Washer) Diameter: 0.300"
• Pin Length: 1"
• Quantity per Pack: 100

Approved Applications

• Fastening building components to concrete substrates
• High-volume construction fastening applications
• Fastening into structural steel using powder-actuated tools
• Fastening into extra-hard concrete using powder-actuated tools

What's Included

• 100 x Simpson Strong-Tie GW100-R100 1/2" Dome Washer Pins with 1" Pin

Note: Product dimensions and/or thread length may differ from picture. Please see the item description above for specifications.

Frequently Asked Questions

What type of tool is required to drive the GW100-R100?

The GW100-R100 is a gas-actuated pin designed for use with common powder-actuated tools. It is compatible with tools suited for driving fasteners into harder substrates, including structural steel and extra-hard concrete.

What are the key dimensions of this pin?

The GW100-R100 features a 1" pin length with a pin diameter of 0.125" and a head (washer) diameter of 0.300". The dome washer measures 1/2" in size.

What substrates is the GW100-R100 approved for use with?

This fastener is designed for fastening building components to concrete substrates and is also approved for use in structural steel and extra-hard concrete when used with compatible powder-actuated tools. It is well suited for high-volume construction fastening applications.

What material and finish does the GW100-R100 have, and how many come in a pack?

The GW100-R100 is constructed from carbon steel with a zinc finish, which provides enhanced corrosion protection in demanding construction environments. Each pack contains 100 fasteners.