Impact sockets

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The Armstrong Bros. Tool Company began in 1890 as a maker of bicycle parts and service tools, founded in Chicago, Illinois by four brothers. Their first manufacturing operations were conducted literally from a backyard wooden shed, and the brothers also operated a retail store for their bicycle parts.

In 1895 Armstrong introduced what would become their first major product, a tool holder for lathe cutting bits. Developed from their own manufacturing operations, the Armstrong tool holder was a forged handle that accepted small interchangeable cutting bits, thereby replacing the individually forged cutting tools previously required. This dramatically reduced the time and expense involved in making lathe cutting tools, and it’s fair to say that these tool holders revolutionized the industry.

With the success of the tool holder, in 1900 Armstrong built their first real factory at 617 Austin Avenue in Chicago. This was replaced a few years later in 1905 by a 100,000 square foot brick factory at 317 North Francisco Avenue, a site they would occupy for many years.

Up until 1909 Armstrong concentrated primarily on tool holders and related products, but in 1909 they started producing a line of drop-forged wrenches. This line of tools continued to expand over the years.

By 1920 Armstrong was offering three sizes of “Aero” tappet wrenches made of chrome-nickel steel, an early example of alloy steel usage for tools. The notice at the left, published on page 748 of the November, 1920 issue of Railway Mechanical Engineer, announces Armstrong catalog B-20 and notes the inclusion of “Aero” tappets among the new products.

In 1948 the company moved from the Francisco Avenue site to 5200 West Armstrong Avenue, where they remain today. A second manufacturing facility in Fayetteville, Arkansas was added in 1974.

In 1994 Armstrong was acquired by the Danaher Group, a conglomerate with other tool company holdings including Allen, K-D, Matco, and Moore Drop Forging. Armstrong operates now as the Industrial Hand Tools division of Danaher.

APEX Tool Group will cease production of its Armstrong and Allen lines of hand tools, ending employment for 170 workers at its Sumter plant. The Armstrong lines of hand tools will end by March 31

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Proto® 3/8″ Drive Air Impact Wrench


Features and benefits

Features and benefits
• Titanium housing helps to reduce weight, improve balance and ensure maximum durability.
• Ergonomically designed handle-forward design improves balance and control, helping to reduce operator fatigue.
• Robust twin hammer mechanism for efficient energy transfer and long service life.
• Ambidextrous forward/reverse lever can be actuated with a single hand, even with gloves on.
• Three position power regulator for forward rotation. Reverse rotation operates at maximum for highest breakaway torque.
• Feather throttle for maximum operator control.
• Side-fed, 6-vane air motor for maximum power and efficiency.
• Machined motor housing reduces number of parts, creating precision alignment, reducing wear, increasing efficiency and simplifying maintenance.
• 360º Rotating Air Inlet Fitting.
• Titanium Exhaust Deflector and Muffler.
• Integrated Tethering Capability in all Proto® Air Tools.
• Optional ProtoID™Air Fitting for RFID Tracking Capability. Visit for more information.

Impact Socket 1/2" 3/4"

Impact Socket 1/2″ 3/4″

Impact sockets that help you get the job done right, safely.

Real pros don’t have time to worry about stripped fastener heads or cracked sockets. That’s why our sockets are constructed from a special alloy steel that’s been heat treated for strength and hardness. Proto®, Blackhawk™ by Proto®, and Expert impact sockets save you time and hassle because you know you can trust them to perform right every time, no matter what job you’re doing.

We offer a range of finishes and wall thickness options for different environments, tasks, and levels of impact.