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The internal-drive square socket for screws (as well as the corresponding triangular socket drive) had been conceived several decades before the invention of the Robertson screw and driver. An earlier patent covering both square-socket- and triangle-socket -drive wood screws, U.S. patent 161,390 , was issued to Allan Cummings of New York City ...
Most industries use screw piling experts due to the cost efficiencies and, increasingly, the reduced environmental impact. "Screwing" the foundations into the ground means that there is less soil displacement so excess soil does not need to be transported from the site, saving on transportation costs and reducing the carbon footprint of the ...
Spotsylvania County is a county in the Commonwealth of Virginia. It is a distant suburb approximately 60 miles (90km) south of D.C. It is a part of the Northern Virginia region and the D.C. area. As of 2024, Spotsylvania County is the 14th most populated county in Virginia with 149,588 residents. [7] Its county seat is Spotsylvania Courthouse. [8]
State Route 2 (SR 2), formerly State Route 50 (SR 50), is a primary state highway in the U.S. state of Virginia. The state highway runs 53.08 miles (85.42 km) from U.S. Route 1 (US 1) and US 301 in Richmond north to US 1 Business , US 17 Business , and SR 3 Business in Fredericksburg .
Tapcon screws are a popular anchor that stands for self tapping (self threading) concrete screw. Larger diameter screws are referred to as LDT's. This type of fastener requires a pre-drilled hole—using a Tapcon drillbit—and are then screwed into the hole using a standard hex or phillips bit. These screws are often blue, white, or stainless ...
A county highway (also county road or county route; usually abbreviated CH or CR) is a road in the United States and in the Canadian province of Ontario that is designated and/or maintained by the county highway department. Route numbering can be determined by each county alone, by mutual agreement among counties, or by a statewide pattern.
The screw itself should be drilled a minimum of 1" into the concrete to hold effectively and a maximum of 1-3/4" or the threads will wear and will lose holding power. Ideally 1-1/4" to 1-1/2" of screw thread in the concrete. [1] So for example, if a 1/2" board is being screwed onto the concrete, a 1-3/4" to 2" concrete screw should be used ...
Isometric projection of a grub screw with a hex socket head. Set screws are not always the best way to resist the torque of driven shafts. To reduce the chance of slipping and to increase load capacity, a detent (often called a "flat") may be milled or ground at the part of the shaft where the set screw's point contacts. The detent, however ...
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