square head screw name

The square-head screw was invented by P. I. Robertson, a Canadian, in 1908. It offered a big advantage over the slotted screw head because 

The Quadrex screw head is also called a Phillips square drive, in part because it is a combination of a square recess and a Phillips recess. It looks a lot like 

Description:1. Advantage: Square head bolt offers a large bearing area, is made of 304 stainless steel, anti-rust, wear-resistant, corrosion-resistant, and can be used indoors and outdoors.2. Application: It is widely used in the assembly and maintenance of machinery, railroad, electrical connections, construction, some assembly required furniture and DIY project. Such as the assembly and

Square Drive Screws offer markedly more resistance to “Cam-Out” (that disaster waiting to happen whereby the screw driver slips out of the screw slot or 

What is a Robertson Screw or Robertson Head Screw? Most of us call Robertson screws “square drive” or “socket head” screws. They were invented by Canadian traveling salesman Peter Robertson around 1906.

In 1908, square-drive screws were invented by Canadian P. L. Robertson (1879–1951), 28 years before Henry Phillips patented his Phillips head 

Also known as half dog-point set screws, they have a protruding tip that locks within a mating hole or slot to keep parts aligned. Metric Square-Head Extended-Tip Set Screws These metric screws have a square head, so you can turn them by hand or use a wrench for more torque.

Square Head Bolts are similar to Hex Cap screws but have a 4-sided square head instead of a 6-sided hexagonal head. They are commonly referred to as 

Kreg 1 in. Internal Square Coarse Zinc-Plated Steel Square-Head Square Pocket Hole Screws (100-Pack) Model# SPS-C1-100 (101) $ 6 97. Project Guide. How to Remove a Stripped Screw. Learn how to remove a stripped screw . Read Our Guide. Buying Guide. Types of Outdoor Nails and Screws. See Our Tips. Related Searches. 3 deck screws

That's a countersunk head bolt. Not even a screw ;).

Until the square drive screw was invented, nearly all screws were slot head or straight drive screws. Square drives, also known as Robertson