Getting Hard To Reach Nuts And Bolts

How To Install A Bolt In A Tight Spot

Features Star Drive six point head Tiny head is less noticeable on the surface of the wood Offers a very clean finished look Sharp point bites into wood for fast starts Serrated thread acts like a saw blade to cut through the material Stainless steel for ultimate corrosion resistance Why Stainless Steel? Stainless steel is a softer metal than carbon steel and it will flex to some extent, however this is advantageous, particularly when installing hardwood decking.

Concrete screws are commonly blue in color, with or without corrosion coating. Nominal thread sizes range from 0. Typically an installer uses a hammer drill to make a pilot hole for each concrete screw and a powered impact driver to drive the screw.

Most deck screws have a type auger type thread cutting tip for installation into decking materials. They have bugle heads that allows the screw to depress the wood surface without breaking it. A hanger bolt has wood screw threads on one end and machine threads on the other.

A hanger bolt is used when it is necessary to fasten a metal part to a wood surface. Smooth round or mushroom headed with a multi-start thread on the shank, beneath which is reduced diameter shank that acts as a pilot. The screw is fastened by hitting the head with a hammer and is not intended for removal.

The diameter of drywall screw threads is larger than the grip diameter. Larger ones are sometimes called lag eye screws. Designed to be used as attachment point, particularly for something that is hung from it. A vine eye in the UK at least is similar to a screw eye, except that it has a proportionally longer shank and smaller looped head.

As the term suggests vine eyes are often used for attaching wire lines across the surface of buildings so that climbing plants can attach themselves. Lag bolts are designed for securely fastening heavy timbers post and beams , timber railway trestles and bridges to one another, or to fasten wood to masonry or concrete.

Lag bolts are usually used with an expanding insert called a lag in masonry or concrete walls, the lag manufactured with a hard metal jacket that bites into the sides of the drilled hole, and the inner metal in the lag being a softer alloy of lead, or zinc alloyed with soft iron.

The coarse thread of a lag bolt and lag mesh and deform slightly making a secure near water tight anti-corroding mechanically strong fastening.

It is usually used to mount a mirror. They are sometimes notched at the tip to aid in chip removal during thread cutting. The shank is usually threaded up to the head. Sheet metal screws make excellent fasteners for attaching metal hardware to wood because the fully threaded shank provides good retention in wood. Twinfast screw A Twinfast screw is a type of screw with two threads i.

Wood screws are commonly available with flat, pan or oval-heads. A wood screw generally has a partially unthreaded shank below the head.

The unthreaded portion of the shank is designed to slide through the top board closest to the screw head so that it can be pulled tight to the board to which it is being attached.

Inch-sized wood screws in the U. The head of this type of screw is impossible to reverse. It requires special tools or mechanisms like spanners , tri-wings, torxes , square drivers, etc. In some screws, the head can be removed by breaking it after installing the screw.

Fasteners with a non-tapered shank American name Description anchor bolt A special type of bolt that is set in wet concrete, with the screw threads protruding above the concrete surface. Typically used to fasten fire hydrants, so they will break away when hit by a car. Also used in aircraft to reduce weight. Narrow definition Wide definition cap screw The term cap screw refers to many different things at different times and places.

Currently, it most narrowly refers to a style of head see the gallery below. More broadly, and more commonly, it refers to the group of screws: In , Anthony defined it as screw with a hex head that was thicker than a bolt head, but the distance across the flats was less than a bolt's. The term socket head capscrew typically refers to a type of threaded fastener whose head diameter is nominally 1.

Forged heat-treated alloy examples are high strength fasteners intended for the most demanding mechanical applications, with special alloy formulations available that are capable of maintaining strength at temperatures in excess of degrees F degrees C. In addition to the series design, other head designs include low head, button head and flat head, the latter designed to be seated into countersunk holes.

A hex key sometimes referred to as an Allen wrench or Allen key or hex driver is required to tighten or loosen a socket screw. Socket head capscrews are commonly used in assemblies that do not provide sufficient clearance for a conventional wrench or socket. The square section grips into the part being fixed typically wood , preventing the bolt from turning when the nut is tightened.

Carriage bolts are used to provide a smooth finish on automobile metal bumper exteriors, the square section aligning with a square hole in the bumper to provide anti-rotation. A rib neck carriage bolt has several longitudinal ribs instead of the square section, to grip into a metal part being fixed. There are many variations. These screws are most frequently used in applications where the screw is used to control fine motion of an object.

Machine screws are also made with socket heads see above , in which case they may be referred to as socket head machine screws. Plow bolts in use plow bolt plough bolt A plow bolt is bolt similar to a carriage bolt, except the head is flat or concave, and the underside of the head is a cone designed to fit in a countersunk recess.

Plow bolts provide a smooth surface for attaching a plow moldboard to its beam, where a raised head would suffer from soil abrasion. There are many variations, with some not using a square base, but rather a key, a locking slot, or other means.

The recess in the mating part must be designed to accept the particular plow bolt. The necessary dimensions for the head styles can be found in the standard. Designed for use in soft steel or other metals. The points are numbered from 1 through 5, the larger the number, the thicker metal it can go through without a pilot hole.

A 5-point can drill a 0. The advantage of this screw type over a self-drilling screw is that, if the screw is reinstalled, new threads are not cut as the screw is driven. The set screw is driven through a threaded hole in the rotating part until it is tight against the shaft. The most often used type is the socket set screw, which is tightened or loosened with a hex key.

Shoulder screw specifications call out the shoulder diameter, shoulder length, and threaded diameter; the threaded length is fixed, based on the threaded diameter, and usually quite short.

Shoulder screws can be manufactured in many materials such as alloy heat-treated steel for maximum strength and wear resistance and stainless steel for its corrosion-resistance and non-magnetic properties.

Common applications for shoulder screws include rotating mechanism joints , linkage pivots , and guides for the stripper plate of a metal forming die set. In the latter application, the term stripper bolt is often substituted.

Stainless steel shoulder screws are used with linear motion devices such as bearings, as guides and as pivots in electronic and other critical mechanical applications. They are usually made of low grade steel, have a slot or Phillips drive, and are used to join sheet metal parts using a hex or square nut. The head is usually domed and is not designed to be driven. The end of the shank has a spline on it which is engaged by a special power wrench which prevents the bolt from turning while the nut is tightened.

When the appropriate torque is reached the spline shears off. They form threads in a pre-existing hole in the mating workpiece by pushing the material outward during installation.

In some cases the properly prepared hole in sheetmetal uses an extruded hole. The extrusion forms a lead-in and extra thread length for improved retention. Thread rolling screws are often used where loose chips formed by a thread cutting operation cannot be tolerated. Other threaded fasteners A superbolt, or multi-jackbolt tensioner is an alternative type of fastener that retrofits or replaces existing nuts, bolts, or studs.

Tension in the bolt is developed by torquing individual jackbolts, which are threaded through the body of the nut and push against a hardened washer. Because of this, the amount of torque required to achieve a given preload is reduced.

Installation and removal of any size tensioner is achieved with hand tools, which can be advantageous when dealing with large diameter bolting applications. Like aerospace and nuclear power, this field involves some of the highest technology for fasteners, as well as some of the highest prices, for the simple reason that performance, longevity, and quality have to be excellent in such applications.

Bone screws tend to be made of stainless steel or titanium, and they often have high-end features such as conical threads, multistart threads, cannulation hollow core , and proprietary screw drive types some not seen outside of these applications. List of abbreviations for types of screws This section does not cite any sources.

Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. November Learn how and when to remove this template message These abbreviations have jargon currency among fastener specialists who, working with many screw types all day long, have need to abbreviate repetitive mentions.

The smaller basic ones can be built up into the longer ones; for example, if you know that "FH" means "flat head", then you may be able to parse the rest of a longer abbreviation containing "FH". These abbreviations are not universally standardized across corporations; each corporation can coin their own.

The more obscure ones may not be listed here. The extra spacing between linked terms below helps the reader to see the correct parsing at a glance.

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