A nut is a type of hardware fastener with a threaded hole. Nuts are almost always used opposite a mating bolt to fasten a stack of parts together. The two partners are kept together by a combination of their threads’ friction, a slight stretch of the bolt, and compression of the parts. In applications where vibration or rotation may work a nut loose, various locking mechanisms may be employed: Adhesives, safety pins or lockwire, nylon anchor, or slightly oval-shaped threads. The most common shape is hexagonal, for similar reasons as the bolt head - 6 sides give a good granularity of angles for a tool to approach from, but more corners would be vulnerable to being rounded off. Other specialized shapes exist for certain needs, such as wing nut for finger adjustment and captive nuts for inaccessible areas.

Nuts are graded with strength ratings compatible with their respective bolts; for example, an ISO property class 10 nut will be able to support the bolt proof strength load of an ISO property class 10.9 bolt without stripping. Likewise, an SAE class 5 nut can support the proof load of an SAE class 5 bolt, and so on.

Tags:Self Tapping Screw Self Drilling Screw Stainless Steel Fastener

Metal roofing should not be hand-installed, because it demands that roofing screws be separated by no more than two feet. Driving this number of roofing screws by hand would quickly exhaust the hand and arm strength of the roofing crew, and relying on the rechargeable roofing screw guns now available would mean to switch to fresh batteries at hourly intervals. Because most rechargeable roofing screw gun batteries require a charging time of one hours, each roofing crew member would need four batteries to complete an eight hour shift!

One solution would be to use an electrically powered roofing screw gun which can operate without interruption for an entire day. Most of these screw guns are manufactured with adjustable power levels, enabling their users to select just the right amount of force to use when installing the roofing concrete screw.

Roofing screws which are driven too deeply into a roof can either damage the roof itself or have their heaps snapped off, making them very difficult to remove. The disadvantage of using an electrically powered roofing screw gun is that it rewires the use of a long extension cord, which can be a hazard for those working on the rooftop.

The third alternative for installing roofing screws is the pneumatic screw gun, which is powered by an air compressor. The pneumatic patio roofing screw gun is attached to its air compressor by a long air hose, which like the extension cord on an electrical screw gun can be a real encumbrance when it is dragged around on the roof.

Special tools are used that can measure the degrees a wrench or bolt has been turned, these are low cost protractors that has a movable pointer, whilst some tools use electronics when measuring a turning angle these can cost several hundred dollars. These two types both work well and though the electronic one is more expensive it actually can make the job go faster.

Some may ask the question why are the torque to yield bolts needed now? When perhaps they weren’t needed in the 1960’s or 70’s. The answer to that question is quite simple in that engine materials are different now. For example, the aluminum cylinder heads expand differently to cast iron blocks. When an engine warms up, all the parts bolted together have to be able to slide on their gaskets or move against each other. Because of the elasticity in the torque to yield bolts allows movement between the parts but still maintains even sealing and clamping loads.

Engine parts today are a lot lighter than decades ago, the heavy cast iron parts was able to take variations in torque without failing. Aluminum alloys and thin wall castings that are used today need accurate torque if this is incorrect then leaks or warping can occur.

Today the design of engines is changing due to the need of even clamping forces, the car manufacturer Ford have prototype engines where bolts which hold the cylinder head on can go all through the engine block threading into the bottom casting which holds the crankshaft. It’s hard to imagine that only a few bolts can hold a complete engine together. This would definitely change the way engines where assembled and disassembled in the future.
Nylon Anchor Self Tapping Screw Self Drilling Screw Stainless Steel Fastener

Time and technology has changed the way many cars are put together these days, there have been many new introductions for example like plastic clips, adhesive and Velcro, replacing trim nails and Concrete Screw that normally held panels together in the past. There is still the use of bolts when assembling mechanical components, but even some of these has changed. Today, on major assemblies, torque to yield bolts are used in engines.

These bolts stretch to the yield point when tightened; the bolts are often used when exact clamping loads are needed on parts, they can be used on connecting rods, crankshaft main bearing caps, cylinder heads, front engine dampers and even flywheels. Torque to yield bolts will no doubt be used if the shop manual indicates a bolt needs to be discarded and replaced with a new one.

This can become expensive and a total waste of time if you have to buy new bolts all the time. Too many these old bolts may still look usable but beware looks can deceive, if using old bolts it may cause engine failure an expense nobody wants. Through the process of tightening bolts it pulls them to their elastic limit due to stretching, that’s why new ones are needed to give maximum force on today’s engines.

It is easy to understand if you tighten a bolt to much then the harder it is for it to become accurate on a clamping load. Friction occurs when tightening bolts these are like a ramp, when turning this has to slide against another thread or ramp in the bolthole. The tighter it goes the harder it becomes to move or push up the threads ramp.

When stationary the term used is stiction as against friction, as the bolt becomes tighter it is the station that will affect a torque reading. People may use lubrication to help threads slide easier but the quality between one lubricant and another can vary. It is far easier to follow manufacturer’s guidelines for the best type of lubricant that is needed for the bolt when tightening. This is important because if you use the wrong lubricant it may become too tight or not tight enough.

There are several stages to follow when tightening torque to yield bolts this is done using both a torque and turning angle. The first step is to tighten the bolt to a low torque specification, this is done to ensure even clamping load is in place when parts are assembled. The second stage is to tighten again slightly to the higher torque stage. This will still allow enough friction and stiction on the bolt threads as the torque is tightened very little. The normal procedure after this is too turn each bolt a specified number of degrees normally two to three steps. As an example, the bolt might be turned 90 degrees, and then another 90 degrees until a further 70 degrees has tightened the bolt sufficiently. This will ensure the clamping force that has been exerted by the bolts is both accurate and even.

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Hammer-type Anchor - Fixture will be non-removable

The hammer drive and nylon nail-it anchors are two fasteners that fall into the hammer type category. Neither of these anchors results in a stud protruding from the wall. Both of these anchors are basically non-removable. They are simple to use but should only be used in light duty applications because the only diameter available is 1/4″. The hammer drive anchor is produced with a low profile, mushroom head while the nylon nail-it anchor is available in three head styles - mushroom, round and flat countersunk.

Female-type Anchor - Fixture will be removable

There are a number of different female type anchors. The anchor chosen will depend on the type of bolt being inserted into the anchor as well as the quality of the base material. The sizes of these anchors are designated by the inside diameter of the anchor, which is the size of the bolt that will be inserted into it. The different female type anchors and their unique characteristics are listed below:

The machine screw anchor requires a machine threaded bolt with national coarse threads. For example, 1/4″-20 machine screws require a 1/4″ bolt with 20 threads per inch. This anchor also needs to be set in the base material using an appropriately sized setting tool. The 1/4″ and 5/16″ machine screw anchors should be considered for light duty applications and the 3/8″ and 1/2″ for medium duty. The 5/8″ and 3/4″ diameter machine screws are typically reserved for heavy duty use.

Lag shield anchors require the use of a lag screw. Lag shield anchors are available in short and long lengths. The length of the lag shield is generally determined by the quality of the base material. The long lag shield is usually used when the quality of the base material is suspect. The extra length of the long lag shield increases its ability to perform properly. The 1/4″ and 5/16″ lag shield anchors can be used in light duty applications, the 3/8″ and 1/2″ for medium duty and 5/8″ and 3/4″ for heavy duty.

The single expansion anchor and double expansion anchor require the use of a machine threaded fastener with national coarse threading. Both anchors work well in most base materials. The double expansion anchor should be used in applications with questionable base material quality. Both the single and double expansion anchors come in a variety of diameters to allow for usage in many different applications. The 1/4″ and 5/16″ should be used for light duty type loads, the 3/8″ and 1/2″ for medium loads and the 5/8″ and 3/4″ for heavier loading applications.

Leadwood screw anchors were originally made from lead. These concrete anchors are now produced from a material called Zamac - a softer, non-corrosive metal. This fastener is used in light duty applications since it is only available up to 5/16″ in diameter. The leadwood screw anchor requires the use of a sheet metal screw. Like sheet metal screws, these anchors are also designated by the gauge wire used to produce the screw - #6, #8 and so on. Different lengths are available in each diameter and can be used in applications with many embedment requirements.

Concrete Screw- Fixture will be removable

The concrete screw is designed to tap threads into base materials made of concrete, brick or block. They work well in mortar joints as well as in the solid and hollow sections of a block for light duty loads. They are availabe in a wide array of lengths in both 3/16″ and 1/4″ diameters. Two different head styles are available - hex head and flat philips for countersinking.

All of the fasteners described above are suitable for use in concrete block- whether it be the solid section of the block, the hollow section or the mortar joint. These fasteners may be used in light or medium load applications with a non vibratory, non-shock load.

Although some of the fasteners listed above may be appropriate for heavy duty loads, it is not recommended to fasten a heavy load to concrete block. The strength and integrity of the block will be limiting and will most likely fail with a load that is too heavy. Heavy duty, non-vibratory, non-shock loads would require a through-bolted fastening technique or a concrete epoxy type fastener. Vibratory and shock loads would also require a through-bolted fastening system, a concrete epoxy type anchor or a cast-in place fastener. An engineer should always be consulted if your application requires any of these fastening techniques.

Additional Information

Many construction projects and applications will require fastening to concrete block. Before getting started, it is essential to choose the correct type of concrete anchor as well as determine in what part of the block to fasten the load. Taking the time to make the right decisions will ensure safe and effective anchoring. There are anchors available for use in a wide range of applications. Load type will also be a determining factor during the installation of concrete anchors. With the right knowledge, research and a bit of patience, anchoring concrete fasteners to block can be a simple process.

As with any anchoring project, it is important to keep safety in mind and follow instructions carefully. Always remember to wear safety googles, handle all tools with extra care and follow all technical specifications. This article is meant to serve as a basic overview of how to fasten concrete anchors into block. Always refer to the manufacturers’ instructions or consult a contracting expert during any anchoring project.

Tags: Stainless Steel Fastener Self Tapping Screw Self Drilling Screw
In many construction applications, concrete anchors must be fastened to a concrete block to hold a fixture or item of some kind. When installing these concrete anchors, special care must be taken to ensure safe and proper fastening. When fastening to concrete blocks, a number of specific considerations must be taken into account. These include what part of the block to drill into as well as which type of anchor would work the best in the specific application.

What is a concrete block?

A concrete block, cement block, foundation block or concrete masonry unit (CMU), is a large rectangular block used primarily in the construction of walls. Concrete blocks are made from precast concrete, i.e. Portland cement, water and aggregate. The aggregate used for high-density blocks is usually sand and/or fine gravel. Lower density blocks, more commonly known as cinder blocks, may be produced using cinders as aggregrate. These blocks are then layered and stacked vertically to form a wall, and are held together using concrete mortar.

Determine where in the block the anchor should be placed

Before choosing the correct anchor for an application, it is necessary to consider where in the block the fastener should be positioned. Will the fastener be placed in (a) the mortar joint, (b) the solid section of the block, or (c) the hollow section of the concrete block? Some applications may allow each fastener to be placed in the same part of the block while other installations require that each anchor be placed in different sections of the block.

Each section has unique advantages and disadvantages. Fastening into the mortar joint can be an excellent option depending on the quality and quantity of the mortar used to set the block in place. The solid sections of the block usually offer the best quality fastening. This will depend on the distance of the fastener to the unsupported edge of the cavity and the quality of the material from which the block is made. The hollow section of the block is the least desirable section of the block in which to fasten but sometimes can not be avoided. When fastening into the hollow section of a block, there are a few considerations to keep in mind:

(1) When drilling into the block with a hammer drill, the block will spall. This leads to a cone shaped space, with the point of the cone closest to the surface of the block.

(2) When inserting an anchor into this area, whether it’s a fastener that exerts pressure or a concrete screw that taps threads into the base material, the holding values will be diminished or become non-existant.

(3) The fastener must not penetrate the wall into the cavity itself.

Determine the type of load to be fastened

The next step in the process is to ascertain the type of load that is going to be anchored. There are three questions that will help determine the type of load each application produces:

(1) How heavy is the item that is being fastened to the block wall?

(2) Will the load be a vibratory load?

(3) Is the load going to be placed where a shock load could occur?

Determine the type of anchor required

Lastly, the type of fastener required for the application must be determined. There are four options available that can be used in concrete block:

(1) Stud-type anchor: where the stud will stick out from the wall. Example: Sleeve Anchor

(2) Hammer-type anchor: where the stud does not protrude from the wall, for a finished look. Example: Hammer Drive, Nylon Nail-It

(3) Female-type anchor: where a screw is inserted into the anchor for a finished look. Example: Machine Screw Anchor, Lag Shield Anchor, Single Expansion Anchor, Double Expansion Anchor, Leadwood Screw Anchor

(4) Concrete screw: screwed directly into the block for a finished look

If using a stud-type anchor, female type anchor, or the concrete screw- the fixture, or item being fastened, can be removed at any time with little or no damage to the concrete block. However, hammer-type anchors are permanent installations. Removing these fasteners will greatly damage the concrete block and possibly the fixture as well.

Anchor types that can be used in concrete block applications

Stud-Type Anchor - Fixture will be removable

Sleeve anchors come in the widest variety of sizes for applications that fall into this category. Anchors with diameters ranging from 1/4″ to 5/16″ are sufficient for most light duty applications while the 3/8″ and 1/2″ diameters are adequate for most medium duty situations. Sleeve anchors with diameters of 5/8″ and 3/4″ are usually considered heavy duty anchors. An engineer should be consulted every time concrete anchors are used for heavy loads. This anchor is very versatile because there is a wide range of lengths available allowing materials of many different thicknesses to be attached to a block wall. The sleeve anchor also comes in a variety of head styles - hex head, flat countersunk and acorn or round head for aesthetics.

Self Tapping Screws Facts Fabrication for engineering. Non ferrous material. Heat-treating for strength. Wood working products. F instruments airplane pilots rely on a set of instruments in the cockpit to monitor airplane systems, to control the flight of the aircraft, and to navigate. The components are assembled. Attach to device with strength. The giant steel mills remain essential for the production of steel from iron ore. Components assembled with strength. Specialty security parts. The professionals choice in materials. For fast assembly. Hardware for the robotics industry. Adhesive coated gasketing materials. Double-x car pieces. B the first airplane flight american aviators orville wright and wilbur wright of dayton, ohio, are considered the fathers of the first successful piloted heavier-than-air flying machine. See also Fasteners, and pages related to Self Tapping Screw.

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In the southwest, stucco walls are constructed with a concrete beam or footer for a foundation. Then a cinder block wall is built on top of that. The excavation for the footer is labor intensive if heavy equipment can’t be used. The cinder block wall must be built by experienced masons or any flaws will show up in the finished product after the stucco finish is applied.

I propose a different way of doing it using pipe posts, proprietary brackets, standard four inch C purlins, and expanded metal fine enough for use as a lathe screen.

The pipe posts are set in concrete footers. Then the standard four inch purlins are placed using our brackets and standard self tapping tek screws.

The brackets slide over two inch (2 3/8″ O.D.) pipe. The brackets are held in place with a special clip and self tapping screw combination. This is a picture of a straight through bracket being installed to frame a metal building.

There are three basic brackets. The one above for straight runs connecting posts in a straight line.

For the ends and corners we have right and left brackets.

The standard 1 1/2″ X 4″ C purlins fit over the brackets and are attached with self tapping screws.

The expanded metal/lathe material would then be attached to the C purlins with self tapping sheet metal screws. The stucco finish would then be applied per standard practices.

I don’t have any pictures of a completed stucco finish wall. That’s because those kinds of walls aren’t built here where I live in north Texas. Here we have gumbo clay, also known as expansive soil. The ground here moves swimming pools, home foundations, and retaining walls. Fences don’t stand a chance and a stucco finished one would break up in one season without the post holes going into limestone and the fence suspended above the ground.

I originally came up with this product to enable someone unable to weld to build a metal framed building easily. The fence man part of me saw building a metal screen wall with the system could be easily done by a competent do-it-yourselfer or a minimally experienced fence crew. Since I was born and raised in Arizona and then moved to California the stucco fence idea was a natural.

The advantages of the system are many.

First there’s the fudge factor built in with the brackets. The cuts don’t have to be ninety degrees necessarily and they can be up to two inches shorter than the optimal measurement without compromising the integrity of the connections. This is true when framing up a metal building or building a stucco fence with the system.

There are no mitre cuts required. All the cuts made on the purlins can be made with a chop saw, a portable band saw, a Sawsall, or even a cutting torch. All the cuts are ninety degrees more or less, close is good enough because the end and corner brackets move around the post and can be placed at any angle to accomodate change of direction in the fence line.

The footer or concrete for the posts is more critical with the stucco than that required for wood or wire fencing because stucco is concrete and won’t tolerate much movement.

Driving drywall screws by hand is way to tiresome if you have an entire house to do. You can use a drill, but most drywall installation experts recommend using a screw gun, also referred to as a drywall screwdriver. I’ve seen people try using a regular drill with variable speeds to put in drywall screws and more often than not they end up tearing the drywall paper and ruining it. The benefit of using a screw gun is that the tool has a clutch and special collar so that when your screw reaches a certain depth, the driving motion from the gun will stop. Almost all craftsman who install drywall for a living own a screw gun for this reason. Beyond drywall, screwdrivers and screwguns are used for framing and decking with wood or steel. The top brands are Milwaukee, Senco, Makita, DeWalt, Bosch, Hitachi, and Porter Cable. Expect to spend at least $60 for the basic models and upwards of $200 for the collated screwdrivers with autofeed systems.