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What Is Pozidriv? How Does It Differ From A Phillips Drive?

What Is Pozidriv?Pozidriv bit and Pozidriv screw

Pozidriv, commonly spelled incorrectly as “Pozidrive”, is an improved variation on the Phillips drive design. After the patent for the Phillips head expired, the company GKN Screws and Fasteners created the Pozidriv design.

The Pozidriv drive style was originally formed to address the largest issue Phillips heads are prone to: cam-out. Cam-out is defined as the slipping out of a drive recess that occurs when torque exceeds a certain limit. The Pozidriv drive style has the same self-centering design of a Phillips drive style but improves upon the two following factors:

  • Increased torque without cam-out
  • Greater surface contact engagement between the drive and the recess in the fastener head making it harder to slip when installed correctly

Can I Use a Pozidriv on a Phillips Screw? Or Vice-Versa?

While we at Albany County Fasteners do NOT recommend using the improper drive style on a screw, technically speaking you can. A Phillips drive style fits into a Pozidriv drive recess decently when using the right size. It’s important to note that even if the Phillips does fit snugly into the drive recess, it is still much more likely to strip or cam-out than when using the proper driver.

Alternatively, you can attempt to remove a Phillips screw with a Pozidriv drive but they do not fit into the Phillips drive recess snugly and are much more likely to slip or damage the recess during removal.

Where Are Pozidriv Screws Used?

Pozidriv screws can be used just about anywhere, although they are not nearly as popular as standard Phillips screws. Over the years, many other drive styles, such as the Torx and Robertson, have come out as being more reliable than the Phillips drive style at preventing cam-out and stripping. The Phillips drive is still extremely popular in manufacturing due to its self-centering design but is starting to lose popularity for manual applications due to other drive styles having a better design.

Benefits of the Pozidriv Drive Style

As an improvement on the Phillips drive style, the main benefit of using the Pozidrive is the increased torque without the increased risk of cam-out. Pozidriv screws can handle significantly more torque on the fastener recess than a Phillips drive can.

How Do You Identify A Pozidriv Screw?

While Phillips and Pozidriv screws look similar, Pozidriv are actually quite easy to recognize at a glance. This is due to four notches marked into the head of the Pozidriv screw that are not present in the Phillips Head Screw.

Phillips Pozidriv
Phillips Drive Recess Profile Pozidriv Drive Recess Profile



Pozidriv Screwdrivers

The Pozidriv drive style can be found in a range of sizes from 0-5. The letters PZ or PSD are usually listed before the size number (e.g. PZ3 or PSD5). ANSI standards refer to Pozidriv as a “Type IA”. The Pozidriv style can be found in two forms. Either as a Pozidriv screwdriver or as a Pozidriv screwdriver bit. We currently carry Pozidriv driver bits in several different sizes in the following Vega Bit Kits:

Pozidriv vs.

Phillips

The Pozidriv is an improvement on the Phillips drive by increasing its torque capacity without increasing the likelihood of cam-out. It also has greater surface area contact with the drive recess. This makes it less likely to strip when installed correctly. In general, you can determine if a Pozidriv screw should be used over a Phillips screw by asking the question “How much torque do I need for this installation?” If the answer is a minimal amount of torque, the Phillips drive will work, otherwise, use the Pozidriv. As an improvement on the original Phillips style, the Pozidriv style is better than the Phillips.

Torx

The Torx, or Star, drive style vastly changes the design of the drive recess. Due to the star having six points of contact (6-Lobe), the screw uses a truly radial force rather than an axial force. Phillips and Pozidriv screws use an axial force to drive the screw which is not as effective and is more likely to cause cam-out. For manual applications, Torx screws are quickly becoming the most popular choice.

ROBERTSON

The Robertson, or square, drive is quite common especially throughout Europe. The square drive offers a unique style as it must fit perfectly into the drive recess to drive properly. When it comes to Robertson vs. Pozidriv styles for manual applications, the Robertson is the winner. However, the square drive is not nearly as popular as the star drive style.

Conclusionpozidriv screw and pozidriv insert bit from Vega set

While the Pozidriv drive style is an improvement upon the Phillips drive style, the Phillips is still incredibly popular and does not seem to be going anywhere any time soon.

Should you be in the manufacturing field and find you are having trouble with cam-out, you may want to attempt a Pozidriv configuration. It will give you the added benefits of a reduced cam-out with a better fit into the drive recess while preserving the self-centering functionality that is a must for manufacturing. For manual applications however, both the Star and Square drives are better choices to better suit your needs.



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Flame Resistant vs Flame Retardant – What’s Better?

Flame Resistant vs Flame Retardant

Anyone that has ever been burnt will tell you to respect heat. Burns are one of the worst types of injuries. They don’t heal quickly, can be incredibly painful and in some cases, it can be a chore to keep the wound clean while it heals.

Often with burns, first comes fire. Fire can be incredibly dangerous in the right circumstances and because of this. Many companies now have stringent rules and regulations in place to limit risks.

While fires at work may not seem to be a problem you think will affect you, burn related injuries can be around any corner, especially in the Oil and Gas industries, Iron Working, Welding and more. In fact, the American Burn Association reported that approximately 486,000 people received medical treatment for burns in 2016.

Now the basics of putting out a fire (especially once you are on fire) should have already been covered when you were in elementary school. Stop, Drop and Roll are great recommendations for things to do once you’re already on fire but is there a way we can avoid it all-together?

As it turns out, there is. One of the most common ways to avoid burns is to stay away from hot things. Well that really isn’t an option for certain professions, so flame resistant and flame-retardant clothing rules became standardized for those industries. But what are they? What’s the difference? And how do they work? Is Fire Resistant better than Fire Retardant? Or Vice Versa? Let’s take a look.

flame resistant vs flame retardant break image



Flame Retardant

flame retardant chemicals

Fire retardant clothing are composed of just about any material. That sounds odd but fire retardant anything is actually just an item coated in a chemical spray designed to limit a fire’s impact on the object.

Fire retardant chemicals are not as popular as they used to be due to some of them having toxic chemicals. Fire retardant chemicals are commonly used on plastics and furniture to help reduce the chance of fire spreading. Flame Resistant Chemicals have evolved to also provide other features such as stain guarding.

Flame Retardant Sprays Worth Trying:

*Fire retardants may wash out on clothing. Always check the manufacturer recommendations for instructions applying, maintaining or removing the chemicals.

Flame Resistantflame retardant clothing / safety gear

Flame resistant clothing is made from fabrics that are inherently resistant to catching on fire. This means the flame-resistant material naturally deters fire. Unfortunately, many clothing lines have mixed materials, so you need to be careful when buying.

Flame resistant materials, while they can catch fire if exposed directly to a flame, are not likely to catch fire just from being near the fire. Also, should a fire-resistant material catch fire, the fire will have a hard time staying lit. Many of these materials will choke the fire, causing it to extinguish.

Listed Below Are Several Flame Resistant Materials:

  • Coated Nylon
  • Carbon Foam
  • Wool
  • Leather
  • Gypsum Boards
  • Concrete
  • Cement
  • Glass



Flame Retardant and Resistant Clothing

Flame retardant and flame-resistant clothing play an important role in many industries. From Oil and Gas all the way to the furniture manufacturing, fire retardant and resistant fabrics are a critical factor for engineers.

This is no exception when it comes to safety gear. Fire resistant/retardant safety vests, shirts and gloves are all examples of gear that has been designed or treated to provide users with an extra layer of protection from flame. Flame retardant/resistant clothing can be very safe but is not meant to be exposed to heat for a long amount of time.

Flame Resistant vs Flame Retardant – Who Wins

While both flame resistant and flame-retardant methods both have their place in safety apparel and other industries, flame resistance is probably considered much safer than flame retardant alternatives. There have been many discussions about the toxic chemicals that can be found in flame retardants and their negative impact on our health, and even ecosystem.

The best solution to fire is to be careful to avoid it whenever possible in unsafe environments. In fact, even when in a safe environment, fires are dangerous and should always be closely monitored. Flame resistant and flame-retardant clothing, are only meant to keep you safe and prevent injury until you can move to a safe location, it doesn’t mean that you can stand in a fire.

flame resistant vs flame retardant break image (2)

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What Are Structural Rivets?

What Are Structural Pop Rivets?

Structural pop rivets (structural blind rivets) are rivets that are specially designed with a locking mechanism to hold the mandrel in place. Before we talk about how exactly a structural pop rivet works, we should begin with how pop rivets in general work.

Pop or Blind rivets are comprised of two parts: the hat and the mandrel. A rivet hat is the portion of the rivet that deforms and stays in the installation. The mandrel is the portion of the rivet that is pulled into the rivet and mostly removed. A standard pop rivet mandrel has a designed flaw near the base of the mandrel which makes it easier to snap.

To install a rivet, first a hole needs to be drilled into the two materials. The hole should be just wide enough for the rivet hat to fit into. Once the rivet is sitting in the two materials, a rivet installation tool is used to pull the mandrel through the rear of the hat while keeping the hat pressed firmly against the installation surface. As the mandrel is pulled into the hat it deforms the back of the hat causing it to widen and pull firmly up against the rear of the installation surface. Once the torque is reached the weakened point of the mandrel will snap resulting in a complete rivet installation.



How Do Structural Rivets Work?

Structural Blind Rivet Diagram

Structural rivets work slightly different from the typical blind rivet. A structural blind rivet has a built-in (internal) locking mechanism that is designed to hold the mandrel inside of the rivet after the exposed portion snaps. This is commonly referred to as an interlock rivet. Notice how in the diagram to the right, the portion of the mandrel to the left of the hat is also much larger in a structural rivet than in a standard pop rivet.

There are several reasons structural rivets keep the mandrel locked inside the hat once installed:

  • Increased Shear Strength
  • Increased Pullout Strength
  • Higher Resistance To Vibrations
  • In some cases, they are also said to be considered weather-proof

How To Install Structural Rivets

Installing a structural blind rivet can be done basically the same way as installing a standard pop rivet:

  1. Line up the two installation materials
  2. Choose the appropriate drill bit to match the diameter of the structural rivet
  3. Drill a hole through both materials
  4. Insert the rivet through both materials into the hole
  5. Attach a rivet installation tool onto the mandrel
  6. Activate the tool to draw the mandrel out towards the installation surface
  7. Once the mandrel snaps it is completely installed

How To Remove Structural Rivets

Removing a structural rivet is just as simple as removing a standard blind rivet. To remove a structural rivet:

  1. Punch a starting hole into the center of the rivet
  2. Get a drill bit that is the same diameter as the hole originally drilled
  3. Add some lubricant to the drill bit
    1. *If the rivet is spinning, cover it in tape to prevent it from spinning
  4. Drill through the rivet with the drill bit until it goes completely through the hole

How To Install Rivets With A Lever Rivet Tool

How to Install Structural Rivets

Common Industry Uses For Structural Rivets

  • Commercial Vehicles
  • Sheet Metal
  • Electrical
  • HVAC
  • Agricultural Equipment



Pop/Blind Rivet Installation Tools

Hand Operated Riveter
Hand Riveter
Industrial Lever Riveter
Industrial Lever Riveter
Battery Operated Riveter
Battery Operated Riveter
Pneumatic Riveter
Pneumatic Air Riveter

*Pro Tip: Rivet measuring can be quite confusing try using an Rivet Gauge or our all-encompassing Rivet Guide to answer all of your rivet questions!

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Well Nuts – What Are They And How Are They Used?

What Are Well Nuts?

well nuts pre-installation

A Well Nut is a removable rivet nut made of two parts. A flanged rubber portion made of EPDM Neoprene and a brass insert nut. Well nuts only require one side of the hole to be exposed so they can be used for blind fastenings.

How Do Well Nuts Work?

A well nut, also called a rubnut, rubber nut or rawlnut, is a fastener used when something needs to be connected to a surface (in most cases where only one side is available).

Installing well nuts is a simple task:

  1. A hole must be drilled into the installation material. The hole will need to be the diameter of the rubber portion of the insert.
  2. Then slide the insert into the hole so that the flange is the only portion of the nut exposed. At this point, a hole must be drilled into the material you wish to attach if it has not been drilled already.
  3. Slide a washer onto the machine screw. You want to use a washer to press down on the flange portion of the well nut. Otherwise, the well nut will try to spin during installation.
  4. Line up the two holes and insert a machine screw that matches the threading of the well nut.
  5. Begin driving the machine screw (and washer) into the threads. As the well nut tightens, the rubber portion will start to deform and pull against the back of the installation surface creating a tight strong hold.

Are Well Nuts Waterproof?well nut after being installed

One of the most common questions about well nuts is “are they waterproof?” Yes, well nuts are considered to be a waterproof fastener but it is more accurate to call them water-resistant. Well nuts create a waterproof hole by tightly pressing the deformed rubber over and into the hole to completely seal it.

There are several ways in which they will not create a waterproof seal:

  • If the Rubber on the nut dries out
    • Rubber will eventually dry out causing cracks in the nut. This can cause leaks and will eventually need to be replaced. Time to replacement will vary but salt water environments may decrease the life of the rubber.
  • If the nut becomes submerged in deep depths
    • Even though these nuts are considered to be waterproof, after a certain depth the pressure buildup on the fastener may cause the rubber to deform further and lose its seal on the hole.
  • If the screw loosens on the nut
    • Screws can loosen over time due to accidental shocks and vibrations. If the screw begins to loosen, the rubber will begin to retake its original shape and break the seal on the hole. We recommend using a threadlocker solution when installing fasteners to prevent accidental loosening.



What Are Well Nuts Used For?

Well nuts are mostly prized for their water resistant, marine grade and blind fastening properties but can be used in many different situations. These blind insert rivet nuts can be used to deter vibrations and shocks in machinery. They are also quite common in compressors and mirrors for similar reasons.

Well nuts also provide a unique quality most fasteners do not. They can act as an insulator between two materials to prevent galvanic corrosion from occurring.

Well Nuts Vs. Rivnuts

Well nut benefits:

  • Water Resistant
  • Marine Grade
  • Blind Fastening
  • Deter Negative Effects Of Vibrations and Shocks
  • Easily Replaceable

Rivnut Benefits:

  • Many Different Materials
  • Blind Fastening
  • Significantly Stronger Pull-Out Strength

*Pro Tip: While well nuts are an excellent and versatile fastener, their grip is almost exclusively based off of the deformed rubber forming a hold over and inside of a hole. Due to this, well nuts have a weaker pull-out strength than many other fasteners and this consideration should be weighed when preparing for an installation.

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Double Expansion Anchors – How Do You Use Them

What Is A Double Expansion Anchor?zinc double expansion anchors

A double expansion anchor is a type of masonry anchor used for anchoring into materials of questionable strength or quality. In the world of masonry anchors, most rely on deforming a portion near the bottom of the anchor once inside a hole to prevent the anchor from coming loose.

Double expansion anchors differ from other masonry anchors. Instead of the bottom portion of the anchor expanding dramatically to create a strong grip, the entire anchor expands, but only slightly, in size to distribute the pressure over the entire surface area of the anchor.



When Do You Use One?

Basically, most masonry anchors are one way entry devices; they’re not meant to come out. In large slabs of concrete, most of these anchors work fine because the concrete is so strong that the anchors can place a large amount of force against it without risk of damaging the concrete. This becomes a problem with certain masonry materials.

Brick is a perfect example of a softer small masonry material. Due to its size and shape, brick can be considered delicate. Common expansion anchors placed in brick will almost certainly crack or damage the brick.

A double expansion anchor would be used when the material being installed in is of a weak material or of questionable quality. They expand evenly and distribute their holding power over the entire hole. This minimal expansion over a much wider surface area still provides a strong holding power that does not damage the brick.

double expansion anchors pre and post expansion

Installing A Double Expansion Anchor

To install a double expansion anchor, follow the steps below:

  1. Using an SDS drill bit, drill a hole into the brick the same diameter as the anchor. The hole will need to be slightly longer than the anchor in-depth.
  2. After cleaning out and debris from the hole, insert the double expansion anchor into the hole with the threaded portion near the bottom.
  3. Next drill a hole through the material that will be anchored to the brick.
  4. Line up the holes and use a matching machine screw to catch the threads of the anchor. The initial spins can be done by hand.
  5. Using a screwdriver, tighten the machine screw until it tightens against the surface of the material being connected to the brick. *Note: The length of the machine screw will vary depending on what you are attaching to the brick.

One of the unique things about double expansion anchors is that they can be easily removed from an installation hole and reused. To remove one simply take out the machine screw and it will form back into its original shape. Then it can be removed from the hole.

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