Many people often get confused for a bolt, screw, and a stud. The rod made with threads and a head is known as Bolt and the tip closes alongside with the nut. A screw is an externally threaded rod which can be inserted into the holes with the threads. A stud is a large headed piece that projects from the surface. Now you are clear with a bolt, screw, and a stud.
There are different types of bolts and each bolt has their unique feature and their uses in different applications. They are as follows –
Sleeve Bolts –
Sleeve Bolt is Stainless Steel Five Piece Powers Bolt. There are two variants in the sleeve bolts. They are 3 / 8 inch diameter bolts and 1 / 2 inch diameter bolts. These bolts are made with plated steel and can be easily replaced. Sleeve bolts consist of hex bolt head and can be easily identified. The longer versions of these bolts have two sleeves but they are still known as five piece bolts. These bolts have more strength than wedge bolts and have been used in many applications.
Wedge Bolts –
Wedge Bolt is also a stainless – steel power stud bolt. There is also a non – stainless steel double sleeve stud bolt. Wedge bolts can be identified when a threaded shaft and nut is seen. They have a small clip at the top which holds the nut and shaft tight. They also come in 3 / 8 diameter inch and 1 / 2 diameter inch bolts. Redhead Wedge Bolts are mostly used and are generally seen in stores but the disadvantage is that they are not of much strength. As mentioned earlier, Wedge bolts are weaker than the Sleeve bolts and they make more errors as they deform.
Glue – In Bolts –
Glue – In Bolts are the strongest type of bolts of all the bolt types. They are not only strongest but also longest and ever – lasting. They can be used for both soft rocks and hard rocks. These are mostly used where stress corrosion cracking is a major concern. If the hole size is bigger than the bolt size, some glue can be placed along with the hole so as to give a tight grip to the bolt. If they are not fitted properly, they may be the weakest bolts of all the bolt types. The only disadvantage with the glue – in bolts is that they are not removable once they are attached.
Compression Bolts –
These Compression Bolts are also known as Button Heads as the tail end of the bolt looks like a button. The length of the bolt varies from 1.25 to 2 inches in length and 1 / 4 inch in diameter. These bolts have split shafts which help to hold the hole when hammered. Hammering makes the split shafts come together only at the place of contact with the holes and thus a fine grip can be obtained. This fit is also known as Force Fit.
Sheath Bolts –
These bolts are of two types. Star Dryvin bolts can be easily identified by a star printed on it. The Taper Bolt has a hex head with no threads but a stud sticking through. Taper bolts can be confused with self – drill bolts but make some difference between the two.
Self – Drill Bolts –
The best way to determine a self – drill bolt is the large machine bolt head. These bolts act themselves as a drill bit as they drill quickly. These self – drill bolts were mostly used in olden days.
Petzl Long Life Bolts –
These are 1 / 2 inch in diameter and 2 inches in length stainless steel bolt and has a steel pin set in the shaft. They are very strong and easy to place. The life span of these bolts are very high but are not safe in medium to soft rock.
Torque Bolts, Aluminum dowel bolts, and Zamac Nailins bolts were once used but are not popular nowadays.
