Expansion shell bolts
Reinforced expansion shell bolts are designed to be used for roof and ribs support in mine working areas as an independent or secondary bolting support system. They are also used for the attachment of various components of mining equipment.
Bolt rods are made of plain AP 600 steel bar of ø18,3 mm according to ZN-97/AP-2 standard.
The rods vary in terms of shape and size of swelling at the bottom.
KE-3W and KE3-2K expansion shells of ø36 mm are the elements which set the bolt in the hole. The KE-3W shell consists of 3 serrated leaves and one plug while the KE3-2K shell consists of 3 serrated leaves and 2 plugs.
The following washer plates can be used with the bolts: square, square with a side hole, round, triangular and octagonal. The washer plates differ in press forming method and thickness.
The washers may have a conical or flat hole.
Washers with a side hole of ø 15 can be used for attaching elements of mining equipment.
They should be used if there is no hole in the rod. All the washers are made of 6mm plate.
Drill a hole of ø38 ± 0,5mm in diameter and length equal to the length of the bolt. Reassemble the bolt by placing the washer and shell on the rod. Place the boltin the hole and push until the washer rests against the rock surface. Turn the rod and as a result the shell expands in the hole. Tighten the bolt by applying at least 250 Nm torque in order to obtain the prestress of at least 30kN.
Bolting System
Cable, resin and expansion bolts, bolting system for mining, tunneling and construction industry.
Fasteners with a tapered shaft (tapping screws)
“Screw” - There is not a universally accepted definition of the word, “screw”. It generally refers to a smaller threaded fastener with a tapered shaft.
Wood Screw – Generally has an un-threaded portion of the shaft below the head. It is designed to attach two pieces of wood together.
Lag Screw (Lag Bolt) – Similar to a wood screw except that it is generally larger and it generally has a hexagonal head drive.
Sheet Metal Screw (Self-tapping Screw, thread cutting screws) - Has sharp threads that cut into a material such as sheet metal, plastic or wood. They are sometimes notched at the tip to aid in chip removal during thread cutting. The shaft is usually threaded up to the head. Sheet metal screws make excellent fasteners for attaching metal hardware to wood because the fully thread shaft provides good retention in wood.
Self-drilling screw (Teks(R) screw) - Similar to a sheet metal screw, but it has a drill-shaped point to cut through the substrate to eliminate the need for drilling a pilot hole. Designed for use in soft steel or other metals.
Drywall screw - Specialized screw with a bugle head that is designed to attach drywall to wood or metal studs, however it is a versatile construction fastener with many uses. The diameter of drywall screw threads is larger than the shaft diameter.
Particle Board Screw (Chipboard Screw) - Similar to a drywall screw except that it has a thinner shaft and provides better holding power in particle board.
Deck Screw - Similar to drywall screw except that it is has improved corrosion resistance and is generally supplied in a larger gauge.
Double ended screw (Dowel screw) - Similar to a wood screw but with two pointed ends and no head, used for making hidden joints between two pieces of wood.
Screw Eye(Eye Screw) - Screw with a looped head. Larger ones are sometimes call lag eye screws. Designed to be used as attachment point, particularly for something that is hung from it.
Here are some other types of threaded fasteners
Thread rolling screws - have a lobed (usually triangular) cross section. They form threads by pushing outward during installation. They may have tapping threads or machine threads.
Superbolt, or Multi-Jackbolt Tensioner 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.
Installation and removal of any size tensioner is achieved with hand tools, which can be advantageous when dealing with large diameter bolting applications.
Hanger Screw – A headless fastener that has machine screw threads on one end and self apling threads on the other designed to be driven into wood or another soft substrate.
Teks(R) is a registered trademark of ITW Buildex