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The most common types of machine screw head shapes are pan head, flat head, round head, oval head, truss head and hex head. While round heads are probably used most often, flat heads are particularly useful when the screw needs to be flush with the surface it’s screwed into The two main drive types associated with machine screws are slotted (flat head) and Phillips. There are also a number of specialized drives that they can come in, these are typically associated with tamper-resistant screws. Some of these drive types include, – six pointed, spanner, and trident to name a few.

Machine screws are used to put metal parts together. They come in a variety of head types and lengths. Machine screws are one of the “exceptions” to our rules in that while they normally thread themselves directly into a hole within the metal, they do, on occasion may be used with a nut.


One of the most important commercial fasteners in use today is the Self-Tapping Screw and self drilling screw. Among the earliest “engineered” fasteners, Self-Tapping and drilling  screws were made from hardened steel and its use was instrumental to the industrial revolution. Still in use today, there are now many types and styles of Self-Tapping and drilling screws made to perform specific fastening jobs.

Some self-tapping screws are also self-drilling, which means that, in addition to the tap-like flute in the leading threads, there is also a preliminary drill-like fluted tip that looks much like the tip of a center drill. These screws combine a thrilling-like action and the fastener installation itself into only one driving motion (instead of separate drilling, tapping, and installing motions); they are thus very efficient in a variety of hard-substrate applications, from assembly lines to roofing.

Self-tapping screws have a wide range of tip and thread patterns, and are available with almost any possible screw head design. Common features are the screw thread covering the whole length of the screw from tip to head and a pronounced thread hard enough for the intended substrate, often case-hardened

For hard substrates such as metal or hard plastics, the self-tapping ability is often created by cutting a gap in the continuity of the thread on the screw, generating a flute and cutting edge similar to those on a tap. Thus, whereas a regular machine screw cannot tap its own hole in a metal substrate, a self-tapping one can (within reasonable limits of substrate hardness and depth.


The screw anchor without a plug The innovative fastening system for concrete and masonry. The MULTI-MONTI anchor gives you a positive locking connection that is free of expansion pressure – in half the time. For outdoors: MULTI-MONTI in stainless steel.


The fixing-system MULTI-MONTI®
is based on a completely new concept in
structural fasteners. By threading the fixing into the substrate material, the thread
undercuts and thus enables a positive and safe threaded anchorage like that of
an undercut anchor. The threaded anchorage is not subject to any expansion
pressure and fixed without preload in the base material.


  • Hexagon head with combined washer
  • Heavy-duty anchor, hexagon head
  • Hexagon head with washer
  • With flange head
  • Countersunk head
  • PanHead
  • Eye-bolt-anchor
  • With metric stud
  • With internal metric thread
  • Pre-set anchor with metric stud


  • Hexagon head with combined washer and cone
  • Bright zinc plated
  • Diameters [mm]: 16,0
  • Lengths [mm]: 130
  • Temporary fastenings of site equipment for example props, push-pull props, guardrails or scaffolding
  • Dissassembling and reusability is permitted when using checking gauge
  • Approved for the use in young concrete with a compression strength of at least fc,cube > 10 N/mm²
  • Clearance hole diameters from 17 – 23mm in bracings can be covered with one screw
  • Settings can be carried out with machines as no defined installation torque is required
  • No expansion pressure
  • Safely applicable as no hidden mounting errors can occur
  • Approved and monitored product




A dowel is a cylindrical rod, usually made from wood, plastic, or metal. In its original manufactured form, a dowel is called a dowel rod. Dowel rods are often cut into short lengths called dowel pins.

Dowel Pins In Mild Steel, Stainless Steel 303 & Stainless Steel 316L CNC Machined.

Styles: DIN 7, ISO 2338, ISO 8734, ISO 8735


square nut DIN 557 is a four-sided nut. Compared to standard hex nutssquare nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening (though also greater resistance to tightening). Square nuts are typically mated with square-headed bolts.

Square nut size refers to its nominal thread diameter. Typically, machine screw sizes range from about #2 to 1/2″ and regular from 1/4″ to 1 1/2″ & M6 TO M36.

This type of nut area four-sided nut. Compared to standard hex nuts, square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening. They are also much less likely to become rounded-off after repeated loosening/tightening cycles.


An lifting eye bolt is a bolt with a loop at one end. They are used to firmly attach a securing eye to a structure, so that ropes or cables may then be tied to it

Machinery eye bolts are fully threaded and may have a collar, making them suitable for use with angular loads up to 45°. Eye bolts without a shoulder should not be used for angular loads.

Heavy forged eye bolts with a continuous eye may be forged with an integral shoulder, allowing their use for heavy off-axis loads.

Eye bolt with integral wall anchor

Eye bolts are often installed into masonry and so versions that form their own anchor bolt are commonly available. Most of these screw into some form of shield anchor. Some lightweight forms are not screwed, but rely on just the pull on the ring itself to expand the anchor.






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The distinction between a bolt, flange bolt and screw is commonly misunderstood. There are several practical differences, but most have some degree of overlap between bolts and screws.

The defining distinction as per Machinery’s Handbook is in their intended purpose. Bolts are for the assembly of two unthreaded components, with the aid of a nut. Screws in contrast are used in components which contain their own thread, and the screw may even cut its own internal thread into them Many threaded fasteners can be described as either screws or bolts, depending on how they are used.

Bolts are often used to make a bolted joint. This is a combination of the nut applying an axial clamping force and also the shank of the bolt acting as a dowel, pinning the joint against sideways shear forces.


Definition of T bolt. 1 : a bolt having a crosspiece for a head. 2 : a bolt with a head of square or rectangular shape intended to fit a T slot.

A bolt with a T-shaped head, made to fit into a T-shaped slot in a drill swivel head; by means of it the swivel head can be turned to any angle of inclination to drill a borehole. Also, a similar bolt made to fit into a T-slot in the bed of a machine, for the purpose of holding a piece of metal to be machined or to fasten a machine to its base.

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