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Anchor Bolts | DYNABOLT

Supplier: Ramset

As far back as 1963 the “DYNABOLT” was being manufactured and marketed by RAMSETTM worldwide.

Price Guide: POA

It was a revolutionary design that incorporated all components to give a complete anchor for the many applications requiring materials to be fastened to concrete, brick and other masonry materials.

It was in fact a revolutionary new DYNAMIC BOLTING FASTENER, hence the brand name "DYNABOLTTM" which is a registered trade mark of RAMSETTM FASTENERS.

‘DYNABOLTTM" now sets new standards for the performance of a high volume sleeve anchor.

Simply, the DynaboltTM is a major step forward in expansion anchor technology and is the first “sleeve type” expansion anchor to offer the combined advantages of a secure fixing, with a controlled and powerful “pull down” feature, which makes DynaboltTM suitable for a wide variety of applications.

  1. Cleaning the hole
  2. Correct insertion of the capsule
  3. Special adaptors and machines to set the stud bolt under rotary hammering action to ensure proper mixing of the components.
  4. Observation of cure times before applying the load.

Corrosion resistance
  • The corrosion resistance of the zinc cobalt coating effectively increases the corrosive resistance to the normal zinc passivated coating.
Special finishes
  • It is recommended that in an increased corrosive environment, either a Ramset Galv. DYNABOLT PLUSTM or Grade 316 stainless steel DYNABOLTTM is used.
Clamp Down Capacity
  • The DYNABOLTTM Anchor has a collapsible sleeve. This enables extra firm clamping of the fixture, i.e. once the anchor is firm on the fixture the sleeve will collapse a distance of half of the diameter of the anchor thus pulling the fixture down this distance flush against the substrate.
Quality control
  • Built into the DYNABOLTTM Plush sleeve design is a directional arrow indicator to ensure that the correct sleeve assembly for DYNABOLTTM.    It is also a quality check that can be carried out on site. The direction of the arrow on the sleeve should always face downwards. 


A DYNABOLT PLUSTM is a complete masonry anchoring device. It is supplied as a complete assembly comprising:

  1. A TAPERED END, threaded bolt.
  2. AN OUTER EXPANSION SLEEVE, depending on the length it may also be supplied with spacer sleeves.
  3. A FLANGED hexagon nut or post screw of the countersunk, flat head, round head, flush head type.
  4. Other special types Hook Bolt, Eye Bolt, etc.
It is manufactured from MEDIUM STRENGTH STEEL.

The tapered end of the bolt is cold formed on conventional cold heading machines, it is then cut off to length and the thread is rolled onto the top of the bolt.

The expansion sleeve is stamped from flat strip and must only be fitted onto the bolt one way, the three slotted end of the sleeve must rest down on the tapered end of the bolt to enable expansion to take place when drawing the tapered end of the bolt upwards into the expansion sleeve. The flanged nut types are standard components that are fitted above the expansion sleeve and are screwed together by finger pressure only.


Generally speaking, wherever powder actuated fastening is not acceptable, you should always investigate the reasons why. If it is reasons of prejudice you may have a job of re-educating to do, as that person may have been guided by hearsay, or some previous experience based on bad application or poor performance.

Applications can be changed. It could be that the correct fastening done by Powder Actuated Tools could be a much quicker and cheaper proposition on an in-place cost basis.

The high cost of labour is a most important factor when considering alternatives to a P.A.T. Fastening.

In the main, DYNABOLTTM anchors are used where any or all of the following factors are considered important:

  • Higher capacity than P.A. Fasteners.
  • A removable fixture.
  • Neatness of fastening every time.
  • Through fastening giving accurate fixing every time.
  • Because the base material is too hard or brittle for P.A.T.(i.e. granite, rock, bluestone, solid or wire-cut bricks, etc.)


It is essential that you should learn the knack of how to install DYNABOLTTM ANCHORS correctly, practical experience is the best teacher.

The DYNABOLTTM does not rely on the bottom of the hole to achieve expansion. During the tightening up process the tapered end of the bolt is drawn upwards into the expansion sleeve thus forcing the bottom of the sleeve outward giving a positive 360 degree expansion against the side of the drilled hole.

The more you tighten the nut down on the top of the DYNABOLTTM the more you will draw the tapered end of the bolt up through the expansion sleeve. By over tightening the nut the only effect you will have is to draw more thread up through the nut until the bolt snaps or the thread strips.

When torquing up (tightening) DYNABOLTTM, a good rule of thumb is to tighten the nut 3 to 4 full turns. Refer to the RamsetTM TECHNICAL MANUAL for correct torque information.


When drilling the hole into masonry you should always think of the total system concept that we have, when using RamsetTM. We supply the correct drilling machine (DynaDrillTM Rotary Hammers) and we have the correct size tungsten/carbide tipped masonry drill bits. By promoting and using the total fastening system you will ensure that our anchors will give optimum performance.

You should always drill the hole equal to or greater than the required embedment of the DYNABOLTTM.

Many applications call for drilling into base materials, a masonry drill will not remove all of the clippings and dust (commonly called swarf) from the hole and unless you have completely cleaned out the hole, the DYNABOLTTM could come to rest on this swarf and prevent the anchor from pulling down neatly onto the material to be fastened.
In most cases where product complaints have occurred one or the other installation steps have been ignored or preformed incorrectly (usually the setting under rotary hammer action).