Indospark Construction Services

Through Bolt Anchors TBA

Through Bolt Anchors TBA
steel, zinc plated/hot dipped galvanised 20-25 & 40-45 microns / stainless steel A4-316

Ideal for Fixing Steel Structures /Constructions Metal Profiles
Sole Plates Brackets
Railings Windows
Machine foundation Gantries
Timber Constructions Beams & Supports
The threaded body is made by cold forging which makes the end product very strong, hard and precise.
Independent three piece sleeve with dimples prevents anchor from spinning during installation, gurantees a balanced expansion and a secure function of the anchor.
Available in zinc plated, hot dipped galvanized and stainless steel to suit any environment.
The cylindrical cone allows displacement of the anchor with maximum resistance without a sudden breakage of the fixture.
Due to cold forging, the surface of the cone is very hard and even. This guarantees a quick and reliable tightening.
Impact section protects the thread when hammering the anchor into the hole.
Achamfered lower end of the sleeve prevents jamming between the cone and the sleeve.
Mechanical expansion allows immediate load application.
Can be installed through the fixture, improving productivity.
Rounded cone end helps the anchor to go into the hole especially when mounted through wood.
Long thread bolts for greater fiexibility.
  • Description
  • Product Range
  • Installation
  • Loadchart
Description :

The through bolt anchor TBA can be installed through the work piece. This saves considerable time in installation avoiding alignment errors and provides an exceptionally efficient retention method for fixing to concrete and stone. Its firm fixing action permits repeated removal and replacement of the nut without weakening the anchorage. As the bolt is driven into the fixing hole the clip is compressed ensuring a tight interference fit. When torque is then applied to the nut the tapered section of the bolt retracts through the clip which expands to create a rapid and permanent grip.As for the internal threaded version TBA-I, it can be installed in normal drill holes without a setting tool.


1. Metallic anchor, with functioning principle by expansion and installation by controlled torque.
2. Male thread.
3. Use in non-cracked concrete.
4. Easy assembly.
5. Use for medium-high loads.
6. Manufactured in zinc plated steel.
7. Previous installation, or through the fixture hole itself.
8. Variety of lengths: assembly flexibility.
9. Covering: zinc plated ≥ 5 μm ISO 4042 A2J

 Before placing the anchor checks to be made to ensure the strength class of the concrete is not lower than that to which the characteristic loads apply.
 The concrete to be well compacted, e.g. without significant voids.
 Base material temperatures during installation: -5 / + 50 ºC (80 ºC in a short period of time)
 Anchors to be installed ensuring not less than the specified embedment depth, The edge distance and spacing to be kept to the specified values, no minus tolerances to be allowed.
 Drill to the minimum depth and diameter specified, maintaining perpendicular to the surface of the base material. Fixtureholes themselves can be used as template.
 When drilling holes, care to be taken not to damage reinforcement in close proximity to the hole’s position. Action to betaken in the event that drilling is aborted, e.g. due to encountering reinforcement. It is recommended to either install the anchors immediately beside the aborted drill hole, provide that anchoring depth is increased by the depth of the aborted drill hole, or make a new drilling at a minimum distance away of two the depth of the aborted hole. Alternatively, a smaller distance may be chosen, provided the aborted drill hole is filled with high strength mortar. However, unless the aborted drill hole is filled with mortar, it is not permissible under a shear or oblique tension load for it to be closer than installation depth hnom in the direction of load application.
 Thoroughly clean hole from dust and drilling fragments.
For holes to be subjected to temperatures below 0 ºC, measures to be taken to avoid the ingress of water into the hole and subsequent risk of local cracking of the concrete due to ice expansion.
To introduce the anchor into the hole up to the embedment depth through the fixture. A hammer can be use to assure this depth. Do not apply any intermediate lay between the fixture and the washer (sealant, etc.). Apply the specified torque with a torque wrench.
In case of fixture holes with diameters higher than specified use washers of bigger diameter and thickness, but in this case it is not assured a correct distribution of shear loads amongst all the anchors of a same group. The shear load will be applied on those anchors with the correct diameter on the fixture.

Calculation example -
 Fixing a load tension of 2.000 kg 2.000 kg ≈ 20 KN Increasing coefficient for loads:  1.4
 Using two MTA M14 anchors  
 Pull load characteristic resistance for MTA M14 anchor:  30.0 KN
 Concrete failure  
 Concrete reduction for resistances coefficient:  1.8
 Checking: increased load must be lower than reduced resistance  
 20 KN x 1.4 ≤ 2 x 30.0 KN / 1.8  
 Wedges distance must be longer than 225 mm and distance to any edge must be longer than 113 mm as well.  
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