To fix a screwbolt into concrete
Use hammer drill & SDS drill bit for concrete, for brick and block work use rotary percussion.
Drill bit diameter :- ensure correct diameter is selected for the fixing to be used and is not worn below minimum tolerance.
NB. when drilling into dense concrete observe the maximum efficient working life of the drill bit.
Hole depth must be 2 times diameter plus the full working length of the bolt, to allow for the dust created when the bolt is installed into the pre-drilled hole.
Remove surplus dust from the drilled hole by easing the drill bit up and down within the hole and blowing clear.
To install the screwbolt use a branded ratchet spanner with a full hexagon socket, or impact wrench. We recommend the use of the Bosch GDS 18E (up to 16mm bolts) or Bosch GDS 30 (20-24mm bolts) or similar. To ensure that you do not ream out the drilled hole set the impact wrench to slow start.
This will also avoid any excessive torque stress being applied to the bolt.
Apply pressure to head of bolt to ensure engagement of first thread.
If resistance is encountered when screwing down the bolt, simply unscrew one turn to release trapped dust, and then continue to tighten down. The bolt is set when the built in washer, at the underside of the head of the bolt, meets the face of the object being fixed to the substrate.
No further tightening of the fixing is necessary.
Please follow this guide when fixing EXCALIBUR SCREWBOLTS
- Do use the correct diameter drill
- Do drill square to face of structure
- Do take note of Correct drilling depth (embedment plus two diameters),
- Do use depth gauge on drill
- Do check hole is clear of dust and check depth is correct
- Do apply pressure on head of bolt to ensure thread starts to cut into the substrate If insertion appears to 'jam'
- Do rotate Screwbolt backwards two turns to release trapped dust
- Do screw the Screwbolt fully down, so that the underside of the flange is in contact with the item being fixed
- Do refer to below for correct drill sizes, minimum hole depths, etc.
- Do not use airlines to install or remove bolts
- Do not use hammers to install
- Do not use worn or wrong diameter drills
- Do not drill holes at an angle
- Do not fix into shallow holes
- Do not allow dust and debris to fall into the hole
- Do not allow the Screwbolt to simply turn without cutting into the substrate
- Do not exceed maximum torque (see chart below)
- Do not ignore these instructions
- See below for drill sizes, hole depths, torque etc
The Excalibur Screwbolt is guaranteed for single use. If used more than once, it will be at the customer's risk