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Our Design Catalogue

Drop In Anchor


Welfast Drop-In Anchors are internally threaded anchors for bolts and threaded rods. These are zinc plated steel tubular expansion shield and a solid, cone-shaped expander plug. The shield has four equally placed slots for a portion of its length and the bottom part may be knurled. The shield also has a smooth, flangeless top that allows for either flush or countersunk installation. The bottom lip of the shield is tapered to allow maximum depth and holding power.



  • Easy installation.
  • Reduced setting energy.
  • Easy inspection.
  • Ideal for setting in cavity ceilings.
  • Low anchoring depth reduces drilling time and thus cost efficient installation.

  • Pipe suspension
  • Air-conditioning and Ventilation Installations
  • Drain Covers
  • Sprinkler Systems
  • Consoles
  • Platforms
  • Plumbing
  • Steel Constructions
  • Gratings
  • Cable Trays
  • Facades
  • Suspended Ceilings

How to Install :

  • Select the right plug size.
  • Drill a hole in the concrete using a hammer drill and carbide tipped masonry drill bit matching the bit size with the outside diameter of the drop-in anchor being used. Make sure the hole depth exceeds the minimum embedment depth.
  • Clear all the debris or drilling dust from the hole.
  • Drive the anchor into the hole until it is flush with the surface of the concrete.
  • Using proper sized setting tool, expand the anchor setting tool into the anchor followed by several hammer blows.
  • Proper installation can be verified when the shoulder of the setting tool is flush with the top of anchor.
  • Below Surface Installation:
    • Drill hole deeper than anchor length.
    • Thread bolt into anchor.
    • Hammer anchor into hole until bolt head is at desired depth.
    • Remove bolt and set anchor with setting tool.



Suitable for :

  • Concrete
  • Dense Natural Stone

Also known as :

Female Anchor Lip Drop-In
Coil Thread Drop-In Mini Drop-In


Technical Specification :

Sr. No. Size Inner Thread Diamter (mm) Outer Thread Diameter (mm) Drill Hole (mm) Recomended Loads For 30 N/mm Concrete Quantity (pcs)
Tensile Load (kN) Shear Load (kN) Box Carton
1 M6 6 8 8 2.3 2.1 100 4000
2 M8 8 10 10 3.5 2.3 100 4000
3 M10 10 12 12 5.1 2.9 100 1000
4 M12 12 16 16 7.8 5.5 50 500
5 M16 16 20 20 10.3 8.7 50 250

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