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Drop-in anchors are deformation-controlled expansion anchors designed for attaching various decorations, utility or construction elements to a solid base material such as concrete or masonry. This anchor is composed of a hollow sleeve and an internal expander plug as shown in the following picture:

Three drop-in anchors show their hollow sleeves with four equally spaced slots.
Four equally spaced slots are cut longitudinally up from one end of the hollow sleeves to form expandable shirts.
Two drop-in anchors show their internal expander plugs.
Internal expander plugs are inside the hollow sleeves for forcing the anchors to expand and be locked in place.
  • A hollow sleeve
    • Four equally spaced slots cut longitudinally to create an expandable shirt at one end.
    • With internal threads at the other end of the sleeve to accept a bolt or a threaded rod easily.
    • Special patterns for higher holding strength as it increases more friction between the anchor and drilled holes.
  • An internal expander plug
    Located inside the sleeve above the slots, this solid, cone-shaped plug is gone through case hardening and tempering to avoid galling and binding during expansion effectively. It works by forcing the expandable shirt outward for locking the anchor in place.


  • Qualified - Shunfeng adopts high quality carbon or stainless steel 304, 316 as the material.
  • Internal threaded - Allowing hardware like hex bolts and threaded rods to be mounted & removed easily, leaving the drop-in anchor in place.
  • Versatile - Whether it be medium or heavy-duty application, our range of drop-in anchor is the best solution.
  • Long lasting - Our range of drop-in anchor is zinc-plated for a longer lifespan by discouraging corrosion.
  • Easy to install - Just drop the anchor into the pre-drilled suitable sized hole, and then use a setting tool to expand the anchor.
Two lights are attached to the concrete ceiling using drop-in anchors.
Drop-in anchors perform well in fastening the lights to the concrete ceiling.

Drop-in anchors can be used to fasten a variety of objects such as

  • Gutters.
  • Fire sprinkler pipes.
  • Flower pots.
  • Hanger brackets.
  • Cable trays.
  • Window box.
  • Signage.
  • Suspending grids.
  • Struts.
Specification of drop-in anchors - Metric
Thread size Outside diameter Thread depth Anchor length Pull out loads (kgs)
M6 8 mm 10 mm 25 mm 850
M8 10 mm 14 mm 30 mm 1350
M10 12 mm 15 mm 40 mm 1950
M12 16 mm 20 mm 50 mm 2900
M16 20 mm 25 mm 65 mm 4850
M20 20 mm 25 mm 80 mm 5900
Specification of drop-in anchors - US
Thread size Drill bit diameter Thread depth Anchor length Pull out loads (lbs)
1/4" 3/8" 1/2" 1" 2200
3/8" 1/2" 5/8" 1-9/16" 4400
1/2" 5/8" 3/4" 2" 7040
5/8" 7/8" 7/8" 2-1/2" 11880
3/4" 1" 1-1/4" 3-3/18" 12980
A hole in a properly size is drilled and cleans allowing enough room for drop-in anchors. Step 1.
Drill a suitable sized hole slightly deeper than the length of your drop-in anchors. Use a vacuum cleaner to remove the debris from the hole.
A drop-in anchor is put into the hole. Step 2.
Push your drop-in anchor to the bottom of the hole. A hammer can also be used for easy tapping if necessary.
A drop-in bolts are expanded by a setting tool and a hammer. Step 3.
Use a setting tool to drive the internal expander plug to the bottom and force the tabs between slots outward. The anchor is properly expanded when the shoulder of the setting tool touches the face of the anchor.
A fastened drop-in anchor is used to attach a steel bracket to the solid base material. Step 4.
Screw a bolt or a threaded rod to the anchor, attaching the things required to be fastened to the solid base material as shown in the left picture.

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