Drop-in Anchor (Internal Thread)
Internally threaded drop-in anchor for flush, permanent fixing in concrete. The knurled body expands at the bottom when driven with a setting tool, giving high pull-out values; bolt can be removed and re-fitted at any time.
| Size | M6 / M8 / M10 / M12 / M16 / 1/4" / 3/8" |
|---|---|
| Length | 25–65 mm |
| Material | Zinc alloy / carbon steel ZP / SS304 / SS316 |
| Body | Knurled with expansion slot |
| Install | Pre-drill, drop in, set with punch tool |
| Application | Concrete, railings, machinery, suspended pipes |
| Packaging | Box / bulk carton |
| MOQ | 1,000 pcs per size |
About the Drop-in Anchor (Internal Thread)
A drop-in anchor leaves nothing proud of the surface: the body sits flush in the concrete and the thread is inside it, so a bolt or threaded rod can be fitted, removed and refitted without touching the anchor. That is what makes it the standard choice for suspended services and railings where the fixing has to stay serviceable.
Typical applications
- Suspended pipe and conduit — Threaded rod drops for pipe hangers, cable tray and duct supports.
- Railings and handrails — Flush base fixings where a nut on the surface would be a trip or snag hazard.
- Machinery and plant — Bases that have to be unbolted for maintenance.
How to choose the right specification
- Internal or external thread — Drop-in for flush internal threads; wedge anchor where a stud can stand proud.
- Material by environment — Zinc plated for indoor, SS304 / SS316 for exterior and wet areas.
- Setting tool — Each size needs its own punch tool — order them with the anchors so the installer is not improvising.
Supply, packing and OEM
Box or bulk carton, 1,000 pcs per size per size, with setting tools available in the same shipment. The knurled body and expansion slot are machined to a fixed depth so pull-out values stay consistent between batches.
Standard packing is box / bulk carton, minimum order 1,000 pcs per size per size, with mixed sizes accepted on a first order. Bulk orders typically ship within 25–40 days after deposit, FOB Shanghai or Ningbo — about 2.5 hours from our workshop in Danyang.
Most of this item ships to Canada, Europe, Australia, Japan, the Middle East and South America. Tell us the destination market and we match the sizes, thread standard, marking and packing language it uses — metric for Europe, Japan and South America, imperial where the trade still buys in inches, and carton copy in the language your customers read — then quote FOB, CIF or DDP against your order size.
Related products: wedge anchor, beam clamp, Nylon Wall Plug (Expansion Anchor).
Further reading: threaded rod hanger types — what fits which structure
More from Expansion Bolts & Anchors
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