Drop-In Steel Anchor

A drop-in steel anchor is an auxiliary fastening element for securing structures in concrete and other dense substrates. Its purpose is to hold the fastener in the wall or slab, ensuring high load-bearing capacity and pull-out resistance.

In terms of purpose, the anchor is similar to a wall plug, but has higher strength and load resistance. It is used for hard materials: dense concrete, solid brick masonry, and natural stone.

Design features

A steel drop-in anchor consists of three main components:

• A metal sleeve with slots on its side surfaces.
• A sleeve installed on the expansion element.
• A threaded expansion element into which the threaded fastener is installed. Bolts, screws, studs, and other fasteners of the corresponding diameter are used with the anchors.

The design is solid, without welded seams, which increases the reliability of the product. Carbon steel anchors are used under high loads – for fastening heavy structures. Brass anchors are used for lighter mechanical loads.

Operating principle and applications

The anchor is installed into a prepared hole of the corresponding diameter. The slots in the sleeve act as expansion arms: when the conical expansion element is driven in, the sleeve’s petals open and provide secure fixation in the hole. The high pressure created on the hole walls means the fastener can only be used in dense substrates – hollow and porous materials would be destroyed.

The anchor is driven in with a special tool; for secure fixation, the surface is fitted with additional notches. The protective zinc coating resists corrosion and prevents premature degradation of the material.

Steel drop-in anchors are used for the following tasks:

• Installing furniture: the anchor provides secure attachment to walls and resistance to external loads.
• Mounting suspended structures to slabs. Such products are designed for minor vertical loads and are used only for fastening lightweight items.
• Mounting battens, bars, slats, and frames for the subsequent installation of finishing materials. Anchors allow the frame to be secured to a dense load-bearing substrate, where reliable fixation is difficult to achieve by other means.

Before installation, a hole of the required depth and diameter is prepared in the wall – using an electric drill with a carbide-tipped bit or a diamond core bit. The anchor is installed quickly and is ready to withstand significant external loads immediately after installation.

Order terms

FLOK supplies drop-in anchors made of steel, designed for intensive loads.

Technical description of the drop-in steel anchor

Code	Drilling diameter	Outer diameter × length	M, internal thread	Quantity per pack, pcs	Quantity per box, pcs
Ø 10
TSW-6	8	8x25	6	100	1800
TSW-8	10	10x30	8	50	90
TSW-10	12	12x40	10	50	90
TSW-12	15	15x50	12	25	45
TSW-16	20	20x65	16	25	45

Anchor type Anchor thread diameter d₀ Drill diameter mm L = h₁ Anchor length = hole depth mm f Thread length mm Permissible loads in kN Concrete C20/25 Pull-out / Shear Installation tool Packaging pcs. Weight kg/1000 pcs.
LA 6	M6	8	25	11	2.1/1.9	LT 6	100/1000/56000	6.4
LA 8	M8	10	30	13	2.7/3.3	LT 8	100/1000/56000	12.0
LA 10	M10	12	40	15	3.6/5.1	LT 10	50/500/28000	22.2
LA 12	M12	15	50	19	5.9/7.1	LT 12	50/250/14000	46.3
LA 16	M16	20	60	25	8.7/10.5	LT 16	25/125/7000	108.0
LA 20	M20	25	80	33	11.9/14.3	LT 20	20/100/5600	197.2
LAH 6	M6	8	25	11	1.0/1.1	LT 6	100/1000/56000	6.8
LAH 8	M8	10	30	13	1.6/1.3	LT 8	100/1000/56000	12.2
LAH 10	M10	12	40	15	2.2/1.5	LT 10	50/500/28000	22.8
LAH 12	M12	15	50	19	3.4/2.6	LT 12	50/250/14000	46.3
LAH 16	M16	20	60	25	5.6/4.6	LT 16	25/125/7000	96.8
LAH 20	M20	25	80	33	7.9/6.6	LT 20	20/100/5600	192.0
LAL 6	M6	8	25	11	2.1/1.9	LT 6	100/1000/56000	6.0
LAL 8	M8	10	30	13	2.7/3.3	LT 8	100/1000/56000	12.0
LAL 10	M10	12	40	15	3.6/5.1	LT 10	50/500/28000	22.0
LAL 12	M12	15	50	19	5.9/7.1	LT 12	50/250/14000	46.0
LAL 16	M16	20	60	25	8.7/10.5	LT 16	25/125/7000	110.0