Wedge Anchors (Torque-Controlled Expansion)
Torque-controlled wedge expansion anchors in the M6–M24 mechanical family band, effective embedment 40–150 mm — drill, clean, torque-set, load immediately. Widely qualified for cracked concrete and seismic work; hole-diameter tolerance is the governing installation risk.
Last updated: 2026-11
Specifications
The wedge anchor is the default torque-controlled mechanical expansion anchor: a threaded stud with an expansion clip that wedges against the hole wall as the nut is torqued. Setting is immediate — drill, remove dust, insert, torque, load — and the family is widely qualified for cracked concrete and seismic conditions, which is why most repetitive medium-duty details default to it. Its governing risk is geometric, not metallurgical: the clamp load is a function of hole-diameter tolerance and applied torque, so an oversize or under-cleaned hole leaves the wedge loose before any load arrives, and overtorque can strip the concrete locally. Capacity in the practical band sits slightly above a comparable concrete screw anchor of the same diameter, because the wedge bears on the concrete rather than cutting a thread into it. Qualification runs under ACI 355.2 (US) and ETAs issued under EAD 330232 (Europe).
| Type | Torque-controlled mechanical expansion anchor (wedge type) — torque sets the expansion, load applied immediately |
|---|---|
| Family size band | M6–M24 (mechanical expansion family band; individual products vary) |
| Effective embedment (h_ef) | 40–150 mm family band; capacity values are product- and size-specific from the ETA |
| Capacity positioning | Slightly above a comparable screw anchor of the same diameter — capacity bears on the hole wall, steel is not the limiting mode in this range |
| Cracked vs uncracked | Concrete cone breakout: k_ucr,N = 11.0 vs k_cr,N = 7.7 — a cracked-concrete cone value is about 70% of the uncracked figure; quote the value that matches your slab condition |
| Governing risk | Hole-diameter tolerance and torque discipline: overtorque strips the concrete locally, undertorque leaves the anchor loose before load |
| Qualification | ACI 355.2-24 (US); ETA under EAD 330232 (Europe); design to ACI 318-25 Ch. 17 or EN 1992-4:2018 |
| Seismic | Widely qualified across the mechanical family — the standard choice in many seismic details; verify category (C1/C2) on the specific report |
| Installation | Drill plus dust removal; torque-set on installation; immediate loading — no cure window |
| Relative installed cost | Low to medium; adds a washer and a torque pass over a screw anchor |
| MOQ / lead time | 500–1,000 pieces; standard production 15–30 days |
| Diameter | Minimum embedment | Drill bit diameter | Pull-out (lbs.) | Shear (lbs.) |
|---|---|---|---|---|
| 1/4" | 1-1/8" | 1/4" | 877 | 1082 |
| 5/16" | 1-1/8" | 5/16" | 892 | 1156 |
| 3/8" | 1-1/2" | 3/8" | 1223 | 3238 |
| 1/2" | 2-1/4" | 1/2" | 2999 | 5564 |
| 5/8" | 2-3/4" | 5/8" | 3749 | 6198 |
| 3/4" | 3-1/4" | 3/4" | 4978 | 9378 |
| 7/8" | 3-7/8" | 7/8" | 6294 | 13687 |
| 1" | 4-1/2" | 1" | 7329 | 17712 |
| 1-1/4" | 5-1/2" | 1-1/4" | 13162 | 24206 |
| Diameter (in.) | Length (in.) | Thread length (in.) | Minimum embedment (in.) | Torque (ft.-lbs.) |
|---|---|---|---|---|
| 1/4 | 1-3/4 | 3/4 | 1-1/8 | 5-10 |
| 1/4 | 2-1/4 | 3/4 - 1 | 1-1/8 | 5-10 |
| 1/4 | 3 | 3/4 - 2-1/8 | 1-1/8 | 5-10 |
| 1/4 | 3-1/4 | 3/4 - 2-1/8 | 1-1/8 | 5-10 |
| 5/16 | 2-3/4 | 1-1/2 | 1-1/8 | 5-10 |
| 5/16 | 3-1/2 | 1-1/2 - 2-1/4 | 1-1/8 | 5-10 |
| 3/8 | 2-1/4 | 7/8 | 1-1/2 | 25-30 |
| 3/8 | 2-3/4 | 1-1/8 - 1-1/2 | 1-1/2 | 25-30 |
| 3/8 | 3 | 1-1/8 - 1-1/2 | 1-1/2 | 25-30 |
| 3/8 | 3-1/2 | 1-1/8 - 2-1/4 | 1-1/2 | 25-30 |
| 3/8 | 3-3/4 | 1-1/8 - 2-1/2 | 1-1/2 | 25-30 |
| 3/8 | 5 | 1-1/8 - 3-1/2 | 1-1/2 | 25-30 |
| 3/8 | 6-1/2 | 1-1/8 - 4-1/4 | 1-1/2 | 25-30 |
| 1/2 | 2-3/4 | 2-1/4 | 2-1/4 | 50-60 |
| 1/2 | 3-3/4 | 2-1/4 | 2-1/4 | 50-60 |
| 1/2 | 4-1/4 | 2-1/4 - 2-3/4 | 2-1/4 | 50-60 |
| 1/2 | 5-1/2 | 2-1/4 - 3-3/4 | 2-1/4 | 50-60 |
| 1/2 | 7 | 2-1/4 - 4 | 2-1/4 | 50-60 |
| 1/2 | 8-1/2 | 2-1/4 - 4 | 2-1/4 | 50-60 |
| 1/2 | 10 | 2-1/4 - 4 | 2-1/4 | 50-60 |
| 1/2 | 12 | 2-1/4 - 4 | 2-1/4 | 50-60 |
| 5/8 | 3-1/2 | 1-1/8 - 1-3/4 | 2-3/4 | 75-90 |
| 5/8 | 4-1/2 | 2-1/4 | 2-3/4 | 75-90 |
| 5/8 | 5 | 2-3/4 | 2-3/4 | 75-90 |
| 5/8 | 6 | 2-3/4 - 4 | 2-3/4 | 75-90 |
| 5/8 | 7 | 2-3/4 - 4 | 2-3/4 | 75-90 |
| 5/8 | 8-1/2 | 2-3/4 - 4 | 2-3/4 | 75-90 |
| 5/8 | 10 | 2-3/4 - 4 | 2-3/4 | 75-90 |
| 5/8 | 12 | 2-3/4 - 4 | 2-3/4 | 75-90 |
| 3/4 | 4-1/4 | 1-3/4 | 3-1/4 | 150-175 |
| 3/4 | 4-3/4 | 2-1/4 | 3-1/4 | 150-175 |
| 3/4 | 5-1/2 | 3 | 3-1/4 | 150-175 |
| 3/4 | 6-1/4 | 3-1/4 - 4 | 3-1/4 | 150-175 |
| 3/4 | 7 | 3-1/4 - 4 | 3-1/4 | 150-175 |
| 3/4 | 8-1/2 | 3-1/4 - 4 | 3-1/4 | 150-175 |
| 3/4 | 10 | 3-1/4 - 4 | 3-1/4 | 150-175 |
| 3/4 | 12 | 3-1/4 - 4 | 3-1/4 | 150-175 |
| 7/8 | 6 | 3 | 3-7/8 | 200-250 |
| 7/8 | 8 | 2-1/4 - 4 | 3-7/8 | 200-250 |
| 7/8 | 10 | 2-1/4 - 4 | 3-7/8 | 200-250 |
| 7/8 | 12 | 2-1/4 - 4 | 3-7/8 | 200-250 |
| 1 | 6 | 3 | 4-1/2 | 250-300 |
| 1 | 9 | 4 | 4-1/2 | 250-300 |
| 1 | 12 | 4 | 4-1/2 | 250-300 |
| 1-1/4 | 9 | 4 | 5-1/2 | 400-450 |
| 1-1/4 | 12 | 4 | 5-1/2 | 400-450 |
Materials
- Carbon steel, zinc-plated (dry interior)
- Carbon steel, hot-dip galvanized (exposed)
- Stainless steel (corrosive or wash-down environments)
Ordering & documentation
Documents
Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.
Quotation
- The fastener family (Wedge Anchors (Torque-Controlled Expansion)) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
- Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
- Quantity per size and your target delivery date.
- Destination country, and any required documents (for example a mill test certificate) so the quote includes them.
Sample & supply
Minimum order quantity is 500–1,000 pieces. Standard production run 15–30 days. Quantities or variants outside the standard range are confirmed at quotation.
Storage & shipping
Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.
Frequently asked questions
When does a wedge anchor beat a concrete screw anchor?
When the load is higher, the diameter range must extend past what screw anchors cover (M6–M16 vs M6–M24 in the family bands), or the seismic detail already references a qualified expansion system. Both install fast and load immediately; the wedge adds a torque pass and buys higher, more widely qualified capacity. For the lightest repetitive fixings the screw anchor stays cheaper per hole.
Why is hole tolerance called out as the governing risk?
The expansion mechanism converts nut torque into wedge pressure against the hole wall, so the clamp load is a function of hole-diameter tolerance and applied torque. An oversize hole — a worn bit, a reamed hole — means the wedge cannot develop pressure; an under-cleaned hole means the dust layer pads it. Both failure modes leave the anchor loose before any load arrives, which is why the installation specification should name the drill diameter, the torque value and the cleaning method, and why qualification testing (ACI 355.2, EAD 330232) runs with those variables controlled.
What is the MOQ and lead time for these anchors?
The minimum order quantity is 500–1,000 pieces. Standard production runs 15–30 days. Bent or custom geometries are quoted against the drawing.
What should an RFQ for these anchors state?
State the anchor family and designation, diameter, embedment or length, base-material condition (cracked or uncracked concrete, moisture), coating, and quantity per size — plus destination country and any required documents such as a mill test certificate. If your detail carries an ETA or ICC-ES report number, quote it so the anchor matches the approval.
Request a Quote
Get factory-direct pricing from the manufacturer.
What to include in your inquiry
- ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
- ✓ Sizes, lengths and thread type (metric or inch).
- ✓ Quantity per size and your target delivery date.
- ✓ Destination country, plus any coating or finish requirement.
- ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
- ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
- ✓ Factory-direct pricing
- ✓ Standard and custom specifications
- ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
- ✓ Full fastener family support