Undercut Anchor

Undercut Anchor — High-Security Post-Installed Anchor with Mechanical Interlock | ETA Certified

Undercut anchors provide the highest level of safety for post-installed anchor applications. Unlike expansion anchors that rely on friction, undercut anchors create a positive mechanical interlock by undercutting the base material. This delivers superior performance in cracked concrete, seismic zones, and critical load applications. ETA (European Technical Assessment) certified for safety-critical installations.

Material & Specifications

Size Range	M8 to M30 / 5/16″ to 1-1/4″
Material	Carbon Steel (Grade 8.8, 10.9), 316 Stainless Steel (A4), High-Corrosion Resistant Steel (HCR)
Surface / Coating	Zinc Plated, Hot-Dip Galvanized, Sherardized, Stainless Steel
Standard	ETAG 001, ETA Certified, DIN, ISO 898

Key Features

• Mechanical interlock – not friction-based, zero slip
• Suitable for cracked and uncracked concrete
• Seismic performance categories C1 and C2 available
• Fire-resistant design up to F120 rated

Applications

• Nuclear power plant structural connections
• Tunnel lining and underground construction
• High-rise building curtain wall anchoring
• Bridge bearing and seismic restraint systems

Why Choose BoltNutsPlus?

• ISO 9001:2015 Certified Manufacturing — consistent quality you can trust
• 15+ Years of Export Experience — serving 40+ countries worldwide
• Full Traceability — material certificates and test reports included
• Custom Packaging & OEM/ODM — your brand, your specifications
• Third-Party SGS / Bureau Veritas Inspection Available
• 24-Hour Quote Response — same-day reply for urgent requirements