Elevator Screw Anchor Bolt | Under-Cut Expansion Anchor | Factory Direct Supply

The main load-bearing components use 8.8/10.9 grade high-strength carbon steel Elevator Screw, with post-installed undercut mechanical anchors preferred for anchoring; 304/316 stainless steel is selected for humid/corrosive environments.

Performance Class	Tensile Strength (MPa)	Yield Strength (MPa)	Applicable Scenarios
4.6 grade	400	240	Non-load-bearing auxiliary connections (e.g., decorative parts)
8.8 grade	800	640	Standard elevator traction machine, guide rails, and truss fixing
10.9 grade	1000	900	High-speed elevators (>2 m/s), heavy loads, and high-frequency vibration scenarios.
304 stainless steel	520	205	Non-load-bearing components for humid / coastal / corrosive environments
316 stainless steel	570	270	Highly corrosive environments (chemical industry, coastal areas)

 High-Strength Bolts (Connecting Components)

Type: Hex head high-strength bolts, Torsional shear type high-strength bolts Core applications: Traction machines, guide rails, elevator cars, counterweight frames, main load-bearing connections of trusses Selection points: 8.8 grade suitable for conventional elevators; 10.9 grade for high-speed/heavy-duty/large-tonnage applications; matching nuts and washers of the same grade are required, and anti-loosening measures are necessary (double nuts/locking adhesive).

Undercut mechanical anchor bolt (post-installed anchoring system)

Core advantages: Mechanical locking mechanism, high tensile and shear strength, resistant to temperature and humidity, design life of ≥50 years, superior to ordinary expansion anchor bolts. Applicable scenarios: Elevator foundations, post-anchoring of shaft structures, and fixing of elevator installation nodes, must comply with GB 50367. Specification recommendations: Nominal diameter of load-bearing structure ≥M12, anchoring depth ≥60mm, on-site pull-out testing is required.

Standard bolts (non-load-bearing, auxiliary)

Grade: 4.6 grade (Q235 material) Applications: Elevator decoration, non-load-bearing brackets, and fixing of lightweight accessories.

Stainless steel bolts (for corrosive environments)

Material: 304/316 Stainless Steel Applications: Elevator shafts in damp areas, coastal projects, and corrosive environments.