Rock Bolts
Overview
Rock bolts are support members in geotechnical engineering that anchor rock masses and transfer loads, widely used in tunnels, mines, slopes, and other scenarios to maintain surrounding rock stability and ensure engineering safety.
Left-hand Threaded Rock Bolt — Rib-free
Model: MG335 / MG400 / MG500
Common names: Left-hand rock bolt; rib-free rock bolt
Key specifications
Diameter (mm): Φ16–Φ25 (custom diameters available)
Length (mm): Custom lengths to project requirements
Material: Threaded steel (inferred from full-length equal-strength characteristic)
Manufacture: Full-length rolled continuous thread
Features & benefits
Continuous, full-length rolled thread providing uniform strength and high material efficiency.
Rapid installation with pre-tensioning washers and spherical nut options for controlled pre-stress application.
Material-saving and flexible anchoring options — end anchoring, extension anchors, and full anchors — enabling tailored support schemes.
Particularly suited to roadway and tunnel face reinforcement where installation speed and pre-stressing are required.
Typical uses: Mine roadways, underground support for tunneling and civil works, railway and hydropower tunnel support.
Right-hand Threaded Rock Bolt — Equal-strength Threaded Steel
Model: MG335 / MG400 / MG500
Common names: Right-hand rock bolt; equal-strength threaded steel rock bolt
Key specifications
Diameter (mm): Φ16, Φ18, Φ20, Φ22
Length (mm): 1200, 1500, 1800, 2000 (custom lengths available)
Material: Threaded steel, full-length equal strength (rolled continuous thread)
Strength grade: MG335 (other grades available depending on model)
Features & benefits
Full-length threaded rod with uniform axial strength—high material utilization and predictable performance.
High anchoring capacity with straightforward installation and low equipment requirements.
Durable and wear-resistant; minimizes damage to surrounding ground and structures.
Cost-effective solution for general-purpose roadway and tunnel support.
Typical uses: Coal mines, tunnels, transport tunnels, and general underground support.
GRP (Glass-Reinforced Plastic) Rock Bolt
Model / marking: Unmarked (custom labeling available)
Key specifications
Diameter (mm): Φ16, Φ20, Φ25, Φ32 (custom diameters available)
Length (mm): 1000–3000 (custom lengths available)
Material: High-strength glass fiber embedded in engineered resin matrix (specially compounded and cured); full-thread profile available
Unit: sold by meter (m)
Export: Suitable for cross-border export supply
Features & benefits
Lightweight — approximately 1/4 the mass of equivalent steel bolts — reducing handling and transport costs.
Excellent corrosion resistance and chemical stability; suitable for permanent support in aggressive environments.
Non-sparking and easy to cut on site — improves safety around cutting equipment and reduces risk in coal mining applications.
High strength-to-weight ratio and low lifetime maintenance costs; applicable across a wide range of geotechnical projects.
Typical uses: Coal mine roadways, mine works, rail/highway slope stabilization, underground works, tunnel rock reinforcement.
Typical specifications
Right-hand threaded rock bolt: MG335 / MG400 / MG500 — Φ16 / Φ18 / Φ20 / Φ22 mm — 1200 / 1500 / 1800 / 2000 mm (custom)
GRP rock bolt: Φ16 / Φ20 / Φ25 / Φ32 mm — 1000–3000 mm (custom) — sold per meter — export supply available
Left-hand threaded rock bolt: MG335 / MG400 / MG500 — Φ16–Φ25 mm (custom) — lengths to project requirement
Why choose our rock bolts？
Strict material and process control to ensure full-length uniform strength and consistent performance.
Customizable diameters, lengths and anchoring options to match site-specific requirements.
Export capability for FRP products and capacity to supply full accessory kits.
Competitive pricing, ease of installation and solutions that reduce construction risk and long-term maintenance.
FAQs
Q:What types of rock bolts do you supply?
A:We supply right-hand threaded steel bolts (equal-strength, MG series), left-hand threaded rib-free steel bolts, and GRP/FRP bolts. Accessories and pre-tensioning options are also available.
Q: What does “full-length equal strength” mean?
A:It indicates the bolt has a rolled or formed continuous thread over its effective length such that the axial strength is uniform, avoiding weak zones and ensuring predictable anchoring performance.
Q: When should I choose GRP/FRP over steel?
A:Choose GRP when low weight, corrosion resistance and non-sparking cutting are priorities—e.g., corrosive environments, permanent support requirements or safety-sensitive mining operations.