1.Technical Specifications
| Item | Specification |
| Product Name | Flat Bearing Plate / Mining Roof Bolt Plate |
| Steel Grade | HSLA 65 |
| Yield Strength min | 65,000 psi / 275 MPa |
| Tensile Strength max | 95,000 psi / 655 MPa |
| Elongation | 25% |
| Standard Size Range | 4 x 4 inch to 8 x 8 inch |
| Hole Diameter | 1/2 inch – 2 inch |
| Standard Reference | ASTM F432-13 |
| Application | Mining roof support, tunnel support, ground anchoring |
2. Grade and Load Data
| Thickness inch | ASTM F432-13 Grade | Hole Diameter inch | Deflection Load at 0.250 inch lb |
| 0.16 | 2 | 1/2″ – 2″ | 20,000 |
| 1/4 | 3 | 1/2″ – 2″ | 30,000 |
| 1/4 | 4 | 1/2″ – 2″ | 40,000 |
| 5/16 | 5 | 1/2″ – 2″ | 50,000 |
| 3/8 | 6 | 1/2″ – 2″ | 60,000 |
| 1/2 | 7 | 1/2″ – 2″ | 70,000 |
3. Applications
Flat bearing plates are commonly used in mining and underground support applications that require stable load transfer and rock/roof control. Examples of these applications include but are not limited to:
4. Advantages
Flat bearing plates are used to help distribute the load of the bolt head or nut to a larger surface area. This helps reduce pressure points on the rock surface and can increase the performance of your support system. Compared to standard washers, flat bearing plates offer a larger surface area for contact and better support capabilities. They are ideal for roof bolting systems used in underground mines, tunnels and other ground support applications.
5. Custom Options
We can supply flat bearing plates according to customer drawings and project requirements.
Available customization includes:
6. FAQ
6.1 What is a Flat Bearing Plate used for?
Flat bearing plates are typically used along with roof bolts, rock bolts or anchor bolts. They help distribute load and increase support in mines, tunnels and underground construction.
6.2 What kind of material is used for flat bearing plates?
Flat bearing plates can be made from a variety of different materials but are commonly made from high strength steel like HSLA 65.
6.3 What sizes are available?
We offer flat bearing plates ranging from 4″ x 4″ to 8″ x 8″. Custom sizes can also be made to order based on your engineering drawings.
6.4 What hole diameter options are available?
Bolt hole diameters can range from 1/2″ to 2″. The diameter of the hole will depend on your application and what size bolt you will be using.
6.5 Can flat bearing plates be custom made?
Yes. We offer custom flat plate sizes, thickness, hole diameter, material grade, surface finishing and packaging.
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We deliver complete support for underground reinforcement applications, covering: Mining roof and sidewall support systems Tunnel reinforcement solutions Slope stabilization engineering support Foundation anchoring systems Underground safety structural systems From early-stage project planning to on-site application, we help customers build safer and more stable underground environments.
Wanfeng provides a fully integrated product supply system, enabling customers to source all ground support materials from one supplier: Rock bolt systems (resin / FRP / threaded) Cable bolts & anchoring systems Steel arches & I-steel support systems Wire mesh & reinforcement mesh Plates, nuts, bolts & fastening components Resin & cement anchoring materials Mining tools & consumable accessories Our one-stop supply capability reduces procurement complexity and improves project efficiency.
We ensure stable and reliable product performance through strict manufacturing and quality control systems: Standardized production processes Raw material inspection and control Mechanical performance testing Load-bearing and tensile strength verification Batch consistency inspection Final quality inspection before shipment Every product is engineered to meet demanding underground safety requirements.
We also support customized solutions for different mining and engineering projects: Customized rock bolt specifications Non-standard steel support design Special mesh and reinforcement structures Project-based product configuration OEM / private label cooperation We work closely with global partners to develop tailored solutions for complex underground environments.
With strong export experience, we provide efficient global delivery and supply chain support: International export packaging standards Container loading optimization Multi-region shipping support Fast production scheduling for urgent projects Stable long-term supply agreements We ensure reliable delivery to mining projects across different countries and regions.
We support customers throughout the entire project lifecycle: Technical documentation support Installation guidance assistance Product replacement support Long-term supply continuity Engineering consultation for project expansion Our goal is to build long-term partnerships, not just single transactions.
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