China Best Sales High Strength Fiberglass FRP Material Threaded Anchor Bolt for Underground with high quality

Product Description

Quick Details
Place of Origin: China (Mainland)                             Brand Name: XIHU (WEST LAKE) DIS.
Type: Solid/ hollow / self drilling                              Product Name: FRP Rebar
Name: High Modulus CZPT frp rebar                       Category: hollow grouting or solid anchor bolt
Application: Construction , Coal Mine, Tunnel, Metro, slope, foundation pit, etc.
Model Number: FRP glass full screw resin bolt                  Technique: Pultrusion winding
Surface treatment: Thread ,Anti-static/ sand-coated /customize      Feature: Light Weight
Dimensions: 4-55mm /customizable                           Material: Fiberglass &Resin
Chemical compositon: Fiberglass & unsaturated resin / expoxy      Rod density: 1.6 – 2.1g / m³
Color: Black\white\yellow\red\green Blue\Grey or Customized      Length: 1-12M or Customized
Thread: Left or Right Customized                              Ultimate Strain: 2%
Supply Ability: 3000 Meter/Meters per Day                      Anti static: 3*10000000 Ω
Tensile strength: >600MPa                                    E-modulus: 40GPa .
Shear strength: 150MPa                                      Certificate: ISO9001-2000,GB/T19001-2008
Fiberglass Rebar adopt glass fiber as reinforced materials and  polyester resin as basic materials, through Pulled by specific traction machine, be solidified glass fiber reinforced plastic rod body with full thread under high pressure and high temperature by preformed matched die . It is made up of fiberglass anchor rod plus resin anchoring agent, tray and nut.
The Solid Bolt is used in Mining, Tunneling and Civil Engineering widely. It provides more possibilities as an alternative to metal. The GFRP Solid Bolt is manufactured with high quality GFRP material(Glassfiber Reinforced Polymer). The GFRP Solid Bolt have a high tensile load and bearing capacity with accessories, but the weight is only 1 quarter of metal product.
Fiber glass rebar, FRP rebar, GFRP rebar, CZPT rebar,reinforcing bar with diameter from 4mm to 55mm.manufactures CZPT Rebars by combining the pultrusion process and an in-line winding & coating process for the outside sand surface.  As compared to con-ventional steel rebars, CZPT rebars should be a suitable alternative to steel reinforcing in:
 ·Architectural Concrete: cast stone, architectural cladding, balusters, column facades, window lentils, architectural precast elements, hand railing, and statuary and fountains, etc.
 ·Concrete exposed to de-icing salts in: bridge decks, railroad grade crossings, median barriers, parking garage elements, and salt storage facilities, etc.
 Concrete exposed to marine salts in: seawalls, water breaks, buildings & structures near waterfront, CZPT operations, and floating marine docks, etc.
 ·Applications Subjected to Other Corrosive Agents: Wastewater treatment plants; petrochemical plants; pulp/paper mills; liquid gas plants; pipelines / tanks for fossil fuel; cooling towers; chimneys; mining operations of various types; nuclear power and dump plants.
 ·Applications Requiring Low Electric Conductivity or Electromagnetic Neutrality: Aluminum and copper smelting plants; manholes for electrical and telephone communication equipment; bases for transmission / telecommunication towers; airport control towers; magnetic resonance imaging in hospitals; railroad crossing sites, and specialized military structures.
 ·Tunneling / Boring Applications Requiring Reinforcement of Temporary Concrete Structures: Structures including mining walls; underground rapid transit structures and underground vertical shafts. 
 ·Weight Sensitive Structures: Concrete construction in areas of poor load bearing soil conditions, remote geographical locations, sensitive environmental areas, or active seismic sites posing special issues that the use of lightweight reinforcement will solve. 
 ·Thermally Sensitive Applications: Apartment patio decks; thermally insulated concrete housing and basements; thermally heated floors and conditioning rooms.  
1. Mining support
2. Face bolting
3. Soil nail
4. Slope stabilization
5. Permanent application
6. Temporary support
7. Subway tunnel
8. Building construction
9. Seawall damming
10. Rock supporting
11. foundation pit wall
12. Port of foundation pit
13. Roadway support
14.Tunnel construction, etc.
1. All-thread (stronger bonding with the grouting material)
2. Low weight (1/4 weight of steel anchor bolt)
3. High durability ( unaffeced by acid rain, salt water, and most chemicals)
4. Strong adhesion and anchorage force
5. High corrosion resistance , anti-static, High rotproofness
6. High torque resistance
7. 100+ years service life
8. Easy handling due to low weight
9. Fire retardant
10. Impact resistant
11. Nonconductive and thermal insulation
12. Non-magnetic electromagnetic transparency
13. Dimensional stability, Bright color
14. Low-maintenance
15. Cuttability, easy cutting
16. High torsion resistance
17. Anti-static coating (optionally)
18. Long service life
19. High tensile load
20. Deformation patterns are the same as with steel
21. Coefficient of thermal expansion more similar to concrete than that of steel
22. Direct production costs lower than similar steel bolt
23. Strongly adapt to the environment, and no emmiting the electromagnetic wave
FRP Rebar Other Features:
Non-flammable:  It is non-flammable and has high thermal insulation;
Cutability  :  It avoids damages to cutter heads, and does not delay excavation
Save cost : Use this material as reinforcing bars for road and bridge, could reduce Secondary repair cost.
 Accessory products
 1. Anchor bolt : the important construction of the assembly, plays a major role in the anchor and
2. The head of the anchor drill: barb can be bolt positioning in the drilled holes, the middle rod body
3. Coupling: easy to manage, unlimited application range.
4. Anchor plate : bear greater stress of surrounding rock.
5. Nut: the surrounding rock stress concentrated on the pad.
6. GFRP Plate, GFRP Nut , GFRP Coupler, Anchor Drill Bit, steel Nut, Steel coupler, steel plate, other types are available as requested
7. Rebar : the important construction of the assembly, plays a major role in the anchor and support.
8. The head of the anchor drill: barb can be bolt positioning in the drilled holes, the middle rod body good.
9. Coupling: easy to manage, unlimited application range.
10. Anchor plate : bear greater stress of surrounding rock.
11. Nut: the surrounding rock stress concentrated on the pad.
Glass reinforced plastic anchor rod with circular arc tooth profile FRP nut thread suit, 
glass fiber reinforced plastic nut near 1 end of the glass fiber reinforced plastic pallet 
stretch narrow neck formation, glass fiber reinforced plastic tray set it on the neck of the glass fiber reinforced plastic nut, glass reinforced plastic anchor rod in the middle of the paragraph to the polished rod structure. The utility model tensile, shear and torsion strength is strong, the production cost is low,  the supporting effect is good, can be applied to all have the special circumstances of flammable and explosive.

Technical Data

FRP Rock Bolt Test Unit MGSL18 NGSL20 MGSL22 MGSL24 MGSL27
Rod Surface Uniform appearance, no bubble and flaw
Nominal Diameter/mm 18 20 22 24 27
Tensile load/KN 160 210 250 280 350
Tensile Strength/MPa 600 600 600 600 600
Shearing strength/MPa 150 150 150 150 150
Torsion/Nm 45 70 100 150 200
Antistatic 3*107 3*107 3*107 3*107 3*107
Flame Resistance
s ≤6 ≤6 ≤6 ≤6 ≤6
s ≤2 ≤2 ≤2 ≤2 ≤2
Flaming burning
s ≤60 ≤60 ≤60 ≤60 ≤60
s ≤12 ≤12 ≤12 ≤12 ≤12
Plate Plate load strength/kN 70 80 90 100 110
Central diameter/mm 28±1 28±1 28±1 28±1 28±1
Nut Nut load strength/kN 70 80 90 100 110

FRP bolts/Fiber reinforced plastics bolts/GFRP Anchor Rock Bolts Parameter

Unit   Hollow Rock bolt Self-drilling Rock bolt
Diameter mm 12/25 12/28 32/15 12/25 12/28 32/15
External mm 25 28 32 25 28 32
cross section mm^2 345 450 563 345 450 563
Thread distance mm 10 10 10 12.7 12.7 12.7
Thread direction   right right right left left left
Tensile Load kN 230 300 380 250 330 400
Tensile strength Mpa 650 650 650 650 650 650
Torsion Nm 80 110 200 120 200 250
Shear strength MPa 150 150 150 150 150 150
Elongation % 2.5 2.5 2.5 2.5 2.5 2.5
E-modulus Gpa 40 40 40 40 40 40
weight g/m 642 896 1156 642 896 1156

FRP rock bolt equipment
1. Productive technology: full thread FRP rock bolt body once molding
2. Production speed: fast speed, can produce ≥1.5 M per minute
3. Rod body torsion: big torsion, different rod body the torsion can be as high as 60NM-160NM
4. Rod body and nut cooperate closely, the coverall performance is good
5. Big bearing capacity, tray and nut is patented product, the maximum bearing capacity can reach more than 150KN
6. Long production time: it can continuously all day long production, trouble-free
7. Formula science, save material, the product quality is stable
8. Equipment performance in the domestic similar products leading level, simple operation, easy to control, lifelong technical
Method of application for FRP rock bolt
After the roofbolter finished drilling, remove the drill pipe, make the six-party of rock bolt installation machine insert jumbolter drill pipe connection, then make the lever genus part of compression nut insert the rock bolt installation machine, make anchoring agent into the rock bolt holes, then use the rock bolt bracing anchoring agent, at this time do propulsion leg movement, drilling machine motor not rotating, anchoring agent will be sent to the bottom of the hole, at this point to start drilling machine motor rotating, rotating rock bolt to stir anchoring agent, when the FRP rock bolt reached the bottom of the hole, stop the machine, drilling machine fast rotating to stirring anchoring agent, stirring time is set time of anchoring agent (usually 10 s ~ 15 s ), close the drilling machine, stop rotating, according to the anchoring agent curing time, general stop 30 s ~ 45 s, after anchoring agent curing, ant then make drilling machine to start rotating, screw up the nut for bottom of rock bolt, at this time drilling machine motor stop rotating, rock bolt install end
Safety matters need attention
1. When installation the rock bolt, not allowed holding the rock bolt, lest produce an accident
2. Finished the rock bolt, when the drilling machine drops, can’t make the hand on the gas leg, prevent hurting hands
3. When use the jumbolter to installation tray and nut, must master the use of the drilling machine and anchoring agent, when install the nut must immediately stop the machine, otherwise it will damage FRP bolt
4. Please use the resin bolt anchoring agent that complies with safety srandards
5. Transportation store
6. In the process of product transportation shall not be cast and throw.
7. The rod body should be stored in a cool and dry place, rod body storage time no more than 1 year.
8. End of the anchoring can not contaminated with oil, rod body tail thread shall not damage
Technical parameters of the product

Pallet dimension
Standard value of tensile strength(MPa) Ultimate load of the bolt
Bearing capacity of end connection and whorl (KN) Bolt torque
16 1200~1800 120×120×6 ≥300 80 ≥50 ≥40
18 1200~2000 120×120×10 ≥300 100 ≥60 ≥40
20 1200~3000 140x140x8
≥300 120 ≥70 ≥40
22 1600~3000 150×150×10
170x 170x 10
≥300 140 ≥80 ≥40
24 1800~3000 150×150×10 ≥300 160 ≥90 ≥40

   Hollow grouting bolt characteristics
 1. The function of bolt and grouting pipe is combined, when grouting, it is grouting pipe, after grouting,
    no need to dial out to become a bolt.
2. The hollow design enables the anchor rod to realize the grouting pipe function, avoids the mortar
    loss which the traditional construction craft pipe grouting causes.
3. Grouting full, and can realize the pressure grouting, improve the quality of the project.
4. Because of the role of accessories, the middle of the rod is very good, mortar can anchor the whole
    body wrapped, to avoid the risk of corrosion, to achieve long-term support purposes.
5. Convenient installation, without on-site processing of thread, you can easily install the plate, nut.
6. Combined with the special bolt grouting pump and grouting technology, it is the anchor system
    which has solved many problems of traditional anchor support at home.
Technical Index of Fiberglass Rebar

Diameter(mm) Cross Section(mm2) Density(g/cm3) Weight(g/m) Ultimate Tensile Strength(MPa) Elastic Modulus(GPa)
3 7 2.2 18 1900 >40
4 12 2.2 32 1500 >40
6 28 2.2 51 1280 >40
8 50 2.2 98 1080 >40
10 73 2.2 150 980 >40
12 103 2.1 210 870 >40
14 134 2.1 275 764 >40
16 180 2.1 388 752 >40
18 248 2.1 485 744 >40
20 278 2.1 570 716 >40
22 355 2.1 700 695 >40
25 478 2.1 970 675 >40
28 590 2.1 1195 702 >40
30 671 2.1 1350 637 >40
32 740 2.1 1520 626 >40
34 857 2.1 1800 595 >40
36 961 2.1 2044 575 >40
40 1190 2.1 2380 509 >40

Technique chart:


Packaging & Delivery
Packaging: Bundle with pallet, Bolts packed in bundles and accessories packed in cartons.
Packed with steel wires or other way as customers requirement.
Delivery Time: within 20 days
Lead Time ::within 20 days
Our Services
    As 1 of the leading suppliers of pultrusion fiberglass reinforced polymer CZPT products, we can provide you FRP tubes, Channel, I-beam, angle, Rebar, rods,Garden stakes, gratings. 
     Customized shape service is available from us, just send us CAD drawing or contact us direatly.  For moulds, TT 100% before making; for products, TT 30% in advance, 70% balance payment on receiving bill of lading by Email or before delivery.
    Researches and development team by knowing the importance of the FRP usage in industry and construction , have successfully conducting different researches and studies projects.
Design and engineering services has been given idea from customers, and make out the thing you imaged. Specially developing on new machinary. 
Istallation and construction team is experienced with installation, commissioning and training service at cutomer’s factory. In this way, the customer is CZPT to handle management of equipment themsleves soon. 
Mantiance service is applied when customer cann’t solve problem themselves. Mainly at equipment, software, tools…etc.
Technical support is the most importance in production. as long as frp developing, new and advanced process, material, equipments appeared. We are  giving the eyes on the world frp relatived news and supply customer advanced service.
Q: Are you a trading company or factory?
A: our factory is a FRP manufacturer in China.
Q: Can you factory customize the machine for clients?
A: yes, we can. 
Q: what are you payment terms?
A: Normally, 50% as the deposit first by T/T, the rest 50% will be paid before shipping by T/T.
Q: How about after-sales service?
A: 1 year free warranty, Lifetime technical service support.
Please Contact Us
 Miss: lydia


What Are Screw Shaft Threads?

A screw shaft is a threaded part used to fasten other components. The threads on a screw shaft are often described by their Coefficient of Friction, which describes how much friction is present between the mating surfaces. This article discusses these characteristics as well as the Material and Helix angle. You’ll have a better understanding of your screw shaft’s threads after reading this article. Here are some examples. Once you understand these details, you’ll be able to select the best screw nut for your needs.

Coefficient of friction between the mating surfaces of a nut and a screw shaft

There are 2 types of friction coefficients. Dynamic friction and static friction. The latter refers to the amount of friction a nut has to resist an opposing motion. In addition to the material strength, a higher coefficient of friction can cause stick-slip. This can lead to intermittent running behavior and loud squeaking. Stick-slip may lead to a malfunctioning plain bearing. Rough shafts can be used to improve this condition.
The 2 types of friction coefficients are related to the applied force. When applying force, the applied force must equal the nut’s pitch diameter. When the screw shaft is tightened, the force may be removed. In the case of a loosening clamp, the applied force is smaller than the bolt’s pitch diameter. Therefore, the higher the property class of the bolt, the lower the coefficient of friction.
In most cases, the screwface coefficient of friction is lower than the nut face. This is because of zinc plating on the joint surface. Moreover, power screws are commonly used in the aerospace industry. Whether or not they are power screws, they are typically made of carbon steel, alloy steel, or stainless steel. They are often used in conjunction with bronze or plastic nuts, which are preferred in higher-duty applications. These screws often require no holding brakes and are extremely easy to use in many applications.
The coefficient of friction between the mating surfaces of t-screws is highly dependent on the material of the screw and the nut. For example, screws with internal lubricated plastic nuts use bearing-grade bronze nuts. These nuts are usually used on carbon steel screws, but can be used with stainless steel screws. In addition to this, they are easy to clean.

Helix angle

In most applications, the helix angle of a screw shaft is an important factor for torque calculation. There are 2 types of helix angle: right and left hand. The right hand screw is usually smaller than the left hand one. The left hand screw is larger than the right hand screw. However, there are some exceptions to the rule. A left hand screw may have a greater helix angle than a right hand screw.
A screw’s helix angle is the angle formed by the helix and the axial line. Although the helix angle is not usually changed, it can have a significant effect on the processing of the screw and the amount of material conveyed. These changes are more common in 2 stage and special mixing screws, and metering screws. These measurements are crucial for determining the helix angle. In most cases, the lead angle is the correct angle when the screw shaft has the right helix angle.
High helix screws have large leads, sometimes up to 6 times the screw diameter. These screws reduce the screw diameter, mass, and inertia, allowing for higher speed and precision. High helix screws are also low-rotation, so they minimize vibrations and audible noises. But the right helix angle is important in any application. You must carefully choose the right type of screw for the job at hand.
If you choose a screw gear that has a helix angle other than parallel, you should select a thrust bearing with a correspondingly large center distance. In the case of a screw gear, a 45-degree helix angle is most common. A helix angle greater than zero degrees is also acceptable. Mixing up helix angles is beneficial because it allows for a variety of center distances and unique applications.

Thread angle

The thread angle of a screw shaft is measured from the base of the head of the screw to the top of the screw’s thread. In America, the standard screw thread angle is 60 degrees. The standard thread angle was not widely adopted until the early twentieth century. A committee was established by the Franklin Institute in 1864 to study screw threads. The committee recommended the Sellers thread, which was modified into the United States Standard Thread. The standardized thread was adopted by the United States Navy in 1868 and was recommended for construction by the Master Car Builders’ Association in 1871.
Generally speaking, the major diameter of a screw’s threads is the outside diameter. The major diameter of a nut is not directly measured, but can be determined with go/no-go gauges. It is necessary to understand the major and minor diameters in relation to each other in order to determine a screw’s thread angle. Once this is known, the next step is to determine how much of a pitch is necessary to ensure a screw’s proper function.
Helix angle and thread angle are 2 different types of angles that affect screw efficiency. For a lead screw, the helix angle is the angle between the helix of the thread and the line perpendicular to the axis of rotation. A lead screw has a greater helix angle than a helical one, but has higher frictional losses. A high-quality lead screw requires a higher torque to rotate. Thread angle and lead angle are complementary angles, but each screw has its own specific advantages.
Screw pitch and TPI have little to do with tolerances, craftsmanship, quality, or cost, but rather the size of a screw’s thread relative to its diameter. Compared to a standard screw, the fine and coarse threads are easier to tighten. The coarser thread is deeper, which results in lower torques. If a screw fails because of torsional shear, it is likely to be a result of a small minor diameter.


Screws have a variety of different sizes, shapes, and materials. They are typically machined on CNC machines and lathes. Each type is used for different purposes. The size and material of a screw shaft are influenced by how it will be used. The following sections give an overview of the main types of screw shafts. Each 1 is designed to perform a specific function. If you have questions about a specific type, contact your local machine shop.
Lead screws are cheaper than ball screws and are used in light-duty, intermittent applications. Lead screws, however, have poor efficiency and are not recommended for continuous power transmission. But, they are effective in vertical applications and are more compact. Lead screws are typically used as a kinematic pair with a ball screw. Some types of lead screws also have self-locking properties. Because they have a low coefficient of friction, they have a compact design and very few parts.
Screws are made of a variety of metals and alloys. Steel is an economical and durable material, but there are also alloy steel and stainless steel types. Bronze nuts are the most common and are often used in higher-duty applications. Plastic nuts provide low-friction, which helps reduce the drive torques. Stainless steel screws are also used in high-performance applications, and may be made of titanium. The materials used to create screw shafts vary, but they all have their specific functions.
Screws are used in a wide range of applications, from industrial and consumer products to transportation equipment. They are used in many different industries, and the materials they’re made of can determine their life. The life of a screw depends on the load that it bears, the design of its internal structure, lubrication, and machining processes. When choosing screw assemblies, look for a screw made from the highest quality steels possible. Usually, the materials are very clean, so they’re a great choice for a screw. However, the presence of imperfections may cause a normal fatigue failure.

Self-locking features

Screws are known to be self-locking by nature. The mechanism for this feature is based on several factors, such as the pitch angle of the threads, material pairing, lubrication, and heating. This feature is only possible if the shaft is subjected to conditions that are not likely to cause the threads to loosen on their own. The self-locking ability of a screw depends on several factors, including the pitch angle of the thread flank and the coefficient of sliding friction between the 2 materials.
One of the most common uses of screws is in a screw top container lid, corkscrew, threaded pipe joint, vise, C-clamp, and screw jack. Other applications of screw shafts include transferring power, but these are often intermittent and low-power operations. Screws are also used to move material in Archimedes’ screw, auger earth drill, screw conveyor, and micrometer.
A common self-locking feature for a screw is the presence of a lead screw. A screw with a low PV value is safe to operate, but a screw with high PV will need a lower rotation speed. Another example is a self-locking screw that does not require lubrication. The PV value is also dependent on the material of the screw’s construction, as well as its lubrication conditions. Finally, a screw’s end fixity – the way the screw is supported – affects the performance and efficiency of a screw.
Lead screws are less expensive and easier to manufacture. They are a good choice for light-weight and intermittent applications. These screws also have self-locking capabilities. They can be self-tightened and require less torque for driving than other types. The advantage of lead screws is their small size and minimal number of parts. They are highly efficient in vertical and intermittent applications. They are not as accurate as lead screws and often have backlash, which is caused by insufficient threads.

China Best Sales High Strength Fiberglass FRP Material Threaded Anchor Bolt for Underground   with high qualityChina Best Sales High Strength Fiberglass FRP Material Threaded Anchor Bolt for Underground   with high quality