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Hollow Rock Bolt Factory

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Hollow Grouting Anchor Rod Hollow Grouting Rock Bolt Hollow Anchor Bar Rock Anchor Bolt Hollow Grouting Anchor Bolt

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Hot Sale R32 R38 T76 40cr Hollow Grouted Self Drilling Rock Anchor Bolt From China Factory

Hot Sale R32 R38 T76 40cr Hollow Grouted Self Drilling Rock Anchor Bolt From China Factory

US $ 1.5-3 / Piece FOB
100 Pieces (MOQ)
More
Main Products: Rock Bolt, Resin Capsule, FRP Anchors, U-Shaped Steel Support, Welded Wire Mesh, Cable Bolt Strand, Drill Bit, Drill Pipe, Split Set Anchor Bolt, Hollow Grout Rock Bolt
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Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
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Factory Direct Selling Solid and Hollow Self Drilling Anchor Bolts Rock Bolts

Factory Direct Selling Solid and Hollow Self Drilling Anchor Bolts Rock Bolts

US $ 1.55-5.58 / Piece FOB
100 Pieces (MOQ)
More
Standard : GB
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
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Hollow Bar Factory Price Thread Rods Hollow Grouting Rock Bolts Micropile Tunnel Bolting

Hollow Bar Factory Price Thread Rods Hollow Grouting Rock Bolts Micropile Tunnel Bolting

US $ 1.5-3 / Piece FOB
100 Pieces (MOQ)
More
Main Products: Rock Bolt, Resin Capsule, FRP Anchors, U-Shaped Steel Support, Welded Wire Mesh, Cable Bolt Strand, Drill Bit, Drill Pipe, Split Set Anchor Bolt, Hollow Grout Rock Bolt
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Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
Chat Now Send Inquiry
High Quality Factory Direct Alloy ISO Certification R25/R32/R38/R51/T76 Steel Grade Hollow Bolts Rock Bolts Hollow Grouting Anchor Rod

High Quality Factory Direct Alloy ISO Certification R25/R32/R38/R51/T76 Steel Grade Hollow Bolts Rock Bolts Hollow Grouting Anchor Rod

US $ 850-900 / Ton FOB
1 Ton (MOQ)
More
Standard : AISI, ASME, ANSI, JIS, GB
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Audited Supplier Audited Supplier Since 2021
Liaocheng Xinruyi Trading Co., LTD.

Manufacturer/Factory

Shandong, China Since 2021
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China Export Factory Hot-DIP Galvanized Hollow Grouted Self-Propelled Rock Bolt/Anchor Bar/ Anchor Bolts

China Export Factory Hot-DIP Galvanized Hollow Grouted Self-Propelled Rock Bolt/Anchor Bar/ Anchor Bolts

US $ 850-900 / Ton FOB
1 Ton (MOQ)
More
Main Products: Seamless Steel Pipe, Stainless Steel Round Bars, Cold Drawn Steel Bars, Rock Bolt, Self Drilling Anchor Bolts, Hydraulic Structure Steel Pipe, Steel Pipe Piles, Alloy Steel Boiler Pipe, Wear Resistant Steel Plate
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Audited Supplier Audited Supplier Since 2021
Liaocheng Xinruyi Trading Co., LTD.

Manufacturer/Factory

Shandong, China Since 2021
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Factory Mining Industry Rock Bolt Self Drilling Tunnel Full Threaded Steel Sda Bar Hollow Grouting Anchor Rod

Factory Mining Industry Rock Bolt Self Drilling Tunnel Full Threaded Steel Sda Bar Hollow Grouting Anchor Rod

US $ 850-900 / Ton FOB
1 Ton (MOQ)
More
Standard : AISI, ASME, ANSI, JIS, GB
Contact Supplier
Audited Supplier Audited Supplier Since 2021
Liaocheng Xinruyi Trading Co., LTD.

Manufacturer/Factory

Shandong, China Since 2021
Chat Now Send Inquiry
Factory Direct Selling Solid and Hollow Self Drilling Anchor Bolts Rock Bolts

Factory Direct Selling Solid and Hollow Self Drilling Anchor Bolts Rock Bolts

US $ 700-850 / Ton FOB
25 Tons (MOQ)
More
Main Products: Seamless Steel Pipe, Stainless Steel Round Bars, Cold Drawn Steel Bars, Rock Bolt, Self Drilling Anchor Bolts, Hydraulic Structure Steel Pipe, Steel Pipe Piles, Alloy Steel Boiler Pipe, Wear Resistant Steel Plate
Contact Supplier
Audited Supplier Audited Supplier Since 2021
Liaocheng Xinruyi Trading Co., LTD.

Manufacturer/Factory

Shandong, China Since 2021
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Mine Roof Rebar Self Drilling Hollow Grouting Rock Bolt

Mine Roof Rebar Self Drilling Hollow Grouting Rock Bolt

US $ 1.8-5.5 / Piece FOB
100 Pieces (MOQ)
More
Certification : CE
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
Chat Now Send Inquiry
Supporting for Rocks Mortar Injection Solid Rebar Bolts Hollow Grouting Anchor Rod

Supporting for Rocks Mortar Injection Solid Rebar Bolts Hollow Grouting Anchor Rod

US $ 800-950 / Ton FOB
1 Ton (MOQ)
More
Main Products: Seamless Steel Pipe, Stainless Steel Round Bars, Cold Drawn Steel Bars, Rock Bolt, Self Drilling Anchor Bolts, Hydraulic Structure Steel Pipe, Steel Pipe Piles, Alloy Steel Boiler Pipe, Wear Resistant Steel Plate
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Audited Supplier Audited Supplier Since 2021
Liaocheng Xinruyi Trading Co., LTD.

Manufacturer/Factory

Shandong, China Since 2021
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Full Threaded Steel Self Drilling Anchor Bolt / Hollow Anchor Bar / Anchor Rods High Strength Self Drilling Hollow Grouting Rock Bolt

Full Threaded Steel Self Drilling Anchor Bolt / Hollow Anchor Bar / Anchor Rods High Strength Self Drilling Hollow Grouting Rock Bolt

US $ 635-655 / Ton FOB
3 Tons (MOQ)
More
Usage : Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
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Audited Supplier Audited Supplier Since 2023
Shandong Zhengde Metal Manufacturing Co., Ltd.

Manufacturer/Factory,Trading Company

Shandong, China Since 2023
Chat Now Send Inquiry
Fully Grouted Rock Bolts Micropile Hollow Anchor Bar / Anchor Bolt R38 / Anchor Rod

Fully Grouted Rock Bolts Micropile Hollow Anchor Bar / Anchor Bolt R38 / Anchor Rod

US $ 1.8-5.5 / Piece FOB
100 Pieces (MOQ)
More
Main Products: Rock Bolt, Resin Capsule, FRP Anchors, U-Shaped Steel Support, Welded Wire Mesh, Cable Bolt Strand, Drill Bit, Drill Pipe, Split Set Anchor Bolt, Hollow Grout Rock Bolt
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
Chat Now Send Inquiry
Threaded Hollow Bar/Self Drilling Anchor Bolt for Soil Nail/Rock Bolt R51L

Threaded Hollow Bar/Self Drilling Anchor Bolt for Soil Nail/Rock Bolt R51L

US $ 3-20 / Meter FOB
2,000 Meters (MOQ)
More
Molding Method : Hot-Rolled Steel
Contact Supplier
Audited Supplier Audited Supplier Since 2015
Handan Topmetal Co., Ltd.

Manufacturer/Factory,Trading Company

Hebei, China Since 2015
Chat Now Send Inquiry
Mining Machinery Parts Container House Steel Frame Other Steel Structure Construction Accessories Engineering & Construction Machinery Parts
Hollow Grouting Anchor Mining Bolt Left-Hand Thread Steel Rebar Rock Bolt

Hollow Grouting Anchor Mining Bolt Left-Hand Thread Steel Rebar Rock Bolt

US $ 0.15-1.65 / Piece FOB
500 Pieces (MOQ)
More
Main Products: Pipe Tube Hose, Waterproof Materials, Bridge Materials, Geosynthetics Materials
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Audited Supplier Audited Supplier Since 2018
Nanchang Jubo Engineering Material Co., Ltd.

Manufacturer/Factory,Trading Company

Jiangxi, China Since 2018
Chat Now Send Inquiry
Coal Mine Engineering Roadway Support Anchoring Anchor Tunnel Rock Bolt Hollow Grouted Self Drilling Tunnel Rock Bolt

Coal Mine Engineering Roadway Support Anchoring Anchor Tunnel Rock Bolt Hollow Grouted Self Drilling Tunnel Rock Bolt

US $ 1.55-5.58 / Piece FOB
100 Pieces (MOQ)
More
Connection : Hinged Bolts
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
Chat Now Send Inquiry
Epoxy Resin Fiberglass Self Drilling FRP Hollow Grouting Rock Bolt

Epoxy Resin Fiberglass Self Drilling FRP Hollow Grouting Rock Bolt

US $ 0.5-5.8 / Meter FOB
1,000 Meters (MOQ)
More
Main Products: FRP PU, FRP Roof, FRP Rebar, FRP Rockbolt, FRP Material
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Shaoxing Tengfeng Communication Technology Co., Ltd.

Manufacturer/Factory

Zhejiang, China Since 2024
Chat Now Send Inquiry
Hollow Underground Mine Roof Rebar Rock Bolt Hollow Anchor Bar Rod Ibo Grouting Hollow Anchor Bar Self Anchor Bolt

Hollow Underground Mine Roof Rebar Rock Bolt Hollow Anchor Bar Rod Ibo Grouting Hollow Anchor Bar Self Anchor Bolt

US $ 580-650 / Ton FOB
49 Tons (MOQ)
Contact Supplier
Audited Supplier Audited Supplier Since 2023
Shandong Mingko Industry Corporation

Manufacturer/Factory,Trading Company,Group Corporation

Shandong, China Since 2023
Chat Now Send Inquiry
Micropile Tunnel Bolting Thread Rods Hollow Grouting Rock Bolts

Micropile Tunnel Bolting Thread Rods Hollow Grouting Rock Bolts

US $ 1.8-5.5 / Piece FOB
100 Pieces (MOQ)
More
Main Products: Rock Bolt, Resin Capsule, FRP Anchors, U-Shaped Steel Support, Welded Wire Mesh, Cable Bolt Strand, Drill Bit, Drill Pipe, Split Set Anchor Bolt, Hollow Grout Rock Bolt
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
Chat Now Send Inquiry
Solid Steel Sda T Thread Bar Self-Drilling Hollow Anchors Rock Bolts Anchoring

Solid Steel Sda T Thread Bar Self-Drilling Hollow Anchors Rock Bolts Anchoring

US $ 7.5 / Piece FOB
10 Pieces (MOQ)
More
Surface Treatment : Galvanized
Contact Supplier
Audited Supplier Audited Supplier Since 2011
Qingdao Tianyicool Co., Ltd.

Manufacturer/Factory,Trading Company

Shandong, China Since 2011
Chat Now Send Inquiry
Grouted Hollow Anchor Bar Hollow Grouting Anchor Rod Rock Bolts Hollow Bolts

Grouted Hollow Anchor Bar Hollow Grouting Anchor Rod Rock Bolts Hollow Bolts

US $ 800-950 / Ton FOB
1 Ton (MOQ)
More
Main Products: Seamless Steel Pipe, Stainless Steel Round Bars, Cold Drawn Steel Bars, Rock Bolt, Self Drilling Anchor Bolts, Hydraulic Structure Steel Pipe, Steel Pipe Piles, Alloy Steel Boiler Pipe, Wear Resistant Steel Plate
Contact Supplier
Audited Supplier Audited Supplier Since 2021
Liaocheng Xinruyi Trading Co., LTD.

Manufacturer/Factory

Shandong, China Since 2021
Chat Now Send Inquiry
Self Drilling Anchors Fully Grouted Rock Bolts Micropile Hollow Anchor Bar

Self Drilling Anchors Fully Grouted Rock Bolts Micropile Hollow Anchor Bar

US $ 1.8-5.5 / Piece FOB
100 Pieces (MOQ)
More
Certification : CE
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
Chat Now Send Inquiry
Related Videos
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    What is Hot Sale R32 R38 T76 40cr Hollow Grouted Self Drilling Rock Anchor Bolt From China Factory
    Negotiable
    100 Pieces (MOQ)
    Contact Supplier
  • What is Factory Direct Selling Solid and Hollow Self Drilling Anchor Bolts Rock Bolts
    What is Factory Direct Selling Solid and Hollow Self Drilling Anchor Bolts Rock Bolts
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  • What is Hollow Bar Factory Price Thread Rods Hollow Grouting Rock Bolts Micropile Tunnel Bolting
    What is Hollow Bar Factory Price Thread Rods Hollow Grouting Rock Bolts Micropile Tunnel Bolting
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  • What is High Quality Factory Direct Alloy ISO Certification R25/R32/R38/R51/T76 Steel Grade Hollow Bolts Rock Bolts Hollow Grouting Anchor Rod
    What is High Quality Factory Direct Alloy ISO Certification R25/R32/R38/R51/T76 Steel Grade Hollow Bolts Rock Bolts Hollow Grouting Anchor Rod
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Hot Sale R32 Hollow Grouted Self Drilling Rock Anchor Bolt

Hot Sale R32 Hollow Grouted Self Drilling Rock Anchor Bolt

US $ 3 / Piece FOB
30 Pieces (MOQ)
More
Main Products: Self-Drilling Anchor System, Earth Anchor, Continuous Thread Bolts, Expansion Shell Bolts, Concentric Casing System, Bushing, Threaded Bar, Hollow Bar, Grill Grouting, Investment Casting
Contact Supplier
Audited Supplier Audited Supplier Since 2022
Ningbo Yinzhou Ternal Machinery Co., Ltd.

Manufacturer/Factory

Zhejiang, China Since 2022
Chat Now Send Inquiry
Coal Mine Soft Rock Roadway Tunnel Support and Repair Rod Hollow Grouting Anchor Bolt

Coal Mine Soft Rock Roadway Tunnel Support and Repair Rod Hollow Grouting Anchor Bolt

US $ 580-650 / Ton FOB
49 Tons (MOQ)
Contact Supplier
Audited Supplier Audited Supplier Since 2023
Shandong Mingko Industry Corporation

Manufacturer/Factory,Trading Company,Group Corporation

Shandong, China Since 2023
Chat Now Send Inquiry
Hollow Underground Mine Roof Rebar Rock Bolt Self Drilling Hollow Grouting Rock Bolt

Hollow Underground Mine Roof Rebar Rock Bolt Self Drilling Hollow Grouting Rock Bolt

US $ 1.5-3 / Piece FOB
100 Pieces (MOQ)
More
Main Products: Rock Bolt, Resin Capsule, FRP Anchors, U-Shaped Steel Support, Welded Wire Mesh, Cable Bolt Strand, Drill Bit, Drill Pipe, Split Set Anchor Bolt, Hollow Grout Rock Bolt
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
Chat Now Send Inquiry
High Strength Hollow Grouting Anchor Screw Rod Bolt, Self Drilling Anchor Anchor Grout Concrete Suitable for Difficult Conditions

High Strength Hollow Grouting Anchor Screw Rod Bolt, Self Drilling Anchor Anchor Grout Concrete Suitable for Difficult Conditions

US $ 1.5-3 / Piece FOB
100 Pieces (MOQ)
More
Standard : BS, GB, ASTM
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
Chat Now Send Inquiry

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Hollow Grouting Anchor Rock Bolt Hollow Note Pulp Shank Rod Underground Mining Roof Support

Hollow Grouting Anchor Rock Bolt Hollow Note Pulp Shank Rod Underground Mining Roof Support

US $ 2.4-3.6 / Piece FOB
100 Pieces (MOQ)
More
Main Products: Rock Bolt, Resin Capsule, FRP Anchors, U-Shaped Steel Support, Welded Wire Mesh, Cable Bolt Strand, Drill Bit, Drill Pipe, Split Set Anchor Bolt, Hollow Grout Rock Bolt
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
Chat Now Send Inquiry
Surrounding Rock System Shoring and Supporting Rock Bolts Hollow Grouting Anchor Rod

Surrounding Rock System Shoring and Supporting Rock Bolts Hollow Grouting Anchor Rod

US $ 800-950 / Ton FOB
1 Ton (MOQ)
More
Surface Treatment : Spray-Paint
Contact Supplier
Audited Supplier Audited Supplier Since 2021
Liaocheng Xinruyi Trading Co., LTD.

Manufacturer/Factory

Shandong, China Since 2021
Chat Now Send Inquiry
Rock Bolt for Tunnel R25, Hollow Bar Anchor

Rock Bolt for Tunnel R25, Hollow Bar Anchor

US $ 800-950 / Ton FOB
1 Ton (MOQ)
More
Main Products: Seamless Steel Pipe, Stainless Steel Round Bars, Cold Drawn Steel Bars, Rock Bolt, Self Drilling Anchor Bolts, Hydraulic Structure Steel Pipe, Steel Pipe Piles, Alloy Steel Boiler Pipe, Wear Resistant Steel Plate
Contact Supplier
Audited Supplier Audited Supplier Since 2021
Liaocheng Xinruyi Trading Co., LTD.

Manufacturer/Factory

Shandong, China Since 2021
Chat Now Send Inquiry
Self Drilling Anchor Hollow Grouting All Thread Rock Bolt

Self Drilling Anchor Hollow Grouting All Thread Rock Bolt

US $ 1.8-5.5 / Piece FOB
100 Pieces (MOQ)
More
Certification : CE
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
Chat Now Send Inquiry
High Grade Hollow Grouted Self Drilling Tunnel Rock Bolt Mining Anchor Bolt

High Grade Hollow Grouted Self Drilling Tunnel Rock Bolt Mining Anchor Bolt

US $ 0.1-0.5 / Piece FOB
1,000 Pieces (MOQ)
More
Main Products: Fastener, Hex Bolts, Stainless Steel Bolts, Carriage Bolts, U Bolt/Stud Bolt, Self Drilling Screws, Steel Nut, Washer, T Bolt, L Bolt
Contact Supplier
Audited Supplier Audited Supplier Since 2022
Ningbo Zhonglian Fastener Manufacture Co., Ltd.

Manufacturer/Factory,Trading Company

Zhejiang, China Since 2022
Chat Now Send Inquiry
Rod Mortar Anchor Threaded Screw Hollow Grouting Rod Rock Bolt

Rod Mortar Anchor Threaded Screw Hollow Grouting Rod Rock Bolt

US $ 1.8-5.5 / Piece FOB
100 Pieces (MOQ)
More
Certification : CE
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
Chat Now Send Inquiry
Hebei Manufacturer Supply Self Drilling Anchor Hollow Grouting All Thread Rock Bolt

Hebei Manufacturer Supply Self Drilling Anchor Hollow Grouting All Thread Rock Bolt

US $ 1.57-2.9 / Piece FOB
100 Pieces (MOQ)
More
Main Products: Rock Bolt, Resin Capsule, FRP Anchors, U-Shaped Steel Support, Welded Wire Mesh, Cable Bolt Strand, Drill Bit, Drill Pipe, Split Set Anchor Bolt, Hollow Grout Rock Bolt
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
Chat Now Send Inquiry
Mine Tunnel Roof Support Self Drilling Rock Hollow Grouting Anchor Bolt

Mine Tunnel Roof Support Self Drilling Rock Hollow Grouting Anchor Bolt

US $ 1.57-2.9 / Piece FOB
100 Pieces (MOQ)
More
Standard : GB
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
Chat Now Send Inquiry
GB 50086-2015 40cr JIS SCR440 ASTM5140 ISO 41cr4 Hot Rolled Hollow Grouting Anchor Rod Rock Bolts Hollow Bolts

GB 50086-2015 40cr JIS SCR440 ASTM5140 ISO 41cr4 Hot Rolled Hollow Grouting Anchor Rod Rock Bolts Hollow Bolts

US $ 800-950 / Ton FOB
1 Ton (MOQ)
More
Main Products: Seamless Steel Pipe, Stainless Steel Round Bars, Cold Drawn Steel Bars, Rock Bolt, Self Drilling Anchor Bolts, Hydraulic Structure Steel Pipe, Steel Pipe Piles, Alloy Steel Boiler Pipe, Wear Resistant Steel Plate
Contact Supplier
Audited Supplier Audited Supplier Since 2021
Liaocheng Xinruyi Trading Co., LTD.

Manufacturer/Factory

Shandong, China Since 2021
Chat Now Send Inquiry
Anchor Bar Self Drilling Hollow Screw Full Threaded Steel Rod Rock Bolt

Anchor Bar Self Drilling Hollow Screw Full Threaded Steel Rod Rock Bolt

US $ 1.8-5.5 / Piece FOB
100 Pieces (MOQ)
More
Certification : CE
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
Chat Now Send Inquiry
Mine Tunnel Roof Support Self Drilling Rock Hollow Grouting Anchor Bolt

Mine Tunnel Roof Support Self Drilling Rock Hollow Grouting Anchor Bolt

US $ 2.1-3.5 / Piece FOB
1 Piece (MOQ)
More
Main Products: Mine Car, Mucking Loader, Mining Locomotive, U Steel Support, Mine Support, Wall Cement Plaster Machine, Scraper Conveyor, Crawler Dumper, Concrete Pump
Contact Supplier
Audited Supplier Audited Supplier Since 2012
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.

Manufacturer/Factory

Shandong, China Since 2012
Chat Now Send Inquiry
Professional R&D and Production Team for Export Hollow Grouting Rock Bolts

Professional R&D and Production Team for Export Hollow Grouting Rock Bolts

US $ 1.55-5.58 / Piece FOB
100 Pieces (MOQ)
More
Connection : Hinged Bolts
Contact Supplier
Audited Supplier Audited Supplier Since 2024
Hebei Langben Building Materials Co., Ltd

Manufacturer/Factory

Hebei, China Since 2024
Chat Now Send Inquiry
Hollow Grouting Anchor Rod Hollow Grouting Rock Bolt Hollow Anchor Bar Rock Anchor Bolt Hollow Grouting Anchor Bolt
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