R25 R32 R38 R51 Threaded Hollow Bar for Tunnels and Underground Engineering

• Application: Construction
• Certification: ISO
• Surface Treatment: Yes
• Technics: Hot Rolled
• Material: Steel
• Type: Rock Bolt
• Model NO.: R25, R32, R38, R51, T76
• Transport Package: Bundle
• Specification: R25, 32, 38, 51, T76
• Trademark: TOPMETAL
• Origin: China
• HS Code: 7308400000
• Production Capacity: 100000m

Product Description

Product Description

With continuous R or T thread, the bar can be connected by the coupling.

Features:
1) It is made of high-strength steel by rolling, and the material conforms to GB/T 3077 "alloy structural steel".
2) The R-type hollow bar is produced with a left-handed wave thread, which uses a large pitch standard thread. The thread shape conforms to ISO 10208 "rock drilling tool - left-handed wave thread" and ISO 1720 standard, and can be combined with a corresponding nut, coupling. , drill bit, adapter, etc.
3) The T-type hollow bar is produced with a left-handed large pitch trapezoidal thread, and it can be assembled with nut ,coupling, drill bit, adapter, etc.
4) Surface treatment requirements such as galvanizing, epoxy and double anti-corrosion can be selected according to the conditions of use.
5) The length is usually 3m, 4m, 6m.
6) If the customer has special requirements for the diameter, length, thread or surface treatment of the rod, it can also be customized.

Applications:
It can be used as a drill pipe when drilling, and can be used as a grouting pipe during grouting. It can be used as a reinforcing rib after installation.

Advantage:
1) High strength and quality material is selected, the hollow bar has high strength and plasticity;
2) The hollow structure is used to make it more resistant to bending and shearing than solid bar of the same cross-sectional area;
3) The inner hole of the hollow bar can be used as a grouting passage;
4) The bar is processed by rolling to process the continuous thread, which can be used for any cutting or be connected by coupling for a longer length, and can be used in a small space.
5) The full-length continuous thread can have better adhesion to the cement layer, it can be used as strong support  for tunnels and rock slopes.

Drill bits, nut, plate and coupler, etc.will be accembled accordingly.

Product Parameters

 

Type	Outer Dia.(mm)	Inner Dia.(mm)	Ultimate Load(KN)	Yield Load(KN)	Weight(kg/m)
R25N	25	14	200	150	2.3
R32L	32	22	260	200	2.8
R32N	32	21	280	230	2.9
R32/18.5	32	18.5	280	230	3.4
R32S	32	17	360	280	3.5
R38N	38	21	500	400	4.8
R38/19	38	19	500	400	5.5
R51NL	51	36	550	450	6.3
R51N	51	33	800	630	8.0
T76N	76	51	1600	1200	16.5
T76S	76	45	1900	1500	19.7

 

Detailed Photos

 

 

 

FAQ

Q1:Can you send samples?
A:Of course, we can provide customers with free samples and express shipping service to all over of the world.

Q2:What product information do I need to provide?
A:Please kindly provide the grade, width, thickness, surface treatment requirement should you have and quantities you need to purchase.

Q3:It's my first time to import steel products, can you help me with it?
A:Sure,we have agent to arrange the shipment, we will do it together with you.

Q4:What about product prices information?
A:Prices various according to periodic price changes of raw materials.

Q5:Do you provide custom made Products service?
A: Yes,if you have your own design , we can produce according to your specification and drawing.

Q6:What are the certifications for your products?
A:We have ISO 9001, MTC, third parties' inspections are all available such SGS, BV ect.

Q7:How long does your delivery time take?
A:In general, our delivery time is within 7-15 days, and may be longer if the quantity is extremely large or special circumstances occur.

Q8: How many countries you already exported to?
A:We have exported to America, Canada, Brazil, Chile, Colombia, Russia, Ukraine, Thailand, Myanmar, Vietnam, India, Kenya, Ghana,somalia and other African countries.Our export experience is rich, we familiar with different market demands, can help customers avoid a lot of trouble.

Q9:Can I go to your factory to visit?
A:Of course, we welcome customers from all over the world to visit our factory.

Q10:Does the product have quality inspection before loading?
A:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed and customers can appoint third parties to inspect the products before loading too.

Q11:What is your working time?
A:In general, our online service time is Beijing time: 8:00-22:00, after 22:00, we will reply to your inquiry in the coming working day.