The Eternal Question...

For such commonly-used fasteners, the confusion in features and application of both self-tapping and self-drilling screws is equally common. And between the two screws, the vernacular is often confused, with the name for one being used for the other.  

If you are looking for more details, kindly visit our website.

So, let&#;s set the record straight. Here are the differences between both fasteners. To summarise:

Self-Tapping &#; a screw for securing thinner sheet metals and other substrates that cuts its own thread, but usually requires a predrilled or pre-punched hole.

Self-Drilling &#; a screw that can, well, self-drill through various gauges of metal materials without predrilling.

Both &#; perfect for securing two materials&#;steel to steel or steel to timber&#;for when a better hold compared, to nuts and bolts, is required.

To elaborate, here are the finer facts:

• Creates its own thread while turning, therefore it does not need matching female threads, like those in a nut from a nut/bolt set or machine screws.
• Can also be used in wood and softer substrates like some plastics.
• This screw features a Type AB point.
• To remember it when you see it, this screw has a point &#;like a pencil&#;.

Most common uses &#;

• 1 and 2-layer thin gauge sheet metal securing
• Fastening of aluminium sections to each other and into screw flutes.
• Screwing into plastic housings.
• Fixing metal brackets into ply and timber.
  
  
  

• With a point &#;like a drill bit&#;, these screws create their own hole, and their own thread in one action. This is probably where the confusion with self-tappers comes in &#; both kinds of screws are technically self-tapping as far as the function of their threads are concerned, but the massive difference is in the function of their points.
• Self-drillers can be characterised as a fine thread or a coarse thread, self-tappers can&#;t.
• In short, self-tappers can&#;t drill, self-drillers can as well as tap a thread.
• Self-drillers are also commonly called &#;Tek&#; screws, a proprietary brand name associated with their unique shape and function.
• Drill point sizes dictate drilling capacity. Common Tek point sizes are #2, #3, #4 and #5 (Series 500) &#; 2 and 3 most common, 4 and 5 for going through thicker metal.
  
  

Most common uses &#;

• Cladding and metal roofing
• HVAC &#; duct, clips and brackets
• Carports/sheds/garages
• General construction
• Steel framing
  
  
  

Do you have any questions about the application of these screws for what your are doing? Get in touch with the leaders in All Things Fixings now.

Basic Info.

Model NO.

T103

After-sales Service

Can Exchange Goods

Warranty

2 Year

Certification

ISO :, ISO :

Standard

AISI, ASME, BS, ANSI, JIS, GB, GOST, ASTM, DIN

Surface Treatment

Without Processing

Manufacturing Process

Hot Rolled

Material

Carbon Steel

Terms of Payment

30%T/T Advance + 70% Balance

Trade Terms

EXW Fob CFR CIF

Place of Origin

China

Length

Custom Length

Diameter

Custom Diameter

Materials

High Strength

Surface

Antirust Coating or Zinc Plating

Way to Install

According to Actual Engineering

Installation Method

Pre-Stressed Anchor,Traction Bolt,Grouted Rock Bol

Marking and Numbering

Custom

Trademark

Shan Shui Special Steel

Transport Package

Standard Seaworthy Packing

Specification

1/8&#;&#;-24&#;&#; SCH40 SCH80 STD or customization

Origin

Liaocheng Shandong

HS Code

Product Description

 Product Description

Hollow anchor bar means a rod that transfers the structures or geotechnical load to a stable rock formations, anchor bolt consists of bar, drill bit, coupling, plate, grouting stopper and nut. Widely used as an efficient anchoring means, in tunnel pre-support, slope, coast, mine, water conservancy projects, building foundation, roadbed reinforcement and geological diseases treatment such as landslip, crack, sink age. It's irreplaceable in narrow construction environment. Hollow anchor bar is made of seamless tube with high strength.

Features of Hollow Grouting Anchor 

Bar

:

• Fits standard Boomer, ROC and Mustang rigs.

• Particularly suitable for difficult ground conditions.

• A high rate of installation since drilling, placing and grouting can be performed in one single operation.

• Self drilling system eliminates the requirement for a cased borehole.

• Installation with simultaneous drilling and grouting possible.

•

 

Easy installation in all directions, also upwards.

• Suitable for working in limited space, height and in areas of difficult access.

• Simple post grouting system.

• Hot-dipped galvanizing for corrosion protection

Advantages and Characteristics

 

:

1.No casings required, because anchor bars can be drilled into loose soils without needing casings to support the boreholes.

2.Fast drilling and installation, because drilling, installation and grouting are in a single operation.

3.Both rope threads and trapezoid threads are robust and ideal for rotary-percussive drilling and ensuring a high level of bond with the borehole gout.

4.The hollow core not only serves for flushing during drilling, but also for grouting after

drilling.

5.Continuous threads ensure the bars can be cut and coupled at any point, or extended.

6.Different anchor bits are available for different ground conditions.

7.Duplex anti-crossion prosess ,hot-dip galvanized and epoxy coating system.

Rockbolt R51L-38 Self drilling anchor bolt Rotating anchor for cable anchoring slope

Product Parameters

R-Thread Anchor 

Rod

 Technial Data

 

R25N

R32N

R32S

R38N

R51L

R51N

T76N

T76S

Outside diameter

(mm)

25

32

32

38

51

51

76

76

Internal diameter

(mm)

14

19

16

19

36

33

52

45

Ultimate load

capacity

(KN)

200

280

360

500

550

800

Yield load

capacity

(KN)

150

230

280

400

450

630

Tensile strength,

Rp0.2

(N/mm2)

800

800

800

800

800

800

800

800

Yield strength,

Rp0.2

(N/mm2)

650

650

650

650

650

650

650

650

Weight

 

(Kg/m)

2.3

3.2

3.6

5.5

6.5

8.0

16.0

19.7

Thread type

(left-hand)

ISO

 

ISO

 

MAI

 

T76 Standard

Steel grade

En-1

 

(Alloy structure steel)

Compared to carbon steel, alloy structure steel has high anti-corrosion capacity and high mechanical.

R thread anchor bar or called rock rod, soil nail, which is a kind of threaded hollow bar, bar surface with an rope thread according to ISO & . It was firstly invented by MAI on S to solve the low construction speed on complicated underground works, nowadays; it is very popular all around the world.

Thread size: R25, R32, R38, R51, T76.

Thread standard: ISO, ISO etc.

T-Thread Anchor 

Rod

 Technial Data

Bar Type

Outside Diameter

(mm)

Inside Diameter

(mm)

Cross section

(mm2)

Ultimate Load

KN

Yield Point

KN

Weight

(kg/m)

Thread Left/

Right Hand

30/11

30

11

446

320

260

3.3

Lift or right

30/14

30

14

395

260

220

2.9

Lift or right

30/16

30

16

382

220

180

2.7

Lift or right

40/16

40

16

879

660

525

7.0

Lift or right

40/20

40

20

726

539

430

5.6

Lift or right

52/26

52

26

929

730

10.0

Lift or right

73/53

73

53

970

12.3

Lift or right

73/56

73

56

KSQ Technology supply professional and honest service.

785

11.1

Lift or right

73/45

73

45

17.8

Lift or right

T thread anchor bar surface with a trapezoidal thread, this design of connection is much stronger and reliable when compared with rope thread, we supply full sizes from T30 to T103.

Thread size: T30, T40, T52, T73, T103, T127, T130.

Thread standard: ISO, ISO etc.

Anchor Plate

 

R25N

R32N

R32S

R38N

R51L

R51N

T76N

T76S

Dimention

 

(mm)

150*150

200*200

200*200

200*200

200*200

250*250

250*250

250*250

Thickness

 

(mm)

8

10

12

12

20

40

40

40

Hole diameter

 

(mm)

30

35

35

41

60

60

80

80

Weight

 

(KG/PC)

1.4

3

3.7

3.6

8.8

18.5

18

18

Cold deformed with geometry

Anchor Coupling

  

R25N

R32N

R32S

R38N

R51L

R51N

T76N

T76S

Outside diameter

 

(mm)

35

42

42

52

63

63

95

95

Length

 

(mm)

120

145

160or190

180

180

200

200

200

Weight

0.45

0.7

0.75

1.4

1.7

1.9

6.4

6.4

Machined steel coupling middle stop

The hollow bar is continuously threaded, it can be cut and coupled anwhere along its length.

The coupling enables direct end-to-end energy transmission between each bar, reducing losses and ensuring maximum percussive engergy at the drill bit.

Drill Bit

 

R25N

R32N

R32S

R38N

R51L

R51N

T76N

T76S

Diameter

 

(mm)

41,51

51,76,90

90,100,110,115,130

130,150,160,180,200

Hardened cross bit

(EX)

Hardened cross bit for loose to medium dense condition with small boulders.

Tungsten cross bit

(EXX)

TC cross bit for soft to medium rock for mations

Hardened button bit

(ES)

Hardened buuton bit for unconsolidated rock with boulders.

Tungsten carbon button bit

(ESS)

Button bit with TC inserts for medium rock for formations.

Hardened arch bit

(EC)

Hardened drill bit with optimized geometry for uncon

 

solid

 

dated soil

with small boulders.

Tungsten carbon arch bit

(ECC)

TC drill bit with optimized geometry for soft to medium rock formations.

Hardened drop center bit

(EY)

Hardened cross bit for loose to medium dense ground conditions

TC drop center bit

(EY)

TC drill bit for soft to medium rock formations.

Casting clay bit

(EW)

Casting clay bit with optimized geometry for very soft to soft caly.

Machined steel bit or Casring steel bit

The sacrificial drill bit is an important part of the self drilling anchoring system.

Choose suitable bits according to different soil type.

Anchor Nut

 

R25N

R32N

R32S

R38N

R51L

R51N

T76N

T76S

Key size

 

(mm)

41

46

46

50

75

75

100

100

Length

 

(mm)

135

45

45

55

70

70

80

80

Weight

 

(kg/pc)

0.25

0.35

0.35

0.5

1.55

1.55

3.6

3.6

Machined steel nut or casting steel nut

The hexagonal and spherical nuts are made from high precision steel (40Cr,HRC 20-25) to meet the stringent demands on anchor specifications and the daily uses of reinforcement work.

All nuts exceed the ultimate strength of the rod.

Rockbolt R51L-38 Self drilling anchor bolt Rotating anchor for cable anchoring slope

Detailed Photos

We can custom-produce anchors of different materials, lengths, thicknesses and diameters according to your requirements.

 



Rockbolt R51L-38 Self drilling anchor bolt Rotating anchor for cable anchoring slope
 

Company Profile

Rockbolt R51L-38 Self drilling anchor bolt Rotating anchor for cable anchoring slope

Shandong Shanshui Special SteeI Co., Ltd . is a company specializing in anchor hollow bar,self drilling anchor,seamless steel pipes, precision steel pipes, alloy steel pipes, boiler steel pipes, cold drawn steel pipes, spiral steel pipes, longitudinally welded pipes, seamless square pipes, welded square pipes, all raw materials All come from first class steel mills at home and abroad to ensure stable performance and quality of finished products.
Shandong Shanshui Special Steel Co., Ltd. was established in and has a standing inventory of more than 20,000 tons. We focus on the production and sales of steel pipe and anchor products, as we have been engaged in domestic market and foreign market for more than ten years and have rich experience in sales and inventory. Our company has established modern large-scale outdoor warehouses and indoor warehouses. We have products of different specifications in stock, and can customize products of different specifications according to your requirements.

 

Application Scope

Hollow anchors can be used in the fields of water conservancy engineering, tunnel reinforcement, subway, mine support, and construction.

During the constructions of underground works, it is very common to encounter soft rock, fractured zone and large deformation due to high ground stress. In the case of serious collapsing, extra-long anchor is needed instead of ordinary one.
 

Technology Process

The Self Drilling Anchor system is comprised of a hollow threaded anchor bar with a sacrificial drill bit that performs drilling,anchoring and grouting in a single operation. Self drilling anchor system is mainly used in slope stabilization, tunneling pre-support, foundations with micro piles etc projects.

1. Connect the alloy drill and anchor rod one end, on the other end, connect the drill sleeve and shank adapter,

 

then connect the drilling rig or hand-held drill. Then start drilling, fill the cooling water while drilling.( If you want to lengthen the anchor rod, can connect the coupling, and then drilling)

2. Take down the drill, put the stop-grouting plug into the rod, and insert it to the hole,

 

then ready to grout. Special circumstances like surrounding rock grouting tension is over or surrounding rock is too broken, can use anchor agent to seal the hole.

3. Connect quick grouting coupling and anchor rod end, connect other end of grouting machine.

4. Start grouting, when grouting full and reach design value then power off. Grouting pressure according to the design parameters and grouting machine performance determine,

 

Cement/sand reference values is 1:0 ~ 1:1, water/cement reference value is 0.45:1 ~ 0.5:1.

5. Install anchor plate and nuts, and tighten nuts.

 Packaging and Transportation
The packaging is packaged in tarpaulins and wooden boxes to ensure that it will not rust and corrode in the process of encountering water.
 
 

Hollow anchors can be used in the fields of water conservancy engineering, tunnel reinforcement, subway, mine support, and construction.During the constructions of underground works, it is very common to encounter soft rock, fractured zone and large deformation due to high ground stress. In the case of serious collapsing, extra-long anchor is needed instead of ordinary one.The packaging is packaged in tarpaulins and wooden boxes to ensure that it will not rust and corrode in the process of encountering water.

 

Certifications

FAQ

 

What kind of company is Shandong Shanshui Special Steel Co., LTD.?
Shandong Shanshui Special Steel Co., Ltd. is a well-known high-quality steel manufacturer and supplier in Shandong Province, China. With our pursuit of excellence, we specialize in the production of various steel pipes and hollow anchors, including seamless steel pipes, welded steel pipes and alloy steel pipes.
Our company is committed to providing customers with high-quality, reliable steel products. We have built a strong reputation nationally and internationally for consistent product quality and customer satisfaction, providing the highest quality products and services at the most competitive prices

Where is the factory of Shandong Shanshui Special Steel Co., LTD.?

Yuhaizi Village, Guangping Town, Liaocheng City, Shandong Province

How about our product quality and after-sales service?

The hollow anchors we produce are the first product warranty service in Liaocheng, that is, if there is a product quality problem, our company can undertake warranty services such as exchange and return. Workshop execution: process cards, work orders, 2-hour quality inspection, incoming inspection, outgoing inspection, etc. to ensure that unqualified products are not produced or leave the factory.

What can you buy from us?

The hollow anchors we produce are the first product warranty service in Liaocheng, that is, if there is a product quality problem, our company can undertake warranty services such as exchange and return. Workshop execution: process cards, work orders, 2-hour quality inspection, incoming inspection, outgoing inspection, etc. to ensure that unqualified products are not produced or leave the factory.

Shandong Shanshui Special Steel Co., Ltd. can provide various types of steel pipes and hollow anchors, including but not limited to:

   1.Seamless steel pipes: Suitable for high temperature, high pressure, and special applications in industries such as petroleum,natural gas, chemical, and power.

   2.Welded steel pipes: Suitable for general industrial, construction, and structural purposes, such as buildings, bridges, and machinery manufacturing.

   3.Alloy steel pipes: Treated with alloy elements, these pipes have high strength, wear resistance, and corrosion resistance. They are widely used in industries such as petroleum, chemical, power, and aerospace.

   4.Oil pipes: Used for oilfield development and oil transportation, these pipes are resistant to high temperatures and corrosion.

   5.Gas pipes: Used for natural gas transportation, these pipes have high pressure and corrosion resistance.

   6.Hydraulic support pipes: Used in mining, construction, and mechanical equipment as hydraulic supports, these pipes have high strength and corrosion resistance. 

   7.Hollow anchors: mine support field, tunnel reinforcement field, construction field, water conservancy engineering field, subway field, underground engineering field

In addition, we also provide customized steel pipe and customized hollow anchor products. We can produce pipes with special specifications, materials, and processing requirements according to customer needs.

For more T Thread Self Drilling Anchor Barsinformation, please contact us. We will provide professional answers.