VEDALI HARDWARE CO., LTD
VEDALI HARDWARE CO., LTD Professional Hardware Supplier Perfect Engineering Solutions
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Standard Hex Washer Head Bi Metal Screws Self Drill Fastener DIN 7504 Screws
Bi-metal Self Drilling Screws with hexagon washer head combined with a EPDM bonded washer ,full tapping threads with drilling point that can cut and drill fast into metal sheet in a power drill .
Bi-metal self drilling tapping screws are made in two different materials for combination of durable corrosion and strong hardness . Normally , Bi-metal self-drilling tapping screws are made of stainless steel but drilling point is made from carbon steel so that screws can be capable of drilling metal sheets smoothly and work for a long time .
Typical Features
1 Strong hardness
2 Perfect durable corrosion
3 Recyclable
4 Fast drilling rate
Specification
DIN7504
| D | L | P | Df | S | e | K |
| 5.5(#12) | 19 | 1.8 | 11 | 8 | 8.7 | 5.4 |
| 5.5(#12) | 25 | 1.8 | 11 | 8 | 8.7 | 5.4 |
| 5.5(#12) | 32 | 1.8 | 11 | 8 | 8.7 | 5.4 |
| 5.5(#12) | 38 | 1.8 | 11 | 8 | 8.7 | 5.4 |
| 5.5(#12) | 51 | 1.8 | 11 | 8 | 8.7 | 5.4 |
| 5.5(#12) | 64 | 1.8 | 11 | 8 | 8.7 | 5.4 |
| 6.3(#14) | 19 | 1.8 | 13.5 | 10 | 10.95 | 5.9 |
| 6.3(#14) | 25 | 1.8 | 13.5 | 10 | 10.95 | 5.9 |
| 6.3(#14) | 32 | 1.8 | 13.5 | 10 | 10.95 | 5.9 |
| 6.3(#14) | 38 | 1.8 | 13.5 | 10 | 10.95 | 5.9 |
| 6.3(#14) | 51 | 1.8 | 13.5 | 10 | 10.95 | 5.9 |
| 6.3(#14) | 60 | 1.8 | 13.5 | 10 | 10.95 | 5.9 |
| 6.3(#14) | 75 | 1.8 | 13.5 | 10 | 10.95 | 5.9 |
| 6.3(#14) | 80 | 1.8 | 13.5 | 10 | 10.95 | 5.9 |
| 6.3(#14) | 100 | 1.8 | 13.5 | 10 | 10.95 | 5.9 |
| 6.3(#14) | 110 | 1.8 | 13.5 | 10 | 10.95 | 5.9 |
| 6.3(#14) | 120 | 1.8 | 13.5 | 10 | 10.95 | 5.9 |
| 6.3(#14) | 130 | 1.8 | 13.5 | 10 | 10.95 | 5.9 |
| 6.3(#14) | 150 | 1.8 | 13.5 | 10 | 10.95 | 5.9 |
| 6.3(#14) | 175 | 1.8 | 13.5 | 10 | 10.95 | 5.9 |
Note :
1 , We offer non-standard sizes as well .
2 , Bonded EPDM washer is optional .
Bi-metal self-drilling tapping screws must to be plated a film protective finish to prevent screws from rusting and extend service time . we supply different finish for different applications , you can make a right choice according to the characteristic each kind .
1 , Zinc
This is popular finish and various colors for choice . The resistance of rust is good and eco-friendly .
2 , Nickel
Nickel finish makes the surface of the screws will more bright and hardened and the performance of screws will be improved .
3 , Polishing
Bi-metal self-drilling tapping screws can be polished after forming for getting a bright surface and anti-rust purpose , but it is not good as other finishes on anti-rust . polish is usually for stainless steel screws.
4 , Tin
It is very perfect to be anti-rust , and widely used to components .
5 , Brass
It is available for stainless steel screws and carbon steel screws and perfect on durable corrosion .
6 , Dacromet
This finish is used for screws with big sizes and can stop screws to be rusted long time even under bad surroundings .
More options for bi-metal self-drilling tapping screws
Stainless steel : SUS 201 , SUS303 , SUS 304 ,SUS 316 , SUS 416 ,SUS 430 and SUS 420 .
Carbon steel : 1018 , 1022 , 1035 , 1045 , SCM 435 and 40CRO
Bi-metal self drilling tapping screws are used to drill sheet metal should be considered the thickness of sheet and make sure enough torque to finish secure .
| d/ diam | #6 | #7 | #8 | #10 | #12 | #14 (1/4) |
| Min. case Hardness | 600 | 600 | 600 | 600 | 600 | 600 |
| Core Hardness Hv 0.3 | 300~400 | 300~400 | 300~400 | 300~400 | 300~400 | 300~400 |
| Min. Torsional Lb-in | 24 | 24 | 42 | 61 | 92 | 150 |
| Drill point Point # | Nr 2 | Nr. 2 | Nr. 2 | Nr. 3 | Nr. 3 | Nr. 3 |
| Test Plate Thick ness | 0.062~0.068 | 0.062~0.068 | 0.062~0.068 | 0.062~0.068 | 0.062~0.068 | 0.062~0.068 |
Torque Strength
| Gauge | #6 | #8 | #10 | #12 | #14 |
| Value | 41.2 | 76 | 144 | 186 | 235 |
Unit:Kgf
Shearing Strength
| Gauge | #6 | #8 | #10 | #12 | #14 |
| Value | 370 | 690 | 925 | 1110 | 1495 |
Unit:Kgf
Tensile Strength
| Gauge | #6 | #8 | #10 | #12 | #14 |
| Value | 689 | 986 | 1269 | 1663 | 2286 |
Unit:Kgf
Applications
Bi-metal self drilling tapping screw is used for lock metal sheet that service in building ,bridge ,furniture and barrier etc .
Competitive Advantage
※ Top quality with cheap price
※ Strict dimensions control and high precision
※ All Screws are eco-friendly
※ Quick delivery
※ Perfect sales-after service
Features