VEDALI HARDWARE CO., LTD
VEDALI HARDWARE CO., LTD Professional Hardware Supplier Perfect Engineering Solutions
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Stainless Steel Self Drilling Screws Hex Washer Head Metal Screw Tapping No. 14
With good stainless steel material and perfect working performances , stainless steel self drilling screws are used to various metal sheets and metal proofs in building .
Stainless steel self drilling screws with hexagon head that are driven by a hex socket pipe or spanner for easy operation ; Normally , self drilling screws with teck points which are completely different from other screw’s points , this kind point with fast drilling performance and improve efficiency much .
Specific Dimensions
Self drilling screws with tapping threads based on standard DIN7504 K
| Head diameter | dk | 12.6 |
| Thread length | L | 3/4 |
| Shaft diameter | d | #12 |
| Head height | K | 5.5 |
| Hex cross width | s | 9.5 |
| Pitch | P | 11 per inch |
| TPI | 16 | |
| Thread type | ST | |
Typical Features
● Good ductility
● High tensile strength
● No magnet
● Corrosion resistant
● Fine roughness
Torque
Stainless steel self drilling screws are used for securing metal sheets , the thickness of metal sheets should be suitable for related specification of screw .
| Screw size | #12 |
| Min. case Hardness | 600 |
| Core Hardness Hv 0.3 | 300~400 |
| Min. Torsional Lb-in | 61 |
| Drill point Point # | Nr. 3 |
| Test Plate Thickness | 0.062~0.068 |
Physical Performance
| Material | Stainless steel |
| Property class | 18-8 |
| Tensile strength σb (MPa) | 650 |
| Yield Strength σs (MPa) | 320 |
| Elongation δ5 (%) | 35 |
| Reduction of area ψ (%) | 45 |
| Density g/cm3) | 7.98 |
Finish
Stainless steel self drilling screws are polished surface with good brightness
| Finish | Polishing |
| Roughness | R6.3 |
| Surface request | No burrs and bright |
Installations
1 , Choose a special electric driller for self drilling screws
2 , Adjust locator in electric driller to a proper posiztion for leading screws are to be driven to right position
3 , Check drilling rate of driller
| Screw size | Drilling rate RPM |
| 3.5 ( 6 # ) | 1500 - 2500 |
| 3.9 ( 7 # ) | 1500 – 2500 |
| 4.2 ( 8 # ) | 1500 - 2500 |
| 4.8 ( 10 # ) | 1500 - 2500 |
| 5.5 ( 12 # ) | 1000 – 1800 |
| 6.3 ( 14 # ) | 1000 - 1800 |
4 , Choose attached screwdriver bit and drive screws into metal sheets .
If you take a single electric driller operated by hand , please note
① Don’t put more joint on locating device in electric driller
② Make sure the sheet thickness is suitable for the length of screw , or screws will be broken easily .
③ Don’t put more RMP that overs max RMP of electric driller , or the point of screws will be melt down .
④ Don’t choose conflicting model for screws .
Applications
Stainless steel self drilling screws are normally used to metal sheets
▲ Metal sheets on roof
▲ Metal wall sheet
▲ Fence
▲ Fender
▲ Furniture
▲ Brige
▲ Highway equipments
Characteristics
▲ Wide versatility
▲ Top material
▲ Quick installation
▲ Convenient operation
▲ Simple deign
▲ Recylable
▲ Eco-friendly
▲ Standard Sizes
Tips for installations
| ★ A screw gun with a depth sensitive nose piece that be used to install drillers ,the screwgun should be a min of 4 amps and a RPM range from 0 to 2500c |
| ★ Adjust the screw gun nose piece to properly set the fastener |
| ★ Damaged bit tips should be replaced |
| ★ The fastener is fully setted when the head is flush with the work surface |
| ★ The fastener have to penetrate beyond the metal structure a min of 3 picthes of threads |
| ★ Put 13 kgs or so force on screw gun and keep force direction is same as the centr of drilling point |