Stainless Steel Self Drilling Screws Hex Washer Head Metal Screw Tapping No. 14
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 |
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