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Flat Head Hi-low Thread Screws Blue Dacromet for Masonry 7.5 mm Square Cone Point
Hi-low threads screws with two different threads , some threads are lower and some threads with taller , these threads are placed in crisscross , and there is a cutting line on threads , this design make screws are to be installed more quickly and smoothly .
Hi-low threads screws sometime are named hi-lo thread screws or thread cutting screws , and a square sharp point provides quick drilling performance and cutting function .
Material
Hi-low threads screws are made from carbon steel with grade 6.8 .
Specification
| Thread diameter | 7.5 |
| Thread length | 35 |
| Head diameter | 11.5 |
| Head height | 4.5 |
| Head drive | PH 2 |
More specifications
| d | D | K | S | b |
| 2 | 3.8 | 2 | 1.5 | 16 |
| 2.5 | 4.5 | 2.5 | 2 | 17 |
| 3 | 5.5 | 3 | 2.5 | 18 |
| 4 | 7 | 4 | 3 | 20 |
| 5 | 8.5 | 5 | 4 | 22 |
| 6 | 10 | 6 | 5 | 24 |
| 8 | 13 | 8 | 6 | 28 |
| 10 | 16 | 10 | 8 | 32 |
| 12 | 18 | 12 | 10 | 36 |
| 14 | 21 | 14 | 12 | 40 |
| 16 | 24 | 16 | 14 | 44 |
| 18 | 27 | 18 | 14 | 48 |
| 20 | 30 | 20 | 17 | 52 |
| 22 | 33 | 22 | 17 | 56 |
| 24 | 36 | 24 | 19 | 60 |
| 30 | 45 | 30 | 22 | 72 |
| 33 | 50 | 33 | 24 | 78 |
| 36 | 54 | 36 | 27 | 84 |
Standaqrd
Hi-low threads screws are normally customized according to applications .
Finish
Blue dacromet
Physical Performance
| Tensile strength Mpa | 305 |
| Yeild strength Mpa | |
| Hardness HV | |
| Density g/cm3 | 7.86 |
| Elongation % |
Product characteristics
1 . Good corrosion resistance
Hi-low threads screws are plated in dacromet finish that make sure screws are not to be rusted in years .
2 . Harden material
Hardness for screws up to HV450 .
3 . Quick driling performance
It is more easy and quick installtino as hi-low threads screws with special thread design and square sharp point ,
4 . No burrs or scratch and bright surface
5 . Screws can be recyclable .
6 . Not easy to be broken
Installation
1 . Operated by screwdriver or screwgun with phillips bit .
2 . Pre-drill hole for more easy and accurate installation .
3 . Make sure screws are located exactly to threaded hole centre of objects .
4 . Do not put over torque on Hi-low threads screws .
Application
Hi-low threads screws are mainly designed to concrete wall or brik in buliding .
