7.5 mm Carbon Steel Torx Head Masonry Screws For Concrete Galvanized Fastener
7.5 mm Carbon Steel Torx Head Masonry Screws For Concrete Galvanized Fastener
Masonry Screws are also known as concrete screws mainly used to concrete , harden brick and block etc . enhanced flat head and torx drive , the point for masonry screw is cone shape that lets it drill material as fast as soon .
Normally , the thread diameter is 7.5mm ( 0.295 Inch ) and length can be up to 300 mm , Hi-low tapping threads with cutting line ( if required ) and sharp point style , sometimes , the point can be cut for more easy to drill hole .
The head drive for masonry screws can be designed in different styles as following
Typical Features
◆ Harden material
◆ High tensile strength
◆ Perfect drilling performance
◆ Long Service
Specification
| Specification | Head dia. | Thread dia. | Length | Pitch |
| d | D | d | L | P |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 36 | 2.4 ~ 2.8 |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 42 | 2.4 ~ 2.8 |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 52 | 2.4 ~ 2.8 |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 62 | 2.4 ~ 2.8 |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 72 | 2.4 ~ 2.8 |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 80 | 2.4 ~ 2.8 |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 90 | 2.4 ~ 2.8 |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 102 | 2.4 ~ 2.8 |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 112 | 2.4 ~ 2.8 |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 120 | 2.4 ~ 2.8 |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 132 | 2.4 ~ 2.8 |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 142 | 2.4 ~ 2.8 |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 152 | 2.4 ~ 2.8 |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 182 | 2.4 ~ 2.8 |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 190 | 2.4 ~ 2.8 |
| 7.5 | 11 ~ 12 | 7.3 ~ 7.6 | 200 | 2.4 ~ 2.8 |
Installation
1 . Drilling a pre-hole in material with pre-depth for concrete screw ( see details in table )
2 . Inserting concrete screw into hole and screwing it in a electric driller
| Specification | Length | Pre-depth |
| 7.5 | 36 | 2.3 ~ 3.15 |
| 7.5 | 42 | 2.3 |
| 7.5 | 52 | 2.3 |
| 7.5 | 62 | 2.3 |
| 7.5 | 72 | 2.3 |
| 7.5 | 80 | 2.3 |
| 7.5 | 90 | 2.3 |
| 7.5 | 102 | 2.3 |
| 7.5 | 112 | 2.3 |
| 7.5 | 120 | 2.3 |
| 7.5 | 132 | 2.3 |
| 7.5 | 142 | 2.3 |
| 7.5 | 152 | 2.3 |
| 7.5 | 182 | 2.3 |
| 7.5 | 190 | 2.3 |
| 7.5 | 200 | 2.3 |
Finishing
Concrete screws normally are plated in zinc with yellow or blue or white color , and sometimes dacromet for applications in sea .
Zinc
The most popular plating for the most products , making parts are bright and smooth and resistant corrosion
Dacromet
This finish is grey color with High corrosion resistance , No hydrogen embrittlement ,Heat resistance ,Easy to plated more ,eco-friendly etc charictersitics and the film thickness is 4-8μm ; Its used for Heavy-load truck ,engine ,Marine equipments etc
Material
Carbon steel with model 1018 , 1022 , 1035 , 1045 , SCM 435 and 40CRO
Stainless steel with model SUS 201 , SUS303 , SUS 304 ,SUS 316 , SUS 416 ,SUS 430 and SUS 420 .
Applications
Concrete screws are used for buildings like window frame , door etc that into concrete material .
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