Self Tapping Thread M4.5 Pan Washer Head Screws for Sheet Metal
Galvanized Steel
Self tapping threads pan wafer head .sheet metal screws
Phillips drive head with NO.2
Material : Harden Steel
Sheet metal screws are made from harden steel with anneal treatment
to secure metal sheets , 30 degree full tapping threads to the
bottom of the head and bigger washer head diameter than shaft can
secure metal sheets more tight .
● High tensile strength
● Fast drilling threads
● Labor efficient
● Torsional resistance
● Easy operation
Specification
| Thread diameter | 4.5 |
| Thread length | 20 |
| Head diameter | 13 |
| Head height | 3.2 |
| Core hardness | HV350 |
| Case hardness | HV500 |
| finishing | Blue zinc |
| Available sheet thickness | 3.2 |
Material
Sheet metal screws are normally made from harden steel material
with grade 6.8 to 8.8 . it is available for other materials
Carbon steel : 1018 , 1022 , 1035 , 1045 , SCM 435
stainless steel SUS 201 , SUS303 , SUS 304 ,SUS 316 , SUS 416 ,SUS
430 and SUS 420 .
When a sheet metal screw is used for securing sheets , the
thickness of sheet metal has to be suitable for screw or sheet
metal screws can not drill into sheet or be broken .
| d | 6# ( 3.5 ) | 7# ( 3.9 ) | 8# ( 4.2 ) | 10# (4.8 ) | 12# ( 5.5 ) | 14# ( 6.3 ) |
| Sheet thickness | 1.85-1.95 | 3.12-3.23 | 4.68-4.84 |
| Hole Dia. | 2.95 | 3.26 | 3.45 | 4.04 | 4.76 | 5.5 |
| Hole tolerance | ±0.025 | ±0.025 | ±0.025 | ±0.025 | ±0.025 | ±0.025 |
Generally , sheet metal screws are plated in white ,blue and yellow zinc on the surface , you can choose more finishing
according to requests .
| Finishing | Colors | Thickness | Charicteristic |
| Zinc | Blue ,White ,Black ,Yellow | 5-17μm | Bright and smooth surface ,corrosion resistance |
| Nickel | Silver | 1～3μm | Wear resistance ,bright appearance , anti-corrosion |
| Polishing | Silver | 0.01mm ( reference ) | Improving brightness of surface |
| Tin | Silver | 0.13～1.27μm | Good ductility ,corrosion resistance ,lower melting point
,eco-friendly ,brightness |
| Brass | Copper | 5gm～8gm | Good dispersibility ,Bright appearance |
| Dacromet | Grey | 4-8μm | High corrosion resistance , No hydrogen embrittlement ,Heat
resistance ,Easy to plated more ,eco-friendly |
| Chrome | Silver white | 0．25～0．5μm | Harden surface ,Bright surface ,Heat resistance ,Wear resistance
Corrosion resistance and eco-friendly
|
Application
Sheet metal screws are normally applied to metal sheets those are
used for
▲ Metal panels
▲ Metal proof
▲ Windows
▲ Doors
▲ Barrier
▲ Aluminum pipes
Features for Sheet Metal Screws
◆ Partial threads
◆ High torsinal strength
◆ Harden material
◆ Good drilling point
◆ Heavy Loading
◆ Eco-friendly
