Corrosion protection.
The coating of the Mage-Powell Gee self drilling screw is a
vital factor in its useful lifespan.
Dural 250 PLUS Coating
What does this mean? This is a brand name for the anti-corrosion
coating which protects all Mage- Powell Gee self drilling screws,
and will resist up to 250 hours salt spray test.
Dural 250 PLUS is a high technology coating, mainly consisting
of epoxy resin containing finely dispersed zinc and aluminium
particles.
Production Process
The pre-hardened screws are coated by a dip, spin, bake process
with oven temperatures not exceeding 200°C. This produces
a multi-layered, scratch resistant coating.
The process is also environmentally sensitive as it does not
use any contaminated waste product such as the Cr6 poison, unavoidable
in certain galvanising/electro plating processes.
How does Dural 250 Plus compare to other coatings
Mage-Powell Gee self drilling screws undergo 2 tests to determine
the quality of the corrosion protection.
The Salt Spray Test (DIN 50021 SS) Used to test how long a screw
can resist an aggressive salt spray environment before corroding.
The Kesternich Test (DIN 50018) Used to test how long a screw
can resist an aggressive acid based industrial environment.
|
 |
BZP
Salt Spray Test
Zinc + Yellow
Salt Spray Test
Dural 250
Salt Spray Test
Please note that the following figures have been achieved under laboratory conditions and do not allow for any safety factors.
Testing cannot take into consideration all possible combinations of screws and materials
|
Torsional Strength
|
 |
ISO No.
Ø (mm) |
ISO No.6
3.5 |
ISO No.8
4.2 |
ISO No.10
4.8 |
ISO No.12
5.5 |
ISO No.14 6.3 |
Inch - lbs
|
25 |
42.5 |
84 |
130 |
150 |
Nm
|
2.8 |
4.8 |
7.0 |
10.5 |
17.0 |
Pull-out Strength
|
 |
Screw Style¹ |
Drill-Point No. 1 |
Steel Thickness
mm |
0.63 |
1.00 |
1.25 |
| LBS |
190 |
360 |
495 |
| kN |
0.85 |
1.60 |
2.19 |
| Screw Style² |
Drill-Point No. 2 |
Steel Thickness
mm |
1.0 |
1.5 |
2.0 |
2.5 |
3.0 |
| LBS |
280 |
505 |
790 |
1080 |
1370 |
| kN |
1.25 |
2.25 |
3.50 |
4.80 |
6.1 |
| Screw Style² |
Drill-Point No. 5 |
Steel Thickness
mm |
5.0 |
6.0 |
| LBS |
2520 |
3360* |
| kN |
11.21 |
15.0* |
| Screw Style |
Timber Sub-structure |
| Ø Length |
6.0 x 25mm |
6.0 x 32mm |
6.0 x 45mm |
| LBS |
470 |
530 |
790 |
| kN |
2.10 |
2.35 |
3.52 |
|
|
Pull-over values
(With 16mm washer)
|
 |
Steel Thickness
mm |
lbs |
kn |
| 0.63 |
1085 |
4.85 |
| 0.75 |
1330 |
5.95 |
| 1.00 |
1930 |
8.62 |
| 1.25 |
2195 |
9.79 |
Shear Strength
|
 |
ISO No.
Ø (mm) |
ISO No.6
3.5 |
ISO No.8
4.2 |
ISO No.10
4.8 |
ISO No.12
5.5 |
ISO No.14
6.3 |
| lbs |
660 |
980 |
1400 |
1880 |
2760 |
| kN |
2.93 |
4.36 |
6.28 |
8.36 |
12.27 |
Tensile Strength
|
 |
ISO No.
Ø (mm) |
ISO No.6
3.5 |
ISO No.8
4.2 |
ISO No.10
4.8 |
ISO No.12
5.5 |
ISO
No.14
6.3 |
| lbs |
1125 |
1570 |
2250 |
3158 |
3850 |
| kN |
5.0 |
7.0 |
10.0 |
14.1 |
17.2 |
Recommended Drill Speed
|
| Recommended drill speed for screw guns under
axial load |
| Screw Diameter |
Minimum |
Maximum |
up to Ø 4.8
up to Ø 5.5
up to Ø 6.3 |
1800
1000
1000 |
2200
1600
1600 |
* Over 6mm limited due to Tensile Strength.
¹ Values refer to diameter 4.8mm.
² Values refer to diameter 5.5mm.
Test results have been obtained in conjunction with St-37 steel by an independent test laboratory.
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