Screw 7553
- Type:
- Self-drilling
- Material:
- Bimetal
Stainless steel screw with carbon drill point - Insert:
-
For outdoor and indoor use with high humidity
For fastening trapezoidal sheets - Substructure:
- Profiles
- Length:
- 20 - 22 mm
- Steel thickness:
- 1 - 2,5 mm
- Screw head ⌀:
- 10,5 mm
- Thread diameter ⌀:
- 4,8 mm
Variants
| Length [mm] |
Sealing washer [mm] |
Insulation [mm] |
Article no. | price |
|---|---|---|---|---|
| 20 | 14 | 1 | 755348020E14K | R 24,97 |
| 20 | 16 | 1 | 755348020E16K | R 25,21 |
| 22 | 16 | 1 | 755355022E16K | R 26,33 |
Product description
The 7553 screw is a short hexagonal bi-metal screw with a back-seam, designed for joining overlapping sheets and for fixing channel sections. The countersink pulls the two sheets tightly together, ensuring the joint closes cleanly and without a gap. This makes it particularly suitable for tight, form-fit sheet metal joints on thin material.
7553 Hex Bimetal Self-tapping Screw A2
SW 8
with countersink
reduced drill tip No. 1
Sealing washer A2
for joining trapezoidal sheets (overlap 2 x 1.0 mm) Drilling capacity ∑ ≤ 2.5 mm
Typical applications
The 7553 screw is used wherever two sheets need to be firmly joined together. Typical applications include:
- Joining overlapping trapezoidal sheets at the seam
- Fixing edge profiles to thin material
- Use on walls and roofs
- Outdoor applications and indoor areas with high humidity
The screw is designed as a self-tapping bi-metal A2 screw with a hexagonal head (SW 8) and a countersink, featuring a reduced drill point and an A2 sealing washer. It is available in lengths of 20 mm and 22 mm and is designed for material thicknesses of 1 to 2.5 mm. For roof applications, it is approved with and without a cap.
When should you choose this screw?
The 7553 screw is the right choice when two sheets need to be pulled together firmly and without a gap at the seam, as the countersink performs precisely this function. If the sole requirement is to fix full-threaded flanged profiles, the 7550 screw is suitable. For fixing trapezoidal sheets to the substructure, the 7110 or 7510 screws are recommended, depending on the thickness of the support. You can find an overview of all screws in the ‘Screws’ category.
Matching products
The 7553 screw is used in conjunction with sheets and profiles. Also suitable:
- Trapezoidal sheets for roofs and walls: Trapezoidal sheet range.
- Edge profiles for finishes and connections: Edge profiles.
- Screw 7550 as a fully threaded edge profile screw: Screw 7550.
You can find an overview of all accessories in our accessories section.
Frequently asked questions
What is the purpose of the back-seam on this screw?
The countersink pulls the two sheets to be joined tightly together as the screw is driven in. This ensures the seam closes without a gap, resulting in a particularly tight and form-fit joint.
How does the 7553 screw differ from the 7550?
Both are short hexagon head screws for thin material. The 7553 has a countersink and pulls metal sheets tightly together, whilst the 7550 screw has a full thread and is primarily designed for fastening channel sections.
In what lengths is the screw available?
The 7553 screw is available in lengths of 20 mm and 22 mm with a sealing washer. The correct choice depends on the material and the specific application. We’d be happy to advise you on this.
Do I need a cap on the roof?
For roof applications, the screw is approved for use with or without a cap. A cap is used when the screw is positioned in the high rib to improve the bearing surface. We’d be happy to advise you on the appropriate design.
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