Automotion Components Expansion Sealing Plugs
General Guidance
Hydraulic and pneumatic components and systems are often cross-drilled to provide the correct channels for air and gas. Some of these channels have to be drilled from the outside and later need to be closed off (plugged).
The expansions sealing plugs are inserted into a drilled hole and the expander ball is driven into the plug sleeve. The independent grooved sealing rings on the plug ball are driven into the housing material to permanently plug and seal the hole. The ball is retained in place.
No need for tapping or reaming, no machining of O ring grooves or the use of tapes or sealants.
Installation
Hole Preparation
Refer to the data sheet for the correct hole size to drill for the counterbored and drilled holesize and tolerance. Hole concentricity must be held within 0,05mm.
Bore roughness muct be between Rz (RMS) 10-30µ (especially for hard materials).
Avoid spiral or longitudinal grooves as these may affect plug performace. Ensure the holes are clean and dirt free.
Installation
Insert the plug into the counterbored hole with the ball facing outwards, seared against the counterbore shoulder.
Press the ball into the sleeve so that the top of the ball is slightly below the top of the sleeve (note approimate values for x and s in table below):
Use the correct installation tool for each plug size. The plugs can be installed using a hammer and the installation tool. An air hammer with the correct air installation tool can also be used.
| d1 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 12 | 14 | 16 | 18 | 20 | 22 |
| Stoke - S | 1,2 | 1,5 | 2,0 | 2,5 | 3,0 | 3,5 | 4,0 | 4,5 | 5,5 | 6,35 | 7,0 | 8,0 | 9,0 | 10,0 |
| Top of ball relative to top of sleeve - x ±0.2 | 0,4 | 0,2 | 0,4 | 0,4 | 0,4 | 0,3 | 0,4 | 0,4 | 0,4 | 0,4 | 0,6 | 0,6 | 0,8 | 0,8 |
Applications
Some of the typical applications for our sealing screws include:
- Pneumatics
- Hydraulics
- Fluid Power
- Automation
- Industrial
- Aerospace
- Valves
- Regulators
- Cylinders
"Standard" Expansion sealing plugs - push the ball which expands the sleeve and seals the channel
"Pull" Expansionsealing plugs. Pulling on the mandrel expands the sleeve, sealingthe channel. At a predetermined force the mandrel breaks off.
