Ball expansion plugs are metallic sealing elements designed for the permanent sealing of machined holes in mechanical, hydraulic, and pneumatic components.
Their operating principle is based on the controlled expansion of the plug body through the insertion of an internal ball. During installation the ball is driven into the expanding sleeve, creating strong mechanical anchoring against the hole walls and ensuring reliable sealing without threading, welding, or sealing compounds.
Compared with traditional threaded plugs, expansion sealing plugs significantly reduce production time by eliminating operations such as tapping, welding, or applying sealing compounds.
EIS 31 sealing plugs consist of:
- sleeve in stainless steel AISI 303
- ball in heat treated bearing steel.
The EIS 31 series represents an intermediate technical solution within the standard range (EIS 33, EIS 31, and EIS 11). Thanks to the stainless steel sleeve it provides good corrosion resistance, while the hardened steel ball ensures high mechanical performance.
EIS 31 plugs ensure high sealing performance even under demanding conditions. They can be used as hydraulic sealing plugs for circuits up to 450 bar, making them ideal for hydraulic pumps, pneumatic systems, engines, and machine tools.
Installation can be performed manually with a hammer or using a press. For optimal performance, the use of dedicated HT installation tools is recommended to ensure correct ball insertion and uniform expansion of the plug inside the hole.
Available for sealing machined holes from Ø3 to Ø22 mm.
Custom inch sizes, materials, and special surface treatments are available upon request.
Bouchons d’expansion à bille (Inox + Acier), 450 bar
DOCUMENTATION
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