The installation of Lee Betaplugs, whether performed manually or automatically, is very easy and economical. First, the preassembled Betaplug is inserted into the tapered installation hole narrow end first. The pin is then driven into the plug using the recommended Lee Company Installation/Staking Tool until the pin is below flush while staking over the back edge of the plug.
For 6000 Series Betaplugs the pin should be installed 0.38 to 0.46mm (0.015" to 0.018") below flush.
The installation hole for a 6000 Series Lee Betaplug has an included taper angle, Beta, of 4.3°, which matches the tapered outside diameter of the Betaplug. This included draft angle of 4.3° is very easy to achieve with a core pin in a die-cast or molded part or to machine using a tapered tool.
A tolerance of ±0.3° on the taper angle of 4.3° is specified to guarantee that the Betaplug’s rated performance is achieved. If the taper angles are out of tolerance, the plug will either wedge first at the top or at the bottom, reducing sealing burst pressure. Tapered reamers are available for each size Betaplug. See the tooling table for applicable part numbers.
The Lee Company recommends that the Betaplug be installed below the surface of the housing to ensure maximum plug retention capability. The use of coatings or surface treatments in the area of the installation hole where the Betaplug is to be installed is not recommended.
|BETAPLUG SIZE||TOP GAGE DIA.,
|BOTTOM GAGE DIA.,
|MAX. PASSAGE DIA.,
|MIN. WALL THICKNESS,
|MIN. GAGE DEPTH,
* Depth of tapered hole (L3) from depth of minimum diameter (D4).
All dimensions are in millimeters.
Lee Installation/Staking Tools are available for each Betaplug and part numbers are listed in the tooling table.
The tool contains a centering feature which ensures proper tool alignment during installation. All Betaplug pins are coated with a wax that produces a thin, solid lubricating film that reduces friction, allowing the pin to be driven to its correct position relative to the plug. Do not clean prior to installation.
The installation force required to drive the pin into the Betaplug is a function of boss material, installation hole and boss geometry, and plug size. A boss made of a stronger material or having a larger wall thickness will require a greater installation force than one made of a weaker material or having thinner walls. Typical installation forces for A380 die-cast aluminum are listed for each Betaplug. See the tooling table below.
|4||PLBT0470030S||PLBT0470020S||2.9 (650 lbf)|
|5||PLBT0570031S||PLBT0570020S||2.4 (550 lbf)|
|6||PLBT0670031S||PLBT0670020S||2.6 (600 lbf)|
|7||PLBT0770030S||PLBT0770020S||4.0 (900 lbf)|
|8||PLBT0870030S||PLBT0870020S||4.4 (1,000 lbf)|