Technical Design Information - Heat Staking Design Guidelines
Staking a hollow boss
produces a large, strong head without having to melt a large amount of material.
Also, the hollow stake avoids sink mark on the opposite side of the component
and enables the parts to be reassembled with self-tapping screws should repair
and disassembly be necessary. 
The knurled stake is used in those staking applications
where appearance is not critical. Since alignment is not an important consideration,
the knurled stake is ideally suited for high volume production. Knurled tips are
available in a variety of fine, medium and coarse configurations. 
The flush stake is used for applications requiring a
flush surface. The flush stake requires that the retained piece has sufficient
thickness for a chamfer or counterbore. 
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