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  • Concealed-head standoffs - CSOS, CSS
  • CSS_CSOS_Installed
  • Stainless Steel Standoffs - Types CSS, CSOS 2
These standoffs ensure permanent mounting in metal sheets as thin as 1.60mm.

The fastener head is locked securely in a blind, milled hole and is able to handle substantial loads. The concealed-head feature allows the side of the sheet opposite installation to remain smooth.

Sheet preparation only requires a milled blind hole to the recommended minimum depth. Center-cutting end mills for hole preparation are available from PennEngineering. Installation of the concealed-head studs and standoffs is simple using a hollow anvil and solid punch. Place the head of the fastener in the hole and insert using any standard press. Displaced sheet metal flows smoothly around the head into the undercut.
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Part #

Thread Size x Pitch

Style

Shank

Blind Mounting Hole Diameter + 0.08

L - Length + 0.05 –0.13

A Max.

B Max.

C Max.

Min. Depth Full Thread F

CAD

N/A M3 x 0.5 N/A #1 N/A Short N/A 5.41 mm N/A 4 mm N/A 1.04 mm N/A 4.20 mm N/A 5.39 mm N/A 5 mm N/A
N/A M4 x 0.7 N/A #1 N/A Short N/A 7.92 mm N/A 4 mm N/A 1.04 mm N/A 6.23 mm N/A 7.9 mm N/A 6.5 mm N/A
N/A M5 x 0.8 N/A #1 N/A Short N/A 8.74 mm N/A 4 mm N/A 1.04 mm N/A 7.37 mm N/A 8.72 mm N/A 9.6 mm N/A
N/A M3 x 0.5 N/A #1 N/A Short N/A 5.41 mm N/A 6 mm N/A 1.04 mm N/A 4.20 mm N/A 5.39 mm N/A 5 mm N/A
N/A M4 x 0.7 N/A #1 N/A Short N/A 7.92 mm N/A 6 mm N/A 1.04 mm N/A 6.23 mm N/A 7.9 mm N/A 6.5 mm N/A
N/A M5 x 0.8 N/A #1 N/A Short N/A 8.74 mm N/A 6 mm N/A 1.04 mm N/A 7.37 mm N/A 8.72 mm N/A 9.6 mm N/A
N/A M3 x 0.5 N/A #2 N/A Short N/A 5.41 mm N/A 8 mm N/A 1.04 mm N/A 4.20 mm N/A 5.39 mm N/A 5 mm N/A
N/A M4 x 0.7 N/A #2 N/A Short N/A 7.92 mm N/A 8 mm N/A 1.04 mm N/A 6.23 mm N/A 7.9 mm N/A 6.5 mm N/A
N/A M5 x 0.8 N/A #1 N/A Short N/A 8.74 mm N/A 8 mm N/A 1.04 mm N/A 7.37 mm N/A 8.72 mm N/A 9.6 mm N/A
N/A M3 x 0.5 N/A #3 N/A Short N/A 5.41 mm N/A 10 mm N/A 1.04 mm N/A 4.20 mm N/A 5.39 mm N/A 5 mm N/A
N/A M4 x 0.7 N/A #2 N/A Short N/A 7.92 mm N/A 10 mm N/A 1.04 mm N/A 6.23 mm N/A 7.9 mm N/A 6.5 mm N/A
N/A M5 x 0.8 N/A #2 N/A Short N/A 8.74 mm N/A 10 mm N/A 1.04 mm N/A 7.37 mm N/A 8.72 mm N/A 9.6 mm N/A
N/A M3 x 0.5 N/A #3 N/A Short N/A 5.41 mm N/A 12 mm N/A 1.04 mm N/A 4.20 mm N/A 5.39 mm N/A 5 mm N/A
N/A M4 x 0.7 N/A #3 N/A Short N/A 7.92 mm N/A 12 mm N/A 1.04 mm N/A 6.23 mm N/A 7.9 mm N/A 6.5 mm N/A
N/A M5 x 0.8 N/A #2 N/A Short N/A 8.74 mm N/A 12 mm N/A 1.04 mm N/A 7.37 mm N/A 8.72 mm N/A 9.6 mm N/A
N/A M3 x 0.5 N/A #3 N/A Short N/A 5.41 mm N/A 16 mm N/A 1.04 mm N/A 4.20 mm N/A 5.39 mm N/A 5 mm N/A
N/A M4 x 0.7 N/A #3 N/A Short N/A 7.92 mm N/A 16 mm N/A 1.04 mm N/A 6.23 mm N/A 7.9 mm N/A 6.5 mm N/A
N/A M5 x 0.8 N/A #3 N/A Short N/A 8.74 mm N/A 16 mm N/A 1.04 mm N/A 7.37 mm N/A 8.72 mm N/A 9.6 mm N/A
N/A M3 x 0.5 N/A #3 N/A Short N/A 5.41 mm N/A 20 mm N/A 1.04 mm N/A 4.20 mm N/A 5.39 mm N/A 5 mm N/A
N/A M4 x 0.7 N/A #3 N/A Short N/A 7.92 mm N/A 20 mm N/A 1.04 mm N/A 6.23 mm N/A 7.9 mm N/A 6.5 mm N/A
N/A M5 x 0.8 N/A #3 N/A Short N/A 8.74 mm N/A 20 mm N/A 1.04 mm N/A 7.37 mm N/A 8.72 mm N/A 9.6 mm N/A
N/A M3 x 0.5 N/A #3 N/A Short N/A 5.41 mm N/A 25 mm N/A 1.04 mm N/A 4.20 mm N/A 5.39 mm N/A 5 mm N/A
N/A M4 x 0.7 N/A #3 N/A Short N/A 7.92 mm N/A 25 mm N/A 1.04 mm N/A 6.23 mm N/A 7.9 mm N/A 6.5 mm N/A
N/A M5 x 0.8 N/A #3 N/A Short N/A 8.74 mm N/A 25 mm N/A 1.04 mm N/A 7.37 mm N/A 8.72 mm N/A 9.6 mm N/A
N/A M3 x 0.5 N/A #1 N/A Long N/A 5.41 mm N/A 4 mm N/A 1.83 mm N/A 4.20 mm N/A 5.39 mm N/A 5 mm N/A
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