Catalog
Stainless Steel Standoffs - Types CSS, CSOS - Unified
Concealed-Head Standoffs – Types CSOS, CSS
These standoffs ensure permanent mounting in metal sheets as thin as .062 in.
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.
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.
Part # |
Thread Size |
Style |
Shank |
Blind Mounting Hole Diameter + .003 - .000 |
L - Length + .002 –.005 |
A Max. |
B Max. |
C Max. |
CAD |
Min. Depth Full Thread F |
|---|---|---|---|---|---|---|---|---|---|---|
| CSS-440-3 | Thread Size N/A .112-40 (#4-40) | Style N/A #1 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .213 in | L - Length + .002 –.005 N/A .187 in | A Max. N/A .041 in | B Max. N/A .165 in | C Max. N/A .212 in |
CAD
N/A 
|
Min. Depth Full Thread F N/A .188 in |
| CSS-632-3 | Thread Size N/A .138-32 (#6-32) | Style N/A #1 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .290 in | L - Length + .002 –.005 N/A .187 in | A Max. N/A .041 in | B Max. N/A .213 in | C Max. N/A .289 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .250 in |
| CSS-832-3 | Thread Size N/A .164-32 (#8-32) | Style N/A #1 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .312 in | L - Length + .002 –.005 N/A .187 in | A Max. N/A .041 in | B Max. N/A .245 in | C Max. N/A .311 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .250 in |
| CSS-032-3 | Thread Size N/A .190-32 (#10-32) | Style N/A #1 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .344 in | L - Length + .002 –.005 N/A .187 in | A Max. N/A .041 in | B Max. N/A .290 in | C Max. N/A .343 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .375 in |
| CSS-0420-3 | Thread Size N/A .250-20 (1/4-20) | Style N/A #1 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .390 in | L - Length + .002 –.005 N/A .187 in | A Max. N/A .041 in | B Max. N/A .354 in | C Max. N/A .389 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .375 in |
| CSS-440-4 | Thread Size N/A .112-40 (#4-40) | Style N/A #2 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .213 in | L - Length + .002 –.005 N/A .250 in | A Max. N/A .041 in | B Max. N/A .165 in | C Max. N/A .212 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .188 in |
| CSS-632-4 | Thread Size N/A .138-32 (#6-32) | Style N/A #1 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .290 in | L - Length + .002 –.005 N/A .250 in | A Max. N/A .041 in | B Max. N/A .213 in | C Max. N/A .289 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .250 in |
| CSS-832-4 | Thread Size N/A .164-32 (#8-32) | Style N/A #1 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .312 in | L - Length + .002 –.005 N/A .250 in | A Max. N/A .041 in | B Max. N/A .245 in | C Max. N/A .311 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .250 in |
| CSS-032-4 | Thread Size N/A .190-32 (#10-32) | Style N/A #1 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .344 in | L - Length + .002 –.005 N/A .250 in | A Max. N/A .041 in | B Max. N/A .290 in | C Max. N/A .343 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .375 in |
| CSS-0420-4 | Thread Size N/A .250-20 (1/4-20) | Style N/A #1 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .390 in | L - Length + .002 –.005 N/A .250 in | A Max. N/A .041 in | B Max. N/A .354 in | C Max. N/A .389 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .375 in |
| CSS-440-5 | Thread Size N/A .112-40 (#4-40) | Style N/A #2 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .213 in | L - Length + .002 –.005 N/A .312 in | A Max. N/A .041 in | B Max. N/A .165 in | C Max. N/A .212 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .188 in |
| CSS-632-5 | Thread Size N/A .138-32 (#6-32) | Style N/A #2 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .290 in | L - Length + .002 –.005 N/A .312 in | A Max. N/A .041 in | B Max. N/A .213 in | C Max. N/A .289 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .250 in |
| CSS-832-5 | Thread Size N/A .164-32 (#8-32) | Style N/A #2 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .312 in | L - Length + .002 –.005 N/A .312 in | A Max. N/A .041 in | B Max. N/A .245 in | C Max. N/A .311 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .250 in |
| CSS-032-5 | Thread Size N/A .190-32 (#10-32) | Style N/A #1 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .344 in | L - Length + .002 –.005 N/A .312 in | A Max. N/A .041 in | B Max. N/A .290 in | C Max. N/A .343 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .375 in |
| CSS-0420-5 | Thread Size N/A .250-20 (1/4-20) | Style N/A #1 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .390 in | L - Length + .002 –.005 N/A .312 in | A Max. N/A .041 in | B Max. N/A .354 in | C Max. N/A .389 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .375 in |
| CSS-440-6 | Thread Size N/A .112-40 (#4-40) | Style N/A #2 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .213 in | L - Length + .002 –.005 N/A .375 in | A Max. N/A .041 in | B Max. N/A .165 in | C Max. N/A .212 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .188 in |
| CSS-632-6 | Thread Size N/A .138-32 (#6-32) | Style N/A #2 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .290 in | L - Length + .002 –.005 N/A .375 in | A Max. N/A .041 in | B Max. N/A .213 in | C Max. N/A .289 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .250 in |
| CSS-832-6 | Thread Size N/A .164-32 (#8-32) | Style N/A #2 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .312 in | L - Length + .002 –.005 N/A .375 in | A Max. N/A .041 in | B Max. N/A .245 in | C Max. N/A .311 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .250 in |
| CSS-032-6 | Thread Size N/A .190-32 (#10-32) | Style N/A #1 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .344 in | L - Length + .002 –.005 N/A .375 in | A Max. N/A .041 in | B Max. N/A .290 in | C Max. N/A .343 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .375 in |
| CSS-0420-6 | Thread Size N/A .250-20 (1/4-20) | Style N/A #1 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .390 in | L - Length + .002 –.005 N/A .375 in | A Max. N/A .041 in | B Max. N/A .354 in | C Max. N/A .389 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .375 in |
| CSS-440-8 | Thread Size N/A .112-40 (#4-40) | Style N/A #3 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .213 in | L - Length + .002 –.005 N/A .500 in | A Max. N/A .041 in | B Max. N/A .165 in | C Max. N/A .212 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .188 in |
| CSS-632-8 | Thread Size N/A .138-32 (#6-32) | Style N/A #3 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .290 in | L - Length + .002 –.005 N/A .500 in | A Max. N/A .041 in | B Max. N/A .213 in | C Max. N/A .289 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .250 in |
| CSS-832-8 | Thread Size N/A .164-32 (#8-32) | Style N/A #3 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .312 in | L - Length + .002 –.005 N/A .500 in | A Max. N/A .041 in | B Max. N/A .245 in | C Max. N/A .311 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .250 in |
| CSS-032-8 | Thread Size N/A .190-32 (#10-32) | Style N/A #2 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .344 in | L - Length + .002 –.005 N/A .500 in | A Max. N/A .041 in | B Max. N/A .290 in | C Max. N/A .343 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .375 in |
| CSS-0420-8 | Thread Size N/A .250-20 (1/4-20) | Style N/A #2 | Shank N/A Short | Blind Mounting Hole Diameter + .003 - .000 N/A .390 in | L - Length + .002 –.005 N/A .500 in | A Max. N/A .041 in | B Max. N/A .354 in | C Max. N/A .389 in |
CAD
N/A
|
Min. Depth Full Thread F N/A .375 in |
