Zygology
Zygology Ltd
Unit 7, Thame 40 Jane Morbey Road
Thame Oxon OX9 3RR
Phone: 0808 123 1221
Fax: +44 1844 266021
Email: sales@zygology.com
Web Address: www.zygology.com
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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.
Concealed-head standoffs - CSOS, CSS
Stainless Steel Standoffs - Types CSS, CSOS 2
Unit of Measure
1 2 3 4 

Item #

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

CSOS-440-5 N/A .112-40 (#4-40) N/A #2 N/A Long N/A .213 in N/A .312 in N/A .072 in N/A .165 in N/A .212 in N/A CAD Icon (for items table) N/A .188 in
CSOS-632-5 N/A .138-32 (#6-32) N/A #2 N/A Long N/A .290 in N/A .312 in N/A .072 in N/A .213 in N/A .289 in N/A CAD Icon (for items table) N/A .250 in
CSOS-832-5 N/A .164-32 (#8-32) N/A #2 N/A Long N/A .312 in N/A .312 in N/A .072 in N/A .245 in N/A .311 in N/A CAD Icon (for items table) N/A .250 in
CSOS-032-5 N/A .190-32 (#10-32) N/A #1 N/A Long N/A .344 in N/A .312 in N/A .072 in N/A .290 in N/A .343 in N/A CAD Icon (for items table) N/A .375 in
CSOS-0420-5 N/A .250-20 (1/4-20) N/A #1 N/A Long N/A .390 in N/A .312 in N/A .072 in N/A .354 in N/A .389 in N/A CAD Icon (for items table) N/A .375 in
CSOS-440-6 N/A .112-40 (#4-40) N/A #2 N/A Long N/A .213 in N/A .375 in N/A .072 in N/A .165 in N/A .212 in N/A CAD Icon (for items table) N/A .188 in
CSOS-632-6 N/A .138-32 (#6-32) N/A #2 N/A Long N/A .290 in N/A .375 in N/A .072 in N/A .213 in N/A .289 in N/A CAD Icon (for items table) N/A .250 in
CSOS-832-6 N/A .164-32 (#8-32) N/A #2 N/A Long N/A .312 in N/A .375 in N/A .072 in N/A .245 in N/A .311 in N/A CAD Icon (for items table) N/A .250 in
CSOS-032-6 N/A .190-32 (#10-32) N/A #1 N/A Long N/A .344 in N/A .375 in N/A .072 in N/A .290 in N/A .343 in N/A CAD Icon (for items table) N/A .375 in
CSOS-0420-6 N/A .250-20 (1/4-20) N/A #1 N/A Long N/A .390 in N/A .375 in N/A .072 in N/A .354 in N/A .389 in N/A CAD Icon (for items table) N/A .375 in
CSOS-440-8 N/A .112-40 (#4-40) N/A #3 N/A Long N/A .213 in N/A .500 in N/A .072 in N/A .165 in N/A .212 in N/A CAD Icon (for items table) N/A .188 in
CSOS-632-8 N/A .138-32 (#6-32) N/A #3 N/A Long N/A .290 in N/A .500 in N/A .072 in N/A .213 in N/A .289 in N/A CAD Icon (for items table) N/A .250 in
CSOS-832-8 N/A .164-32 (#8-32) N/A #3 N/A Long N/A .312 in N/A .500 in N/A .072 in N/A .245 in N/A .311 in N/A CAD Icon (for items table) N/A .250 in
CSOS-032-8 N/A .190-32 (#10-32) N/A #2 N/A Long N/A .344 in N/A .500 in N/A .072 in N/A .290 in N/A .343 in N/A CAD Icon (for items table) N/A .375 in
CSOS-0420-8 N/A .250-20 (1/4-20) N/A #2 N/A Long N/A .390 in N/A .500 in N/A .072 in N/A .354 in N/A .389 in N/A CAD Icon (for items table) N/A .375 in
CSOS-440-10 N/A .112-40 (#4-40) N/A #3 N/A Long N/A .213 in N/A .625 in N/A .072 in N/A .165 in N/A .212 in N/A CAD Icon (for items table) N/A .188 in
CSOS-632-10 N/A .138-32 (#6-32) N/A #3 N/A Long N/A .290 in N/A .625 in N/A .072 in N/A .213 in N/A .289 in N/A CAD Icon (for items table) N/A .250 in
CSOS-832-10 N/A .164-32 (#8-32) N/A #3 N/A Long N/A .312 in N/A .625 in N/A .072 in N/A .245 in N/A .311 in N/A CAD Icon (for items table) N/A .250 in
CSOS-032-10 N/A .190-32 (#10-32) N/A #3 N/A Long N/A .344 in N/A .625 in N/A .072 in N/A .290 in N/A .343 in N/A CAD Icon (for items table) N/A .375 in
CSOS-0420-10 N/A .250-20 (1/4-20) N/A #2 N/A Long N/A .390 in N/A .625 in N/A .072 in N/A .354 in N/A .389 in N/A CAD Icon (for items table) N/A .375 in
CSOS-440-12 N/A .112-40 (#4-40) N/A #3 N/A Long N/A .213 in N/A .750 in N/A .072 in N/A .165 in N/A .212 in N/A CAD Icon (for items table) N/A .188 in
CSOS-632-12 N/A .138-32 (#6-32) N/A #3 N/A Long N/A .290 in N/A .750 in N/A .072 in N/A .213 in N/A .289 in N/A CAD Icon (for items table) N/A .250 in
CSOS-832-12 N/A .164-32 (#8-32) N/A #3 N/A Long N/A .312 in N/A .750 in N/A .072 in N/A .245 in N/A .311 in N/A CAD Icon (for items table) N/A .250 in
CSOS-032-12 N/A .190-32 (#10-32) N/A #3 N/A Long N/A .344 in N/A .750 in N/A .072 in N/A .290 in N/A .343 in N/A CAD Icon (for items table) N/A .375 in
CSOS-0420-12 N/A .250-20 (1/4-20) N/A #3 N/A Long N/A .390 in N/A .750 in N/A .072 in N/A .354 in N/A .389 in N/A CAD Icon (for items table) N/A .375 in
Unit of Measure
1 2 3 4