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 studs 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.
Concealed head studs- CFHA, CFHC, CHA, CHC
Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC 2
Unit of Measure
1 2 3 

Item #

Thread Size x Pitch

Blind Mounting Hole Diameter + 0.08

L - Length ± 0.4

E ± 0.25

C Max.

Fastener Material

Standard Finish

CAD

CHA-M3-6 N/A M3 x 0.5 N/A 4.37 mm N/A 6 mm N/A 5.21 mm N/A 4.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M4-6 N/A M4 x 0.7 N/A 7.37 mm N/A 6 mm N/A 8.33 mm N/A 7.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M3-8 N/A M3 x 0.5 N/A 4.37 mm N/A 8 mm N/A 5.21 mm N/A 4.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M4-8 N/A M4 x 0.7 N/A 7.37 mm N/A 8 mm N/A 8.33 mm N/A 7.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M3-10 N/A M3 x 0.5 N/A 4.37 mm N/A 10 mm N/A 5.21 mm N/A 4.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M4-10 N/A M4 x 0.7 N/A 7.37 mm N/A 10 mm N/A 8.33 mm N/A 7.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M5-10 N/A M5 x 0.8 N/A 7.93 mm N/A 10 mm N/A 8.89 mm N/A 7.9 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M3-12 N/A M3 x 0.5 N/A 4.37 mm N/A 12.00 mm N/A 5.21 mm N/A 4.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M4-12 N/A M4 x 0.7 N/A 7.37 mm N/A 12.00 mm N/A 8.33 mm N/A 7.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M5-12 N/A M5 x 0.8 N/A 7.93 mm N/A 12.00 mm N/A 8.89 mm N/A 7.9 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M3-16 N/A M3 x 0.5 N/A 4.37 mm N/A 16 mm N/A 5.21 mm N/A 4.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M4-16 N/A M4 x 0.7 N/A 7.37 mm N/A 16 mm N/A 8.33 mm N/A 7.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M5-16 N/A M5 x 0.8 N/A 7.93 mm N/A 16 mm N/A 8.89 mm N/A 7.9 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M3-20 N/A M3 x 0.5 N/A 4.37 mm N/A 20 mm N/A 5.21 mm N/A 4.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M4-20 N/A M4 x 0.7 N/A 7.37 mm N/A 20 mm N/A 8.33 mm N/A 7.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M5-20 N/A M5 x 0.8 N/A 7.93 mm N/A 20 mm N/A 8.89 mm N/A 7.9 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M4-25 N/A M4 x 0.7 N/A 7.37 mm N/A 25.00 mm N/A 8.33 mm N/A 7.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CHA-M5-25 N/A M5 x 0.8 N/A 7.93 mm N/A 25.00 mm N/A 8.89 mm N/A 7.9 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CFHA-M3-6 N/A M3 x 0.5 N/A 4.37 mm N/A 6 mm N/A 5.21 mm N/A 4.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CFHA-M4-6 N/A M4 x 0.7 N/A 7.37 mm N/A 6 mm N/A 8.33 mm N/A 7.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CFHA-M3-8 N/A M3 x 0.5 N/A 4.37 mm N/A 8 mm N/A 5.21 mm N/A 4.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CFHA-M4-8 N/A M4 x 0.7 N/A 7.37 mm N/A 8 mm N/A 8.33 mm N/A 7.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CFHA-M3-10 N/A M3 x 0.5 N/A 4.37 mm N/A 10 mm N/A 5.21 mm N/A 4.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CFHA-M4-10 N/A M4 x 0.7 N/A 7.37 mm N/A 10 mm N/A 8.33 mm N/A 7.35 mm N/A Aluminum N/A N/A CAD Icon (for items table)
CFHA-M5-10 N/A M5 x 0.8 N/A 7.93 mm N/A 10 mm N/A 8.89 mm N/A 7.9 mm N/A Aluminum N/A N/A CAD Icon (for items table)
Unit of Measure
1 2 3