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

Part #

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 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 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 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 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 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