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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.
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Concealed head studs- CFHA, CFHC, CHA, CHC

Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC - Metric
Concealed head studs- CFHA, CFHC, CHA, CHC

Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC - Metric
Concealed head studs- CFHA, CFHC, CHA, CHC

Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC - Metric
Concealed head studs- CFHA, CFHC, CHA, CHC

Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC - Metric
Concealed head studs- CFHA, CFHC, CHA, CHC

Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC - Metric
Thread Size x Pitch N/A M3 x 0.5 N/A M4 x 0.7 N/A M3 x 0.5 N/A M4 x 0.7 N/A M3 x 0.5
Thread Code N/A M3 N/A M4 N/A M3 N/A M4 N/A M3
Length Code N/A 6 N/A 6 N/A 8 N/A 8 N/A 10
Material Code N/A A
Min. Sheet Thickness N/A 1.6 mm
Blind Mounting Hole Diameter + 0.08 N/A 4.37 mm N/A 7.37 mm N/A 4.37 mm N/A 7.37 mm N/A 4.37 mm
Min. Depth of Blind Hole1 N/A 1.10 mm
L - Length ± 0.4
N/A 6 mm a1395.jpg N/A 6 mm a1395.jpg N/A 8 mm a1395.jpg N/A 8 mm a1395.jpg N/A 10 mm a1395.jpg
A Max. N/A 1.04 mm
E ± 0.25 N/A 5.21 mm N/A 8.33 mm N/A 5.21 mm N/A 8.33 mm N/A 5.21 mm
C Max. N/A 4.35 mm N/A 7.35 mm N/A 4.35 mm N/A 7.35 mm N/A 4.35 mm
Min. Dist. Hole C/L to Edge N/A 4 mm N/A 5.6 mm N/A 4 mm N/A 5.6 mm N/A 4 mm
Max. Hole in Attached Parts N/A 3.60 mm N/A 4.60 mm N/A 3.60 mm N/A 4.60 mm N/A 3.60 mm
For Use in Sheet Hardness2 N/A HRB 50 / HB 82 or less
Thread Specification N/A External, ANSI / ASME B1.13M, 6g
Fastener Material N/A Aluminum
Standard Finish N/A
CAD Supplier N/A PennEngineering® (PEM®)
  • 1 Blind holes may be deeper than minimums except where sheet material is at or near minimum thickness. Fasteners should always be installed so the flange is flush with the surface of the sheet.
  • 2 HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.