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PennEngineering
All Categories > PEM® Brand Fasteners for Metal Sheets and Panels > Sheet-to-Sheet Attachment > Panel to Panel, KEYHOLE® Style – Types SKC-F, SK4-F, SKS-R, SKC-R, , SKC-R > Panel to Panel, KEYHOLE® Style – Type SK4-R > SELF-CLINCHING KEYHOLE® FASTENERS - SK4-R™ - Unified > Part # SK4-R2.5-3.2  

Part # SK4-R2.5-3.2, SELF-CLINCHING KEYHOLE® FASTENERS - SK4-R™ - Unified

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PEM® KEYHOLE® Standoffs and sheet joining fasteners are designed so that a PC board or panel can be quickly slipped into place and then removed from an assembly by simply sliding the board sideways and lifting it off. These standoffs and fasteners can save valuable time and dramatically reduce the amount of loose hardware required.

Type SKS-R™ fasteners are designed so that two sheets can be quickly joined flat against each other. Typically, several fasteners are used with one standard PEM® threaded F™ flush nut which accepts a screw to secure the sheets against any unwanted movement.
  • Allow detachable spacing of two sheets
  • Clinch feature mounts fastener permanently and flush or sub-flush into metal sheet
  • Unique barrel design allows for quick “panel-on-panel” attachment and detachment
  • Can be clinched into blind hole where concealed head is required
  • Makes horizontal or vertical component mounting possible
  • SKS-R™ fasteners are designed to provide high side-load in verticle component mounting applications
  • SKS-R™ fasteners are available for various top sheet thicknesses and hole sizes




 Specifications   

Panel 1 (Bottom) Sheet Thickness Min.
.047 in

Panel 1 (Bottom) Mounting Hole B + .003 - .000
.277 in

Panel 2 (Top) Thickness Range
.040 to .047 in

Panel 2 (Top) Mounting Hole A1 Nom.
.073 in

Panel 2 (Top) Mounting Hole A2 ± .003
.146 in

Panel 2 (Top) Mounting Hole A3 ± .003
.236 in

Panel 2 (Top) Mounting Hole A4 Min.
.181 in

Panel 1 (Bottom) Sheet Hardness Max.1
HRB 88 / HB 183

Panel 2 (Top) Material
Any

A Max.

 View
.047 in

B ± .003
.217 in

C Max.
.315 in

D Anvil Hole + .003 - .000
.222 in

H Nom.
.315 in

M Max.
.198 in

N ± .003
.126 in

S ± .003
.155 in

Panel 1 (Bottom) Edge Distance C1 Min.
.295 in

Panel 1 (Bottom) Location Tolerance Max.
±.005 in

Panel 2 (Top) Edge Distance C2 Min.
.201 in

Standard Material
400 Series Stainless Stee

Standard Finish2
Passivated and/or tested per ASTM A380

CAD Supplier
PennEngineering® (PEM®)
1 HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.
2 See PEM Technical Support section of our web site for related plating standards and specifications.



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