This website uses cookies primarily for visitor analytics. Certain pages will ask you to fill in contact details to receive additional information. On these pages you have the option of having the site log your details for future visits. Indicating you want the site to remember your details will place a cookie on your device. To view our full cookie policy, please click here. You can also view it at any time by going to our Contact Us page.

Self-clinching threaded standoff fasteners

01 June 2018

PEM TSO4self-clinching threaded standoffs from PennEngineering offer reliable fastener solutions to securely stack or space components in ultra-thin stainless steel assemblies.

These hardened stainless steel fasteners clinch into stainless sheets as thin as .025”/0.63mm and become permanent parts of an assembly. The standoffs ultimately will reduce the amount of required hardware in an assembly, promote thinner and lighter designs, and minimise typical handling issues associated with loose hardware.

Among unique design features, the fastener’s thread design at the barrel end minimises the length for a mating screw. Shorter standoffs are typically thru-threaded and longer standoffs are blind. Thread-type variations with a thicker wall can further be specified to provide increased bearing surface for the mating component or panel. For applications in potentially corrosive environments, an optional nickel plating can be added for excellent corrosion resistance.

PEM TSO4 standoffs are available in thru-threaded or blind threaded versions and in a variety of lengths and several standard thread sizes (#2-56, #4-40, and #6-32/M2.5, M3, and M3.5). They are manufactured from hardened 400 Series stainless steel for use in stainless sheets with maximum hardness up to HRB 88 on the Rockwell “B” scale or HB 183 on the Brinell scale.

The standoffs mount simply and quickly by pressing the fastener into a round hole in the host sheet and applying sufficient squeezing force using a standard press to embed the standoff’s head flush in the sheet and complete the process. A single mating screw completes the attachment process. 

Detailed specifications, fastener drawings and 3D models, and performance data (Bulletin SO) for these RoHS-compliant fasteners can be viewed and downloaded for free at

Contact Details and Archive...

Print this page | E-mail this page