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All Categories > PEM® Brand Fasteners for Metal Sheets and Panels > Studs and Pins for Sheet Metal > High Tensile Strength Studs, Non Flush – Types HF109, HFG8 > High-Tensile Strength Studs - Types HFG8™, HF109™ - Metric > Part # HF109-M8-25ZI  

Part # HF109-M8-25ZI, High-Tensile Strength Studs - Types HFG8™, HF109™ - Metric

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PEM® self-clinching studs are installed by placing them in properly sized holes in the sheets and squeezing into place with any standard press. The squeezing action embeds the head of the stud into the sheet. The metal displaced by the head flows smoothly and evenly around the ribs and into the annular groove - creating a flushhead assembly and securely locking the stud into the sheet with high torque-out and pushout resistances.

HFH (heavy-duty) Studs replace weld studs with easier installation at lower costs. The large stud head which projects above the sheet material distributes the axial tightening force over a large area thereby improving pull through resistance.

HFG8 and HF109 (heavy-duty high tensile strength) Studs are manufactured for the most demanding applications from medium carbon alloy steel, then heat-treated to high strength and hardness qualities.
  • Types HFG8 and HF109 are for heavy-duty applications in sheets as thin as 1.000 mm.
  • Grade 8 and property class 10.9 studs meeting 150 ksi/1040 MPa minimum.
  • Recommended for use in steel or HSLA steel sheets HRB (Rockwell “B” Scale) 89 or less and HB (Hardness Brinell) 180 or less.
  • Large head diameter spreads compressive stress on panel.
To be sure that you are getting genuine PEM products, look for the PEM stamp. Studs within the size range of the SAE and ISO specs are also identified with the Grade 8 and 10.9 head markings respectively.




 Specifications   

Thread Size x Pitch
M8 x 1.25

Thread Code
M8

Length Code
25

Min. Sheet Thickness
1.5 mm

Hole Size in Sheet + 0.13
8 mm

Max. Hole in Attached Parts
10.3 mm

L - Length ± 0.41

 View
25 mm

H ± 0.25
16.60 mm

S Max.
3.40 mm

T Max.
3.25 mm

Min. Dist. Hole C/L to Edge
21.00 mm

For Use in Sheet Hardness
HRB 89 / HB 180 or Less

Thread Specification
External, ASME B1.13M, 6g

Fastener Material
Heat-Treated Medium Carbon Alloy Steel

Standard Finish
Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless

CAD Supplier
PennEngineering® (PEM®)
1 Other lengths available up to a maximum of 40mm (metric) on special order.


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·  HFG8_Installed



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