HFH-M8-20ZI

High-Strength Studs – Type HFH/HFHS/HFHB

HFH-M8-20ZI

High-Strength Studs – Type HFH/HFHS/HFHB

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.

HFHB (heavy-duty BUSBAR®) Studs are ideal for applications which demand superior electrical/mechanical attachment points. Phosphor bronze studs offer twice the conductivity of carbon steel studs.- Types HFH and HFHS are for high-strength applications in sheets as thin as 1.30 mm.

  • Type HFHB is for superior electrical/mechanical attachment in copper.
  • Type HFH is recommended for use in steel or aluminum sheets HRB (Rockwell “B” Scale) 85 or less and HB (Hardness Brinell) 165 or less.
  • Type HFHS is recommended for use in steel or aluminum sheets HRB (Rockwell “B” Scale) 70 or less and HB (Hardness Brinell) 125 or less.
  • Type HFHB is recommended for use in copper sheets HRB (Rockwell “B” Scale) 55 or less and HB (Hardness Brinell) 83 or less.

Specifications

Thread Code
M8
Thread Size
M8 x 1.25
Thread Specification
6g, ASME B1.13M, External
Fastener Material
Carbon Steel
Standard Finish
Zinc plus Clear Chromate
For Use in Sheet Hardness
HRB 85 / HB 165 or Less
Length Code
20
Thread Strength_MPa
900
Product Category
High-Strength Studs – Type HFH/HFHS/HFHB
CAD Supplier
PennEngineering® (PEM®)
CADPartID
103715
Application Type
Aerospace, Automotive, Automotive Electronics, Commercial Vehicles, Datacom, Electric Vehicle Chargers, Electric Vehicles, Electronics, Industrial, Manufacturing & Sheet Metal Fabrication, Medical, Telecom
Base Panel Material
Aluminum, Steel
Brand
PEM
Fastener Characteristics
Threaded External
Industry
Automotive, Automotive Electronics, Datacom & Telecom, Defense, Electric Vehicles, Industrial & Commercial, Medical
Installation Equipment/Method
C-Frame Automatic Feed, C-Frame Manual Feed, In-Die
PEM Product Family
FH
Product Type
Studs
Technology Type
Self-Clinching
Unit (Metric/Unified)
Metric
H Plus Minus 025 Mm
12.5mm
Hole Size in Sheet + 0.13_mm
8mm
L Len Pm 015in Or 4mm
20mm
Max. Hole in Attached Parts_mm
9.5mm
Min. Dist. Hole C/L to Edge_mm
12.7mm
Min. Sheet Thickness_mm
2mm
S Max._mm
3.5mm
T Max._mm
1.78mm

Resources

Installation & Performance Data

fh-hfh-hfhs-hfhb-studs-metric
TYPE THREAD CODE REC. NUT TIGHTENING TORQUE (N•m) TEST SHEET THICKNESS & MATERIAL SHEET HARDNESS HRB INSTALLATION (kN) PUSHOUT (N) TORQUE-OUT (N•m) TENSILE STRENGTH (kN)
HFH M8 32 2.3 mm Aluminum 39 35.6 1700 30 32.9
HFH M8 32 2.3 mm Steel 58 44.5 2200 30 32.9

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