Zygology
Zygology Ltd
Unit 7, Thame 40 Jane Morbey Road
Thame Oxon OX9 3RR
Phone: 0808 123 1221
Fax: +44 1844 266021
Email: sales@zygology.com
Web Address: www.zygology.com
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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.

FH (flush-head) studs are available in aluminum, steel, or stainless steel. They are also available unthreaded on special order.
  • Flush-head in designated minimum sheet thickness or greater.
  • Type FH is recommended for use in steel or aluminum sheets HRB (Rockwell “B” scale) 80 or less and HB (Hardness Brinell) 150 or less.
  • Type FHS is recommended for use in steel or aluminum sheets HRB (Rockwell “B” scale) 70 or less and HB (Hardness Brinell) 125 or less.
  • Type FHA is recommended for use in aluminum sheets HRB (Rockwell “B” scale) 50 or less and HB (Hardness Brinell) 82 or less.
Flush-head studs - FH, FH4, FHA, FHP, FHS
Self-Clinching Threaded Studs - Type FH/FHS/FHA 2
Unit of Measure
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Item #

Thread Size x Pitch

Hole Size in Sheet + 0.08

L - Length ± 0.4

H ± 0.4

Fastener Material

Standard Finish

Optional Finish

CAD

FHS-M3-20 N/A M3 x 0.5 N/A 3 mm N/A 20 mm N/A 4.6 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M3.5-20 N/A M3.5 x 0.6 N/A 3.50 mm N/A 20 mm N/A 5.30 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M4-20 N/A M4 x 0.7 N/A 4 mm N/A 20 mm N/A 5.9 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M5-20 N/A M5 x 0.8 N/A 5 mm N/A 20 mm N/A 6.5 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M6-20 N/A M6 x 1 N/A 6 mm N/A 20 mm N/A 8.2 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M8-20 N/A M8 x 1.25 N/A 8 mm N/A 20 mm N/A 9.6 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M3-25 N/A M3 x 0.5 N/A 3 mm N/A 25.00 mm N/A 4.6 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M3.5-25 N/A M3.5 x 0.6 N/A 3.50 mm N/A 25.00 mm N/A 5.30 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M4-25 N/A M4 x 0.7 N/A 4 mm N/A 25.00 mm N/A 5.9 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M5-25 N/A M5 x 0.8 N/A 5 mm N/A 25.00 mm N/A 6.5 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M6-25 N/A M6 x 1 N/A 6 mm N/A 25.00 mm N/A 8.2 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M8-25 N/A M8 x 1.25 N/A 8 mm N/A 25.00 mm N/A 9.6 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M3.5-30 N/A M3.5 x 0.6 N/A 3.50 mm N/A 30 mm N/A 5.30 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M4-30 N/A M4 x 0.7 N/A 4 mm N/A 30 mm N/A 5.9 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M5-30 N/A M5 x 0.8 N/A 5 mm N/A 30 mm N/A 6.5 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M6-30 N/A M6 x 1 N/A 6 mm N/A 30 mm N/A 8.2 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M8-30 N/A M8 x 1.25 N/A 8 mm N/A 30 mm N/A 9.6 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M4-35 N/A M4 x 0.7 N/A 4 mm N/A 35 mm N/A 5.9 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M5-35 N/A M5 x 0.8 N/A 5 mm N/A 35 mm N/A 6.5 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M6-35 N/A M6 x 1 N/A 6 mm N/A 35 mm N/A 8.2 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHS-M8-35 N/A M8 x 1.25 N/A 8 mm N/A 35 mm N/A 9.6 mm N/A 300 Series Stainless Steel N/A Passivated and/or Tested Per ASTM A380 N/A N/A CAD Icon (for items table)
FHA-M2.5-6 N/A M2.5 x 0.45 N/A 2.5 mm N/A 6 mm N/A 4.1 mm N/A Aluminum (Plain Finish) N/A No Finish N/A N/A CAD Icon (for items table)
FHA-M3-6 N/A M3 x 0.5 N/A 3 mm N/A 6 mm N/A 4.6 mm N/A Aluminum (Plain Finish) N/A No Finish N/A N/A CAD Icon (for items table)
FHA-M3.5-6 N/A M3.5 x 0.6 N/A 3.50 mm N/A 6 mm N/A 5.30 mm N/A Aluminum (Plain Finish) N/A No Finish N/A N/A CAD Icon (for items table)
FHA-M4-6 N/A M4 x 0.7 N/A 4 mm N/A 6 mm N/A 5.9 mm N/A Aluminum (Plain Finish) N/A No Finish N/A N/A CAD Icon (for items table)
Unit of Measure
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