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.

FHL (flush low-displacement head) Studs install closer to the edge of a sheet than PEM Types FH/FHS studs without causing that edge to bulge.
  • Installs closer to the edge of a sheet than PEM Type FH/FHS studs without causing that edge to bulge.
  • Flush-head for sheet thickness .040” and greater.
  • Type FHL is recommended for use in steel or aluminum sheets HRB (Rockwell “B” Scale) 80 or less and HB (Hardness Brinell) 150 or less.
  • Type FHLS is recommended for use in steel or aluminum sheets HRB (Rockwell “B” Scale) 70 or less and HB (Hardness Brinell) 125 or less.
Flush-head, low displacement studs - FHL, FHLS
Low-Displacement Head Studs - Types FHL, FHLS 2
Unit of Measure
1 2 3 4 

Item #

Thread Size

Hole Size in Sheet + .003 - .000

L - Length ± .015

H ± .015

S Max.

Fastener Material

Standard Finish

CAD

FHL-256-4ZI N/A .086-56 (#2-56) N/A .085 in N/A .250 in N/A .112 in N/A .080 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-440-4ZI N/A .112-40 (#4-40) N/A .111 in N/A .250 in N/A .138 in N/A .085 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-632-4ZI N/A .138-32 (#6-32) N/A .137 in N/A .250 in N/A .164 in N/A .090 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-832-4ZI N/A .164-32 (#8-32) N/A .163 in N/A .250 in N/A .190 in N/A .090 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-256-5ZI N/A .086-56 (#2-56) N/A .085 in N/A .312 in N/A .112 in N/A .080 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-440-5ZI N/A .112-40 (#4-40) N/A .111 in N/A .312 in N/A .138 in N/A .085 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-632-5ZI N/A .138-32 (#6-32) N/A .137 in N/A .312 in N/A .164 in N/A .090 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-832-5ZI N/A .164-32 (#8-32) N/A .163 in N/A .312 in N/A .190 in N/A .090 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-032-5ZI N/A .190-32 (#10-32) N/A .189 in N/A .312 in N/A .225 in N/A .100 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-256-6ZI N/A .086-56 (#2-56) N/A .085 in N/A .375 in N/A .112 in N/A .080 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-440-6ZI N/A .112-40 (#4-40) N/A .111 in N/A .375 in N/A .138 in N/A .085 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-632-6ZI N/A .138-32 (#6-32) N/A .137 in N/A .375 in N/A .164 in N/A .090 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-832-6ZI N/A .164-32 (#8-32) N/A .163 in N/A .375 in N/A .190 in N/A .090 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-032-6ZI N/A .190-32 (#10-32) N/A .189 in N/A .375 in N/A .225 in N/A .100 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-256-8ZI N/A .086-56 (#2-56) N/A .085 in N/A .500 in N/A .112 in N/A .080 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-440-8ZI N/A .112-40 (#4-40) N/A .111 in N/A .500 in N/A .138 in N/A .085 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-632-8ZI N/A .138-32 (#6-32) N/A .137 in N/A .500 in N/A .164 in N/A .090 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-832-8ZI N/A .164-32 (#8-32) N/A .163 in N/A .500 in N/A .190 in N/A .090 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-032-8ZI N/A .190-32 (#10-32) N/A .189 in N/A .500 in N/A .225 in N/A .100 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-256-10ZI N/A .086-56 (#2-56) N/A .085 in N/A .625 in N/A .112 in N/A .080 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-440-10ZI N/A .112-40 (#4-40) N/A .111 in N/A .625 in N/A .138 in N/A .085 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-632-10ZI N/A .138-32 (#6-32) N/A .137 in N/A .625 in N/A .164 in N/A .090 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-832-10ZI N/A .164-32 (#8-32) N/A .163 in N/A .625 in N/A .190 in N/A .090 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-032-10ZI N/A .190-32 (#10-32) N/A .189 in N/A .625 in N/A .225 in N/A .100 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
FHL-256-12ZI N/A .086-56 (#2-56) N/A .085 in N/A .750 in N/A .112 in N/A .080 in N/A Heat-Treated Carbon Steel N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless N/A CAD Icon (for items table)
Unit of Measure
1 2 3 4