Hi-Tech Fasteners Inc.
Hi-Tech Fasteners, Inc.
4940 Winchester Boulevard
Frederick, Maryland 21703-7400

Toll Free: 800.466.1940
Tel: 301.831.1277
Fax: 301.831.8296
Email: sales@hitechfasteners.com
Website: www.hitechfasteners.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
Items Flush-head studs - FH, FH4, FHA, FHP, FHS
FH-M2.5-6ZI
Self-Clinching Threaded Studs - Type FH/FHS/FHA - Metric 		Flush-head studs - FH, FH4, FHA, FHP, FHS
FH-M3-6ZI
Self-Clinching Threaded Studs - Type FH/FHS/FHA - Metric 		Flush-head studs - FH, FH4, FHA, FHP, FHS
FH-M3.5-6ZI
Self-Clinching Threaded Studs - Type FH/FHS/FHA - Metric 		Flush-head studs - FH, FH4, FHA, FHP, FHS
FH-M4-6ZI
Self-Clinching Threaded Studs - Type FH/FHS/FHA - Metric 		Flush-head studs - FH, FH4, FHA, FHP, FHS
FH-M2.5-8ZI
Self-Clinching Threaded Studs - Type FH/FHS/FHA - Metric
Thread Size x Pitch N/A M2.5 x 0.45 N/A M3 x 0.5 N/A M3.5 x 0.6 N/A M4 x 0.7 N/A M2.5 x 0.45
Thread Code N/A M2.5 N/A M3 N/A M3.5 N/A M4 N/A M2.5
Length Code N/A 6 N/A 6 N/A 6 N/A 6 N/A 8
Material Code N/A
Min. Sheet Thickness N/A 1 mm
Hole Size in Sheet + 0.08 N/A 2.50 mm N/A 3 mm N/A 3.5 mm N/A 4 mm N/A 2.50 mm
Max. Hole in Attached Parts N/A 3.10 mm N/A 3.60 mm N/A 4.10 mm N/A 4.60 mm N/A 3.10 mm
L - Length ± 0.41 N/A 6 mm a1374_1.jpg N/A 6 mm a1374_1.jpg N/A 6 mm a1374_1.jpg N/A 6 mm a1374_1.jpg N/A 8 mm a1374_1.jpg
H ± 0.4 N/A 4.10 mm N/A 4.60 mm N/A 5.30 mm N/A 5.90 mm N/A 4.10 mm
S Max.2 N/A 1.95 mm N/A 2.10 mm N/A 2.25 mm N/A 2.4 mm N/A 1.95 mm
Min. Dist. Hole C/L to Edge3 N/A 5.40 mm N/A 5.6 mm N/A 6.40 mm N/A 7.2 mm N/A 5.40 mm
For Use in Sheet Hardness N/A HRB 80 / HB 150 or less
Thread Specification N/A External, ASME B1.13M, 6g
Fastener Material N/A Heat-Treated Carbon Steel
Standard Finish N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless
Optional Finish4 N/A
CAD Supplier N/A PennEngineering® (PEM®)
Inventory N/A {0} N/A {0} N/A {0} N/A {0} N/A {0}
  • 1 The “L” dimension is the height of the installed stud at max grip. The height of the stud will increase if it is installed into thinner material. To calculate “actual L” use this formula: max grip - actual grip + L = “actual L”
  • 2 Threads are gageable to within 2 pitches of the “S” Max. dimension. A class 3B/5H maximum material commercial nut shall pass up to the “S” Max. dimension.
  • 3 To minimize sheet distortion and maximize product performance, use a centerline-to-edge value greater or equal to the value specified.
  • 4 “BL” suffix will be added to part number to designate DuraBlack™ finish.