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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.

TFH (non-flush) Studs are for sheets as thin as .020 inches. They may also be used in thicker sheets where flush head studs are not required. TFH studs are installed in the sheets in the same manner as flush-head studs; however, different punches and anvils are required. When installed, the TFH stud will be securely locked into the thin sheet with ample torque-out and pushout resistances. The stud head will not be flush but will project above the sheet surface approximately .025 in.
  • Non-flush for sheets as thin as .020”.
  • Type TFH is recommended for use in steel or aluminum sheets HRB (Rockwell “B” Scale) 80 or less and HB (Hardness Brinell) 150 or less.
  • Type TFHS is recommended for use in steel or aluminum sheets HRB (Rockwell “B” Scale) 70 or less and HB (Hardness Brinell) 125 or less.
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Unit of Measure
Items
Thin sheet studs, non flush - TFH, TFHS

Non-Flush Studs - Types TFH, TFHS - Unified
Thin sheet studs, non flush - TFH, TFHS

Non-Flush Studs - Types TFH, TFHS - Unified
Thin sheet studs, non flush - TFH, TFHS

Non-Flush Studs - Types TFH, TFHS - Unified
Thin sheet studs, non flush - TFH, TFHS

Non-Flush Studs - Types TFH, TFHS - Unified
Thin sheet studs, non flush - TFH, TFHS

Non-Flush Studs - Types TFH, TFHS - Unified
Thread Size N/A .086-56 (#2-56) N/A .112-40 (#4-40) N/A .138-32 (#6-32) N/A .164-32 (#8-32) N/A .086-56 (#2-56)
Thread Code N/A 256 N/A 440 N/A 632 N/A 832 N/A 256
Length Code N/A 4 N/A 4 N/A 4 N/A 4 N/A 5
Material Code N/A
Min. Sheet Thickness N/A .020 in
Hole Size in Sheet + .003 - .000 N/A .085 in N/A .111 in N/A .137 in N/A .163 in N/A .085 in
Max. Hole in Attached Parts N/A .105 in N/A .131 in N/A .157 in N/A .183 in N/A .105 in
L - Length ± .0151
N/A .250 in a1377_1.jpg N/A .250 in a1377_1.jpg N/A .250 in a1377_1.jpg N/A .250 in a1377_1.jpg N/A .312 in a1377_1.jpg
H ± .015 N/A .141 in N/A .176 in N/A .203 in N/A .234 in N/A .141 in
S Max.2 N/A .070 in
T Max. N/A .025 in
Min. Dist. Hole C/L to Edge3 N/A .187 in N/A .219 in N/A .250 in N/A .281 in N/A .187 in
For Use in Sheet Hardness N/A HRB 80 / HB 150 or less
Thread Specification N/A External, ANSI B1.1, 2A
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.