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  • Installs into thinner, harder, high strength steel materials (high strength steel sheets up to 700 MPa maximum ultimate tensile)
  • Allows overall weight reduction for all vehicles
  • Provides lower installed cost
Compare to other thin sheet fastening devices:
  • Addresses environmental concerns
  • Lighter weight
  • Close to edge of panel mounting
  • No embossing required
  • Hardened stud material provides stronger thread strength
  • Can be installed automatically using press or in-die technology
Type HFLH™ Hard Panel Studs
Type HFLH™ Hard Panel Studs_2
Unit of Measure
Items Type HFLH™ Hard Panel Studs
HFLH-M5-15ZI
Type HFLH™ Hard Panel Studs - Metric
Type HFLH™ Hard Panel Studs
HFLH-M5-20ZI
Type HFLH™ Hard Panel Studs - Metric
Type HFLH™ Hard Panel Studs
HFLH-M5-25ZI
Type HFLH™ Hard Panel Studs - Metric
Type HFLH™ Hard Panel Studs
HFLH-M5-30ZI
Type HFLH™ Hard Panel Studs - Metric
Type HFLH™ Hard Panel Studs
HFLH-M5-35ZI
Type HFLH™ Hard Panel Studs - Metric
Thread Size x Pitch N/A M5 x 0.8
Thread Code N/A M5
Length Code N/A 15 N/A 20 N/A 25 N/A 30 N/A 35
Min. Sheet Thickness N/A 1.0 mm
Hole Size in Sheet + 0.13 N/A 5 mm
L - Length ± 0.4 N/A 15 mm Type-HFL-Hard-Panel-Studs_2.jpg N/A 20 mm Type-HFL-Hard-Panel-Studs_2.jpg N/A 25 mm Type-HFL-Hard-Panel-Studs_2.jpg N/A 30 mm Type-HFL-Hard-Panel-Studs_2.jpg N/A 35 mm Type-HFL-Hard-Panel-Studs_2.jpg
H ± 0.25 N/A 9.6 mm
S Max.1 N/A 2.6 mm
T Max. N/A 1.35 mm
Max. Hole in Attached Parts N/A 7.3 mm
Min. Dist. Hole C/L to Edge N/A 10 mm
Tensile strength N/A 900 MPa
For Use in Sheet Hardness2 N/A HRB 96 / HB 216 or Less
Thread Specification N/A External, ASME B1.1, 2A / ASME B1.13M, 6g
Fastener Material N/A Heat-Treated Alloy Steel
Standard Finish N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless
Optional Finish3 N/A
CAD Supplier N/A PennEngineering® (PEM®)
  • 1 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.
  • 2 HRB - Hardness Rockwell "B" Scale. HB - Hardness Brinell
  • 3 “X” suffix studs may have pitch diameters and major diameters below 2A “Basic”, per ANSI B1.1, Section 7, and B1.13M, Section 8 to allow for minimum of 0.0002” / 0.0051 mm of plating.