Zygology - Heavy Duty Studs for Thin Sheets - Type THFE - Unified - Compare Items

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Enlarged head diameter reduces stress on panel.
Thicker head allows for larger hole in attached panels.
Clinch design provides high-strength in sheets as thin as .031”.
Recommended for use in steel or aluminum sheets HRB (Rockwell “B” Scale) 85 or less and HB (Hardness Brinell) 165 or less.

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Items	THFE-0420-8ZI Heavy Duty Studs for Thin Sheets - Type THFE - Unified	THFE-0518-8ZI Heavy Duty Studs for Thin Sheets - Type THFE - Unified	THFE-0420-12ZI Heavy Duty Studs for Thin Sheets - Type THFE - Unified	THFE-0518-12ZI Heavy Duty Studs for Thin Sheets - Type THFE - Unified	THFE-0420-16ZI Heavy Duty Studs for Thin Sheets - Type THFE - Unified
Thread Size	N/A .250-20 (1/4-20)	N/A .313-18 (5/16-18)	N/A .250-20 (1/4-20)	N/A .313-18 (5/16-18)	N/A .250-20 (1/4-20)
Thread Code	N/A 0420	N/A 0518	N/A 0420	N/A 0518	N/A 0420
Length Code	N/A 8	N/A 8	N/A 12	N/A 12	N/A 16
Min. Sheet Thickness¹	N/A .031 in
Hole Size in Sheet + .005 - .000	N/A .250 in	N/A .312 in	N/A .250 in	N/A .312 in	N/A .250 in
L - Length ± .015	N/A .500 in	N/A .500 in	N/A .750 in	N/A .750 in	N/A 1.00 in
H ± .01	N/A .462 in	N/A .586 in	N/A .462 in	N/A .586 in	N/A .462 in
S Max.²	N/A .109 in	N/A .117 in	N/A .109 in	N/A .117 in	N/A .109 in
T Max.	N/A .069 in	N/A .099 in	N/A .069 in	N/A .099 in	N/A .069 in
Max. Hole in Attached Parts	N/A .340 in	N/A .402 in	N/A .340 in	N/A .402 in	N/A .340 in
Min. Dist. Hole C/L to Edge	N/A .446 in	N/A .596 in	N/A .446 in	N/A .596 in	N/A .446 in
Thread Strength	N/A 120 ksi
For Use in Sheet Hardness	N/A HRB 85 / HB 165 or Less
Thread Specification	N/A External, ASME B1.1, 2A
Fastener Material	N/A Hardened Carbon Steel
Standard Finish	N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless
CAD Supplier	N/A PennEngineering® (PEM®)
¹ For maximum performance, we recommend that you use the maximum shank length for your sheet thickness. 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.