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Ejecting fasteners are designed for use on curved or contoured surfaces where ejection of the fastener is essential to remove the top panel. The ejecting mechanism also gives an instant signal that the fastener is unlocked. EHF are available with flush head only. EHF5 ejecting fasteners use S5 springs, and EHF6 use S6 springs. All EHF fasteners are zinc plated mild steel.
EHF5 series fasteners are 1.47" long and 7/8" wide.
EHF6 series fasteners are 1.725" long and 1 3/32" wide.
To calculate the correct pairing of fastener and spring us the following formula: Add together the thicknesses of both panels to be fastened and the spring clearance. Subtract spring deflection (0.047" for EHF5 and 0.062" for EHF6). Then select the fastener with the nearest shaft length.