Plunger, Spring, Steel, Black Oxide Body, Case Hardened Steel, Black Oxide Plunger, Ball Material N/A, 302/304 Stainless, Body Width 5/16 In, Body Length 1 In, Plunger Dia (In) 0.135, Plunger Travel 0.187 In, 5/16-18, 3.00 Initial, 15.00 Final, Function Used In Applications When Higher End Forces Are Needed, Often Used To Raise Or Eject Parts, Package Quantity 5 Spring PlungersApply controlled tension to workpieces. Can be used for positioning in fixtures or to eject parts from a punch press or forging die. Provide accurate spring end force with excellent wear resistance.Thread sizes up to 5/8-11 sold in pkg. of 5 Thread sizes 3/4-10 and up sold in pkg. of 2 Choose plungers either: with locking element or without locking element