Laydown Threading Hardware Laydown Threading Toolholders In all cases, the proper shim selection is important. WIDIA™ toolholders are supplied with a shim for a 1,5° lead angle. Change the shim if your thread is more than 1° different. For more details on proper shim selections, see pages F100–F101. insert screw clamp assembly insert insert shim shim shim screw shim screw insert size and screw insert screw shim shim screw and washer clamp assembly 3ER S-SA3T SM-YIE3 S-SY3T CK-C3 3EL S-SA3T SM-YI3 S-SY3T CK-C3 4ER S-SA4T SM-YIE4 S-SY4T CK-C4 4EL S-SA4T SM-YI4 S-SY4T CK-C4 Laydown Threading boring bars 2IR S-SN2T — — — 2IL S-SN2T — — — 3IR S-SA3T SM-YI3 S-SY3T CK-C3 3IL S-SA3T SM-YIE3 S-SY3T CK-C3 4IR S-SA4T SM-YI4 S-SY4T CK-C4 4IL S-SA4T SM-YIE4 S-SY4T CK-C4 SM — Y E 3 — 2N Shim Y-shim for E — External iC — 16mm Shim Angle Laydown I — Internal standard inserts 2P 2º positive 1P 1º positive — 0º 1N 1º negative 2N 2º negative 3N 3º negative F78 widia.com