supply of slotted pan head tapping screwslotted pan head tapping screw,slotted pan head tapping screw to specn: is:71731/89-iso 1481/83 st4.2 x 38c [ war ranty period: 30 months after the date of delivery ] ] , tapping screw is: 7173-iso-1481 st 4.2x13c to specn no; is-7173/89. [ warranty period : 30 months after the date of delivery ] ] , tapping screw to is:7173/2018 (reviewed in 2023), iso 1481-2011 st 4.8 x 20c. [ warran ty period: 30 months after the date of delivery ] ] , tapping screw zinc plated iso 1481-st 4.8x38 c specn: bis specification no: is: 7173 / [reaffirmed 2004]1989 or latset. [ warranty period: 30 months after the date of delivery ] ] , tapping screw size st 4.2 x 19 c to specn is.7173 iso-1481.. [ warranty period: 30 m onths after the date of delivery ] ]