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Counter Sunk Screw
Either of two screws (both right-handed and turning together in the same direction or one right-handed and the other left-handed and turning opposite ways) by which an object which they adjust or restrain may be moved in one direction or the other by the motion of one. A common use is to allow the head of a countersunk bolt, screw or rivet, when placed in the hole, to sit flush with or below the surface of the surrounding material (by comparison, a counter bore makes a flat-bottomed hole that might be used with a socket-head caps crew).
| ITEM NAME(METRIC SERIES) | SIZE | GRADE | DIMENSIONAL | CHEMICAL & MECHANICAL | FINISH |
|---|---|---|---|---|---|
| Counter Sunk Screw | METRIC: M6 , M8 M10 M12, M16, M20 | GR.,8.8, 10.9,12.9 | IS 6761 | IS 1367 PART 3 |
HOT DIP GALVANISED : IS 1367 PT 13 IS: 4759 BS EN: 1461, ASTM A153 ASTM A123 BLACK PHOSPHATE: IS 1367 PT 12 ELECTRO GALVANISED : IS: 1367 PT 11 , IS: 1573 PTFE COATING:ASTM D:3294 |
