A countersink (symbol: ) is a conical hole cut into a manufactured object, or the cutter used to cut such a hole. 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 counterbore makes a flat-bottomed hole that might be used with a socket-head capscrew).
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Countersunk Bolts are used when a flat surface is needed, usually in securing steel plates to a roadway or bridge deck during rehabilitation, railings, etc. Melted and manufactured in the U.S.A. with full mill cert traceability.Available with a Socket or Flat Head.. Finish: Plain, Hot Dip Galv or Mechanically Galvanized
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· Portland Bolt can manufacture the A449 countersunk bolts in other grades as well, starting at ½” through 1½” diameter. If the grade of a countersunk bolt is ever in question, it would always be best to contact Portland Bolt and discuss the grade options.
Countersunk bolts are bolts designed to fit inside a countersunk hole. A countersink is both the recessed hole and the tool to make the hole that allows compatible screws and bolts to screw in flush to a surface. Countersunk bolts are mostly hidden when screwed in, because their heads are shaped to fit within the special holes.
m6 dimensions The following table chart defines standard metric external thread size M1.6 to M18 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads.
Socket Cap Screws. UNC/UNF *Flat Head Countersunk. S325 – UNC/UNF Bare Steel
Metric Coarse Structural Slotted Countersunk Bolt with Nut grade-8.8 din7969 metric coarse Countersunk Short Square Neck Bolt Grade-4.6 DIN608 Metric Coarse Countersunk Square Neck Bolt with DIN 555 Nut Grade-4.6 DIN605
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NOTE Limited Use: flat head countersunk socket cap screws DIN 7991 are not intended for high strength application. The purpose of producing them with a strength of the property class 10.9 is to increase the wear resistance of the sockets.
Call 1 (253) 848-9349. A cpuntersunk screw is a conical hole cut into a manufactured object, or the cutter used to cut such a hole. A common use is to allow the head of a countersunk bolt or screw, when placed in the hole, to sit flush with or below the surface of the surrounding material.