Countersunk Bolts are bolts designed to fit inside a countersunk hole. Countersunk bolts are mostly hidden when screwed in, because their heads are shaped to fit within the special holes. When these holes are empty, they look like a normal screw hole with a conical opening at the top; when they are full, the only visible part should be the very top of the screw or bolt. This conical opening allows countersunk bolts to screw into the hole and down into the opening, so the bolt head is flush with the surface of the object.

Specification :

Standards : ASTM / ASME / BS / DIN / BS EN ISO

Size : 1/2″ diameter through 1-1/2″ diameter

Length : Length Upto 5 Meters

Threads : UNC, 8UN, UNF, Metric Coarse & Fine Series.

 

Material & Grades

 

Stainless Steel Countersunk Bolts :
304/304L, ASTM A182 F316L, 304L, DIN 1.4301, DIN1.4306, DIN 1.4401, DIN 1.4404

Duplex & Super Duplex Steel Countersunk Bolts :
UNS NO S31803, S32205. UNS S32750, S32950. Werkstoff No. 1.4462

Nickel Alloy Countersunk Bolts :
UNS 2200 ( NICKEL 200 ), UNS 2201 (NICKEL 201 ), UNS 4400 (MONEL 400 ), UNS 8020 ( ALLOY 20 / 20 CB 3, UNS 8825 INCONEL (825), UNS 6600 (INCONEL 600 ), UNS 6601 ( INCONEL 601 ), UNS 6625 (INCONEL 625), UNS 10276 ( HASTELLOY C 276 )