Drilling crowns and bits D=85- 250 MM

Drilling crowns and bits are intended for destruction of bottomhole during drilling by DTH hammers in medium and hard grounds, including abrasive, destroyed and crumbling grounds. Bayonet or slotted joint of a drilling crown or bit with a pneumatic impact tool differs in reliability and durability, provides fast change of the tool.
Edges of drilling crowns and bits are reinforced with hard alloy. The drilling crown has the rational form of the case, channels for supply of the returned air to a downhole, the x-shaped position of rock cutting edges. Drilling crowns are divided on pluggable (KNSh) and edge (K) according to the cutting structure type.

Name	Model of the downhole pneumatic machine	Type of connection with the pneumatic impact tool	Nominal diameter, mm	Manner of the hard alloy fastening	Shank diameter, mm
Pneumatic drilling bit, d= 96 mm	P-85R	bayonet	96	pressing	45
Pneumatic drilling bit, d= 113 mm	P-110	bayonet	113	pressing	52
Pneumatic drilling bit, d= 131 mm	P-130	bayonet	132	pressing	62
Pneumatic drilling bit, d= 151 mm	P-150	slotted	151	pressing	96*
Pneumatic drilling bit, d= 190 mm	P-150	slotted	190	pressing	96*
Pneumatic drilling bit, d= 232 mm	P-150	slotted	232	pressing	96*
Pneumatic drilling bit, d= 250 mm	P-150	slotted	250	pressing	96*
Drilling crown d=85 mm	P-85R	bayonet	85	soldering	45
Drilling crown d=105 mm	P-105	Ssots with joint-tongue	105	pressing	58
Drilling crown d=110 mm	P-110	bayonet	110	pressing	52

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Drilling crowns and bits D=85- 250 MM

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