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Diamond Drill Bits

NF Diamond Drill Bits

NF Diamond bits and reaming shells are used for mineral exploration, core sampling, large scale engineering, etc. Our products include surface-set and impregnated core bits, casing and rod shoes, reaming shells and PDC or polycrystalline bits.

Contact us for our competitive prices.

NF Diamond Impregnated Bits are the most commonly used in the mineral exploration industry as they have the widest range of application. The carefully selected grades of high quality synthetic diamonds are distributed in the depths of the impregnated bit's matrix series. The matrix layer of the crown contains a uniform distribution of these crystals that are embedded in a powdered metal bond.

NF Surface-set Diamond Bits are set with a singular layer of natural diamond utilizing a hard matrix compound on the face of the bit. The diamond set design ensures sufficient overlap to prevent premature wear of the matrix. Surface set bits achieve maximum results when used for drilling in soft and medium hard formations. It is a recognized practice to use larger set diamonds in the softer formations.

Synthetic Diamond Gear Type Impregnated Core Bits are specially designed for drilling in very hard and slipped formation rock. If used in the correct rock type then the drilling speed is faster than with other bits designs. These bits can't be used in soft and high abrasive formation rocks. The matrix of these bits are marked A, B, C, D, E (from harder to softer).

The NF Reaming Shell is set with natural diamonds or polystallines and is used to couple the drill bit with the core barrel. Its main function is to ream the hole to the correct constant specific diameter which ensures adequate clearance for the core barrel and sufficient clearance for the new bit which replaces an old one. It also acts as a stabilizer for the drill bit.

Diamond Drill Bit Selection Guide

Semi-round	Drilling ediumm-hard and hard rocks, or a little broken and loose formations
Flat	For impregnated bit only, for drilling hard abrasive rocks
Bottom discharge design	Drilling sedimentary or metamorphic formations containing more powder mineral with high core recovery percentage, and no excessive core washout.
Stepped	Drilling medium-hard, broken or interbedded formations, preventing hole deviation
Serrate / V-ring	Drilling hard dense formations with high penetration rate

Diamond Concentration and Size
Rock Formation	Medium-hard	Medium-hard and hard	Very hard
Diamond Concentration	High	Medium	Low
Impregnated synthetic diamond size	>40mesh	46-60mesh	60-80mesh	80-100mesh
Surface set natural diamond size	15-25 SPC	25-40 SPC	40-60 SPC	60-100 SPC

Rock hardness (mohs)	Rock type	Formation characteristics	Matrix type	Bit Selection
Rock hardness (mohs)	Rock type	Formation characteristics	Matrix type	Black	Red	Blue	Green	Silver
4	Calcite, limestone, sandstone, shale, siltstone	Soft , Very abrasive , Highly fractured	NF1
4	Calcite, limestone, sandstone, shale, siltstone	Soft , Very abrasive , Highly fractured	NF2
5	Dolomitic limestone, norite granite, schist, serpentine	Medium soft, Abrasive , Medium to coarse grain	NF3
			NF3*
			NF4
6	Andesite, dacite, diabase, diorite, dolomite, hematite, mica schist, peridotite, silicified schist, syenite	Medium hard, Moderately abrasive, Medium to fine grain	NF5*
			NF5
			NF6
7	Basalt, diorite, gabbro, garnet skarns, gneiss, granite, pegmatite, porphyry, quartzite, rhyolite, trachyte, silicified volcanics	Hard , Moderately abrasive, Fine grain	NF7*
			NF7
			NF8
8	Chert, jasperlite, quartzite, rhyolite, taconite	Hard, Non-abrasive, Fine grain	NF9*
			NF9
			NF10
9	Chert, ironstone, glassy quartzite, rhyolite, taconite	Very hard, Non-abrasive, Very fine grain	NF11*
			NF11
			NF12

* Very abrasive

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