Xiamen Bestlink Factory Co., Ltd.  

Product Name: Quarry 7 Degree Taper Steel Tubes for Rock Drilling Model NO.: 7 degree Application: Quarry, Mining and Civil Construction Usage: Small Hole Drilling Condition: New Loading Port: Xiamen MOQ: 50 PCS Degree Type: 4.46, 6, 7, 11 Trademark: BESTlink Transport Package: Nude Packing Specification: ISO Origin: Xiamen, China HS Code: 72288000 Product Description Quarry 7 Degree Taper Steel Tubes for Rock DrillingAplication: The tapered steel rod is used for rock drilling, blasting holes and other drilling works in the quarries, coal mines, traffic and other constructions.How to choice the taper degree?Different rock formations and rock drills require different taper angles. When drilling with high impact hydraulic rock drills in medium-hard to hard and abrasive rock formations, a wide taper angle is normally used. Taper angles of 11 and 12-degrees are normally used on modern drill rigs.For low impact rock drills and softer rock formations, a narrow taper angle of 7 degrees is used. A 7-degree angle can also be used if bit spinning is a problem when using 11 and 12-degree equipment.In addition, a 4,46 degree angle is ideal for soft rock when you're using pneumatic or hydraulic drill rigs - to prevent bits from spinning or becoming detached.Generally, the light-duty rock drill uses 7 taper or smaller taper angle, the heavy-duty rock drill mainly uses 12 taper angle.Products technical data:Shank Hex:19mm*83/108mm; 22m*83/108mm; 25mm*108/159mm;Taper degree: 4.46 6 7 11 12Drilling rod length:0.4m-6mWeight: from 1.7 kgs to 18.4kgsModelTaper DegreeDrilling Rod LengthShank SizeHex.19mm4.46 6 7 11 120.4m-4.0m83mm,108mmHex.22mm4.46 6 7 11 120.8m-6.0m83mm,108mmHex.25mm4.46 6 7 11 120.8m-6.0m108mm,159mmProducts advantages:1.The tapered steel rod can be matched with multiple drill bits to drill blast holes with different diameters.2. The tapered steel rod also has the advantages of no need of scrapping after abrasion of drill bits, simple maintenance, low price, low cost of drilling each meter, etc.3.We have a lot of stock, if you need, the delivery for the tapered steel rod can be expedited.