Dormer B100 B10030.0 HSS High Speed Steel Straight Shank Hand Reamer with H7 Accuracy, Diameter 30.0 mm, Single Pack

• High H7 accuracy - designed to finish holes within the limit of H7 hole tolerance (ISO limits and fits)
• Premium HSS material - can be used for reaming in many materials including steels, aluminium, stainless steel
• Tapered lead (Form B) - allows easy location and centring to improve accuracy and performance
• Precision ground geometry - left hand helix and right hand cutting provides smooth reaming and improves holes size and surface finish
• Straight shank with square drive - design primarily for hand held reaming with suitable wrench

Dormer b100 hss hand reamer spiral flute 30.00mm Hand reamers have a square on the end of the shank which allows placement into a wrench which the user rotates by hand. Used for opening out and finishing existing holes to H7 tolerance in most ferrous and non-ferrous metals. Flute Geometry - 7º Helix Left hand spiral. To obtain the best results when using reamers it is essential to make them 'work'. It is a common fault to prepare holes for reaming with too little stock left in. If insufficient stock is left in the hole before reaming then the reamer will rub quickly, show wear and will result in loss of diameter. It is equally important for performance not to leave too much stock in the hole.