20mm Metric Hand Reamer - Alloy Tool Steel 9CrSi H8 with 6 Straight Flutes | Precision Hand Milling Cutter for Metalworking, DIY Projects & Industrial Applications

Notes on Use Appropriately reducing the cutting speed and feed speed can prolong the service life of the reamer; When working, it is necessary to add cutting fluid to protect the cutting edge to make the cutting smoother;When the oxide film or other hardened layer remains on the surface of the workpiece, it can be removed by reverse milling. Feature It adopts a suitable negative rake angle design, which is effective in anti-vibration and has good guiding performance.The use of large core diameter enhances the rigidity of the tool to make cutting and chip removal stable. Feature The shank is finely ground and chamfered, with a high horizontal reference.Efficient clamping and high concentricity provide high accuracy for product processing. Feature Wide chip flute, H7 high precision Smooth inner surface, Smooth chip removal without residue Explanation of Reaming Allowance In order to improve its dimensional accuracy and hole surface quality, reasonable reaming can effectively improve the hole accuracy and surface quality.Generally, the reaming allowance is 0.1-0.25mm (one side). For larger diameter holes, the reaming allowance should be increased appropriately, but the allowance should not be greater than 0.3mm.There is an experience that suggests to reserve a thickness of 1-3% of the reamer diameter as the reaming allowance (diameter value). For example, it is more appropriate to add a Φ20 reamer with a hole diameter of about Φ19.6: 20－(20×2/ 100)=19.6Reaming allowances are usually made smaller for hard materials and some aerospace materials. 5.5mm 5/8 inch 3/4 inch 10mm 7mm Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Customer Reviews 4.0 out of 5 stars 21 4.3 out of 5 stars 16 3.9 out of 5 stars 7 4.6 out of 5 stars 36 4.2 out of 5 stars 4 Price $7.49$7.49 $9.19$9.19 $9.99$9.99 $8.19$8.19 $6.99$6.99 PIECE 1 1 1 1 2

【SIZE】Cutting Dia. 20mm, Square shank side15mm/0.59"; Tool flute length 105mm/4.13"; Overall length 200mm/7.87".Package include 1 piece.

【MATERIAL】Made by 9Crsi alloy tool steel, Hard and durable，reaches H8 level of drilling accuracy, reduces surface roughness of workpieces.

【CHAMFERED ANGLE DESIGN】Chamfered Angle in the bottem provide orienting effects, ensure axis position and roundness.

【FEATURE】 Reamer can be hand operated by use of wrenches and used for light cut, repair work, removing stock or simply for enlarging holes.

【APPLICATION】Designed for accurate reaming in aluminum, cast iron, copper, magnesium alloy, plastic etc.