DIN 82 Knurling, standard by Deutsches Institut Fur Normung E.V. (German National Standard), published on Jan. 01, 1973.

There are generally two different types of knurling process: cut knurling and form knurling. Each of these processes has its own particular areas of application with correlated properties:

RAA 0º	RBL 45º	RBL 30º	RBR 45º	RBR 30º
knurl with axially parallel grooves	left-hand knurl, spiral angle 30 degrees	left-hand knurl, spiral angle 45 degrees	right-hand knurl, spiral angle 30 degrees	right-hand knurl, spiral angle 45 degrees

RGE 30º	RGE 45º	RGV 30º	RGV 45º	RKE	RKV
left-right knurl, spiral angle 30 degrees, points raised	left-right-hand knurl, spiral angle 30 degrees, left-right-hand knurl, points raised	left-right-hand knurl, points indented	left-right-hand knurl, points indented, 45 degrees	cross-hatched knurl, points raised, 90 degrees	cross-hatched knurl, points indented, 90 degrees

Ref: How to control the tolerance after knurling?

• The external diameter of the workpiece will be increased.

• It will compress the surface of the workpiece.

• Not recommended for thin materials.

• Form knurling on workpieces with a small diameter is possible to result in slightly plastic deformation on its end, as mentioned previously in “Diamond Knurling Operation on CNC Lathe”.

• The CNC lathe is subjected to a greater load due to the higher pressure.

• Slower cutting speed and feed rate, compared to cutting knurling.

• Maximum precision and surface quality

• Can be used for knurling thin materials without deformation

• Saves time on account of higher cutting speed and feed rate

• Compatible with virtually any material, including cast iron and plastic

• Cutting process with less loading protects the top end CNC lathe.

• No or minimal changes to the external workpiece diameter.