Carbon Cold Finish Hexagon Steel Bar – ASTM A108

Cold finished steel bars are widely used in automatic screw machines as well as in other methods of machining. This demand is due to size accuracy, finish, straightness, roundness, and the energy saving characteristics of cold drawn bars.

Below you will find a comprehensive chart detailing each grade, their applications and size range stocked for HEXAGON shaped bars.

tolerances chemistry-and-mechanical

GradeSize RangeLength
10181/4" to 3" Hexagon10'/12' RL
Description: This low carbon steel has good case hardening properties. Although not classed as screw machine steel, at times it may be specified. This is an excellent steel for bending and cold forming, with good brazing and welding properties.
Application: Case hardened parts where core strength is not critical. Widely used in shafting applications.
10451/2" to 2-1/2" Hexagon10'/12' RL
Description: This medium carbon steel is used for heat treating (quenching and tempering). Although it has only a fair response to conventional quenching, it is widely used where requirements are not too stringent. It is also used extensively in induction hardening applications. This is not normally considered a screw machine steel and is only fair for brazing and welding. However, it can be forged satisfactorily and is the most common shafting steel in the medium carbon range.
Application: Medium strength parts, particularly where hardenability for wear or higher strength is needed. Shafts for hydraulic and pneumatic cylinders.
11173/8" to 2-1/2" Hexagon10'/12' RL
Description: This is a resulphurized steel with good machinability and surface finish, but not as good as the standard screw stocks. Its case hardening characteristics are superior and it develops an excellent core. It brazes satisfactorily but has no more than fair welding properties. This is a more ductile steel than others of lower manganese content and it cold forms well. Its machinability is rated at 89% of 1212.
Application: More important parts where the combined properties of good machining and superior case hardening are required, but where some machinability and finish (compared with standard screw stocks) can be sacrificed.
12L143/16" to 4" Hexagon10'/12' RL
Description: A standard resulfurized and rephosphorized grade carbon steel and a free machining steel. The added lead to the chemical composition provides improved machinability. Although the machinability is very good, the added lead content reduces the overall strength of this alloy.
Application: Typical applications include high-speed screw machine products, spindles, bushings, hose fittings and many other items where excellent machining characteristics can be fully utilized.
12153/16" to 3" Hexagon10'/12' RL
Description: The A.I.S.I. grade 1215 has essentially eliminated a number of similar free machining grades, such as 1212. Both 1215 and 1213 machine considerably faster than 1212 and provide good surface finish and brazing properties. These steels are difficult to weld and are not recommended for case hardening. They are generally used where mechanical properties can be sacrificed for machinability.
Application: Screw machine parts that are not subject to severe stresses.
1144 A311/Stressproof ®, ASTM A108, ASTM A311 CL B1/4" to 2" Hexagon10'/12' RL
Description: Made by a patented process which consists of drawing the bar through a special die under heavy draft, then stress relieving it in a precisely controlled furnace. It offers wearability without case hardening, strength without heat treating, and excellent machinability and tool life. It resists fatigue and stress, and offers minimum warpage distortion.
Application: Parts you are now heat treating from Rc 23 to Rc 30. A uniform material which provides exceptional quality for production, maintenance or special machine parts.
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