Free-cutting steel

Free-cutting steels for CNC machines and automatic lathes. The Sandvik program of free-machining steels includes carbon steel in size range 0.49-12 mm (0.0192-0.472 in.) and stainless steel in size range 0.50-80 mm (0.0196-3.15 in.).

Sandvik free-cutting steels are characterized by excellent machinability and surface finish and have tight and consistent tolerances. This contributes to increased cutting speeds, reduced tool wear and shorter set-up times.

New lead-free free-cutting steel

Sandvik Finemac, our latest development within free-cutting steel, is an environmentally friendly, lead-free material offering a wider hardening window than other free-cutting steel grades.
Read more about Sandvik Finemac free-cutting steel

Material

Free-cutting steel grades

The Sandvik program of free-cutting steels includes both carbon steel and stainless steel. Technical data, such as nominal chemical composition and mechanical properties, is found in the datasheet for the respective grade.

Other grades can be offered on request.

Carbon steel
Sandvik grade Description Typical applications
Sandvik Finemac A lead-free, hardenable, free-cutting carbon steel characterized by excellent machinability, high hardness, high wear resistance and exceptional dimensional stability after hardening. Watch parts, ABS brake components, shafts, test probes, automotive dashboard components
Sandvik 20AP A hardenable, free-cutting carbon steel characterized by excellent machinability, high hardness, high wear resistance and exceptional dimensional stability after hardening. Watch parts, ABS brake components, shafts, test probes, automotive dashboard components
Sandvik 14AP A hardenable free-cutting carbon steel characterized by excellent machinability, good wear resistance and hardness after heat treatment. Hole punches, shafts
Stainless steel
Sandvik grade Description Typical applications
Sandvik 4C27A
(ASTM 420F)
A hardenable stainless chromium steel characterized by very good machinability, adequate hardness, high wear resistance and good corrosion resistance. Watch parts, shafts, various precision instruments, surgical needles, medical and dental tools
Sandvik 1802 A ferritic, soft magnetic, stainless steel combining superior corrosion properties with excellent machinability at high cutting speed (preferably 200 m/min or higher). It also exhibits good weldability and very good cold heading properties. Watch cases, couplings, inspection glass, pump components, measuring instruments, various types of valves, e.g. in solenoids

Sizes and tolerances

Sizes and tolerances

Sandvik free-cutting steels have tight and consistent tolerances, reducing machine set-up times and facilitating trouble-free production.

Drawn condition
Diameter tolerance
Diameter, mm
D1+/- mm
D2 +/- mm
D3 +/- mm
D4 +/- mm
Ovality
for D4 mm
0.05-0.125
0.007
0.004
0.002
-
-
>0.125-0.25
0.009
0.005
0.003
-
-
>0.25-0.50
0.011
0.007
0.004
0.003
0.002
>0.50-1.00
0.014
0.009
0.005
0.003
0.002
>1.00-1.60
0.018
0.011
0.006
0.004
0.002
>1.60-2.50
0.023
0.014
0.008
0.005
0.003
>2.50-4.00
0.030
0.018
0.010
-
-
>4.00-6.30
0.038
0.022
0.013
-
-
>6.30-10.00
0.048
0.028
-
-
-
>10.00-16.00
0.060
-
-
-
-
Ground condition
Diameter tolerance
Diameter, mm
h7 mm
h8 mm
h9 mm
h10 mm
h11 mm
>1-3
+0/-0.010
+0/-0.014
+0/-0.025
+0/-0.040
+0/-0.066
>3-6
+0/-0.012
+0/-0.018
+0/-0.030
+0/-0.048
+0/-0.075
>6-10
+0/-0.015
+0/-0.022
+0/-0.036
+0/-0.058
+0/-0.090
>10-18
+0/-0.018
+0/-0.027
+0/-0.043
+0/-0.070
+0/-0.110
>18-30
+0/-0.021
+0/-0.033
+0/-0.052
+0/-0.084
+0/-0.130
>30-50
+0/-0.025
+0/-0.039
+0/-0.062
+0/-0.100
+0/-0.160
>50-80
+0/-0.030
+0/-0.046
+0/-0.074
+0/-0.120
+0/-0.190

Ground material is delivered with ISO tolerance class h7, h8 or h9 for diameters up to 13 mm, depending on steel grade. Refer to the material datasheet for each specific steel grade.

Surfaces and delivery forms

Surfaces and delivery forms

Sandvik free-cutting steel can be delivered with a variety of surfaces, such as bright-drawn, CWC-drawn, CuSn-coated and ground surface. Delivery forms available are:

  1. Straigthened lengths (500-5000 mm)
  2. Coils
  3. Spool 28 (one-way plastic spool, OD 460 mm, ID 305 mm, W 105 mm)
  4. Spool 17 (returnable metallic spool, OD 750 mm, ID 406 mm, W 285 mm)

The delivery forms above refer to the numbers within brackets in the table.

Surfaces per grade and size range
Sandvik grade Drawn condition
(1*, 2, 3, 4)
CuSn coated
(1*, 2, 3)
Ground surface
(1*)
Sandvik Finemac 0.49-3 mm 0.50-3.2 mm 0.90-3.0 mm
Sandvik 20 AP 0.49-12.7 mm 0.50-3.2 mm 0.90-12.7 mm
Sandvik 14AP 0.49-12.7 mm 0.50-3.2 mm 0.90-12.7 mm
Sandvik 1802 1.0-11.0 mm - 2.0-80 mm
Sandvik 4C27A 0.40-10.0 mm - 0.90-10 mm

* Minimum diameter for straigthened lengths is 0.60 mm (2.0 mm for Sandvik 1802).