Description For particularly high demands with a very long service life under rolling loads. Product description As part of a linear guide, the role of the shaft places strict requirements on the materials used. Rexroth offers the ideal shaft material for any diameter range. Extremely consistent surface hardness and hardness depth combine with outstanding purity, consistent structure and balanced grading for extraordinarily long service life under rolling loads. Solid shafts with shaft diameters 20 mm to 8 m in length available upon request. Sections are combined for longer overall lengths. Linear bushings can simply be rolled over joints. Technical data Dimensional accuracy and tolerance zones The diameters of the precision steel shafts come in h6 and h7 tolerance zones. The adjacent table shows information on dimensional accuracy. The diameter tolerance of annealed shaft cross-sections vary slightly from the specified tolerance zone. Ød mm 3 5 6 8 10 12 14 15 16 18 20 22 24 25 30 32 35 38 40 45 50 55 60 70 80 100 110 Tolerance grade 1) h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 h6 h7 Diameter tolerance µm 0 - 6 0 - 8 0 - 12 0 - 8 0 - 12 0 - 9 0 - 15 0 - 9 0 - 15 0 - 11 0 - 18 0 - 11 0 - 18 0 - 11 0 - 18 0 - 11 0 - 18 0 - 11 0 - 18 0 - 13 0 - 21 0 - 13 0 - 21 0 - 13 0 - 21 0 - 13 0 - 21 0 - 13 0 - 21 0 - 16 0 - 25 0 - 16 0 - 25 0 - 16 0 - 25 0 - 16 0 - 25 0 - 16 0 - 25 0 - 16 0 - 25 0 - 19 0 - 30 0 - 19 0 - 30 0 - 19 0 - 30 0 - 19 0 - 30 0 - 22 0 - 35 0 - 22 0 - 35 t1 µm 3 4 5 4 5 4 6 4 6 5 8 5 8 5 8 5 8 5 8 6 9 6 9 6 9 6 9 6 9 7 11 7 11 7 11 7 11 7 11 7 11 8 13 8 13 8 13 8 13 10 15 10 15 t2 2) µm 4 5 8 5 8 6 9 6 9 8 11 8 11 8 11 8 11 8 11 9 13 9 13 9 13 9 13 9 13 11 16 11 16 11 16 11 16 11 16 11 16 13 19 13 19 13 19 13 19 15 22 15 22 t3 3) µm/m 150 120 100 Ra µm 0.32 1) Other tolerances upon request 2) Measurements if differences in diameter 3) The smallest possible value is 40 µm for lengths under 1 m. Straightness is measured based on ISO 13012. Measurement of straightness based on ISO 13012 The measuring points are evenly distributed between the support points and the shaft sections protruding past them. More supports are used accordingly for long, thin shafts. Straightness is half of the gauge measurement when turning the shaft 360°. Measurement of roundness The drawing shows the roundness of a raw shaft compared to a precision steel shaft. a) Raw shaft b) Precision shaft Shaft hardness The outer zone of the shaft is induction-hardened. Depending on the shaft diameter, the depth of hardness ranges from 0.4 to 2.4 mm. Linear and transverse surface hardness and depth of hardness are highly consistent. This ensures high dimensional consistency and long service life. The adjacent figure shows the cross-section and longitudinal section of a hardened and polished precision steel shaft. The hardened surface zone is made visible by caustic etc
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