Tape Measure Steel
Tape measures feature pocket tapes, long tapes, and adhesive-backed tapes in a variety of lengths and styles. It consists of a metal strip with linear measurement markings. It is a common measuring tool. Its design allows for a measure of great length to be easily carried in pocket or toolkit and permits one to measure around curves or corners. Baomit strip steel meets the highest requirements made by tape measure manufacturers with precise thickness tolerances, good surface finish, and uniform microstructure. If you would like to learn more the quality of our strip steel then please contact our experts who will be very happy to advise you.
| Parameters | Recommendation |
| Thickness Tolerance | T2 |
| Roughness | Class 3 |
| Flatness | Class 3 |
| Surface | Bright or Blue Tempered |
| Edges | Slit / deburred |
| Hardness | 560 – 640 HV |
| Steel Grade | SK4, SK5 |
Our Advantages:
• Excellent wear resistance
• Precise thickness and width tolerances
• Maximum straightness deviation of 1 mm / 6 m
• Good surface finish
• Consistent, specially adapted microstructure
Steel Grades
| Comparison of Norms | ||
| JAPAN / JIS | EU / EN | Chemical Composition |
| SK4 | C100S | C: 0.90-1.00, Si: 0.10-0.35, Mn: 0.10-0.50, P: max 0.03, S: max 0.03, Cr: max 0.3, Ni: max 0.25, Cu: max 0.25 |
| SK5 | C90S | C: 0.80-0.90, Si: 0.10-0.35, Mn: 0.10-0.50, P: max 0.03, S: max 0.03, Cr: max 0.3, Ni: max 0.25, Cu: max 0.25 |
Thickness Tolerances
| Thickness (mm) | Tolerances ± mm | ||||
| T1 | T2 | T3 | T4 | T5 | |
| 0.020 – 0.040 | 0.004 | 0.003 | 0.002 | – | – |
| 0.040 – 0.100 | 0.006 | 0.005 | 0.004 | 0.003 | 0.002 |
| 0.100 – 0.125 | 0.007 | 0.005 | 0.004 | 0.003 | 0.002 |
| 0.125 – 0.160 | 0.009 | 0.006 | 0.005 | 0.004 | 0.003 |
| 0.160 – 0.200 | 0.010 | 0.007 | 0.005 | 0.004 | 0.003 |
| 0.200 – 0.250 | 0.011 | 0.008 | 0.006 | 0.004 | 0.003 |
| 0.250 – 0.400 | 0.015 | 0.011 | 0.008 | 0.006 | 0.004 |
| 0.400 – 0.600 | 0.020 | 0.014 | 0.010 | 0.007 | 0.005 |
| 0.600 – 0.800 | 0.023 | 0.017 | 0.012 | 0.008 | 0.006 |
| 0.800 – 1.000 | 0.027 | 0.019 | 0.013 | 0.009 | 0.007 |
| 1.000 – 1.250 | 0.034 | 0.024 | 0.017 | 0.012 | 0.008 |
| 1.250 – 1.600 | 0.039 | 0.028 | 0.020 | – | – |
| 1.600 – 1.750 | 0.046 | 0.033 | 0.023 | – | – |
Width Tolerances
| Thickness (mm) | Width (mm) | Tolerances ± mm | ||
| W1 | W2 | W3 | ||
| ≤0.25 | ≤50 | 0.10 | 0.07 | 0.05 |
| 50 – 125 | 0.15 | 0.11 | 0.07 | |
| >125 | 0.20 | 0.15 | 0.10 | |
| 0.25 – 0.50 | ≤50 | 0.15 | 0.11 | 0.07 |
| 50 – 125 | 0.20 | 0.15 | 0.10 | |
| >125 | 0.25 | 0.20 | 0.15 | |
| 0.50 – 1.00 | ≤50 | 0.20 | 0.15 | 0.10 |
| 50 – 125 | 0.25 | 0.20 | 0.15 | |
| >125 | 0.30 | 0.25 | 0.15 | |
| 1.00 – 1.60 | ≤50 | 0.20 | 0.15 | 0.10 |
| 50 – 125 | 0.30 | 0.25 | 0.15 | |
| >125 | 0.35 | 0.25 | 0.20 | |
| 1.60 – 1.75 | ≤50 | 0.30 | 0.20 | 0.15 |
| 50 – 125 | 0.35 | 0.30 | 0.20 | |
| >125 | 0.40 | 0.30 | 0.20 | |
Surface Roughness
Available in white polished, blue polished and yellow.
| Thickness (mm) | Roughness | ||
| Class 1 | Class 2 | Class 3 | |
| ≤0.50 | Ra≤ 0.30 µm Rt≤ 3.00 µm | Ra≤0.25 µm Rt≤ 2.50 µm | Ra≤ 0.20 µm Rt≤ 2.00 µm |
| 0.50 – 1.00 | Ra≤ 0.35 µm Rt≤ 3.50 µm | Ra≤ 0.25 µm Rt≤ 2.50 µm | Ra≤ 0.20 µm Rt≤ 2.00 µm |
| 1.00 – 1.75 | Ra≤ 0.40 µm Rt≤ 4.00 µm | Ra≤ 0.30 µm Rt≤ 3.00 µm | Ra≤ 0.30 µm Rt≤ 3.00 µm |
Flatness Deviation
Maximum flatness deviation per inch strip width.
| Thickness (mm) | Flatness Deviation | |||
| Class 1 | Class 2 | Class 3 | Class 4 | |
| 0.02 – 0.10 | P60 | P50 | P40 | P30 |
| 0.10 – 0.25 | P50 | P40 | P30 | P20 |
| 0.25 – 0.50 | P40 | P30 | P20 | P10 |
| 0.50 – 1.75 | P35 | P25 | P15 | P10 |
Straightness Deviation
| Strip Width (mm) | Measured Length (3m) | ||
| Class 1 | Class 2 | Class 3 | |
| ≤50 | 3 mm | 2 mm | 1 mm |
| 50 – 125 | 3 mm | 2 mm | 1 mm |
| >125 | 3 mm | 2 mm | 1 mm |
Hubei Baomit Steel Materials Co., Ltd.
ISO 9001: 2015 Certified Manufacturer of Hardened and Tempered (H & T) Strip Steel
