8108 Double Box Wrench
The code No.8108 stainless steel double box wrench is used to tighten or loosen bolts and nuts, suitable for use where space is limited instead of double end open spanner. It is made of stainless steel processed by drop forging, and is certified by DIN 837 standard.
Chemical composition: %
| C | Si | Mn | Cr | Ni | S | P | N |
| ≤0.08 | ≤0.85 | ≤1.8 | 18.0-20 | 8.0-10.5 | ≤0.03 | ≤0.045 | ≤0.2 |
- Tensile strength: σb(MPa)≥520
- Tensile strength: σb(MPa)≥520
- Offset yield strength:σ0.2(MPa)≥205
- Elongation:δ5(%)≥40
- Contraction percentage of area: z(%)=60
- Density (20℃, g/cm3): 7.93
- Hardness: HRC15-25
- Melting point (℃): 1398~1454
- Specific heat (0~100℃, KJ·kg-1K-1): 0.50
- Heat conductivity (W·m-1·K-1): (100℃) 16.3, (500℃) 21.5
- Linear expansion coefficient (10-6·K-1): (0~100℃) 17.2; (0~500℃) 18.4
- Resistivity (20℃, 10-6Ω·m): 0.73
- Magnetism: ≤5nT within 10cm in the magnetic field
Martensitic stainless steel (cutting tools stainless steel): representative grade: 420
The mechanical property of martensitic stainless steel is adjustable by heat treatment. Generally speaking, it is a type of hardenable stainless steel. It is hardened after quenching. Different tempering temperatures give different combinations of hardness and toughness. This stainless steel is widely used in such industries where the requirements of corrosion resistance is not very high, plus the cutting tools and machine elements have high requirements on strength.
Chemical composition: %
| C | Si | Mn | Cr | Ni | S | P |
| 0.16-0.25 | ≤1.00 | ≤1.00 | 12.0-14.0 | ≤0.75 | ≤0.03 | ≤0.04 |
- Tensile strength: σb(MPa)≥365
- Offset yield strength:σ0.2(MPa)≥440
- Elongation:δ5(%)≥20
- Contraction percentage of area: z(%)=50
- Density (20℃, g/cm3): 7.75
- Hardness: HRC35-45
- Melting point (℃): 1427
- Specific heat (25℃, J·kg-1K-1): 460
- Heat conductivity (W·m-1·K-1): 24.9
- Linear expansion coefficient (mm/℃): (at20-100℃)
| Number | S1*S2 (mm) | L (mm) | Weight (g) |
| | 8*10 | 115 | 32 |
| | 9*11 | 125 | 37 |
| | 10*12 | 140 | 55 |
| | 12*14 | 145 | 70 |
| | 14*17 | 165 | 100 |
| | 17*19 | 185 | 132 |
| | 19*22 | 200 | 180 |
| | 22*24 | 220 | 240 |
| | 24*27 | 255 | 320 |
| | 27*30 | 280 | 385 |
| | 30*32 | 295 | 465 |
| | 30*36 | 330 | 600 |
| | 36*41 | 365 | 935 |
