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8108 Double Box Wrench

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.

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304QF stainless steel tools technical parameters:
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

Physical property

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.

420 stainless steel tools parameters:
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

Physical property

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℃)

Parameters:

Number	S1*S2 (mm)	L (mm)	Weight (g)
8108-0810	8*10	115	32
8108-0911	9*11	125	37
8108-1012	10*12	140	55
8108-1214	12*14	145	70
8108-1417	14*17	165	100
8108-1719	17*19	185	132
8108-1922	19*22	200	180
8108-2224	22*24	220	240
8108-2427	24*27	255	320
8108-2730	27*30	280	385
8108-3032	30*32	295	465
8108-3036	30*36	330	600
8108-3641	36*41	365	935