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BECA 640

BECA 640
beca_640_3d_v1
beca_640_3d_v2

Description

The BECA 640 profile is a double acting composite rod seal composed of a rubber O'Ring or square ring and a polyamide friction ring.

Advantages

The square ring does not twist
Low friction coefficient
Excellent extrusion resistance
Compatible with hydraulic oils

Technical data

Temperature

-30°C/+100°C

Pressure

40 MPa

Speed

0.5 m/s

Medias

Mineral hydraulic oils
Fire-resistant liquids
Biocompatible fluids
Water
Others (contact our experts)

Applications

Agriculture
Mobile machinery
Hydraulic cylinders

Materials

Friction ring

Polyamide PA6

O'Ring or square ring

NBR 70 Shore A

Dimensions
Installation dimensions
Materials
Technical data

Dimensions

640.003, 640.004, 640.005, 640.006, 640.007, 640.008, 640.009, 640.010, 640.011, 640.012, 640.013, 640.014, 640.015, 640.016, 640.017, 640.018, 640.019, 640.020, 640.021, 640.022, 640.024, 640.025, 640.026, 640.027, 640.028, 640.029, 640.030, 640.032, 640.034, 640.035, 640.036, 640.038, 640.039, 640.040, 640.041, 640.042, 640.044, 640.045, 640.046, 640.047, 640.048, 640.050, 640.051, 640.052, 640.055, 640.056, 640.058, 640.060, 640.061, 640.062, 640.063, 640.065, 640.067, 640.068, 640.070, 640.072, 640.075, 640.078, 640.079, 640.080, 640.081, 640.082, 640.083, 640.084, 640.085, 640.086, 640.088, 640.090, 640.092, 640.095, 640.098, 640.100, 640.105, 640.108, 640.110, 640.115, 640.120, 640.125, 640.127, 640.130, 640.135, 640.138, 640.140, 640.145, 640.150, 640.155, 640.160, 640.165, 640.170, 640.175, 640.180, 640.185, 640.190, 640.195, 640.200, 640.210, 640.215, 640.220, 640.230, 640.240, 640.250, 640.260, 640.270, 640.275, 640.280, 640.285, 640.290, 640.295, 640.300, 640.305, 640.310, 640.320, 640.330, 640.340, 640.350, 640.360, 640.370, 640.380, 640.390, 640.400, 640.410, 640.420, 640.430, 640.440, 640.450, 640.460, 640.470, 640.480, 640.490, 640.500, 640.510, 640.520, 640.530, 640.540, 640.550, 640.560, 640.570, 640.580, 640.590, 640.600, 640.610, 640.620, 640.630, 640.640, 640.650, 640.660, 640.670, 640.680, 640.690, 640.700, 640.710, 640.720, 640.730, 640.740, 640.750, 640.760, 640.770, 640.780, 640.790, 640.800, 640.850, 640.900, 640.950
Installation drawingLogement Gorge Joint de tige - Housing Groove Gland Rod seal BECA 640

Installation dimensions

Housing Groove Gland Rod Seal - BECA 640

Installation dimensions

Rod diameter Groove diameter Groove width Radial section O'Ring
cross-section
Ød1 f8 ØD1 H9 L1 0/+0.20 S Ød2
3.0 - 11.9 d1 + 2.60 1.35 1.30 1.00
12.0 - 23.9 d1 + 4.00 2.00 2.00 1.78
24.0 - 33.9 d1 + 5.20 2.60 2.60 2.00
34.0 - 45.9 d1 + 6.50 3.20 3.25 2.62
46.0 - 58.9 d1 + 7.80 3.85 3.90 3.00
59.0 - 80.9 d1 + 9.10 4.50 4.55 3.53
81.0 - 129.9 d1 + 10.20 5.10 5.20 4.00
130.0 - 199.9 d1 + 11.70 5.70 5.85 5.00
200.0 - 299.9 d1 + 13.00 6.35 6.50 5.33
300.0 - 399.9 d1 + 15.60 7.60 7.80 6.99
400.0 - 599.9 d1 + 20.80 10.10 10.40 8.40
600.0 - ** d1 + 26.00 12.60 13.00 12.00

For special applications > 40 MPa, we recommend using an H8/f8 tolerance (groove/rod) or selecting other more suitable materials. Please contact our experts.

Materials

Polyamide - PA6G

There are different types of polyamides, more commonly known as "nylons". The most important are: PA 6, PA 66, PA 11 and PA 12. These types of nylons have different physical properties, mainly their composition and the structure of their molecular chains.
The PA6G polyamide is characterised by its stiffness, strong sliding abilities, excellent machinability and excellent resistance to wear and abrasion.

Advantages Good mechanical resistance, stiffness, hardness and resilience
Good fatigue resistance
Strong shock absorbing potential
Good sliding properties
Excellent wear resistance
Good electrical insulation properties
Good resistance to high-energy radiation
Good machinability
Limits Dimensional stability is not as good as POM
Temperature range -30°C / +120°C (very short term peak at 180°C)

NBR

Nitrile rubber (NBR) is the general term for acrylonitrile-butadiene copolymer. The ACN content can vary between 18% and 50%. While the acrylonitrile content is important, the resistance to oil and fuel is more so. Conversely, the elasticity and compression set are not as good. The NBR has good mechanical properties and good wear resistance. However, its resistance to atmospheric agents and the ozone is relatively low.

Chemical resistance Aliphatic hydrocarbons (propane, butane, petroleum, diesel fuel)
Mineral oils and greases
Fire-resistant fluids (HFA, HFB and HFC)
Diluted acids, low-temperature alkaline and saline solutions
Water (up to +100°C max)
Compatibility issue Fuels with high aromatic content
Aromatic hydrocarbons (benzene)
Chlorinated hydrocarbons (trichlorethylene)
Polar solvents (ketone, acetone, acetic acid, ethylene-ester)
Strong acids
Glycol-based brake fluids
Atmospheric and ozone agents
Temperature range -30°C/+100°C
-40°C / +100°C with our low-temperature NBR

Technical data

Housing Groove Gland Rod Seal - BECA 640

Extrusion gaps

Pressure
MPa
Radial extrusion gap
F/2
20 MPa 0.25
35 MPa 0.20
40 MPa 0.15

Surface roughness

Roughness Dynamic surface area Static surface area Groove flanks
Ra 0.05 - 0.2 µm ≤ 1.6 µm ≤ 3.2 µm
Rz 0.4 - 1.6 µm ≤ 6.3 µm ≤ 10.0 µm
Rmax 0.63 - 2.5 µm ≤ 10.0 µm ≤ 16.0 µm

Chamfers and radius

Radial section
S
Radius
R1
Radius
R2
Chamfer
C
1.30 0.30 0.10 2.00
2.00 0.30 0.20 2.00
2.60 0.30 0.20 2.00
3.25 0.30 0.20 3.00
3.90 0.30 0.20 3.00
4.55 0.30 0.20 4.00
5.20 0.30 0.30 4.50
5.85 0.30 0.30 5.00
6.50 0.30 0.40 5.50
7.80 0.30 0.40 6.00
10.40 0.30 0.60 8.00
13.00 0.30 0.80 10.00
163 dimensions found
640.003
Standard request
3,00 5,60 1,35
640.004
Standard request
4,00 6,60 1,35
640.005
Standard request
5,00 7,60 1,35
640.006
Standard request
6,00 8,60 1,35
640.007
Standard request
7,00 9,60 1,35
640.008
Standard request
8,00 10,60 1,35
640.009
Standard request
9,00 11,60 1,35
640.010
Standard request
10,00 12,60 1,35
640.011
Standard request
11,00 13,60 1,35
640.012
Standard request
12,00 16,00 2,00
640.013
Standard request
13,00 17,00 2,00
640.014
Standard request
14,00 18,00 2,00
640.015
Standard request
15,00 19,00 2,00
640.016
Standard request
16,00 20,00 2,00
640.017
Standard request
17,00 21,00 2,00
640.018
Standard request
18,00 22,00 2,00
640.019
Standard request
19,00 23,00 2,00
640.020
Standard request
20,00 24,00 2,00
640.021
Standard request
21,00 25,00 2,00
640.022
Standard request
22,00 26,00 2,00
640.024
Standard request
24,00 29,20 2,60
640.025
Standard request
25,00 30,20 2,60
640.026
Standard request
26,00 31,20 2,60
640.027
Standard request
27,00 32,20 2,60
640.028
Standard request
28,00 33,20 2,60
640.029
Standard request
29,00 34,20 2,60
640.030
Standard request
30,00 35,20 2,60
640.032
Standard request
32,00 37,20 2,60
640.034
Standard request
34,00 40,50 3,20
640.035
Standard request
35,00 41,50 3,20
640.036
Standard request
36,00 42,50 3,20
640.038
Standard request
38,00 44,50 3,20
640.039
Standard request
39,00 45,50 3,20
640.040
Standard request
40,00 46,50 3,20
640.041
Standard request
41,00 47,50 3,20
640.042
Standard request
42,00 48,50 3,20
640.044
Standard request
44,00 50,50 3,20
640.045
Standard request
45,00 51,50 3,20
640.046
Standard request
46,00 53,80 3,85
640.047
Standard request
47,00 54,80 3,85
640.048
Standard request
48,00 55,80 3,85
640.050
Standard request
50,00 57,80 3,85
640.051
Standard request
51,00 58,80 3,85
640.052
Standard request
52,00 59,80 3,85
640.055
Standard request
55,00 62,80 3,85
640.056
Standard request
56,00 63,80 3,85
640.058
Standard request
58,00 65,80 3,85
640.060
Standard request
60,00 69,10 4,50
640.061
Standard request
61,00 70,10 4,50
640.062
Standard request
62,00 71,10 4,50
640.063
Standard request
63,00 72,10 4,50
640.065
Standard request
65,00 74,10 4,50
640.067
Standard request
67,00 76,10 4,50
640.068
Standard request
68,00 77,10 4,50
640.070
Standard request
70,00 79,10 4,50
640.072
Standard request
72,00 81,10 4,50
640.075
Standard request
75,00 84,10 4,50
640.078
Standard request
78,00 87,10 4,50
640.079
Standard request
79,00 88,10 4,50
640.080
Standard request
80,00 89,10 4,50
640.081
Standard request
81,00 91,40 5,10
640.082
Standard request
82,00 92,40 5,10
640.083
Standard request
83,00 93,40 5,10
640.084
Standard request
84,00 94,40 5,10
640.085
Standard request
85,00 95,40 5,10
640.086
Standard request
86,00 96,40 5,10
640.088
Standard request
88,00 98,40 5,10
640.090
Standard request
90,00 100,40 5,10
640.092
Standard request
92,00 102,40 5,10
640.095
Standard request
95,00 105,40 5,10
640.098
Standard request
98,00 108,40 5,10
640.100
Standard request
100,00 110,40 5,10
640.105
Standard request
105,00 115,40 5,10
640.108
Standard request
108,00 118,40 5,10
640.110
Standard request
110,00 120,40 5,10
640.115
Standard request
115,00 125,40 5,10
640.120
Standard request
120,00 130,40 5,10
640.125
Standard request
125,00 135,40 5,10
640.127
Standard request
127,00 137,40 5,10
640.130
Standard request
130,00 141,70 5,70
640.135
Standard request
135,00 146,70 5,70
640.138
Standard request
138,00 149,70 5,70
640.140
Standard request
140,00 151,70 5,70
640.145
Standard request
145,00 156,70 5,70
640.150
Standard request
150,00 161,70 5,70
640.155
Standard request
155,00 166,70 5,70
640.160
Standard request
160,00 171,70 5,70
640.165
Standard request
165,00 176,70 5,70
640.170
Standard request
170,00 181,70 5,70
640.175
Standard request
175,00 186,70 5,70
640.180
Standard request
180,00 191,70 5,70
640.185
Standard request
185,00 196,70 5,70
640.190
Standard request
190,00 201,70 5,70
640.195
Standard request
195,00 206,70 5,70
640.200
Standard request
200,00 213,00 6,35
640.210
Standard request
210,00 223,00 6,35
640.215
Standard request
215,00 228,00 6,35
640.220
Standard request
220,00 233,00 6,35
640.230
Standard request
230,00 243,00 6,35
640.240
Standard request
240,00 253,00 6,35
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