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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
640.250
Standard request
 250,00 263,00 6,35
640.260
Standard request
 260,00 273,00 6,35
640.270
Standard request
 270,00 283,00 6,35
640.275
Standard request
 275,00 288,00 6,35
640.280
Standard request
 280,00 293,00 6,35
640.285
Standard request
 285,00 298,00 6,35
640.290
Standard request
 290,00 303,00 6,35
640.295
Standard request
 295,00 308,00 6,35
640.300
Standard request
 300,00 315,60 7,60
640.305
Standard request
 305,00 320,60 7,60
640.310
Standard request
 310,00 325,60 7,60
640.320
Standard request
 320,00 335,60 7,60
640.330
Standard request
 330,00 345,60 7,60
640.340
Standard request
 340,00 355,60 7,60
640.350
Standard request
 350,00 365,60 7,60
640.360
Standard request
 360,00 375,60 7,60
640.370
Standard request
 370,00 385,60 7,60
640.380
Standard request
 380,00 395,60 7,60
640.390
Standard request
 390,00 405,60 7,60
640.400
Standard request
 400,00 420,80 10,10
640.410
Standard request
 410,00 430,80 10,10
640.420
Standard request
 420,00 440,80 10,10
640.430
Standard request
 430,00 450,80 10,10
640.440
Standard request
 440,00 460,80 10,10
640.450
Standard request
 450,00 470,80 10,10
640.460
Standard request
 460,00 480,80 10,10
640.470
Standard request
 470,00 490,80 10,10
640.480
Standard request
 480,00 500,80 10,10
640.490
Standard request
 490,00 510,80 10,10
640.500
Standard request
 500,00 520,80 10,10
640.510
Standard request
 510,00 530,80 10,10
640.520
Standard request
 520,00 540,80 10,10
640.530
Standard request
 530,00 550,80 10,10
640.540
Standard request
 540,00 560,80 10,10
640.550
Standard request
 550,00 570,80 10,10
640.560
Standard request
 560,00 580,80 10,10
640.570
Standard request
 570,00 590,80 10,10
640.580
Standard request
 580,00 600,80 10,10
640.590
Standard request
 590,00 610,80 10,10
640.600
Standard request
 600,00 626,00 12,60
640.610
Standard request
 610,00 636,00 12,60
640.620
Standard request
 620,00 646,00 12,60
640.630
Standard request
 630,00 656,00 12,60
640.640
Standard request
 640,00 666,00 12,60
640.650
Standard request
 650,00 676,00 12,60
640.660
Standard request
 660,00 686,00 12,60
640.670
Standard request
 670,00 696,00 12,60
640.680
Standard request
 680,00 706,00 12,60
640.690
Standard request
 690,00 716,00 12,60
640.700
Standard request
 700,00 726,00 12,60
640.710
Standard request
 710,00 736,00 12,60
640.720
Standard request
 720,00 746,00 12,60
640.730
Standard request
 730,00 756,00 12,60
640.740
Standard request
 740,00 766,00 12,60
640.750
Standard request
 750,00 776,00 12,60
640.760
Standard request
 760,00 786,00 12,60
640.770
Standard request
 770,00 796,00 12,60
640.780
Standard request
 780,00 806,00 12,60
640.790
Standard request
 790,00 816,00 12,60
640.800
Standard request
 800,00 826,00 12,60
640.850
Standard request
 850,00 876,00 12,60
640.900
Standard request
 900,00 926,00 12,60
640.950
Standard request
 950,00 976,00 12,60
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