BECA 008

Back-up rings

BECA 008

Description

The BECA 008 profile is an uncut back-up ring with a concave shape that allows it to fit snugly against the O'Ring. The ring is systematically assembled in tandem with an O'Ring and an X'Ring.

Advantages

Preferable for use in static applications
May be used for alternating movement applications
Large contact surface area, which protects the O'Ring from deformation caused by pulsating pressures
Easy assembly by deformation
Its production method makes it an economic solution

Technical data

Temperature	-30°C/+200°C
Pressure	< 250 MPa in static applications < 20 MPa in alternating applications
Speed	2 m/s in alternating applications
Medias	The majority of liquids, or gaseous or chemical fluids, depending on the type of material selected. Refer to our fluids-materials compatibility guide.

Applications

Automotive
Hydraulic equipment
Mobile machinery
Machine tools
Injection presses
Valves
Hydraulic cylinders

Materials

NBR 90 Shore A as standard
FKM 90 Shore A
Other materials may be used

Download

Product catalog - O'Rings and Back-up rings

Series	Rod diameter	Bore diameter	Groove width	Groove width	Radius	Back-up ring dimensions	O'Ring part number	O'Ring dimensions
Ød5 f7	ØD4 H9	L2 0/+0.20	L3 0/+0.20	R1 ±0.20	Ød x ØD x W0 x A x r1	Ød1 x Ød2

Dimensions

Materials

Design guidelines

Dimensions

008.1A037, 008.1A038, 008.1A039, 008.1A040, 008.1A041, 008.1A042, 008.1A043, 008.1A046, 008.1A048, 008.1A050, 008.1A052, 008.1A053, 008.1A054, 008.1A055, 008.1A056, 008.1A057, 008.1A058, 008.1A059, 008.1A060, 008.1A061, 008.1A062, 008.1A063, 008.1A064, 008.1A065, 008.1A066, 008.1A067, 008.1A068, 008.1A069, 008.1A070, 008.1A071, 008.1A072, 008.1A073, 008.1A074, 008.1A075, 008.1A076, 008.1A077, 008.1A078, 008.1A079, 008.1A080, 008.1A081, 008.1A082, 008.1A083, 008.1A084, 008.1A085, 008.1A086, 008.1A087, 008.1A088, 008.1A179, 008.1A180, 008.1A181, 008.1A182, 008.1A183, 008.1A184, 008.1A185, 008.1A186, 008.1A266, 008.1A267, 008.1A268, 008.1A269, 008.1A270, 008.1A271, 008.1A272, 008.1A201, 008.1A205, 008.1A207, 008.1A208, 008.1A209, 008.1A210, 008.1A211, 008.1A212, 008.1A213, 008.1A214, 008.1A215, 008.1A216, 008.1A217, 008.1A218, 008.1A219, 008.1A220, 008.1A221, 008.1A222, 008.1A223, 008.1A224, 008.1A225, 008.1A226, 008.1A227, 008.1A228, 008.1A229, 008.1A230, 008.1A231, 008.1A232, 008.1A233, 008.1A234, 008.1A235, 008.1A236, 008.1A237, 008.1A238, 008.1A239, 008.1A240, 008.1A241, 008.1A242, 008.1A243, 008.1A244, 008.1A245, 008.1A246, 008.1A247, 008.1A248, 008.1A249, 008.1A250, 008.1A251, 008.1A252, 008.1A253, 008.1A254, 008.1A255, 008.1A256, 008.1A257, 008.1A258, 008.1A259, 008.1A260, 008.1A261, 008.1A262, 008.1A263, 008.1A264, 008.1A265, 008.1A358, 008.1A359, 008.1A360, 008.1A361, 008.1A362, 008.1A363, 008.1A364, 008.1A365, 008.1A366, 008.1A466, 008.1A467, 008.1A468, 008.1A469, 008.1A470, 008.1A471, 008.1A472, 008.1A473, 008.1A474, 008.1A475, 008.1A476, 008.1A477, 008.1A478, 008.1A382, 008.1A385, 008.1A388, 008.1A391, 008.1A394, 008.1A397, 008.1A400, 008.1A403, 008.1A406, 008.1A409, 008.1A412, 008.1A414, 008.1A416, 008.1A417, 008.1A418, 008.1A419, 008.1A420, 008.1A421, 008.1A422, 008.1A423, 008.1A424, 008.1A425, 008.1A426, 008.1A427, 008.1A428, 008.1A429, 008.1A430, 008.1A431, 008.1A432, 008.1A433, 008.1A434, 008.1A435, 008.1A436, 008.1A437, 008.1A438, 008.1A439, 008.1A440, 008.1A441, 008.1A442, 008.1A443, 008.1A444, 008.1A445, 008.1A446, 008.1A447, 008.1A448, 008.1A449, 008.1A450, 008.1A451, 008.1A452, 008.1A453, 008.1A454, 008.1A455, 008.1A456, 008.1A457, 008.1A458, 008.1A459, 008.1A460, 008.1A461, 008.1A462, 008.1A463, 008.1A464, 008.1A465, 008.1A528, 008.1A529, 008.1A530, 008.1A531, 008.1A532, 008.1A533, 008.1A534, 008.1A535, 008.1A536, 008.1A537, 008.1A538, 008.1A539, 008.1A540, 008.1A541, 008.1A542, 008.1A543, 008.1A544, 008.1A545, 008.1A546, 008.1A547, 008.1A548, 008.1A549, 008.1A550, 008.1A551, 008.1A552, 008.1A553, 008.1A554, 008.1A555, 008.1A557, 008.1A558, 008.1A560, 008.1A561, 008.1A562, 008.1A564, 008.1A565, 008.1A566, 008.1A568, 008.1A569, 008.1A570, 008.1A572, 008.1A573, 008.1A574, 008.1A576, 008.1A578, 008.1A580, 008.1A582, 008.1A584, 008.1A586, 008.1A588, 008.1A590, 008.1A592, 008.1A594, 008.1A596, 008.1A597, 008.1A598, 008.1A599, 008.1A600, 008.1A601, 008.1A602, 008.1A603, 008.1A604, 008.1A605, 008.1A606, 008.1A607, 008.1A608, 008.1A609, 008.1A610, 008.1A611, 008.1A612, 008.1A613, 008.1A614, 008.1A615, 008.1A616, 008.1A617, 008.1A618, 008.1A619, 008.1A620, 008.1A621, 008.1A622, 008.1A623, 008.1A624, 008.1A625, 008.1A626, 008.1A627, 008.1A628, 008.1A629, 008.1A630, 008.1A738, 008.1A740, 008.1A741, 008.1A742, 008.1A744, 008.1A745, 008.1A746, 008.1A748, 008.1A749, 008.1A750, 008.1A751, 008.1A752, 008.1A753, 008.1A755, 008.1A758, 008.1A761, 008.1A763, 008.1A765, 008.1A767, 008.1A769, 008.1A771, 008.1A773, 008.1A775, 008.1A777, 008.1A779, 008.1A781, 008.1A783, 008.1A785, 008.1A787, 008.1A788, 008.1A789, 008.1A790, 008.1A791, 008.1A792, 008.1A793, 008.1A794, 008.1A795, 008.1A796, 008.1A797, 008.1A798, 008.1A799, 008.1A800, 008.1A801, 008.1A802, 008.1A803, 008.1A804, 008.1A805, 008.1A806, 008.1A807, 008.1A808, 008.1A809, 008.1A203

Installation drawing Logement Gorge Bague anti-extrusion - Housing Groove Back-up ring - BECA 008

Materials

NBR (Nitrile Butadiene Rubber)

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 (short-term peak at +120°C) -40°C / +100°C with particular NBRs

FKM (fluorinated rubber)

Depending on their structure and fluorine content, the chemical resistance and resistance to the cold in fluororubbers can vary. This FKM-based rubber is very often used for high-temperature hydraulics and pneumatics, for industrial valves, injection/fuel systems, motor seals and high-vacuum systems.

Chemical resistance	Mineral oils and greases, ASTM n°1, IRM 902 and IRM 903 oils. Fire-resistant liquids (HFD) Silicone oils and greases Mineral and vegetable oils and greases Aliphatic hydrocarbons (propane, butane, petroleum) Aromatic hydrocarbons (benzene, toluene) Chlorinated hydrocarbons (trichlorethylene) Fuel (including high alcohol content) Atmospheric and ozone agents
Compatibility issue	Glycol-based brake fluids Ammonia gas Organic acids with a low molecular weight (formic and acetic acids)
Temperature range	-20°C / +200°C (short-term peak at +230°C) -40°C / +200°C with particular FKMs

Design guidelines

Housing Groove Back-up Ring - BECA 008

Installation dimensions for rubber BECA 008 according to standard AS 568A.

Series	O'Ring	Back-up ring			Housing dimensions				Radius R1 ±0.2	Diametral clearance F
	Cross-section Ød2	Radial height W0	Thickness T0	Thickness A	Cylinder sealing	Rod sealing	Groove width
	Cross-section Ød2	Radial height W0	Thickness T0	Thickness A	Groove diameter Ød3 0/-0.10	Groove diameter ØD6 +0.10/0	L2 0/+0.20	L3 0/+0.20
004 - 050	1.78	1.35	1.24	1.14	D4 - 2.90	d5 + 2.90	3.60	5.00	0.25	0.12
102 - 178	2.62	2.18	1.35	1.14	D4 - 4.50	d5 + 4.50	4.50	5.90	0.25	0.12
201 - 284	3.53	3.00	1.27	1.02	D4 - 6.20	d5 + 6.20	5.60	7.00	0.25	0.15
309 - 395	5.33	4.65	1.93	1.52	D4 - 9.40	d5 + 9.40	7.90	9.60	0.25	0.15
425 - 475	6.99	5.99	2.97	2.44	D4 - 12.20	d5 + 12.20	10.70	13.20	0.25	0.20

346 dimensions found

008.1A745 Standard request	8-430	130,00	143,00	10,70	13,20	0,25	131,47 x 143,45 x 5,99 x 2,44 x 8,74	010.1A745	129,54 x 6,99
008.1A746 Standard request	8-431	134,00	147,00	10,70	13,20	0,25	134,65 x 146,63 x 5,99 x 2,44 x 8,74	010.1A746	132,72 x 6,99
008.1A748 Standard request	8-432	137,00	150,00	10,70	13,20	0,25	137,82 x 149,80 x 5,99 x 2,44 x 8,74	010.1A748	135,89 x 6,99
008.1A749 Standard request	8-433	140,00	152,00	10,70	13,20	0,25	141,00 x 152,98 x 5,99 x 2,44 x 8,74	010.1A749	139,07 x 6,99
008.1A750 Standard request	8-434	143,00	156,00	10,70	13,20	0,25	144,17 x 156,15 x 5,99 x 2,44 x 8,74	010.1A750	142,24 x 6,99
008.1A751 Standard request	8-435	146,00	159,00	10,70	13,20	0,25	147,35 x 159,35 x 5,99 x 2,44 x 8,74	010.1A751	145,42 x 6,99
008.1A752 Standard request	8-436	150,00	162,00	10,70	13,20	0,25	150,52 x 162,50 x 5,99 x 2,44 x 8,74	010.1A752	148,59 x 6,99
008.1A753 Standard request	8-437	153,00	165,00	10,70	13,20	0,25	153,70 x 165,68 x 5,99 x 2,44 x 8,74	010.1A753	151,77 x 6,99
008.1A755 Standard request	8-438	159,00	172,00	10,70	13,20	0,25	159,36 x 171,34 x 5,99 x 2,44 x 8,74	010.1A755	158,12 x 6,99
008.1A758 Standard request	8-439	165,00	178,00	10,70	13,20	0,25	165,71 x 177,69 x 5,99 x 2,44 x 8,74	010.1A758	164,47 x 6,99
008.1A761 Standard request	8-440	172,00	184,00	10,70	13,20	0,25	172,06 x 184,04 x 5,99 x 2,44 x 8,74	010.1A761	170,82 x 6,99
008.1A763 Standard request	8-441	178,00	190,50	10,70	13,20	0,25	178,41 x 190,39 x 5,99 x 2,44 x 8,74	010.1A763	177,17 x 6,99
008.1A765 Standard request	8-442	185,00	197,00	10,70	13,20	0,25	184,76 x 196,74 x 5,99 x 2,44 x 8,74	010.1A765	183,52 x 6,99
008.1A767 Standard request	8-443	190,00	203,00	10,70	13,20	0,25	191,11 x 203,09 x 5,99 x 2,44 x 8,74	010.1A767	189,87 x 6,99
008.1A769 Standard request	8-444	197,00	210,00	10,70	13,20	0,25	197,46 x 209,44 x 5,99 x 2,44 x 8,74	010.1A769	196,22 x 6,99
008.1A771 Standard request	8-445	203,00	216,00	10,70	13,20	0,25	203,81 x 215,79 x 5,99 x 2,44 x 8,74	010.1A771	202,57 x 6,99
008.1A773 Standard request	8-446	216,00	229,00	10,70	13,20	0,25	216,51 x 228,49 x 5,99 x 2,44 x 8,74	010.1A773	215,27 x 6,99
008.1A775 Standard request	8-447	229,00	241,00	10,70	13,20	0,25	229,21 x 241,19 x 5,99 x 2,44 x 8,74	010.1A775	227,97 x 6,99
008.1A777 Standard request	8-448	241,00	254,00	10,70	13,20	0,25	241,91 x 253,90 x 5,99 x 2,44 x 8,74	010.1A777	240,67 x 6,99
008.1A779 Standard request	8-449	254,00	267,00	10,70	13,20	0,25	254,61 x 266,59 x 5,99 x 2,44 x 8,74	010.1A779	253,37 x 6,99
008.1A781 Standard request	8-450	267,00	280,00	10,70	13,20	0,25	267,31 x 279,29 x 5,99 x 2,44 x 8,74	010.1A781	266,07 x 6,99
008.1A783 Standard request	8-451	280,00	292,00	10,70	13,20	0,25	280,01 x 292,99 x 5,99 x 2,44 x 8,74	010.1A783	278,77 x 6,99
008.1A785 Standard request	8-452	292,00	305,00	10,70	13,20	0,25	292,71 x 304,71 x 5,99 x 2,44 x 8,74	010.1A785	291,47 x 6,99
008.1A787 Standard request	8-453	305,00	218,00	10,70	13,20	0,25	305,41 x 317,39 x 5,99 x 2,44 x 8,74	010.1A787	304,17 x 6,99
008.1A788 Standard request	8-454	318,00	330,00	10,70	13,20	0,25	318,11 x 330,09 x 5,99 x 2,44 x 8,74	010.1A788	316,87 x 6,99
008.1A789 Standard request	8-455	330,00	343,00	10,70	13,20	0,25	330,81 x 342,79 x 5,99 x 2,44 x 8,74	010.1A789	329,57 x 6,99
008.1A790 Standard request	8-456	343,00	356,00	10,70	13,20	0,25	343,51 x 355,51 x 5,99 x 2,44 x 8,74	010.1A790	342,47 x 6,99
008.1A791 Standard request	8-457	356,00	368,00	10,70	13,20	0,25	356,21 x 368,19 x 5,99 x 2,44 x 8,74	010.1A791	354,97 x 6,99
008.1A792 Standard request	8-458	368,00	381,00	10,70	13,20	0,25	368,90 x 380,88 x 5,99 x 2,44 x 8,74	010.1A792	367,67 x 6,99
008.1A793 Standard request	8-459	381,00	394,00	10,70	13,20	0,25	381,61 x 393,59 x 5,99 x 2,44 x 8,74	010.1A793	380,37 x 6,99
008.1A794 Standard request	8-460	394,00	406,00	10,70	13,20	0,25	394,31 x 406,19 x 5,99 x 2,44 x 8,74	010.1A794	393,07 x 6,99
008.1A795 Standard request	8-461	407,00	419,00	10,70	13,20	0,25	406,50 x 418,48 x 5,99 x 2,44 x 8,74	010.1A795	405,26 x 6,99
008.1A796 Standard request	8-462	420,00	432,00	10,70	13,20	0,25	419,20 x 431,18 x 5,99 x 2,44 x 8,74	010.1A796	417,96 x 6,99
008.1A797 Standard request	8-463	432,00	444,50	10,70	13,20	0,25	431,90 x 443,88 x 5,99 x 2,44 x 8,74	010.1A797	430,66 x 6,99
008.1A798 Standard request	8-464	445,00	457,00	10,70	13,20	0,25	444,60 x 456,58 x 5,99 x 2,44 x 8,74	010.1A798	443,36 x 6,99
008.1A799 Standard request	8-465	458,00	470,00	10,70	13,20	0,25	457,30 x 469,28 x 5,99 x 2,44 x 8,74	010.1A799	456,06 x 6,99
008.1A800 Standard request	8-466	470,00	483,00	10,70	13,20	0,25	470,00 x 481,98 x 5,99 x 2,44 x 8,74	010.1A800	468,76 x 6,99
008.1A801 Standard request	8-467	483,00	495,00	10,70	13,20	0,25	482,70 x 494,68 x 5,99 x 2,44 x 8,74	010.1A801	481,38 x 6,99
008.1A802 Standard request	8-468	495,00	508,00	10,70	13,20	0,25	495,40 x 507,38 x 5,99 x 2,44 x 8,74	010.1A802	494,16 x 6,99
008.1A803 Standard request	8-469	508,00	521,00	10,70	13,20	0,25	508,10 x 520,08 x 5,99 x 2,44 x 8,74	010.1A803	506,86 x 6,99
008.1A804 Standard request	8-470	533,00	546,00	10,70	13,20	0,25	533,50 x 545,48 x 5,99 x 2,44 x 8,74	010.1A804	532,26 x 6,99
008.1A805 Standard request	8-471	559,00	572,00	10,70	13,20	0,25	558,90 x 570,88 x 5,99 x 2,44 x 8,74	010.1A805	557,66 x 6,99
008.1A806 Standard request	8-472	584,00	597,00	10,70	13,20	0,25	584,30 x 596,28 x 5,99 x 2,44 x 8,74	010.1A806	582,68 x 6,99
008.1A807 Standard request	8-473	610,00	622,00	10,70	13,20	0,25	609,70 x 621,68 x 5,99 x 2,44 x 8,74	010.1A807	608,08 x 6,99
008.1A808 Standard request	8-474	635,00	648,00	10,70	13,20	0,25	635,10 x 647,08 x 5,99 x 2,44 x 8,74	010.1A808	633,48 x 6,99
008.1A809 Standard request	8-475	660,00	673,00	10,70	13,20	0,25	660,50 x 672,48 x 5,99 x 2,44 x 8,74	010.1A809	658,88 x 6,99