BECA 86N

Rotary seals / PTFE shaft seals

BECA 86N

Description

The BECA 86N profile is a machined virgin or filled PTFE seal ring consisting of two primary lips for dynamic sealing against the main fluid and an O-ring for static sealing. The primary sealing lips can be delivered preformed by a mandrel depending on the mounting direction.
As the sealing lip is not spring-loaded, this allows the profile to operate at higher speeds. The profile is designed with a metal cage to give stability to the joint under stress.

Advantages

Low friction coefficient; no stick-slip effect on start up
Excellent abrasion resistance
Effective in dry or poorly lubricated environments
Wide temperature range accepted
Excellent chemical inertness

Technical data

Temperature	-30°C/+200°C
Pressure	In dynamic applications : 1.00 MPa
Speed	15 m/s
PV maximum	PV (m/s x MPa) 7.00 in lubricated medium PV (m/s x MPa) 1.70 in dry environment

Applications

Aeronautics
Food industry
General industry
Medical
Electric motors
Motors and pumps
Robotics

Materials

Profiled seal

Virgin PTFE
Carbon filled PTFE
Graphite filled PTFE
PTFE filled with glass fibers + MOS2

Metal cage

NBR 70 Shore A
FKM 70 Shore A
EPDM 70 Shore A
HNBR 70 Shore A
VMQ 70 Shore A

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Dimensions

Materials

Conditions
for use

Shaft design

Housing design

Assembly recommendations

Dimensions

Installation drawing Layout diagram BECA 86N

Materials

Friction ring					O'ring				Surface contact area
Standard code	ISO code	Material	Color	Characteristics	Code	Type of material	Service temperature	Metal cage	Surface contact area
DP	P	Virgin PTFE	White	Chemical resistance Impermeability Dielectric Anti-stick Low friction coefficient Food industry	K6	NBR 70 Shore A	-30°C / +100°C	AISI 1070-1090 AISI 304	Steel Stainless steel Chrome steel Aluminum Bronze Cast iron Treated surface
					G6	FKM 70 Shore A	-20°C / +200°C
					C6	EPDM 70 Shore A	-45°C / +150°C
					F6	VMQ 70 Shore A	-60°C / +200°C
DC	C	PTFE + 25% Carbone	Grey	Improvement Wear properties Compression resistance Good resistance to chemicals Thermal and electrical conductivity Anti-static Powerful in dynamic applications with compression	K6	NBR 70 Shore A	-30°C / +100°C
					G6	FKM 70 Shore A	-20°C / +200°C
					C6	EPDM 70 Shore A	-45°C / +150°C
CG	C	PTFE + 23% Carbon + 2%Graphite	Black		K6	NBR 70 Shore A	-30°C / +100°C
					G6	FKM 70 Shore A	-20°C / +200°C
					C6	EPDM 70 Shore A	-45°C / +150°C
DV	V	PTFE + 25 % Glass	Blue	Improvement Wear properties Mechanical outfit Slightly more abrasive but phenomenon corrected by the addition of MOS2 Chemical and dielectric properties preserved Well suited to motion applications simultaneous rotating and reciprocating	K6	NBR 70 Shore A	-30°C / +100°C		Steel Chrome steel Cast iron
DV	V	PTFE + 25 % Glass	Blue		G6	FKM 70 Shore A	-20°C / +200°C
VM	M	PTFE + 15 % Glass + 5% MoS2	Grey		K6	NBR 70 Shore A	-30°C / +100°C
VM	M	PTFE + 15 % Glass + 5% MoS2	Grey		G6	FKM 70 Shore A	-20°C / +200°C
DG	G	PTFE + 15% Graphite	Black	Improvement Wear properties Reduced wear of metal parts Self-lubrication Thermal and electrical conductivity Low permeability Good coefficient of friction Anti static Powerful in dynamic applications with self-lubrication	K6	NBR 70 Shore A	-30°C / +100°C		Steel Stainless steel Chrome steel Aluminum Bronze Cast iron Treated surface
					G6	FKM 70 Shore A	-20°C / +200°C
					C6	EPDM 70 Shore A	-45°C / +150°C
DB	B	PTFE + 60% Bronze	Dark brown	Improvement Wear properties Resistance to deformation and creep Compressive strength Self-lubrication Electrical and thermal conductivity Does not alter metal parts Loss of hold with certain chemicals Use for dynamic seals with high compression and low wear levels	K6	NBR 70 Shore A	-30°C / +100°C		Steel Chrome steel Cast iron
DB	B	PTFE + 60% Bronze	Dark brown		G6	FKM 70 Shore A	-20°C / +200°C
B4	B	PTFE + 40% Bronze	Dark brown		K6	NBR 70 Shore A	-30°C / +100°C
B4	B	PTFE + 40% Bronze	Dark brown		G6	FKM 70 Shore A	-20°C / +200°C

Other qualities of materials are available depending on your particularities.

Conditions for use

4.EN_Courbe_temperature

Shaft design

Shaft material

Suitable materials are:

Common steels in mechanical construction type C35 and C45
Stainless steels type 1.4300 and 1.4112 for watertightness
Aluminum
Cast iron
Plastic materials

Shaft hardness

The hardness of the shaft will depend on the linear speed (in m/s) and the level of the environment.

HRC Hardness	Rotation speed
Environement	v ≤ 2,5 m/s	v ≤ 5,0 m/s	v ≤ 10,0 m/s	v ≤ 15,0 m/s
Lubricated	35	40	52	58
Dry	40	52	58	60
Water	40	40	40	40
Abrasive	58	62	62	62

Surface conditions

The surface quality of the tree must take into account the recommendations below.

Standard conditions:

Ra = 0.2 to 0.4 µm and 0.1 µm for rigorous applications
Rz = 1.0 to 3.0 µm

Shaft tolerance

The shaft must be of tolerance h11 according to ISO 286-2

Shaft diameter Ød1 (mm)	Tolerance h11 (mm)
Ød1 ≤ 3,0	-0,060 / 0
3,0 < Ød1 ≤ 6,0	-0,075 / 0
6,0 < Ød1 ≤ 10,0	-0,090 / 0
10,0 < Ød1 ≤ 18,0	-0,110 / 0
18,0 < Ød1 ≤ 30,0	-0,130 / 0
30,0 < Ød1 ≤ 50,0	-0,160 / 0
50,0 < Ød1 ≤ 80,0	-0,190 / 0
80,0 < Ød1 ≤ 120,0	-0,220 / 0
120,0 < Ød1 ≤ 180,0	-0,250 / 0
180,0 < Ød1 ≤ 250,0	-0,290 / 0
250,0 < Ød1 ≤ 315,0	-0,320 / 0
315,0 < Ød1 ≤ 400,0	-0,360 / 0
400,0 < Ød1 ≤ 500,0	-0,400 / 0

Chamfer and Radius

To avoid altering the primary lip of the sealing ring during assembly, it is strongly recommended to provide a chamfer on the shaft. Please refer to the table below

Shaft diameter Ød1 (mm)	Chamfer diameter Ød3 (mm)	Radius R (mm)
Ød1 ≤ 10,0	Ød1 - 1,50	2,00
10,0 < Ød1 ≤ 20,0	Ød1 - 2,00	2,00
20,0 < Ød1 ≤ 30,0	Ød1 - 2,50	3,00
30,0 < Ød1 ≤ 40,0	Ød1 - 3,00	3,00
40,0 < Ød1 ≤ 50,0	Ød1 - 3,50	4,00
50,0 < Ød1 ≤ 70,0	Ød1 - 4,00	4,00
70,0 < Ød1 ≤ 95,0	Ød1 - 4,50	5,00
95,0 < Ød1 ≤ 130,0	Ød1 - 5,50	6,00
130,0 < Ød1 ≤ 240,0	Ød1 - 7,00	8,00
240,0 < Ød1 ≤ 500,0	Ød1 - 11,00	12,00

Shaft runout

Shaft runout corresponds to a deviation between the real axis of the shaft and the theoretical axis of rotation. It is important to reduce shaft runout as much as possible by positioning the seal ring as close as possible to the bearing. The table below describes the maximum permissible values depending on the rotation speed and the material of the sealing lip.

Shaft run-out for shaft seals with spring

Eccentricity

The shaft and housing must be mounted centered in relation to each other to eliminate any one-sided radial loading at the sealing lip of the ring. This joint can tolerate 0.05 to 0.15 mm of coaxiality defect depending on the diameter of the shaft.

Housing design

Schema implantation BECA 86N

Surface conditions

The surface quality of the accommodation must take into account the recommendations below.

Standard conditions for elastomer coated bushings:

Ra = 0.8 µm
Rz = 1.6 µm

Housing bore diameter tolerance

The housing bore diameter must be tolerance H8 according to ISO 286-2

Bore diameter ØD1 (mm)	Tolerance H8 (mm)
3,0 < ØD1 ≤ 6,0	0 / +0,018
6,0 < ØD1 ≤ 10,0	0 / +0,022
10,0 < ØD1 ≤ 18,0	0 / +0,027
18,0 < ØD1 ≤ 30,0	0 / +0,033
30,0 < ØD1 ≤ 50,0	0 / +0,039
50,0 < ØD1 ≤ 80,0	0 / +0,046
80,0 < ØD1 ≤ 120,0	0 / +0,054
120,0 < ØD1 ≤ 180,0	0 / +0,063
180,0 < ØD1 ≤ 250,0	0 / +0,072
250,0 < ØD1 ≤ 315,0	0 / +0,081
315,0 < ØD1 ≤ 400,0	0 / +0,089
400,0 < ØD1 ≤ 500,0	0 / +0,097
500,0 < ØD1 ≤ 630,0	0 / +0,110

Housing width dimensions

The table below provides information on the recommended groove width and radius.

Height H1	Width		Radius R2 max
Height H1	L2min (H1x0,85)	L1min (H1+0,25)	Radius R2 max
7,00	6,15	7,25	0,30
8,00	7,00	8,25
10,00	8,70	10,25
12,00	10,40	12,25	0,50
15,00	12,95	15,25
20,00	17,20	20,25

Radial extrusion set dimensions

When operating under pressure, and in order to prevent the seal from extruding, the seal should be held in its groove with a stop dimensioned such that the radial extrusion clearance does not exceed 0.30 mm maximum.

Assembly recommendations

Several essential rules must be respected before proceeding with the assembly of the joints:

Check that the mechanical parts (shaft and housing) have an entry chamfer
Deburr and chamfer or round off sharp edges, cover threaded parts
Remove machining chips and any impurities and other foreign particles
Thoroughly clean all mechanical parts
When using assembly tools, check that they are clean and free of sharp edges

Assembly diagram BECA 86N

Only on request