This standard specifies the groove dimensions and tolerances of pneumatic O-rings (hereinafter referred to as O-rings) with working pressure not exceeding 1.6 MPa. JB/T 6658-1993 Pneumatic O-rings Groove Dimensions and Tolerances JB/T6658-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 6658-1993
Pneumatic O-rings
Groove dimensions and tolerances
Published on 1993-05-07
Standards Download Network of the Ministry of Machinery and Electronics Industry of the People's Republic of China (www.bzxzw.com)
Implemented on 1994-01-01
Mechanical Industry Standard of the People's Republic of China
Pneumatic O-rings
Groove dimensions and tolerances
Subject content and scope of application
JB/T 6658-1993
This standard specifies the groove dimensions and tolerances of pneumatic O-rings (hereinafter referred to as O-rings) with a working pressure not exceeding 1.6MPa.
This standard applies to O-rings specified in JB/T6659. The hardness of the synthetic rubber material used in O-rings is 70 ± 5IRHD). Note: 1) IRHD is the international rubber hardness scale. Reference standard
JB/T6659
: Letter code
O-ring rubber seals for hydraulic and pneumatic use
Groove dimensions and design calculations
Dimension series and tolerances of O-ring rubber seals for pneumatic use This standard uses the following letter codes:
Inner diameter of O-ring;
Cross section diameter of O-ring;
Groove bottom diameter when piston sealing;
Inner diameter of cylinder;
Piston rod diameter;
Piston rod sealing The bottom diameter of the groove; the outer diameter of the groove when axially sealing (under internal pressure); the inner diameter of the groove when axially sealing (under external pressure); the piston diameter (piston seal);
the diameter of the piston rod matching hole (piston rod seal); the width of the O-ring groove (without retaining ring);
the depth of the O-ring groove when axially sealing;
the depth of the O-ring groove when radially sealing;
the length of the chamfer;
the radius of the groove bottom fillet;
the radius of the groove edge fillet;
the radial clearance on one side.
the groove type of O-ring
according to the compression direction of the O-ring, it is divided into radial sealing and axial sealing. 4.1
Radial seal
1993-05-07 Approved by the Ministry of Machinery Industry of the People's Republic of China Standard Download Network (www.bzxzw.com)
1994-01-01 Implementation
Piston seal groove
Piston seal groove type shall comply with the provisions of Figure 1 15*20
4.1.2 Piston rod seal groove
Piston rod seal groove type shall comply with the provisions of Figure 2. 4.2 Axial seal
4.2.1 Grooves subject to internal pressure
JB/T 66581993
Grooves subject to internal pressure shall comply with the provisions of Figure 3. e
4.2.2 Grooves subject to external pressure
JB/T6658-1993
The groove type subject to external pressure shall comply with the provisions of Figure 4. dt
50-ring groove dimensions and tolerances
5.1 Radial seal
5.1.1 The groove dimensions of radial seal (see Figures 1 and 2) shall comply with the provisions of Table 1. Table 1
O-ring cross-sectional diameter d
Groove width b
Piston seal
Groove depth!
(for calculation of d,)
Piston rod sealwwW.bzxz.Net
(for calculation of d)
Minimum lead angle length 2mi
Groove bottom fillet radius
Groove edge corner radius
Dynamic seal
Static seal
Dynamic seal
Static seal
5.1.2 Calculation of radial seal groove bottom diameter d. and ds (dynamic seal and static seal) 5.1.2.1 Piston seal groove (see Figure 1) Calculate the maximum value of d according to formula (1):
dimus = d4min - 2t
Where: d3max
d, basic dimension plus deviation, mm;
d4mind basic dimension plus lower deviation, mm. 5.1.2.2 The minimum diameter of the piston rod seal groove (see Figure 2) is calculated according to formula (2):
domin = dsmas + 2t
Wherein: dmin
d. basic size plus lower deviation, mm;
ds basic size plus deviation, mm.
5.2 Axial seal
JB/T 66581993
The groove dimensions of the axial seal (see Figures 3 and 4) shall comply with the provisions of Table 2. Table 2
O-ring cross-sectional diameter d
Groove width b
Groove depth
Groove corner fillet radius
Groove fillet radius
5.2.2 Calculation of axial seal groove outer diameter d, and groove inner diameter dg (see Figures 3 and 4) The basic dimension of the groove outer diameter d under internal pressure is calculated according to formula (3): 1.80
d (basic dimension) = d, (basic dimension) + 2d (basic dimension) The basic dimension of the groove outer diameter d under external pressure is calculated according to formula (4): ds (basic dimension) = d, (basic dimension) Groove size tolerance
The groove size tolerance shall comply with the provisions of Table 3. Table 3
Q-ring cross-sectional diameter d
Groove size
Cylinder inner diameter d
Groove bottom diameter
(Piston seal) d
Piston diameter d
Piston rod diameter d
Groove bottom diameter
(Piston rod seal) d
Piston rod matching hole diameter d
Groove outer diameter for axial sealing d
Groove inner diameter for axial sealing d
O-ring Ring groove width b
Axial sealing groove depth h
5.4 Groove coaxiality tolerance
Dynamic seal
Static seal
Dynamic seal
Static seal
The coaxiality tolerance between diameters dio and de, d and d, shall meet the following requirements: 1.50
For diameters not greater than 50mm, it shall not be greater than 0.025mm; for diameters greater than 50mm, it shall not be greater than 0.050mm. 5.5 Surface roughness
The surface roughness of the groove and its mating parts shall comply with the provisions of Table 4. 4
Bottom and side of groove
Mating surface
Application
Static seal
Dynamic seal
Static seal
Dynamic seal
Angle surface
JB/T66581993
Pressure condition
No alternation, no pulse
Alternation or pulse
No alternation, no pulse
Alternation or pulse
Note: The values ​​in brackets are for applications requiring higher precision. Selection of O-ring specifications for application range
3.2 (1.6)
1.6 (0.8)
1.6 (0.8)
When several O-ring cross-sections can be selected, O-rings with larger cross-sections should be selected first. Surface roughness
Table 5 lists the application range of O-rings selected according to JB/T6659 for radial static seals and dynamic seals. Table 5
O-ring specifications
3.75~4.50
5.00-13.2
14.0~50.0
7.10~22.4
Note: ""
is the recommended seal type.
Additional instructions:
Dynamic seal
Piston seal
Static seal
This standard is proposed and managed by the Pneumatic Technical Committee of the National Hydraulic and Pneumatic Standardization Committee. This standard is drafted by Wuxi Pneumatic Technology Research Institute and Wuxi Pneumatic Components General Factory. The main drafters of this standard are Gao Linlin and Lu Juan. Use
12.5 (6.3)
6.3 (3.2)
6.3 (3.2)
Piston rod seal
Dynamic seal
Static seal
People's Republic of China
Mechanical Industry Standard
Pneumatic O-ring
Groove dimensions and tolerances
JB/T66581993
Published by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing
Postal Code 100044)
Sheet 1/2
Format 880×1230
Number of words 10,000
First edition in January 1994
First printing in January 1994
Print run 1-500
Price 5.00 yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661_8599
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