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JB/T 8727-2004 (JBT 8727-2004)

Chinese Standard: 'JB/T 8727-2004'
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Standard ID JB/T 8727-2004 (JB/T8727-2004)
Description (Translated English) Hydraulic fluid power - Hose assemblies
Sector / Industry Mechanical & Machinery Industry Standard (Recommended)
Classification of Chinese Standard J20
Classification of International Standard 23.100.30
Word Count Estimation 18,141
Date of Issue 2004-10-20
Date of Implementation 2005-04-01
Older Standard (superseded by this standard) JB/T 8727-1998; JB/T 8885-1999
Quoted Standard GB/T 3; GB/T 196; GB/T 197; GB/T 699; GB/T 1184-1996; GB/T 1804-2000; GB/T 2828.1; GB/T 3103.1; GB/T 3683; GB/T 7935; GB/T 7939; GB/T 9576; GB/T 9577; GB/T 10544; GB/T 17446; JB/T 7858; ISO 6162-1994; ISO 8434-4-1995
Drafting Organization Tianjin Institute of Mechanical Engineering
Administrative Organization Hydraulic and pneumatic National Standardization Technical Committee
Regulation (derived from) Development and Reform Bulletin (04/61)
Summary This standard specifies nominal inside diameter was 5mm ~ 31. 5mm flared, 5mm ~ 38mm card sets, 5mm ~ 51mm welding (or quick), flange, 24 �� cone sealed steel reinforced hydraulic rubber hose assembly (hereinafter referred to as steel wire braided hydraulic hose assemblies), wire reinforced rubber cover hydraulic rubber hose assembly (hereinafter referred to as wire spiral hydraulic hose assemblies) product classification, the basic parameters of the connection size, performance, technical requirements, test methods, inspection rules, marking, packaging, storage, transportation. This standard applies to with hydraulic oil (liquid) as the working medium, operating temperature ranges of -40 �� ~ +100 �� wire braided hydraulic hose assemblies, 1-5 type wire spiral hydraulic hose assembly, -10 �� ~ +121 �� 6 type wire spiral hydraulic hose assemblies.

ICS 23.100.30
J 20
Replacing JB/T 8727-1998, JB/T 8885-1999
Hydraulic fluid power – Hose assemblies
液压软管 总成
Issued by. National Development and Reform Commission of the PRC
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 6 
4 Product classification ... 7 
5 Usability ... 12 
6 Technical conditions ... 14 
7 Test items and test methods ... 16 
8 Inspection items and inspection methods of assembly and appearance ... 17 
9 Inspection rules ... 17 
10 Marking, packaging, transportation, and storage ... 20 
11 Annotation notes (reference this Standard) ... 20 
Annex A... 21 
Annex B... 22 
Annex C... 23 
This Standard is a revision of JB/T 8727-1998 Hydraulic Fluid Power – Hose
Assemblies. During the revision, the contents of JB/T 8885-1999 Technical Conditions
for Hose Assemblies of Hydraulic Fluid Power has been integrated into this Standard.
Compared with the previous edition, this Standard has the following changes.
- ADJUST S16, S18, S21, and S 24 in Table 1 of original JB/T 8727 standard into
S14, S17, S19, and S22 respectively; ADJUST S16, S18, S21, S24, and S41 in
Table 3 into S14, S17, S19, S22, and S36 respectively. ADJUST the L dimension
in Figure 1 ~ 3 of the original standard.
- Compared with the original JB/T 8885 standard, this Standard proposes the
tolerance requirements for the hose assemblies’ flexural core.
- ADJUST the tensile strength of the connector materials of the hose assemblies to
meet the requirements of swaging assembly and reliability of the hose
assemblies. ADJUST the low-temperature bending test item in the Test Items and
Test Methods into “Test can be conducted as required by the users, otherwise,
there is no need to conduct the test”.
- The newly-added flange hose assemblies and 24° cone sealing hose assemblies
adopt the connector type specified in international standard ISO 6162.1994 and
ISO 8434.4.1995.
- Annex A of this Standard specifies the size of mandrel or steel ball of the steel
wire braided hose and steel wire wound hose respectively.
This Standard replaces and abolishes JB/T 8727-1998 and JB/T 8885-1999.
Annex A, Annex B, and Annex C of this Standard are normative.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of the National Technical Committee for
Standardization of Hydraulics & Pneumatics (SAC/TC3).
Main drafting organizations of this Standard. Tianjin Research Institute of Construction
Machinery, Ningbo Yonghua Hydraulic Equipment Co., Ltd., and Ansteel Hydraulic
Accessory Factory.
Main drafters of this Standard. Feng Guoxun, Zhou Shunhua, and Liu Xiaoping.
The previous editions replaced by this Standard are as follows.
- JB/T 8727-1998;
Hydraulic fluid power – Hose assemblies
1 Scope
This Standard specifies the product classification, basic parameters, connection
dimension, usability, technical conditions, test methods, inspection rules, marking,
packaging, storage, transportation, etc. of flared (nominal inner-diameter of
5mm~31.5mm), ferrule (nominal inner-diameter of 5mm~38mm), welding (or
quick-change, nominal inner-diameter of 5mm~51mm), flange, and 24° cone sealing
steel wire reinforced hydraulic rubber hose assemblies (hereinafter referred to as
“steel-wire-braided hydraulic hose assemblies”) and steel-wire-wound reinforced
hydraulic rubber hose assemblies (hereinafter referred to as “steel-wire-wound
hydraulic hose assemblies”).
This Standard applies to the steel-wire-braided hydraulic hose assemblies (working
temperature range of -40°C ~ +100°C), Type 1 ~ 5 steel-wire-wound hydraulic hose
assemblies (working temperature range of -40°C ~ +100°C), and Type 6
steel-wire-wound hydraulic hose assemblies (working temperature range of -10°C ~
+121°C) with hydraulic oil (fluid) as the working medium.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB/T 3 Run-outs, undercuts and chamfers for general purpose metric screw
threads (GB/T 3-1997, eqv ISO 3508.1976, ISO 4755.1983)
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 197 General purpose metric screw threads - Tolerances
GB/T 699 Quality carbon structural steels
GB/T 1184-1996 Geometrical tolerancing - Geometrical tolerances for features
without individual tolerance indications (eqv ISO 2768-2.1989)
GB/T 1804-2000 General tolerances - Tolerances for linear and angular
dimensions without individual tolerance indications (eqv ISO 2768-1.1989)
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1. Sampling
schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 3103.1 Tolerances for fasteners - Bolts, screws, studs and nuts (GB/T
3103.1-2002, ISO 4759-1.2000, IDT)
GB/T 3683 Rubber hoses and hose assemblies - Wire-braid-reinforced hydraulic
types for oil-based or water-based fluids - Specification
GB/T 7935 Hydraulic fluid power - General requirements for hydraulic components
GB/T 7939 Hydraulic fluid power - Hose assemblies - Test methods (GB/T
7939-1987, neq ISO 6605.1986)
GB/T 9576 Rubber and plastics hoses and hose assemblies - Guide to selection,
storage, use and maintenance (GB/T 9576-2001, idt ISO 8331.1991)
GB/T 9577 Rubber and plastics hoses and hose assemblies - Rules for marking,
package and transportation
GB/T 10544 Rubber hoses and hose assemblies - Rubber-covered, spiral wire
reinforced, hydraulic type
GB/T 17446 Fluid power systems and components - Vocabulary
JB/T 7858 Method to determine cleanliness and acceptance criterions for hydraulic
ISO 6162.1994 Hydraulic fluid power - Four-screw split-flange connections for use
at pressures of 2.5 MPa to 40 MPa (25 bar to 400 bar) - Type I metric series and
type II inch series
ISO 8434-4.1995 Metallic tube connections for fluid power and general use - Part 4.
24 degree cone connectors with O-ring weld-on nipples
3 Terms and definitions
The following terms and definitions AND those defined in GB/T 17446 apply to this
3.1 Maximum working pressure
The maximum working pressure of the hydraulic hose assemblies that ensures the
system’s normal operation under specified operational conditions.
3.2 Change length
The amount of axial length change of the hydraulic hose assemblies under the
10 7.5 12 16.0 28.0 31.0 38.0 51.5 69.0 27.6 M18×l. 5 2.5 22
12.5 10 15 14.0 25.0 27.5 34.5 43.0 51.5 55.0 27.6 M22×l. 5 2.5 27
16 13 18 10.5 20.0 22.5 27.5 38.0 48.0 — — M27×l. 5 2.5 32
19 15 22 9.0 16.0 20.5 34.5 34.5 43.0 42.0 27.6 M30×2 4 36
25 21 28 7.0 14.0 20.5 27.5 27.5 34.5 38.0 27.6 M36×2 4 41
31.5 27.0 35 4.4 11.0 17.0 — 20.5 24.0 32.5 20.7 M45×2 4 50
38 33 42 3.5 9.0 14.0 — 17.0 20.5 29.0 17.2 M52×2 4 60
Table 5 Basic parameters and connection dimension of 24° cone sealing
hydraulic hose assemblies (continued)
Max working
pressure of
hose assemblies
Max working pressure of steel-wire-wound hose
Related standard: JB/T 8727-2017    JB/T 8729-2013
Related PDF sample: GB/T 3766-2015    GB/T 14039-2002