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GB/T 2878.1-2025: Connections for hydraulic fluid power - Ports with truncated housing and stud ends with metric threads - Part 1: Ports with truncated housing
Status: Valid GB/T 2878.1: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 2878.1-2025 | English | 194 |
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Connections for hydraulic fluid power - Ports with truncated housing and stud ends with metric threads - Part 1: Ports with truncated housing
| Valid |
GB/T 2878.1-2025
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| GB/T 2878.1-2011 | English | 214 |
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Connections for hydraulic fluid power -- Ports and stud ends with metric threads and O-ring sealing -- Part 1: Ports
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GB/T 2878.1-2011
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| GB/T 2878-1993 | English | 239 |
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Fluid power systems and components Ports. Ports. Dimensions and design
| Obsolete |
GB/T 2878-1993
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PDF similar to GB/T 2878.1-2025
Basic data | Standard ID | GB/T 2878.1-2025 (GB/T2878.1-2025) | | Description (Translated English) | Connections for hydraulic fluid power - Ports with truncated housing and stud ends with metric threads - Part 1: Ports with truncated housing | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J20 | | Classification of International Standard | 23.100.40 | | Word Count Estimation | 10,114 | | Date of Issue | 2025-03-28 | | Date of Implementation | 3/28/2025 | | Older Standard (superseded by this standard) | GB/T 2878.1-2011 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 2878.1-2025: Connections for hydraulic fluid power - Ports with truncated housing and stud ends with metric threads - Part 1: Ports with truncated housing
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 23.100.40
CCSJ20
National Standard of the People's Republic of China
Replaces GB/T 2878.1-2011
Hydraulic transmission connection ordinary threaded bevel oil port and stud end
Part 1.Oblique oil ports
Released on 2025-03-28
2025-03-28 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is part 1 of GB/T 2878 "Hydraulic transmission connection ordinary threaded oil port and stud end". GB/T 2878 has been
The following parts were published.
--- Part 1.Oblique oil port;
--- Part 2.Heavy duty stud ends (S series);
--- Part 3.Lightweight stud ends (L series);
--- Part 4.Hexagonal screw plugs.
This document replaces GB/T 2878.1-2011 "Hydraulic transmission connections with metric threads and O-ring seals, oil ports and stud ends"
Part 1.Oil ports. Compared with GB/T 2878.1-2011, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
--- The L1 dimension of thread specifications "M8×1" and "M10×1" is changed from "1.6" to "2.2" (see Table 1, Table 1 of the.2011 edition);
--- Added the requirement that "the user of this document should ensure that the material around the oil port is sufficient to withstand the maximum working pressure" (see Chapter 4);
--- Added interchangeability warning (see Chapter 5);
--- Changed the naming method of oil ports (see Chapter 7, Chapter 6 of the.2011 edition);
--- Changed the identification method (see Chapter 8, Chapter 7 of the.2011 edition).
This document is equivalent to ISO 6149-1.2022 "Pipe fittings for hydraulic power and general purposes with ISO 261 metric threads and
O-ring sealed oil ports and stud ends Part 1.Oil ports with countersunk grooves for O-ring sealing.
The following minimal editorial changes were made to this document.
--- In order to coordinate with the existing standards, the standard name is changed to "Hydraulic transmission connection ordinary threaded oil port and stud end part 1.
Inclined oil port".
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Hydraulic and Pneumatic Standardization Technical Committee (SAC/TC3).
This document was drafted by. Zhejiang Haigewei Hydraulic Technology Co., Ltd., Beijing Tianma Intelligent Control Technology Co., Ltd., Tongling University, Zhejiang
Haihong Hydraulic Technology Co., Ltd., Beijing Machinery Industry Automation Research Institute Co., Ltd.
The main drafters of this document. Wang Yongchao, Li Mingzhong, Wang Dongsheng, Wang Xinhui, Gao Jingcheng and Cao Qiaohui.
This document was first published in.1993 as GB/T 2878-1993; it was first revised in.2011 and published in parts.
GB/T 2878.1-2011 "Hydraulic transmission connections with metric threads and O-ring seals, oil ports and stud ends - Part 1.Oil ports";
This is the second revision.
Introduction
In a hydraulic transmission system, power is transmitted and controlled by a pressurized fluid in a closed circuit. In general applications, the fluid can be
The oil is delivered under pressure. The threaded oil port of the component is connected to the hard pipe or hose through a pipe joint or hose joint. The oil can be sealed by screwing in the screw plug.
The oil port is an integral part of the hydraulic transmission components (pumps, motors, valves, cylinders, etc.).
GB/T 2878 aims to determine the dimensions and performance requirements of common threaded oblique oil ports and stud ends, and is intended to consist of four parts.
--- Part 1.Oblique oil ports. The purpose is to determine the size and performance requirements of common thread oblique oil ports.
--- Part 2.Heavy stud ends (S series). The purpose is to determine the dimensions and properties of normal threaded heavy stud ends (S series)
Require.
--- Part 3.Lightweight stud ends (L series). The purpose is to determine the dimensions and properties of ordinary threaded lightweight stud ends (L series)
Require.
--- Part 4.Hexagonal screw plugs. The purpose is to determine the dimensions and performance requirements of hexagonal screw plugs with normal threads.
Hydraulic transmission connection ordinary threaded bevel oil port and stud end
Part 1.Oblique oil ports
1 Scope
This document specifies the dimensions and requirements for common threaded bevel ports for hydraulic transmission connections and is applicable to ISO 6149-2 and ISO 6149-3.
Stud end connection as specified in.
The oil ports specified in this document are applicable to the maximum working pressure of 63MPa for the non-adjustable stud end and the maximum working pressure of 63MPa for the adjustable stud end.
The maximum working pressure is 40MPa. The allowable working pressure is determined by factors such as oil port size, material, structure, working conditions and application. Pressure level
See ISO 6149-2 and ISO 6149-3.
Note. It is recommended that the oil ports given in this document be used for newly designed hydraulic systems.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
Note. GB/T 193-2003 Common thread diameter and pitch series (ISO 261.1998, MOD)
ISO 965-1 ISO general purpose metric thread tolerances Part 1.Principles and basic data
Note. GB/T 197-2018 General thread tolerances (ISO 965-1.2013, MOD)
Note. GB/T 20330-2006 Diameter of twist drill for drilling before tapping (ISO 2306.1972, MOD)
Note. GB/T 17446-2024 Fluid power systems and components vocabulary (ISO 5598.2020, MOD)
ISO 6149-2 Pipe fittings for hydraulic power and general purposes - Oil ports and threaded connections with ISO 261 metric threads and O-ring seals
Note. GB/T 2878.2-2011 Hydraulic transmission connections with metric threads and O-ring seals, oil ports and stud ends Part 2.Heavy duty stud ends
(S series) (ISO 6149-2.2006, MOD)
ISO 6149-3 Pipe fittings for hydraulic power and general purposes - Oil ports and threaded connections with ISO 261 metric threads and O-ring seals
Note. GB/T 2878.3-2017 Hydraulic transmission connections with metric threads and O-ring seals, oil ports and stud ends Part 3.Light stud ends (L
Series) (ISO 6149-3.2006, MOD)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5598 apply.
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