QC/T 597.3-2019Specifications for threaded fasteners with pre-applied adhesive coatings - Part 3: Sealing coatings (English PDF)
螺纹紧固件预涂粘附层技术条件 第3部分 密封涂层
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
August 2, 2019
Implementation date
January 1, 2020
Scope
QC/T 597.3-2019 is the English-translated version of 螺纹紧固件预涂粘附层技术条件 第3部分 密封涂层.
QC/T 597.3-2019 covers the requirements, test methods, inspection rules and storage for non-reusable sealing coatings pre-applied to external thread fasteners, meaning bolts, screws and studs, so that the assembled thread pair does not leak, and it applies to threaded connection pairs conforming to GB/T 196, GB/T 197 or GB/T 12716.
It replaces QC/T 597-1999.
The requirements ask for no leakage at room temperature once the coated bolt is fully screwed in and exposed to engine coolant, compressed air or water; aging resistance against engine oil, against gasoline or diesel fuel and against gearbox oil; heat resistance after five hours at 150 degrees C and cold resistance after five hours at minus 30 degrees C, after which the room temperature and aging requirements must still be met; and resistance to cold and heat shock.
It also fixes where the sealant goes: over a thread length equal to the thread diameter plus or minus one pitch, applied all round at 360 degrees, never less than three full pitches, and normally clear of the last two full threads at the bolt end.
The tests use steel pressure vessels: 1 MPa held for one minute for coolant, compressed air and water, read under ultraviolet light with a fluorescent tracer or with soap solution for air; and 0.4 MPa held for five hours at 150 plus or minus 2 degrees C for engine oil to GB 11121 and at 70 plus or minus 2 degrees C for fuel to GB 17930 or GB 19147.
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Document preview — QC/T 597.3-2019
National Standard of the People's Republic of China
- Replacing
- QC/T 597-1999
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- Foreword3
- 1 Scope4
- 2 Normative references4
- 3 Requirements4
- 4 Test method6
- 5 Inspection rules8
- 6 Storage8
1 Scope
1.1 This Part specifies the requirements, test methods, inspection rules, storage of non-reusable sealing coating (hereinafter referred to as "sealant"), which is pre-applied onto the external thread fasteners (bolt, screw and stud, hereinafter referred to as "bolt"), for the purpose of preventing leakage AND having the sealing function.
1.2 This Part is applicable to the sealing of threaded connection pair, in accordance with GB/T 196, GB/T 197 or GB/T 12716.
2 Normative references
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard.
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 197 General purpose metric screw threads - Tolerances
GB 11121 Gasoline engine oil
GB/T 12716 Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads
GB 17930 Gasoline for motor vehicles
GB 19147 Automobile diesel fuels
GB 29743 Motor vehicle engine coolant
3 Requirements
3.1 Sealing at room temperature
3.1.1 After the bolts coated with sealant are fully screwed into the screw holes AND then come into contact with the coolant, it shall ensure that the thread pair does not leak. The test method shall be in accordance with the provisions in 4.2.1.
3.1.2 The bolts coated with sealant are fully screwed into the screw holes; the thread pair shall not leak, after the compressed air is introduced. The test method shall be according to the provisions of 4.2.2.
3.1.3 The bolts coated with sealant are fully screwed into the screw holes; the threaded pairs shall not leak, after being filled with water. The test method shall be in accordance with the provisions in 4.2.3.
3.2 Aging resistance
3.2.1 The bolts coated with sealant are fully screwed into the screw holes AND then come into contact with the engine oil; it shall ensure that the thread pair does not leak. The test method shall be in accordance with the provisions in 4.3.1.
3.2.2 After the bolts coated with sealant are fully screwed into the screw holes AND then come into contact with fuel (gasoline or diesel), it shall be ensured that the thread pair does not leak. The test method shall be in accordance with the provisions in 4.3.2.
3.2.3 The bolts coated with sealant are fully screwed into the screw holes AND then contact with the gearbox oil, it shall ensure that the thread pair does not leak. The test method shall be in accordance with the provisions in 4.3.3.
3.3 Heat resistance
After the bolts coated with sealant are fully screwed into the screw holes, place them at 150 °C for 5 hours; then place them at room temperature, which shall meet the requirements of 3.1 and 3.2, respectively.
3.4 Cold resistance
After the bolts coated with sealant are fully screwed into the screw holes, place them at -30 °C for 5 hours; then place them at room temperature, which shall meet the requirements of 3.1 and 3.2, respectively.
3.5 Resistance to cold and heat shock
After the bolts coated with sealant are fully screwed together with the screw holes, they shall be resistant to cold and heat shocks. The test method shall be according to the provisions of 4.4.
3.6 Bolt pre-painted parts and length
Apply the sealant to the bolt threads, for a length equal to the thread diameter ± 1 pitch. Unless otherwise specified, avoid coating within 2 full threads of the bolt end. In order to fully ensure the sealing performance, the sealant coating length shall not be less than 3 full pitches. The sealant is applied at an angle of 360° (sealant is applied all around).
4 Test method
4.1.2.3 The bolts shall not produce clamping force, after they are screwed together.
4.1.2.4 When the bolts are screwed into the screw holes on the pressure vessel, the sealant shall be fully engaged with the screw holes.
4.2 Leakage test under room temperature, different test media and working conditions
4.2.1 Coolant
Use the liquid, which is fully mixed by 40% water, fluorescent agent, cooling liquid in accordance with GB 29743, as the test medium. Screw the bolts, which are coated with sealant, into the screw holes of the 1 MPa steel pressure vessel. Keep the pressure for 1 min. Observe under ultraviolet light. The thread pair shall have no leaks.
4.2.2 Compressed air
Use compressed air as the test medium. Apply soap solution to the screwed part of the bolt. Keep the pressure in the screw hole of the 1 MPa steel container, for 1 min. The thread pair shall not have any leakage.
4.2.3 Water
For bolts coated with sealant, use water as the test medium. Keep the pressure in a steel pressure vessel of 1 MPa, for 1 min. There shall be no leakage in the thread pair.
4.3 Aging resistance test under different test media and working conditions
4.3.1 Engine oil
Use the liquid, which is fully mixed by the engine oil that complies with the provisions of GB 11121 AND fluorescent agent, as the test medium. Screw the sealant-coated bolts into the screw holes of the steel pressure vessel, which has a pressure of 0.4 MPa. Hold the pressure, under the environmental conditions of (150 ± 2) °C, for 5 h. Observe it under ultraviolet light. The thread pair shall not show any leakage.
4.3.2 Fuel (gasoline or diesel)
Use the liquid, which is fully mixed with the gasoline for vehicles specified in GB 17930 or diesel oil for vehicles specified in GB 19147, fluorescent agent, as the test medium. Screw the bolts coated with sealant into the screw holes of the 0.4 MPa steel pressure vessel. Hold the pressure at (70 ± 2) °C for 5 hours. When viewed under ultraviolet light, there shall be no leakage from the threaded pair.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 196General purpose metric screw threads - Basic dimensions
- GB/T 197General purpose metric screw threads -- Tolerances
- GB 11121Gasoline engine oils
- GB/T 12716Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads
- GB 17930Gasoline for motor vehicles
- GB 19147Automobile diesel fuels
GB 29743
Similar standards
Editions of QC/T 597.3
| Edition | Title | Revision | Status |
|---|---|---|---|
| QC/T 597.3-2019 | Specifications for threaded fasteners with pre-applied adhesive coatings - Part 3: Sealing coatings | current edition | Current |
| QC/T 597-1999 | Specifications for threaded fasteners with pre-applied adhesive coatings - Part 3: Sealing coatings | previous edition | Superseded |
This page sells the current edition, QC/T 597.3-2019. Earlier editions are listed for reference only.
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Related Standards
GB 11121-2025 — Gasoline engine oils
GB 17930-2016 — Gasoline for motor vehicles
GB 19147-2016 — Automobile diesel fuels
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QC/T 597.3-2019
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