QC/T 619-2023 PDF English
US$170.00 · In stock · Download in 9 secondsQC/T 619-2023: Hose clamp worm with drive B type and C type Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid QC/T 619: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| QC/T 619-2023 | English | 170 |
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Hose clamp worm with drive B type and C type
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| QC/T 619-1999 | English | 239 |
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Type B and C Worm Drive Type Hose Hoop
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: QC/T 619-2023
QC/T 619-2023: Hose clamp worm with drive B type and C type---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/QCT619-2023
QC
AUTOMOTIVE INDUSTRY STANDARD
ICS 43.040
CCS T 33
Replacing QC/T 619-1999
Clamps with Worm Gear Driver Type B and Type C
Issued on. DECEMBER 20, 2023
Implemented on. JULY 1, 2024
Issued by. Ministry of Industry and Information Technology of the People’s
Republic of China
Table of Contents
Foreword... 7
1 Scope... 8
2 Normative References... 8
3 Terms and Definitions... 9
4 Type and Size... 9
5 Technical Conditions... 11
6 Test Methods... 11
7 Product Number... 14
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This Document replaced QC/T 619-1999 Type B and C Worm Drive Type Hose Hoop.
Compared with QC/T 619-1999, the major technical changes of this Document are as follows
besides the editorial modifications.
--- Add product applicable systems specified in this Document (see Clause 1 of this Edition);
--- Modify the groove type of the worm head, changing the slot type into the cross type (see
Figures 1 and 2 of this Edition);
--- Add stainless-steel materials for worms (see Table 3 of this Edition);
--- Modify coating requirements (see Table 3 of this Edition);
--- Add corrosion resistance time according to materials and surface treatment (see Table 3
of this Edition);
--- Add requirements for prohibited substances for automobiles (see Table 3 of this Edition).
This Document was proposed by and under the jurisdiction of National Technical Committee
of Auto Standardization (SAC/TC 114).
Drafting organizations of this Document. Zhejiang Jieneng Auto Parts Co., Ltd.; CEMT Co.,
Ltd.; Zhejiang University; Ningbo Changle Hose Clamps Co., Ltd.; BAIC Group Off-Road
Vehicle Co., Ltd.; China First Automobile Co., Ltd. R&D Institute; Faw Jiefang Automotive
Company; Chery Automobile Co., Ltd.; and Yuyao Hengwei Hose Clamp Co., Ltd.
Chief drafting staffs of this Document. Guo Fushun, Xu Zhen, Zhou Jing, Zhang Ze, Luan
Jianxin, Yang Chaoyang, Sun Chao, Dai Mengjie, and Zhang Qifeng.
The historical editions replaced by this Document are as follows.
--- QC/T 619-1999 was first-time published in 1999;
--- It is first-time revised hereby.
Clamps with Worm Gear Driver Type B and Type C
1 Scope
This Document specifies the type, size, technical conditions and test methods of clamps with
worm gear driver Type B and Type C (hereinafter referred to as "clamp") for automobiles.
This Document is applicable to the clamps for connecting and sealing hoses and hard pipes in
automobile engine cooling systems, power battery cooling systems, air systems, air
conditioning systems, etc.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in 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 Document.
GB/T 90.1 Fasteners – Acceptance inspection
GB/T 90.2 Fasteners – Marking and packaging
GB/T 944.1 Cross recesses for screws
GB/T 3280 Cold rolled stainless steel plate, sheet and strip
GB/T 5267.4 Passivation of corrosion-resistant stainless-steel fasteners
GB/T 6478 Steels for cold heading and cold extruding
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
GB/T 20878 Stainless and heat-resisting steels - Designation and chemical composition
GB/T 30512 Requirements for prohibited substances on automobiles
QC/T 326 Coding rules for automotive standardized parts
QC/T 625 Metallic coatings and conversion coatings for automobile
3 Terms and Definitions
For the purposes of this Document, no terms and definitions are necessary to be given.
4 Type and Size
The type, size and specification of Type B clamps are shown in Figure 1 and Table 1; while the
type, size and specification of Type C clamps are shown in Figure 2 and Table 2.
NOTE. It is recommended to select clamping range according to outer diameter of hose. The outer diameter of hose is the middle value of the
clamping range. For example, if the outer diameter of the hose is 64 mm, a clamp with a clamping range of 52 mm to 76 mm shall be selected.
a is a recommended value. The recommended tightening torque shall be determined according to the structure of the pipe joint, the hose material,
the sealing medium and the pressure. The maximum value shall be less than the guaranteed torque.
5 Technical Conditions
The technical conditions shall be in accordance with the requirements of Table 3.
Worm thread The thread is right-handed, the specific parameters are determined by the manufacturer
Surface defect The end edge of the toothed belt shall be rounded or curled outwards, without burrs and sharp edges
Prohibited substances Clamps on passenger car shall comply with the provisions of GB/T 30512
Marking The clamping range shall be marked on the toothed belt.
6 Test Methods
6.1 Dimensions
Use the dimensions in Figure 3 to inspect the mandrel and the clamping range D. Use universal
gauges to inspect the remaining dimensions.
NOTE. Dmax and Dmin are both the limit values of clamping range; length l shall be selected appropriately.
Figure 3 – Dimensional inspection mandrel
6.2 Materials
The materials shall meet the technical requirements and provide material inspection certificates
and be inspected when necessary.
6.3 Strap toughness
The toothed belt is bent 180° around a 4.8 mm steel mandrel and straightened again at the bend
of the toothed belt. The toothed belt shall not break, crack or have other failure forms during
and after the test.
6.4 Corrosion resistance
The sample state of the test is in bulk.
The clamp is subjected to neutral salt spray test in accordance with the provisions of GB/T
10125; and the corrosion resistance time shall meet the requirements of Table 3.
6.5 Torque
6.5.1 Test conditions
A new clamp shall be used for the test; and the test clamp shall not be trimmed or relubricated.
The maximum error of the torque wrench is ±3%.
6.5.2 Free torque
When the clamp is in the supply state, if rotating the worm in any direction, the torque of the
Type B clamp shall not exceed the value specified in Table 1, and the torque of the Type C
clamp shall not exceed the free torque value specified in Table 2.
6.5.3 Guaranteed torque
Assemble the clamp on the Dmin dimensional inspection mandrel (see Figure 3); rotate the worm;
and the Type B clamp shall reach the guaranteed torque value specified in Table 1.And the
Type C clamp shall reach the guaranteed torque value specified in Table 2.After removing the
torque, visually inspect the clamp assembly. No yield deformation or other defects that affect
performance are allowed, and it can be reused.
6.5.4 Repeated tightening torque
Assemble the clamp on the Dmax and Dmin ends of the dimensional inspection mandrel in turn;
rotate the worm; and the torque reaches the tightening torque specified in Table 1.Repeat each
for 2 times, and the clamp shall not lose its function.
6.6 Sealing test
6.6.1 Test conditions
New clamp and hose shall be used; and the maximum error of pressure measurement is 3%.
The sealing test shall use the device shown in Figure 4.The outer diameter of the hose is close
to the average value of the clamping range D of the clamp. The hose and the test mandrel shall
be a clearance fit. Take 2 pieces of each specification of clamps for testing, and the test liquid
is room temperature water.
7 Product Number
The product number of clamps with worm gear driver type B and type C shall comply with the provisions of QC/T 326.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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