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MT/T 187.1-1988: (Scraper conveyor fasteners bolts technical conditions)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| MT/T 187.1-1988 | English | 119 |
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(Scraper conveyor fasteners bolts technical conditions)
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MT/T 187.1-1988
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PDF similar to MT/T 187.1-1988
Standard similar to MT/T 187.1-1988 MT/T 716 MT/T 661 MT 76 MT/T 717 MT 233 Basic data | Standard ID | MT/T 187.1-1988 (MT/T187.1-1988) | | Description (Translated English) | (Scraper conveyor fasteners bolts technical conditions) | | Sector / Industry | Coal Industry Standard (Recommended) | | Classification of Chinese Standard | D93;J13 | | Classification of International Standard | 73.100.99 | | Word Count Estimation | 2,283 | | Date of Issue | 4/13/1988 | | Date of Implementation | 8/1/1988 | | Quoted Standard | GB 196; GB 197; GB 3098.1; GB 3103.1; GB 90 | | Summary | This standard applies to bolts used in coal mine scraper conveyors and scraper repositories. | MT/T 1: ---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.
(Scraper conveyor fasteners bolts technical conditions)
Ministry of Coal Industry Standards
MT/T 187.1-88
Scraper conveyor fasteners
Bolt technical conditions
1988-04-13 Approved 1988-08-01
Approved by the Ministry of Coal Industry of the People's Republic of China
Contents
1 Scope of application 1
2 Normative references 1
3 Technical requirements 1
4 Test method 1
5 Acceptance inspection, marking and packaging 1
Scraper conveyor fasteners
Bolt technical conditions
1 Application
This standard applies to bolts used in scraper conveyors and scraper transferers in coal mines.
2 Reference standards
GB 196 basic thread size (diameter 1 ~ 600mm)
GB 197 Tolerance and fit of common thread (diameter 1 ~ 355mm)
GB 3098.1 Mechanical properties of fasteners Bolts, screws and studs
GB 3103.1 Tolerances for fasteners Bolts, screws and nuts
GB 90 Fastener acceptance inspection, marking and packaging
3 Technical requirements
3.1 Bolts shall meet the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures.
3.2 The marking system for bolt performance levels shall be implemented in accordance with GB 3098.1.
3.3 The bolt material is medium carbon steel or low carbon alloy steel. The chemical composition and heat treatment requirements shall be implemented in accordance with the provisions of GB 3098.1.
3.4 The threaded part of the bolt shall meet the following requirements.
a. The basic size of the thread is in accordance with the provisions of GB 196;
b.Thread tolerance is according to GB 197, thread diameter tolerance is 8g;
c. The maximum allowable value of the surface roughness Ra of the thread is 12.5 μm;
d. No cracks, burrs or breaks are allowed on the thread surface.
3.5 There must be no wrinkles, cracks, lack of meat, or overheating on the screw surface.
3.6 Bolts shall be surface passivated.
3.7 Bolt tolerances are in accordance with the provisions of GB 3103.1. Product grades are A grade (d≤M16) and B grade (d > M16).
3.8 When the material and process of the product are changed, a type test shall be carried out. The type test shall be carried out in accordance with Chapter 4 of this standard.
4 Test method
4.1 The mechanical properties test items of bolts include tensile test, hardness test, guaranteed load test and decarburization test.
4.1.1 To simplify the procedure, the minimum hardness test may be used instead of the tensile test. In case of dispute, the tensile test is used as the arbitration method.
4.1.2 Decarburization test is only done when required by the user, generally not done.
4.2 The test method for the mechanical properties of bolts shall be carried out in accordance with the test method specified in Class 8.8 Class B project in GB 3098.1.
5 Acceptance inspection, marking and packaging
5.1 The products shall be inspected by the technical inspection department of the manufacturer.The manufacturer shall ensure that each batch of products shipped meets the requirements of this standard and is accompanied by
Certificate of product quality.
5.2 The product acceptance inspection, marking and packaging shall meet the requirements of GB 90.
5.3 The manufacturer's mark is allowed on the surface of each product.
Additional information.
This standard was proposed by the Technology Development Department of the Ministry of Coal Industry of the People's Republic of China.
This standard is under the jurisdiction of the Taiyuan Branch of the Coal Research Institute.
This standard was drafted by Harbin Coal Mine Machinery Research Institute.
The main drafter of this standard is Cong Peijian.
This standard entrusts Taiyuan Branch of Coal Science Research Institute with interpretation.
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