MT/T 187.3-1988 English PDF

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MT/T 187.3-1988: (Scraper conveyor fasteners. Prism head bolts Type A)

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
MT/T 187.3-1988	159	Add to Cart	2 days	(Scraper conveyor fasteners. Prism head bolts Type A)

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Basic data

Standard ID: MT/T 187.3-1988 (MT/T187.3-1988)
Description (Translated English): (Scraper conveyor fasteners. Prism head bolts Type A)
Sector / Industry: Coal Industry Standard (Recommended)
Classification of Chinese Standard: D93;J13
Classification of International Standard: 73.100.99
Word Count Estimation: 4,437
Date of Issue: 4/13/1988
Date of Implementation: 8/1/1988
Quoted Standard: MT 187.1
Summary: This standard applies to the coal mine under the scraper conveyor using the bolt type A (hereinafter referred to as bolts).

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. Prism head bolts Type A) Ministry of Coal Industry Standards MT/T 187.3-88 Scraper conveyor fasteners Edge Bolt Type A 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 Product Category 1 4 Technical requirements 3 Scraper conveyor fasteners Edge Bolt Type A

1 Application

This standard applies to the edge bolt type A (hereinafter referred to as bolt) used in the coal mine underground scraper conveyor.

2 Reference standards

MT 187.1 Scraper conveyor fastener bolt technical specifications

3 Product Categories

3.1 There are four specifications of M20, M22, M24 and M27. 3.2 Type and size are shown in the figure below and Tables 1 and 2. Table 1 mm d 20 22 24 27 Basic size 20 22 24 27 limit deviation H 18 0-1 20 0-1 22 0-1 24 0-1 H1 2 3 D 36 1 0 40 1 0 46 1 0 50 1 0 R 18 20 23 25 r 2.5 3.0 3.5 c 2.5 3 4 Table 1 (continued) mm d 20 22 24 27 β 0.6 0.7 t 2 2.5 n 2 2.5 l 4 4.5 a 3.5 4 Note. β --- Allowable offset between the screw head and the centerline of the screw; l --- thread end; a --- thread blank. Table 2 mm L0 (including screw tail) and weight per 1,000 steel bolts Basic size limit deviation L0 weight kg≈ L0 weight kg≈ L0 weight kg≈ L0 weight kg≈ ± 1.25 ° 151.9 ° 162.3 ° 209.4 ° 172.1 ° 222.2 ° 279.2 ° 183.1 ° 234.9 ° 294.1 ° 389.2 ± 1.5 ° 193.5 ° 247.5 ° 309.1 ° 408.5 50 205.8 ° 260.5 ° 324.0 ° 427.8 50 218.2 55 275.4 ° 338.9 ° 447.2 50 230.5 55 290.4 60 356.8 ° 466.5 50 242.8 55 305.3 60 374.4 65 489 50 255.1 55 320.2 60 392.1 65 511.4 ± 1.75 50 266.5 55 335.1 60 409.9 65 533.9 50 279.8 55 350.1 60 427.6 65 556.4 50 304.4 55 379.8 60 463.1 65 601.3 50 320.1 55 409.7 60 498.6 65 646.2 50 353.7 55 439.5 60 534.1 65 691.1 ± 2.0 50 378.4 55 469.3 60 569.6 65 736.0 50 403.0 55 499.1 60 605.1 65 781.0 50 427.7 55 529.0 60 640.6 65 825.0 50 452.3 55 558.8 60 676.1 65 870.8 50 477.0 55 588.6 60 706 65 915.1 50 501.6 55 618.4 60 747.1 65 960.7 Table 2 (continued) mm L0 (including screw tail) and weight per 1,000 steel bolts ± 2.5 50 526.3 55 648.3 60 782.6 65 1006.0 50 550.0 55 678 60 818.1 65 1031.0 50 600.2 55 737.7 60 889.0 65 1140.0 50 649.0 55 797.4 60 960.1 65 1230.0 Limit deviation of L0 Note. All the threads can be made with “°” in the table. 3.3 Marking example. Coarse teeth ordinary thread, large diameter 20mm, length 70mm, mechanical performance 8.8 grade edge bolt A. Bolt M20 × 70-8.8MT 187.3-88 3.4 Marking description.

4 Technical requirements

4.1 The mechanical properties of the bolt are not less than 8.8. 4.2 The technical conditions of bolts are in accordance with the provisions of MT 187.1. 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 drafters of this standard are Cong Peijian and Jia Delin. This standard entrusts Taiyuan Branch of Coal Science Research Institute with interpretation. ......

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