JB/T 2984.3-1999 This standard is a revision of ZB J85 004.2-87 "Nuts for crawler tracks and gear segments of crawler bulldozers". During the revision, only editorial changes were made according to relevant regulations, and the main technical content remained basically unchanged. This standard specifies the types and dimensions, requirements, test methods, inspection rules, marking methods, packaging, transportation and storage of nuts for crawler tracks and gear segments of crawler bulldozers. This standard was first issued on April 4, 1987. JB/T 2984.3-1999 Nuts for crawler tracks and gear segments of crawler bulldozers JB/T2984.3-1999 Standard download decompression password: www.bzxz.net

ICS53.100
Machinery Industry Standard of the People's Republic of China
JB/T2984.3-1999
Crawler bulldozer
Nuts for track shoe and sprocket segment1999-08-06Published
National Bureau of Machinery Industry
2000-01-01Implementation
JB/T2984.3—1999
This standard is a revision of ZBJ85004.287 "Nuts for track and sprocket segment of crawler bulldozer". During the revision, the original standard was edited, and the main technical content remained basically unchanged. This standard replaces ZBJ85004.2—87 from the date of implementation. This standard is proposed and managed by the Technical Committee for Standardization of Construction Machinery. The drafting units of this standard are: Tianjin Engineering Machinery Research Institute, Hubei Yangxin High Strength Bolt Factory, Ningbo Zhenhai High Strength Fasteners Industrial Company, Changshu Yinghu International Standard Fasteners Co., Ltd. The main drafters of this standard are: Li Mingxiang, Deng Changming, Zhang Xiankang, Zhao Qingyun. This standard was first issued on April 4, 1987 and revised for the first time in 1999. 1 Scope
Machinery Industry Standard of the People's Republic of China
Nuts for track shoe and sprodket segmentCrawlerbulldozer-
Nuts fortrack shoe and sprodket segmentJB/T2984.3—1999
Replaces ZBJ85004.2-87
This standard specifies the types and dimensions, requirements, test methods, inspection rules, packaging, transportation and storage of nuts for track and gear segments of crawler bulldozers.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T901985
GB/T 193-1981
GB/T1971981
GB/T3098.2—1982
GB/T 3098.41986
3 Types and sizes
Fastener acceptance inspection, marking and packaging
Ordinary thread diameter and pitch series (diameter 1~600mm)Ordinary thread tolerance and fit (diameter 1~355mm)Mechanical properties of fastenersNuts
Mechanical properties of fastenersFine pitch nuts
The types and sizes of nuts shall be as specified in Figure 1 and Table 1. Marking example:
Nuts with fine pitch ordinary thread, diameter 22mm, pitch 1.5mm, thread accuracy 6H, mechanical property grade 8.8 are marked as: Nut M22×1.5-6H-8.8JB/T2984.3-1999
Approved by the State Machinery Industry Bureau on 1999-08-06 and implemented on 2000-01-01
4 Requirements
Basic dimensions
Nuts are made of 45 steel.
JB/T2984.3—1999
Limit deviation
Basic dimensions
Limit deviation
The thread is made of fine pitch ordinary thread specified in GB/T193, and its tolerance zone is 6H grade specified in GB/T197. The surface roughness R value of the side of the internal thread is 3.2um, and the surface roughness of the minor diameter is not specified. The surface of the nut should be oxidized and coated with anti-rust oil. Other technical conditions shall comply with the provisions of GB/T3098.2. The mechanical properties of the nut shall comply with the provisions of Table 2. Table 2
5 Test method
5.1 Guaranteed load test
Tensile strength
Yield strength6
Impact value (
Mass of every 1000
nuts
The guaranteed load test of the nut shall be carried out in accordance with the provisions of 8.1 of GB/T3098.41986, and the guaranteed load shall be in accordance with the provisions of Table 3. 5.2
Hardness test
The hardness test of the nut shall be carried out on the bearing surface or side. The average hardness of three points with an interval of 120P is taken as the hardness of the nut. 2
Thread diameter
Inspection rules
JB/T2984.3—1999
Nominal stress cross-sectional area As
The nut shall be inspected by the inspection department of the manufacturer according to the product drawings and this standard, and the nut shall have a factory certificate. Guaranteed load
≥123
≥164
≥212
≥267||tt| |≥327bZxz.net
≥393
≥630
≥769
Nuts should be sampled before leaving the factory. The sampling method is in accordance with the provisions of GB/T90, n=80 pieces, and the qualified quality level (AQL) and qualified judgment number (Ac) are specified according to the importance of the inspection items. Packaging, transportation and storage
Nuts should be cleaned of dirt and metal chips before packaging, and the surface should be coated with rust inhibitor. After assembly with bolts, they should be packed in wooden boxes lined with moisture-proof paper or 7.1
Package, and ensure that the parts will not be damaged during normal transportation. The weight of a single box shall not exceed 30kg. A certificate of conformity signed by the inspector shall be attached to the box, and the name, model and quantity of the product shall be indicated. 7.2
The box shall be marked with:
a) manufacturer's name;
b) product name and model;
c) product specifications or marks;
d) number of pieces and net weight:
e) manufacturing (ex-factory) date.
7.4 After packing, the nuts should be placed in a ventilated and dry warehouse. Under normal storage conditions, they will not rust within one year from the date of leaving the factory. 3
Republic of China
Mechanical Industry Standard
Nuts for crawler tracks and gear segments of crawler bulldozers JB/T29843-1999
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing: Postal Code 100044)*
Book size 880×12301/16 Printing sheet 1/2 Number of words 8000 First edition in March 2000 First printing in March 2000 Number of copies 1-500 Price 500 yuan
No. 99-1278.2
Mechanical Industry Standard Service Network: http/AvwwJB.ac.cn6
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