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JB/T 5932 consists of the following parts, under the general title Crawler Tractor-dozer — Seal Track:
— Part 1: Assembly;
— Part 2: Link;
— Part 3: Shoe;
— Part 4: Pin and Bushing;
— Part 5: Track Bolt.
This part is Part 5 of JB/T 5932.
This part is drafted in accordance with the rules given in the GB/T 1.1-2009.
This part replaces JB/T 5932.5-1991 Machinery Vibrating Stress Relief Device — Basic Parameters in whole. The following technical deviations have been made with respect to the JB/T 5932.5-1991 (the previous edition):
— adjustment of the Normative References (see Clause 2; Clause 2 of Edition 1991);
— modification of the main dimension drawing of track bolt and deletion of the requirements of surface roughness (see Figure 1; Figure 1 of Edition 1991);
— addition of the requirements of designation and modification of the examples of designation (see 3.2; 3,2 of Edition 1991);
— modification of the hardness requirements of track bolt (see Table 2; Table 2 of Edition 1991);
— modification of the requirements for surface treatment of track bolt (see 4.2; Table 2 of Edition 1991);
— modification of the Inspection Rules (see Clause 5; Table 2 of Edition 1991);
This part was proposed by China Machinery Industry Federation.
This Part is under the jurisdiction of the SAC/TC 334 (National Technical Committee 334 on Earth-moving Machinery of Standardization Administration of China).
The previous editions of the standards replaced by this part are as follows:
— JB/T 5932.5-1991.
Crawler Tractor-dozer — Seal Track — Part 5: Track Bolt
1 Scope
This part of JB/T 5932 specifies the dimensions and designations, requirements, inspection rules, marking and packaging of track bolt for crawler tractor-dozer with thread sizes of M12×1.5 to M30×2.
This part is applicable to the seal track assembly of crawler tractor-dozer.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 90.1 Fasteners — Acceptance Inspection
GB/T 90.2 Fasteners — Marking and Packaging
GB/T 196 General Purpose Metric Screw Threads — Basic Dimensions
GB/T 197 General Purpose Metric Screw Threads — Tolerances
GB/T 1237 Designation System for Fasteners
GB/T 3077 Alloy Structure Steels
GB/T 3098.1 Mechanical Properties of Fasteners — Bolts, Screws and Studs
GB/T 3103.1 Tolerances for Fasteners — Bolts, Screws, Studs and Nuts
GB/T 5779.1 Surface Discontinuities of Fasteners on Bolts, Screws and Studs for General Requirements
GB/T 5779.3 Fasteners — Surface Discontinuities — Bolts, Screws and Studs for Special Requirements
3 Dimension and Designation
3.1 Dimension
The main dimensions of track bolt are shown in Figure 1 and Table 1.
Dimensions in millimetres
Figure 1 Main dimensions of track bolt
Table 1 Main dimensions of track bolt
Dimensions in millimetres
Thread size
d×P M12×1.5 (M14×1.5) M16×1.5 (M18×1.5) M20×2 (M22×2) M24×2 (M27×2) M30×2
— — — — M20×1.5 (M22×1.5) M24×1.5 (M27×1.5) M30×1.5
S Nominal dimension 18 21 24 27 30 34 36 41 46
Limit deviation 0
-0.43 0
-0.84 0
-1
emin 20.0 23.3 26.7 30.1 33.5 37.7 40.0 45.2 50.9
K Nominal dimension 12 13.5 15.5 16.5 19 20.5 22 24 26
Limit deviation ±0.55 ±0.65
SR 15 19 21 23 27 28 32 38 43
r 0.6 to 0.8 1.3 to 1.7
dW Nominal dimension 18 21 23 26 29 32 35 39 44
Limit deviation 0
-0.52
ds Nominal dimension 12 14 16 18 20 22 24 27 30
Limit deviation -0.095
-0.275 -0.110
-0.320 0
-0.210
b 24 26 28 30 32 34 36 38 40
L
(for reference only) 34 43 57 60 66 69 75 84 96
43 52 66 66 69 — 78 87 —
— — 90 96 72 — 90
— — 75 —
87
Note: Sizes in parentheses shall not be adopted as much as possible.
3.2 Designation
The designation of track bolt shall meet the requirements of GB/T 1237.
Example:
Track bolt with thread size of M20×1.5, L = 69mm, and performance rating = 10.9, designated as:
Track bolt JB/T 5932.5-2017 M20×1.5×69-10.9
4 Requirements
4.1 The technical requirements of track bolt are shown in Table 2.
Table 2 Technical requirements of track bolt
Item Requirements Standard No.
Material 35CrMoA or other materials that meet the requirements of this table may be used GB/T 3077
Performance rating Level 10.9 Level 12.9 GB/T 3098.1
Hardness 32 HRC to 39 HRC 39 HRC to 44 HRC
Hardness of Q sphere at the head 52 HRC to 60 HRC
Effective depth of hardened layer of Q sphere at the head 3 mm to 5 mm, when d = 12 mm; 4 mm to 7 mm, when d ≥ 14 mm
Surface defects GB/T 5779.1 GB/T 5779.3 —
Thread 6 g GB/T 196, GB/T 197
Dimensions and geometric tolerances are not indicated Grade A, when d ≤ 24 mm; Grade B, when d > 24 mm GB/T 3103.1
4.2 Track bolt shall be treated with anti-rust, anti-corrosion and other surface treatments.
4.3 The macrostructure of track bolt shall have fiber streamline in line with the shape.
4.4 The tightening torques of track bolt are shown in Table 3.
Foreword I
1 Scope
2 Normative References
3 Dimension and Designation
4 Requirements
5 Inspection Rules, Marking and Packaging
