1 Scope
This document specifies the type dimensions, technical conditions and markings for live knuckle bolts.
This document applies to bolts with a thread size of M5 to M39 and product grades A, B and C.
2 Normative references
The contents of the following documents constitute the essential provisions of this document through the normative references in the text. Among them, note the date of the reference document, only the date of the corresponding version applies to this document; do not note the date of the reference document, its latest version (including all the revision of the list) applies to this document.
GB/T 3 Common thread finish, shoulder distance, receding groove and chamfer
GB/T 90.1 Acceptance inspection of fasteners
GB/T 90.2 Marking and packaging of fasteners
GB/T 193 General thread diameter and pitch series
GB/T 1237 Fastener marking methods
GB/T 1800.1 Product geometrical specifications (GPS) Linear dimensional tolerances ISO code system Part 1: Tolerances, deviations and
Basis of fit
GB/T 3098.1 Fastener mechanical properties bolts, screws and studs
GB/T 3098.6 Fasteners mechanical properties of stainless steel Eumenes bolts, screws and studs
GB/T 3103.1 Fastener tolerances bolts screws studs and nuts
GB/T 5267.1 Fastener plating
GB/T 5267.2 Fasteners non-electrolytic zinc flake coating
GB/T 5267.3 Fasteners hot dip galvanized layer
GB/T 5276 Fasteners bolts, screws . Studs and nuts size code and marking
GB/T 5779.1 Fasteners surface defects bolts, screws and studs general requirements
GB/T 9145 General thread medium precision limit size of the preferred series
GB/T 9146 Limit dimensions of the preferred series of common threads with rough accuracy
GB/T 12362 Tolerances and machining allowances for steel die forgings
GB/T 16938 General technical conditions for fasteners bolts, screws, studs and nuts
3 Terminology and definitions
There are no terms and definitions to be defined in this document.
4 Type and dimensions
The type and dimensions of the bolts are shown in Figure 1, Table 1 and Table 2.
Dimensional designations and labelling shall conform to GB/T 5276.
5 Directional and positional tolerances
Tolerances for perpendicularity and symmetry are in accordance with Figure 3.
6 Technical conditions and referenced standards
Technical conditions and referenced standards are shown in Table 3.
7 Marking
7.1 Marking methods
Marking methods according to GB/T 1237. .
7.2 Marking examples
Example 1; thread specification M10. nominal length l = 70 mm, performance class 4.6, the surface is not treated with the markings of the C-class live joint bolts:
Bolt GB/T 798 M10X 70
Example 2: Thread size M10 nominal length l= 70 mm, performance class 4.6, markings for a fully threaded live bolt of class C without surface treatment:
Bolt GB/T 798 MI0X70
Example 3: Thread size M30. nominal length l= 200mm. pin hole diameter 27, performance class 4.6, markings for grade B untreated live bolts:
Bolt GB/T 798 M30X200X27 B
Bibliography
1 Scope
2 Normative references
3 Terminology and definitions
4 Type and dimensions
Dimensional designations and labelling shall conform to GB/T 5276.
5 Directional and positional tolerances
6 Technical conditions and referenced standards
7 Marking
Bibliography
