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1 Subject content
This standard specifies Grades A and B hexagon thin slotted nuts with fine pitch threads and thread specifications of M8 to M36. Grade A is for nuts with D ≤ 16, and Grade B is for nuts with D > 16.
2 Normative references
GB 196 General purpose metric screw threads - Basic dimensions
GB 197 General purpose screw threads - Tolerances and fits
GB 91 Split pins
GB 3098.4 Mechanical properties of fasteners - Fine pitch thread
GB 3103.1 Tolerances for fasteners bolts, screws and nuts
GB 5267 Electroplated coatings on threaded fasteners
GB 5279.2 Surface discontinuities of fasteners on nuts for general requirements
GB 1237 Designation system for fasteners
GB 90 Acceptance inspection, marking and packaging of fasteners
3 Dimensions
See the following figure and Table 1 for dimensions.
The bottom of the slot is allowed to be made into a flat bottom;
It is allowed to make flared threaded holes within the length (m–W);
The junction of the hexagon and the slotted end face of the nut is allowed to be rounded and blunt.
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Table 1 mm
Note: Whenever possible, specifications in parentheses shall not be used.
4 Technical conditions
See Table 2 for the technical conditions.
