螺纹公称直径D≥5mm 的六角螺母,应标记不锈钢组别,性能等级以及制造者标志。
对于六角螺母,最好在头部顶面用凹字或凸字,或者在头部侧面用凹字进行标记,(参见附图)。对于法兰螺母,当制造工艺不允许在头部顶面进行标记时,可在法兰上标记。
性能等级 | 45 | 50 | 60 | 70 | 80 | 100 | 110 |
标记符号 | 45 | 50 | 60 | 70 | 80 | 100 | 110 |
性能等级 | 45 | 50 | 60 | 70 | 80 | 100 | 110 |
标记符号 | 022 | 025 | 030 | 035 | 040 | 050 | 055 |
附图说明:
1—制造者的识别标志;
2—不锈钢组别;
3—性能等级(全承载能力)。
对于降低承载能力的螺母,应使用下表中规定的性能等级符号:
性能等级 | 45 | 50 | 60 | 70 | 80 | 100 | 110 |
标记符号 | 022 | 025 | 030 | 035 | 040 | 050 | 055 |
附图说明:
1—制造者的识别标志;
2—不锈钢组别;
3—性能等级(降低了承载能力)。
仅仅只有A2 和A4 奥氏体不锈钢,可以使用下图所示的替代标记。这种情况下,如果未规定性能等级,则适用性能等级为50 或025 的螺母。
说明:
s一对边宽度。
对于公称直径 D ≥ 5 mm 的左旋螺纹螺母,应用另外的左箭头进行标记(见下图)。最好将其标记在螺母的顶部,与性能等级标记于同一面。
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