| 选择规格尺寸 点击↓ 0# 1# 2# 3# 4# 5# 6# 8# 10# 12# 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 1-3/4 2 2-1/4 2-1/2 2-3/4 3 3-1/4 3-1/2 3-3/4 4 |
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| ①,材料 a、合金钢应符合ASTM A574 b、不锈钢应符合ASTM F837 ②,除非客户另有规定,否则制造商可以选择平头或滚花头。 对于滚花螺钉,最大头部直径应在滚花顶部测量,最小头部直径应对于那些没有滚花部分的螺钉,它是未滚花部分的直径或滚花顶部的直径,刚好在头部底部边缘的半径或倒角上方。 ③,螺纹: 螺纹为ASME B1.1 规定的统一螺纹,英寸制,UNRC粗牙或UNRF细牙系列,具体如下所述: 1. 螺钉公称直径0#(0.060 in.)~ 1 in. 的,为UNRC和UNRF系列,3A级精度; 2. 螺钉公称直径>1 in. ~ 1-1/2 in. 的,为UNRC和UNRF系列,2A级精度; 3. 螺钉公称直径>1-1/2 in. 的,为UNR系列,2A级精度。 有镀层或无镀层的检查验收,按ASME B1.3M中“22”体系要求。 3A级精度没有提供镀层容差。 ④,表面粗糙度: 对于公称直径小于等于5/8英寸且公称长度小于等于8倍螺钉公称直径的合金钢螺钉,其镀前的表面粗糙度要求为:在圆角和支承面上不超过63μin(算术平均值);螺纹的表面粗糙度不超过32μin(算术平均值)。 对于大规格、长螺钉及耐蚀钢螺钉,其镀前的表面粗糙度,杆部圆角和支承面不应超过125μin(算术平均值)。 通常,这些相当于机加工的螺钉表面,通过目测就可以判断是否符合相关的粗糙度标准。但是,必要时也应采用仪器对表面粗糙度进行测量。杆部和圆角面应轴向测量,支承面应在圆周面测量(见ASME B46.1《表面结构》)。 |
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