Made from 18-8 stainless steel, these button head screws have good chemical resistance and may be mildly magnetic. Length is measured from under the head. Passivated stainless steel screws provide added protection against oxidation and corrosion. For technical drawings and 3-D models, click on a part number.

在 硬件 结构设计中，了解螺丝M标准、螺丝M直径以及螺帽M直径是非常重要的。 M2 x 3.0mm表示M2的螺丝，螺杆长度为3.0mm，实际螺纹直径为2mm。 螺杆螺牙，螺丝直径、螺丝长度。 螺丝M标准，即公制螺纹标准，是国际上广泛采用的螺纹规格之一。 它以米制单位为基础，规定了螺纹的形状、尺寸和公差，确保了不同厂家生产的螺丝和螺帽能够互换使用。 在螺丝型号中，M代表普通螺纹，其后跟的数字表示螺纹的公称直径，如M2、M3、M4等。 螺丝M直径指的是螺丝杆 …

The following table chart defines standard metric external thread size M1.6 to M18 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. Do not use these values for standard metric internal thread design. All units in mm. These are the M Profile limiting Dimensionings.

螺纹的种类. 螺纹有很多种分法. 按螺纹形状分为三角形、梯形、锯齿形、圆弧螺纹. 按标准分为公制、美制、英制

①, 仅用于发动机的火花塞。 ②, 仅用于轴承的锁紧螺母。 ③, 优先选用第一系列直径，其次选择第二系列直径，最后选择第三系列直径。 ④, 尽可能地避免选用括号内的螺距。

M2.2 : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more

MroMax 30Pcs M2 x 5mm Pan Head Phillips Machine Screws, 304 Stainless Steel 18-8, Fully Thread, Metric Silver Gray Cross Head Screws Bolts for Computers, Camera and Other Small Electronic Devices

MroMax 30Pcs M2.5 x 5mm Pan Head Phillips Machine Screws, 304 Stainless Steel 18-8, Fully Thread, Metric Silver Gray Cross Head Screws Bolts for Computers, Camera and Other Small Electronic Devices

Metric thread drill and tap chart with detailed information on tap drill sizes and thread sizes.