Choosing fastener size is not only a catalog task. The wrong diameter, length, or thread pitch can cause poor clamp load, thread stripping, loose joints, or installation delays. For buyers, the safest approach is to define the assembly first, then select the fastener.<\/p>\n\n\n\n
Before checking price, confirm how the fastener will be used. A machine guard, steel bracket, tapped casting, anchor plate, and structural joint do not need the same size logic.<\/p>\n\n\n\n
Review the required load, material thickness, hole size, access space, corrosion exposure, and whether the part uses a nut or tapped hole. For general options, buyers can compare common \u7d27\u56fa\u4ef6\u4ea7\u54c1<\/a> \u5728\u7f29\u5c0f\u89c4\u683c\u4e4b\u524d\u3002<\/p>\n\n\n\n Diameter affects strength and bearing area. Larger diameter may increase capacity, but it also needs larger holes, more space, and higher tightening force.<\/p>\n\n\n\n Do not select diameter by appearance. Confirm the drawing, standard, and application load. For common metric and inch parts, \u6807\u51c6\u7d27\u56fa\u4ef6<\/a> usually provide the most cost-effective starting point.<\/p>\n\n\n\n Length must allow full joint clamping without bottoming out or leaving too little thread engagement.<\/p>\n\n\n\n \u67e5\u770b\uff1a<\/p>\n\n\n\n For bolts with nuts, full nut engagement is normally expected. For blind tapped holes, confirm usable thread depth and bottom clearance.<\/p>\n\n\n\n Thread pitch controls compatibility. Metric coarse, metric fine, UNC, and UNF threads are not interchangeable.<\/p>\n\n\n\n Use coarse threads for general assembly, faster installation, and softer materials. Use fine threads where adjustment, vibration control, or limited engagement length requires closer thread spacing. Always follow the drawing or engineering standard.<\/p>\n\n\n\nDiameter, Length and Pitch: Key Differences<\/h2>\n\n\n\n
Size Item<\/th> \u8fd9\u610f\u5473\u7740\u4ec0\u4e48<\/th> \u4e70\u5bb6\u68c0\u67e5\u70b9<\/th><\/tr><\/thead> \u76f4\u5f84<\/td> Nominal size, such as M10 or 3\/8 inch<\/td> Must match hole, load, and mating thread<\/td><\/tr> \u957f\u5ea6<\/td> Distance measured by product standard<\/td> Must cover grip thickness, washer stack, and nut engagement<\/td><\/tr> \u87ba\u8ddd<\/td> Distance between metric threads or threads per inch<\/td> Must match nut or tapped hole exactly<\/td><\/tr> \u87ba\u7eb9\u957f\u5ea6<\/td> \u5168\u87ba\u7eb9\u6216\u90e8\u5206\u87ba\u7eb9<\/td> Affects grip, shear area, and installation<\/td><\/tr> \u5934\u578b<\/td> Hex, socket, flange, countersunk, pan head<\/td> Must match tool access and bearing surface<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n How to Choose Diameter<\/h2>\n\n\n\n
Match Load and Hole Size<\/h3>\n\n\n\n
How to Choose Length<\/h2>\n\n\n\n
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How to Choose Thread Pitch<\/h2>\n\n\n\n