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🔩 螺栓扭矩计算器Bolt Torque Calculator
按 T = K × F × d 估算螺栓拧紧扭矩，可选力、直径和扭矩的单位（N/kN/lbf、mm/in、N·m/ft·lbf）。本地处理。Estimate bolt tightening torque with T = K × F × d, with selectable units for force, diameter and torque (N/kN/lbf, mm/in, N·m/ft·lbf). Processed locally.
使用说明与常见问题How-to & FAQ
「螺栓扭矩计算器」是什么？What is the Bolt Torque Calculator tool?
按 T = K × F × d 估算螺栓拧紧扭矩，可选力、直径和扭矩的单位（N/kN/lbf、mm/in、N·m/ft·lbf）。本地处理。Estimate bolt tightening torque with T = K × F × d, with selectable units for force, diameter and torque (N/kN/lbf, mm/in, N·m/ft·lbf). Processed locally.
如何使用「螺栓扭矩计算器」？How do I use the Bolt Torque Calculator tool?
在「螺栓扭矩计算器」中，填写「系数 K」、「预紧力 F」、「力单位」、「公称直径 d」、「直径单位」等参数，结果会随输入实时计算并显示在下方。In the Bolt Torque Calculator: Fill in "Factor K", "Clamp force F", "Force unit", "Nominal diameter d", "Diameter unit"; results are recalculated instantly as you type.
系数 K 怎么取？润滑有影响吗？What K should I use, and does lubrication matter?
K 是螺母系数（扭矩系数），影响很大：干燥钢螺栓约 0.2，镀锌约 0.18–0.22，润滑后约 0.15，同样的扭矩在润滑时会产生更大的预紧力。计算用 T = K × F × d，力、直径和扭矩的单位都可以选择（N/kN/lbf、mm/in、N·m/ft·lbf）。K is the nut factor (torque coefficient) and it matters a lot: about 0.2 for dry steel, 0.18–0.22 for zinc-plated and about 0.15 lubricated, so the same torque gives more clamp force when lubricated. It uses T = K × F × d, with selectable units for force, diameter and torque (N/kN/lbf, mm/in, N·m/ft·lbf).
能举个计算实例吗？Can you show a worked example?
例如在「螺栓扭矩计算器」中填 系数 K = 0.2，预紧力 F = 20，力单位 = kN，公称直径 d = 10，直径单位 = mm，扭矩单位 = N·m，结果区显示：扭矩 T：40 N·m；（换算）：29.5025 ft·lbf；计算用值：K = 0.2 · F = 20,000 N · d = 10 mm；ℹ T = K × F × d。K 为螺母系数（扭矩系数）：干燥钢螺栓约 0.2，镀锌约 0.18–0.22，润滑后约 0.15。结果为估算值，关键连接请以厂家扭矩表为准。For example, entering Factor K = 0.2, Clamp force F = 20, Force unit = kN, Nominal diameter d = 10, Diameter unit = mm, Torque unit = N·m in the Bolt Torque Calculator gives: Torque T: 40 N·m; (converted): 29.5025 ft·lbf; Values used: K = 0.2 · F = 20,000 N · d = 10 mm; ℹ T = K × F × d. K is the nut factor (torque coefficient): about 0.2 for dry steel, 0.18–0.22 for zinc-plated, about 0.15 lubricated. This is an estimate; use the…
哪些输入会被检查？Which inputs are validated?
「螺栓扭矩计算器」会检查这些输入——「系数 K」、「预紧力 F」、「公称直径 d」：必须填写，须大于 0；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Bolt Torque Calculator checks its inputs — "Factor K", "Clamp force F", "Nominal diameter d": required, must be greater than 0; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.
有哪些选项可以调整？What options can I adjust?
「螺栓扭矩计算器」的设置：「系数 K」默认 0.2；「预紧力 F」默认 20；「力单位」可选 N、kN、lbf（默认 kN）；「公称直径 d」默认 10；「直径单位」可选 mm、in（默认 mm）；「扭矩单位」可选 N·m、ft·lbf（默认 N·m）。每次生成结果都按当前设置处理。Settings in the Bolt Torque Calculator — "Factor K" default 0.2; "Clamp force F" default 20; "Force unit": N, kN, lbf (default kN); "Nominal diameter d" default 10; "Diameter unit": mm, in (default mm); "Torque unit": N·m, ft·lbf (default N·m). The result always uses the current settings.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「螺栓扭矩计算器」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Bolt Torque Calculator uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「螺栓扭矩计算器」免费吗？需要注册吗？Is the Bolt Torque Calculator free? Do I need an account?
「螺栓扭矩计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Bolt Torque Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.