A stud bolt (or double-end stud) is a threaded rod without a head, threaded on both ends. One end screws into a tapped hole (or has two nuts), and the other end receives a nut for clamping. They are common in flange joints and high-temperature applications.

How is stud bolt torque calculated?

The same formula as standard bolts: T = K × d × F, where K is the nut factor, d is the nominal diameter, and F is the target preload. The preload is F = η × Rp × As.

Why use stud bolts instead of regular bolts?

Stud bolts are preferred when: (1) the joint must be assembled/disassembled frequently, (2) high-temperature service (avoids bolt head distortion), (3) tapped holes in cast iron or aluminum, (4) flange connections per ASME B16.5.

What is the nut factor K for stud bolts?

The nut factor is the same as for standard bolts: K ≈ 0.20 for dry steel, 0.15 for lubricated, 0.12 for anti-seize paste. For stud bolts, both nut-bearing surfaces must be considered if two nuts are tightened.

Should I torque both nuts on a stud bolt?

In most flange applications, only the nut on the free end is torqued. The end screwed into the tapped hole (or the bottom nut on a through-stud) is installed to a snug fit first. In double-nut configurations, both nuts are torqued in a cross-pattern sequence.

免費工程工具

雙頭螺桿扭矩計算器

計算雙頭螺桿的鎖緊扭矩與預壓。採用與標準螺栓相同的扭矩方法，並針對雙頭螺桿應用進行調整。

ISO 898-1VDI 2230ASME PCC-1

雙頭螺桿尺寸

性能等級

利用率 η (%)

螺母係數 K

快速預設

結果

目標扭矩

—

預壓

—

降伏負荷 (100%)

—

應力面積

—

使用率

—

雙頭螺桿預壓與扭矩

採用與標準螺栓相同的方程式。對於雙頭螺桿，請確保螺母螺紋與軸承表面具有一致的潤滑，以獲得可預測的預壓。

⚠️ 基於扭矩的鎖緊具有 ±25% 的不確定性。對於關鍵的法蘭接頭，建議優先採用液壓張拉。

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雙頭螺桿扭矩計算器 — 免費預壓工具 | Vibromera

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雙頭螺桿預壓與扭矩

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