What are the functions of stud bolts?
I. Core Functions
1. Connect two thick components
Threads are provided on both ends. One end is screwed into the threaded hole of the equipment body, while the other end is fitted with flanges or cover plates, secured with washers and nuts.
Ordinary single-headed bolts have short shanks and cannot penetrate thick parts, a problem perfectly solved by stud bolts.
2. Easy disassembly without damaging base internal threads
Only the outer nuts need to be removed for maintenance, with no need to unscrew the entire bolt. This prevents repeated wear and thread stripping of internal threads on the equipment housing.
It is widely applied to equipment requiring frequent cover opening for inspection.
3. Fasten and seal flanges
Used in pairs for pipeline flanges, pressure vessel flanges and valve flanges to evenly compress gaskets and achieve airtight and liquid-tight sealing
4. Specialized for high-temperature and high-pressure working conditions
Widely adopted in high-temperature boilers, chemical pipelines and pressure vessels. Single-headed bolts tend to seize under high temperature, whereas stud bolts deliver more stable stress performance.
II. Typical Application Scenarios
1. End covers of pressure vessels and storage tanks
2. Connections of pipeline flanges and valves
3. Engine cylinder heads and pump housings
4. Molds and heavy-duty equipment cabinets
5. High-temperature and high-pressure pipelines for chemical and oil & gas industries
III. Differences from Standard Hex Head Bolts
• Hex head bolts: Equipped with a hexagonal head on one end, only capable of single-side tightening. Not applicable for thick parts; frequent disassembly will damage internal threads of the base.
• Stud bolts: Headless with threads on both ends. One end is threaded into the equipment body, and the outer side is clamped by nuts. Ideal for thick housings, frequent disassembly and high-pressure sealing applications.
IV. Common Material Grades & Applications
• Grade 4.8 Carbon Steel: General low-pressure equipment and normal-temperature pipelines
• Grade 8.8 / 10.9 High Tensile Steel: Hydraulic systems and high-pressure flanges
• 304 / 316 Stainless Steel: Corrosive chemical environments and water treatment systems
• 35CrMo / 42CrMo Alloy Steel: High-temperature high-pressure boilers and pressure vessels
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