冷镦加工是一种少切削或无切削的压力加工新工艺
金屬。它是一種利用金屬在下列因素作用下產生塑性變形的加工方法
外力作用下,在模具的幫助下,重新分配和轉移金屬的體積,以形成
所需的零件或坯料。冷镦工艺最适合生产标准的
螺栓、螺絲、螺帽、鉚釘和銷等緊固件
Description of a Square Oil Plug Screw
A square oil plug screw is a threaded fastener designed to seal oil or fluid ports in mechanical systems, such as engines, gearboxes, and hydraulic units. Its defining feature is a square-shaped head, which allows for easy installation and removal using a standard wrench or square-drive tool.
Key Features & Design Elements
1. Head Design
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Square head (typically 4-sided) for wrench engagement.
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Some versions have a flanged base to improve sealing and distribute pressure.
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Low-profile design to prevent snagging in tight spaces.
2. Thread Type
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Tapered threads (NPT – National Pipe Taper): Creates a tight seal when screwed in, commonly used in fluid systems.
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Straight threads (NPS/BSPP): Requires a sealing washer or O-ring to prevent leaks.
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Metric or SAE (Imperial) thread standards, depending on application.
3. Sealing Mechanism
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Integrated O-ring or rubber gasket (for reusable, leak-proof sealing).
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Copper or aluminum crush washer (single-use, deforms to create a seal).
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Tapered threads (self-sealing in NPT plugs).
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Some plugs have magnetic tips to capture metal debris in oil systems.
Primary Applications
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Engine oil drain plugs (cars, motorcycles, heavy machinery).
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Transmission & differential fill/drain plugs.
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Hydraulic system access points.
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Gearboxes, pumps, and industrial equipment.
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