Square oil plug screw

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

• Square head (typically 4-sided) for wrench engagement.

• Some versions have a flanged base to improve sealing and distribute pressure.

• Low-profile design to prevent snagging in tight spaces.

2. Thread Type

• Tapered threads (NPT – National Pipe Taper): Creates a tight seal when screwed in, commonly used in fluid systems.

• Straight threads (NPS/BSPP): Requires a sealing washer or O-ring to prevent leaks.

• Metric or SAE (Imperial) thread standards, depending on application.

3. Sealing Mechanism

• Integrated O-ring or rubber gasket (for reusable, leak-proof sealing).

• Copper or aluminum crush washer (single-use, deforms to create a seal).

• Tapered threads (self-sealing in NPT plugs).

• Some plugs have magnetic tips to capture metal debris in oil systems.

Primary Applications

• Engine oil drain plugs (cars, motorcycles, heavy machinery).

• Transmission & differential fill/drain plugs.

• Hydraulic system access points.

• Gearboxes, pumps, and industrial equipment.