Square oil plug screw

Key Characteristics:
  1. Head Type:

    • Square-shaped head, designed for easy installation and removal with a wrench or square-drive tool.

    • Some may have a flanged base to improve sealing.

  2. Thread Type:

    • Typically features a tapered or straight (parallel) thread, depending on the sealing requirements.

    • May have NPT (National Pipe Taper) threads for better sealing in fluid systems.

  3. 材質:

    • Often made of steel, stainless steel, brass, or aluminum for corrosion resistance.

    • May be coated (e.g., zinc-plated, black oxide) for added durability.

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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

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.


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