Square oil plug screw

冷間圧造加工は、切削の少ない、あるいは切削を必要としない新しい圧造加工のひとつである。
金属。の作用による金属の塑性変形を利用した加工法である。
外力を受け、金型の助けを借りて、金属の体積を再分配し、移動させる。
必要な部品やブランクを製造します。冷間圧造工程は、標準的な
ボルト、ネジ、ナット、リベット、ピンなどの留め具。

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.