Oil plug screw with hole red

Cold heading process is one of the new processes for pressure machining of less or no cutting
metal. It is a processing method that utilizes the plastic deformation of metal under the action of
external forces, and with the aid of molds, redistributes and transfers the volume of metal to form
the required parts or blanks. The cold heading process is most suitable for producing standard
fasteners such as bolts, screws, nuts, rivets, and pins.etc

Oil Plug Screw with Red Hole – Overview

An oil plug screw with a red hole is a specialized drain plug designed for easy visual inspection of oil flow or leakage, often used in automotive, industrial, or high-performance applications. The red hole (or colored indicator) serves as a quick-check feature to confirm proper sealing or detect oil seepage.

Key Features & Functions

1. Red Hole Design

• Purpose: Acts as a visual indicator for oil presence or leaks.

• How It Works:

  • If oil is visible in the hole, it may indicate a seal failure or residual oil after a change.

  • In some designs, the hole helps vent air during oil drainage.

• Alternative Colors: Some plugs use green, blue, or yellow for different applications.

2. Material & Construction

• Metal: Typically steel, aluminum, or brass with corrosion-resistant coatings.

• Thread Type: Matches standard sizes (e.g., M12x1.25, M14x1.5).

• Magnetic Option: Some versions include a magnetic tip to capture metal debris.

3. Head & Drive Types

• Hex Head (6mm–17mm): Standard for wrench/socket use.

• Allen Key Drive: Low-profile, common in performance vehicles.

• Washer/Seal: Often includes a copper or aluminum crush washer for a tight seal.

4. Applications

• Performance Engines: Allows quick leak checks in race cars or modified engines.

• Industrial Machinery: Used in hydraulic systems or gearboxes for easy inspection.

• Motorcycles/ATVs: Compact designs with visual indicators for maintenance.

Benefits of a Red Hole Oil Plug

✔ Quick Leak Detection – Visual warning of seal failure.
✔ Improved Drainage – Some designs reduce oil “glugging” during changes.

Installation Notes

• Torque Specs: Follow manufacturer guidelines (typically 18–25 ft-lbs for cars).

• Seal Replacement: Always use a new crush washer to prevent leaks.

• Inspection: Periodically check the hole for oil residue.

Variations & Related Products

• “Tattle-Tale” Plugs: Have a small hole that weeps oil if loose.

• Vented Drain Plugs: Use the hole for air escape during draining.

• Color-Coded Plugs: Different colors for oil, transmission, or differential fluids.

Who Should Use It?

• Mechanics who want a quick visual check for leaks.

• Racers/Enthusiasts monitoring high-stress engines.

• Industrial Users needing easy maintenance checks.