Poker Gauge: A Critical Measurement Tool in Ship Maintenance

Poker Gauge: A Critical Measurement Tool in Ship Maintenance

The propeller shaft in the after peak tank is equipped with inboard and outboard seals, which are designed to prevent sea water from entering the system. These seals typically consist of a rubber or plastic component that provides a watertight seal around the propeller shaft. Over time, these seals can wear out or become damaged, allowing sea water to enter the system and potentially causing costly repairs.

To ensure the continued operation of the ship's propulsion system, it is essential to regularly inspect and maintain the propeller shaft seals. One critical aspect of this maintenance process is the measurement of the seal gap, which is typically measured using a poker gauge. A poker gauge is a specialized tool designed specifically for measuring the gap between the propeller shaft and the hull of the ship.

Importance of Poker Gauge in Ship Maintenance

The poker gauge plays a crucial role in ensuring the proper functioning of the propeller shaft seals. Here are some reasons why this measurement tool is essential:

  1. Accurate Measurement: The poker gauge provides an accurate measurement of the gap between the propeller shaft and the hull, allowing maintenance personnel to identify any potential issues before they become major problems.
  2. Preventive Maintenance: By regularly measuring the seal gap using a poker gauge, maintenance personnel can perform preventive maintenance tasks to ensure that the seals remain in good condition and prevent costly repairs.
  3. Reduced Downtime: Regular measurement of the seal gap helps to identify potential issues before they cause downtime, which can result in significant losses for ship operators.

How to Buy Poker Gauge

If you are interested in purchasing a poker gauge for your ship maintenance needs, there are several options available:

  1. Online Platforms: You can search online platforms such as Made-in-China.com, which offers a wide range of Chinese suppliers and products.
  2. Specialized Stores: You can also visit specialized stores that sell marine equipment and tools.

Returns Policy

When purchasing a poker gauge from Japan Marine, you can expect the following returns policy:

  • Returns are accepted within 30 days of delivery
  • The product must be in its original condition and packaging
  • A full refund will be provided for new, unopened items

By choosing to purchase a poker gauge from Japan Marine, you can be confident that your investment is protected by a comprehensive returns policy.


The poker gauge is an essential tool for ensuring the proper functioning of the propeller shaft seals in ship maintenance. By regularly measuring the seal gap using this specialized tool, maintenance personnel can perform preventive maintenance tasks and reduce downtime, which can result in significant losses for ship operators.