When it comes to precision manufacturing, the difference between a perfect part and a rejected one can come down to a fraction of a millimeter. That’s where tolerances come in.

At Custom Precision Technologies (CPT), we understand that tolerances aren’t just numbers on a blueprint: they’re the difference between reliable performance and costly failure. Whether you’re in aerospace, marine, electronics, or industrial applications, tight tolerances ensure that parts fit, function, and last.

In this article, we’ll break down:

• What tolerances are

• Why they matter

• How CPT ensures precision across its services

• What types of tolerances we regularly work with

What Are Tolerances?

Tolerances define the acceptable amount of variation from a specified dimension in a manufactured part. In simpler terms, it’s how much a part can deviate from the intended measurement and still function correctly.

Tolerances are usually specified as:

• Plus or minus (+/-) a certain dimension (e.g., 2.000” ± 0.005”)

• Limit dimensions, where a part must fall between a minimum and maximum (e.g., 1.995” – 2.005”)

These are determined based on the intended function, fit, and environmental stress the part will face.

Why Are Tolerances Important?

A part with incorrect tolerances can lead to:

• Misalignment

• Leaks in sealed systems

• Premature wear

• Mechanical failure

• Higher assembly costs

In industries like marine, aerospace, defense, and medical, tight tolerances are critical. A millimeter off in a gasket or bracket could compromise an entire system.

Real-World Tolerances: Examples by Industry

• Marine (Yacht Components): Brackets, housings, and engine mounts often require tolerances within ±0.010” to ensure vibration resistance and water-tight integrity.

• Aerospace: Fixtures and structural parts demand extremely tight tolerances, sometimes down to ±0.002”, to meet safety and aerodynamic standards.

• Electronics: Small enclosures and heatsinks might require tolerances as tight as ±0.005” to ensure proper thermal and spatial performance.

• Defense: Military-grade components must meet rigorous specs, with tolerances from ±0.001” to ±0.010” depending on function and fit.

Partner With CPT for Tight-Tolerance Projects

If your project demands precision, consistency, and reliability, CPT is your trusted fabrication partner. Our experienced team works closely with clients to determine ideal tolerance levels, balancing performance, cost, and manufacturability. We can handle tolerances as tight as ±0.003″.

From prototypes to full production runs, we deliver parts that meet or exceed spec every time.

Need a quote or want to discuss your project tolerances? Contact us today at 954-975-5518 or visit our website to learn more