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A Brief History of Carbon Steel – Part 2
For more info on this topic, check out last month’s post A Brief History of Carbon Steel – Part 1Carbon steel wasn’t always the reliable metal that we use for our blind flanges and forged steel rings that we use…

What Are the Components of a Wellhead and What Do They Do? – Part 1
FCI is one of the top wellhead component suppliers in the country, but what are the components of a wellhead and what do they do? This series of blog posts will explain these components and how they work within the…

A Brief History of Carbon Steel – Part 1
Carbon steel first appeared around the year 500 AD in Damascus steel swords as well as Japanese swords. They were prized for their sharp edges and sturdiness compared to other weapons of the era. The composition of these swords was…

Long Weld Neck Flanges – What are They Used for?
Where “standard” weld neck flanges are used extensively for pipes, long weld neck flanges (often abbreviated to LWN) are used in high pressure and high (or fluctuating) temperature situations primarily in the oil and gas industry. The long neck guides…

What is the Difference between ANSI and ASME Flanges?
The short answer is not a lot. ANSI is an abbreviation for the American National Standards Institute, a non-profit organization composed of members from a wide cross-section of individuals associated with them in academia, government agencies, businesses and organizations that…

FCI Connection Tolerances

Forged Vessel Components


  1. All dimensions are in inches.
  2. Tolerances and undercut dimensions are in accordance with ASME B16.5 and ASME Section VIII, Div. 1, Fig. 2-4.
  3. Tolerances for FCI products will be modified as necessary to maintain compliance with latest Code updates.
  4. Tolerances may be modified to meet other more stringent requirements upon Purchaser’s request.

* Specific tolerance may deviate but minimum wall thickness will be maintained.

Technical data contained in this section governed by ASME or other Codes/Specifications are subject to change and are therefore provided for information purposes only and are not to be used for design purposes. Refer to latest edition of applicable Code/Specification and addendums thereto for required design data.

Contact Us to Start Your Pressure Vessel Connection Manufacturing Project

We look forward to working with you on your project for ASME pressure vessel connections manufacturing. Our company is recognized around the world and we strive to meet and exceed client and industry standards. Contact us at (281) 441-4088 or email us at to begin your forged vessel components project and to speak to one of our expert team members.

Contact Us to Start Your Pressure Vessel Connection Manufacturing Project

Contact Us to Start Your Pressure Vessel Connection Manufacturing Project