---
title: "Flange Thickness Measurements Lookup - Hubs"
slug: "flange-thickness-measurements-lookup-hubs"
tags: ["FCM"]
updated: 2026-10-27T23:12:05Z
published: 2026-10-27T23:12:05Z
canonical: "ims-handbook.cenosco.com/flange-thickness-measurements-lookup-hubs"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://ims-handbook.cenosco.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Flange Thickness Measurements Lookup - Hubs

The user can specify the Hub size, however IMS uses the Clamp Size as a default. From this IMS determines the HC, Seal Ring Range min, Seal Ring Range max, Reading over 1/8 Balls, Reading over 1/4 Balls, and Tolerance.

Flange Thickness Measurements - Hubs:

| Hub Size | Seal Ring Range min | Seal Ring Range max | HC | Reading over 1/8 Balls | Reading over 1/4 Balls | Tolerance |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | 4 | 11 | 2 | 0.599 |  | 0.005 |
| 1 | 4 | 11 | 1.97 | 0.606 |  | 0.005 |
| 1.5 | 14 | 14 | 3.125 | 0.723 | 1.008 | 0.01 |
| 1.5 | 14 | 14 | 3.095 | 0.73 | 1.015 | 0.01 |
| 2 | 14 | 20 | 3.125 | 0.786 | 1.008 | 0.01 |
| 2 | 14 | 20 | 3.095 |  | 1.015 | 0.01 |
| 3 | 25 | 27 | 5 | 0.786 | 1.071 | 0.015 |
| 3 | 25 | 27 | 4.94 |  | 1.085 | 0.015 |
| 4 | 31 | 40 | 6 |  | 1.071 | 0.015 |
| 4 | 31 | 40 | 5.94 |  | 1.085 | 0.015 |
| 6 | 52 | 54 | 9.25 |  | 1.321 | 0.015 |
| 6 | 62 | 62 | 9.25 |  | 1.383 | 0.015 |
| 8 | 64 | 82 | 11.5 |  | 1.321 | 0.015 |
| 10 | 82 | 102 | 13.625 |  |  | 0.015 |
| 12 | 87 | 120 | 16 |  |  | 0.015 |
| 12 | 112 | 112 | 16 |  |  | 0.015 |
| 14 | 106 |  | 18.5 |  |  | 0.015 |
| 14 | 112 |  | 18.5 |  |  | 0.015 |
| 14 | 120 | 124 | 18.5 |  |  | 0.015 |
| 14 | 130 | 134 | 18.5 |  |  | 0.015 |
| 16 | 130 | 160 | 21 |  |  | 0.015 |
| 18 |  |  | 21 |  |  | 0.015 |
| 20 | 140 | 180 | 25 |  |  | 0.015 |