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Bolt Hole Patterns and Compatibility Between AWWA Flange Classes

API Marketing

September 5, 2025

In the design and installation of AWWA flanges, pressure rating is an important factor, but equal attention must be given to the bolt pattern. The way a flange is drilled determines not only how it is fastened but also whether

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What Is the Pressure Rating of AWWA Flanges?

API Marketing

July 23, 2025

Pressure rating is one of the most critical specifications of AWWA flanges for a waterworks or industrial pipeline system. A flange’s pressure class determines its ability to safely withstand internal system pressures over time without failure. The American Water Works

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Choosing Between AWWA C207 and C228 Flanges

API Marketing

July 18, 2025

Two of the most referenced standards in the flange industry are AWWA C207 and AWWA C228. While they can look similar at first glance, they are engineered for very different environments and material performance. AWWA C207 flanges are typically used

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What Are AWWA Flanges? A Guide for Waterworks Projects

API Marketing

June 3, 2025

Share: More Posts What Are AWWA Flanges? An AWWA flange is a type of pipe flange designed for waterworks service. It follows standards developed by the American Water Works Association and is specifically intended for low-pressure water applications. AWWA flanges

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Transparency & Sustainability: Our EcoVadis Commitment

API Marketing

March 25, 2025

API International, Inc. is proud to announce our partnership with EcoVadis, the world’s most trusted provider of business sustainability ratings. This collaboration underscores our commitment to responsible business practices and continuous environmental, social, and ethical performance improvement. EcoVadis assesses companies

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Differences Between AWWA Flanges and ANSI Flanges

API Marketing

June 25, 2024

Flanges are crucial in piping systems, acting as connectors that join pipes, valves, pumps, and other equipment. Among the various standards for flanges, those specified by the American Water Works Association (AWWA) and the American National Standards Institute (ANSI) are

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Domestic Flanges: A Guide for Industrial Applications From API International, Inc.

API Marketing

April 16, 2024

If you work in manufacturing, construction, or industrial sectors, you understand the need for reliable, high-quality components. Domestic flanges are crucial pieces that connect pipes, valves, and other equipment, ensuring efficient and secure fluid or gas flow. In this comprehensive

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Press Release: API International Celebrates 45 Years of Customer Commitment, Innovation, and Service

API Marketing

February 16, 2024

Press Release: Tualatin, Oregon, 02/16/24 API International proudly announces its 45th anniversary by celebrating our dedication to exceptional service, steadfast inventory management, and continuous client commitment. Founded in 1979, API International has emerged as a leader in the manufacturing and

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Custom Flanges: Custom Flange Manufacturing

API Marketing

February 9, 2024

Our machine facility allows API to create custom flanges and other products that fulfill various standards while incorporating AIS, import, and exotic materials. We also provide quick turnaround customizations to our stock goods to meet customer demands. If you have

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Blind Flange: A Guide To Industrial Applications

API Marketing

February 9, 2024

A steel blind flange stands out as an essential element among the intricate network of industrial pipe system operations and serves diverse roles and functions across various industries. From facilitating pipeline closures to providing access points for maintenance, blind flanges

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KLAMPz K05 Lightweight Grooved Flexible Coupling

KLAMPz K05 Lightweight Grooved Flexible Coupling Reference Drawing

KLAMPz K05 Lightweight Flexible Coupling

SKU: K05-SUR Category: Closeout Products Tags: UL/FM, ULFM

These KLAMPz K05 Lightweight Flexible Couplings have discounted prices! The UL-listed and FM-approved versions are pressure-rated to 300psi with a maximum working pressure rating of 500psi. Ideal for waterworks and agriculture use. See the other K05 options that we stock.

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Dimensions

Dimensions: KLAMPz K05 Lightweight Flexible Coupling

ALL DIMENSIONS ARE IN INCHES UNLESS OTHERWISE STATED

Part Number	Nominal Size Inches	Pipe OD Inches	UL/FM Working Pressure	Non-UL/FM Working Pressure	Dimension D Inches	Dimension L Inches	Dimension W Inches	Bolt/Nut Size Inches
K050125PE-ULFM	1.25	1.660	300 psi	500 psi	2.50	4.23	1.77	0.375 x 1.5

Notes:

Flexible Couplings in straight runs should be supported as close to the coupling as possible, or within the distance of 1/6 the span, and evenly spaced.
Flexible Couplings provide either axial or longitudinal movement. The available movement for roll-grooved joints is 1/2 of cut-groove dimensions per ANSI/AWWA C606-06.
When pre-setting power nut-drivers, the following torque should not be exceeded. Excessive tightening of the nuts could result in joint failure. (Values Lbs-Ft.) 3/8″=50-59; 1/2″=81-92; 5/8″=147-190; 3/4″=177-179; 7/8″=202-221.
Coating options: Epoxy, Paint, Dacromet, Hot-Dip Galvanized.