Keystone Pinch Clamps

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Keystone Mechanical and Stainless Pinch Clamps
KSC

Keystone Mechanical Pinch Clamp

Murray KEYSTONE clamping products offer superior strength from 100% stainless steel.
Keystone Pinch Clamps are mechanically attached and are quick and easy to install, and provide a uniform, tamper proof seal. They are widely used on both soft hose and rigid plastic pipe. You will find these clamps anywhere you connect poly pipe. Ear clamps are excellent for use in a multitude of irrigation and water supply systems, on fuel and vapor lines, to attach dust shields and air filters, for beverage supply lines, for car wash supply lines, and for securing bundles of cable. When crimping with a hand tool, Murray’s true Keystone geometry, located in the ear area, dramatically reduces miscrimps. Keystone Mechanical Pinch clamps are 100% Stainless Steel.
Common Clamping Applications:
Irrigation * Water Supply * Fuel & Vapor lines * Beverage Supply Lines * Car Wash Supply Lines * Dust Shields & Air Filters * Bundles of Cable
Specifications
Clamp Size Chart
Technical drawing of a circular container with a top latch, showing front, side, and top views with diameter marked as A.
"A" Diameter Range
Part Number Metric Decimals
Open Closed Open Closed
KSC 3198* 19.8 16.6 0.78 0.655
KSC 3210* 21 17.9 0.83 0.705
KSC 3256* 25.6 22.5 1.01 0.885
KSC 3271* 27.1 24 1.07 0.945
KSC 3316* 31.6 28.5 1.245 1.12
KSC 3331* 33.1 30 1.3 1.18
KSC 3346* 34.6 31.5 1.36 1.24
KSC 3410* 41 37.9 1.615 1.49
KSC 3425* 42.5 39.4 1.675 1.55
KSC 3485* 48.5 45.5 1.91 1.787
**Popular irrigation sizes are available for immediate shipment packaged in poly bags. Please inquire on
availability of other packaging configurations and lead time for other sizes. Other sizes, shapes and materials are available upon request, subject to minimum order quantities.
PDF Specification Sheet
Keystone Mechanical and Stainless Pinch Clamps

Keystone KSC Mechanical and Stainless Pinch Clamps

Murray Corporation manufactures the Keystone KSC series of mechanical and stainless pinch clamps, engineered for secure, tamper-resistant connections on small-diameter hoses and tubing. The KSC mechanical design provides reliable clamping performance in applications where a permanent, low-profile connection is required and space is limited.

Design and Construction

The Keystone KSC mechanical pinch clamp features a one-piece stainless steel construction with pre-formed ears that are crimped during installation to create a tight, uniform seal around the hose. Unlike welded pinch clamp designs, the KSC mechanical clamp uses a precision-formed mechanical closure that eliminates the heat-affected zone associated with welding, maintaining consistent material properties across the entire clamp body.

This construction method offers several advantages. The mechanical forming process ensures repeatable dimensional accuracy across high-volume production runs. The absence of weld splatter or weld-related surface irregularities means the clamp sits flush against the hose surface for uniform sealing pressure. The stainless steel material provides excellent corrosion resistance for applications involving water, coolant, fuel, and other fluids.

Applications

Keystone KSC mechanical pinch clamps are used across a wide range of industries and applications, including automotive fuel lines, emissions systems, and coolant connections, beverage dispensing and food-grade fluid handling, medical and pharmaceutical tubing, HVAC condensate drains and refrigerant lines, small engine fuel systems, and industrial fluid transfer and pneumatic connections.

The low-profile design makes KSC clamps particularly well suited for applications with tight clearance requirements, such as under-hood automotive assemblies and compact equipment enclosures.

Installation

KSC mechanical pinch clamps are installed using Murray's industrial pinch clamp tools, which apply the precise closing force needed to compress the ears and achieve a secure seal. Proper tool selection and calibration ensure consistent clamping performance across production runs. Once installed, the clamp provides a permanent, tamper-resistant connection that does not loosen over time due to vibration or thermal cycling.

Specifications and Ordering

Murray manufactures the Keystone KSC series in a range of sizes to accommodate common small-diameter hose and tubing dimensions. Stainless steel construction is standard. Custom sizes and material options are available for specialized applications. Contact Murray Corporation or request a quote to discuss your Keystone KSC pinch clamp requirements.

Quality and Reliability

Every Keystone KSC clamp is manufactured under Murray Corporation's ISO 9001:2015 certified quality management system, ensuring consistent dimensions, material properties, and performance across every production lot. Our rigorous quality control means customers can rely on Murray for the consistency that high-volume OEM production lines demand. With manufacturing facilities in the United States, Canada, India, and China, Murray provides the global capacity and inventory depth to support both domestic and international supply requirements.

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