An ISO aluminum vacuum chain clamp achieves uniform sealing on large-diameter vacuum flanges through a segmented chain structure that wraps around the flange circumference and applies even force distribution. Available in KF16-50 and ISO63-400 sizes, the chain clamp uses a single screw mechanism to simultaneously compress all chain segments. For KF and ISO flanges, these clamps serve as quick-release fasteners in medium and high vacuum applications. The single-bolt design eliminates multiple clamping points, enabling direct operation in tight installation spaces. The kf 16 clamp handles NW16 connections, while the kf 25 clamp serves NW25 flanges.

Chain Mechanism and Force Distribution

The iso clamp employs a segmented chain of aluminum links. When the tightening screw is actuated, the chain segments apply radial force, compressing the seal uniformly across the flange face. This distributed compression eliminates localised stress points common in hinged clamps. The segmented design conforms precisely to the circular flange profile, preventing seal extrusion and maintaining vacuum integrity.

Key features of the iso k clamp design:

🔗 Segmented chain for circumferential compression
⚙️ Single-bolt mechanism reduces installation time
📐 Conforms to flange profile without localised stress
🔧 Supports elastomer and metal sealing systems

Vacuum Compatibility and Standards

ISO chain clamps comply with ISO 2861 and DIN 28404 for vacuum flanges. Available in KF (16-50mm) and ISO (63-400mm) standards. The clamp provides leak-tight sealing up to 1×10⁻⁸ Torr with elastomer O-rings or 1×10⁻¹⁰ Torr with metal seals. These clamps are interchangeable with components from other manufacturers following ISO-KF and ISO-K standards.

Material and Construction

The clamp is manufactured from pressure die-cast aluminum alloy, offering mechanical strength and lightweight construction. Stainless steel pins in the chain links provide wear resistance. Chain links are shaped to provide axial and radial force components, centring the connection while providing sealing pressure.

Parameter	Specification
Material	Aluminum (die-cast)
Connection	Clamp (vacuum)
Size Range	KF16-50 / ISO63-400
Standards	ISO, KF
Seal Compatibility	Elastomer O-ring, Metal seal

Installation and Operation

The kf clamp requires inserting the O-ring and centring ring between the two flange faces. The chain clamp is then wrapped around the flange perimeter, and the single screw is tightened. Proper tightening torque ensures the required sealing force without over-compressing the O-ring.

The kf clamp design allows quick assembly and disassembly without specialised tools. The single-bolt actuation makes these clamps suitable for systems requiring frequent maintenance.

Installation steps:

Insert O-ring and centring ring between flange faces
Wrap chain clamp around flange perimeter
Tighten single screw to required torque
Verify uniform force distribution around circumference

The iso clamp supports both elastomer and metal seal configurations for diverse vacuum requirements. The kf clamp series offers quick-release convenience for small to medium systems, while larger ISO sizes serve industrial vacuum applications. The kf 16 clamp and kf 25 clamp are common choices for standard KF flanges. For the iso k clamp, proper torque application ensures leak-tight performance across the full size range. The kf clamp series remains a standard solution for quick-connect vacuum systems, and the iso clamp is specified for larger industrial vacuum connections where uniform compression is required.