Design And Application Of Kf Double-pin Vacuum Clamps

For semiconductor vacuum lines, specify KF double-pin clamps (KF16, KF25, KF40) to prevent micro-leaks that cause wafer defects. These clamps, fabricated from SS304, deliver 360° uniform compression on KF flanges, maintaining vacuum integrity to 1×10⁻⁸ Torr. The bolted wing nut enables tool‑free assembly, reducing particle contamination. Available in sizes 1/2″–2″ (F10–F50) with pressure rating 0‑10bar, these clamps meet 3A, DIN, and SMS standards. Select KF clamps for process chambers, pump lines, and gas panels. Install with fresh O‑rings and centering rings. Perform leak checks after assembly.

Micro-Leak Costs in Semiconductor Manufacturing

Leaks introduce moisture and airborne contaminants, disrupting plasma stability. Even micro-leaks cause pressure drift, extended pump‑down times, and fluctuating base pressures. Thermal cycling loosens standard clamps, creating gaps at flange interfaces.

Semiconductor process risks:

• Pressure instability – inconsistent plasma behavior.

• Contamination ingress – moisture causing defects.

• Extended cycle times – reduced throughput.

• Yield loss – faulty film quality.

The kf25 clamp and other sizes maintain seal force across thermal cycles. The kf 25 clamp is commonly installed on process chambers and load locks. The kf40 clamp suits high‑conductance pump lines.

Design and Specifications

The KF clamp consists of two hinged halves, a threaded stud, and a wing nut. The double‑pin design applies even pressure around the flange circumference. Reinforced hinges resist vibration loosening.

Technical specifications:

• Material: SS304

• Connection: Clamp (double‑pin hinged)

• Size range: 1/2″ – 2″ (F10 – F50)

• Pressure rating: 0 – 10 bar

• Standards: 3A, DIN, SMS

• Vacuum rating: 1×10⁻⁸ Torr (elastomer seals)

• Temperature: -50°C to 200°C (FKM O‑rings)

The kf 16 clamp suits smaller gas lines and instrumentation ports. The SS304 construction provides corrosion resistance for standard semiconductor process gases and cleaning agents.

Semiconductor Applications

KF clamps are used where frequent disassembly is required for maintenance or component changes.

Typical connections:

• Process chamber pump lines

• Load lock and transfer chambers

• Gas delivery manifolds

• Turbo pump and cryo pump installations

• Vacuum gauge ports

These clamps are standard for ISO‑KF flange connections (DN10‑DN50). The kf clamp and flange combination assembles without tools, reducing particle contamination. Compliance with 3A, DIN, and SMS standards ensures interchangeability with existing vacuum components.

Installation Procedure

Installation involves placing the clamp over two KF flanges with a centering ring and O‑ring between them. The 1/2″–2″ size range covers common vacuum line diameters.

Installation steps:

1. Inspect flange faces for scratches or debris.

2. Install centering ring with fresh O‑ring.

3. Position clamp over flange lips.

4. Tighten wing nut to recommended torque.

5. Perform leak check after assembly.

Specification Table

Why Specify KF Double‑Pin Clamps

1. Provides uniform seal compression for leak‑tight connections.

2. Enables tool‑free assembly, reducing particulate contamination.

3. Offers SS304 construction with 0‑10bar pressure rating.

4. Maintains seal integrity through thermal cycling.

5. Supports rapid component changes in production environments.

The KF double‑pin clamp is a solution for semiconductor manufacturing requiring reliable vacuum connections. The kf25 clamp and kf40 clamp are specified for process chambers and pump lines. The kf 16 clamp suits smaller gas lines. These clamps prevent leaks that cause yield loss, enabling consistent process performance. Compliance with 3A, DIN, and SMS standards ensures compatibility with existing vacuum systems across the 1/2″–2″ size range.

KF Double Pin Vacuum Clamp

The KF Hardware (also known as NW) assembly consists of two flanges, a center ring and an SS304 clamp. The quick clamp is assembled with a wing nut, ensuring easy tool-less use for long-term use. Applying even pressure on the clamp ensures a vacuum seal. The mating flange surface compresses the O-ring, which is held in place by a metal centering ring to create a vacuum seal.

Product Description

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