Keck Spherical Joint Clamp (Pinch Clamp) S/S - No.18

Stainless Steel Spherical Joint Pinch Clamps (Sizes 12# – 50#). The essential locking system for leak-free, high-pressure glass ball-and-socket connections.

The Spherical Joint Pinch Clamps (also known as ball-type interface clamps) are engineered to securely lock and stabilize standard glass ball-and-socket joints and O-ring fittings. Forged from industrial stainless steel, these clamps distribute uniform pressure across spherical glassware interfaces. They prevent fluid leaks, system pressure drops, and structural decoupling during demanding chemical synthesis, distillation, and reflux setups.

Please note this range is not 304 (18/8) Stainless Steel.

Comprehensive Sizing Fleet & Specifications

This product lineup features five standardized size classifications meticulously engineered to match the standard ball diameters of laboratory glassware:

• 12# Clamp: Optimized for small-scale glassware featuring a #12 ball joint interface (e.g., 12/2 or 12/5 joints). Built with a standard spring tension grip.
• 18# Clamp: Designed for mid-small apparatus featuring a #18 ball joint interface (e.g., 18/7 or 18/9 joints). Built with a standard spring tension grip.
• 28# Clamp: The industry standard for mainstream chemistry setups featuring a #28 ball joint interface (e.g., 28/12 or 28/15 joints). Includes a high-security locking screw.
• 35# Clamp: Heavy-duty variant for high-volume distillations featuring a #35 ball joint interface (e.g., 35/20 or 35/25 joints). Includes an integrated locking screw mechanism.
• 50# Clamp: Maximum capacity oversized profile for industrial glass plants and massive pilot reactors featuring a #50 ball joint interface. Includes a reinforced heavy-duty locking screw.

Key Product Features

• Stainless Steel: Offering good resistance against harsh laboratory acid vapors, solvents, and accidental chemical splashes. (not 304 (18/8) Stainless Steel).
• Advanced Screw-Type Locking Nut: Sizes 28#, 35#, and 50# feature a precise setting screw locking mechanism. This allows lab technicians to apply customizable, adjustable, and micro-tightened clamping force that will not slip under high-vibration environments.
• Glass-Safe Pressure Distribution: Structurally contoured dual fork arms encircle the outer lip of the glass joint evenly. This design ensures a robust gas-tight and liquid-tight seal without introducing micro-stress points that can crush or crack expensive laboratory glassware.
• High Thermal Tolerance: Capable of enduring the intense temperature variations required for continuous boiling, high-vacuum distillations, and cold-trap condensations.
• Product of China

Recommended Applications

• Securing the flexible connections between distillation flasks, fractionating columns, and receivers where rigid ground-glass joints are prone to snapping.
• Linking gas-delivery lines and vacuum manifolds in organic chemistry research and university physics labs.
• Maintaining rock-solid glass seals in rotary evaporators and complex environmental sampling extraction trees.