Adapters Cone (stem To Rubber Tubing)

Adapters Cone (Stem to Rubber Tubing), also known as right-angle or straight connection adapters, are essential laboratory glass components designed to transition from a standard ground glass joint to flexible rubber or silicone tubing. Manufactured from premium borosilicate glass, these adapters ensure airtight, leak-proof connections for safe gas or liquid transfer in complex laboratory assemblies.

Featuring a precision-ground outer cone (male joint) on one end and a serrated or tapered glass stem on the other, these adapters allow seamless interfacing between rigid glassware setups and flexible lines. The robust design provides exceptional resistance to thermal shock and aggressive chemicals, making them ideal for distillation, vacuum extraction, and gas purging systems.

Key Features

• Fabricated from high-purity borosilicate 3.3 glass for superior chemical and thermal durability
  
• Precision-ground joint cones compliant with standard international taper ratios for leak-free performance
  
• Serrated or ribbed hose connection stem to ensure a secure, slip-resistant grip on rubber or silicone tubing
  
• Heavy-wall construction to minimize structural stress and resist breakage during handling and assembly
  
• Available in various standard joint sizes (e.g., 14/23, 19/26, 24/29, 29/32) and configurations (straight or 90° bend)
• ernational Standards

Our laboratory glassware adapters are manufactured to meet exact engineering tolerances, aligning perfectly with standard global laboratory specifications for hassle-free integration and international export:

• ISO 383 – Laboratory Glassware – Interchangeable Conical Ground Joints
  
• DIN 12257 – Laboratory Glassware – Connectors with Conical Joints
  
• ASTM E438 – Standard Specification for Glasses in Laboratory Apparatus
• Custom stem lengths, variable hose connection diameters, and specialized joint sizes can be customized and manufactured to meet precise bulk procurement or OEM client requirements.

Applications

Widely utilized in synthetic chemistry setups, vacuum filtration lines, gas introduction/purging systems, distillation apparatus, organic chemistry research labs, and industrial pilot plants requiring flexible-to-rigid line connections.

Why Choose Our Products

• Export-grade finish featuring highly uniform, fine-ground surfaces to ensure a vacuum-tight seal
  
• Thoroughly annealed glass construction to eliminate internal mechanical stress
  
• Serrated stem profiles optimized for standard industrial rubber and silicone laboratory hose sizes
  
• Trusted manufacturing partner for global laboratory equipment distributors and B2B scientific suppliers