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Two different sizes of white PTFE reagent bottles.

White PTFE reagent bottles on a black background.

PTFE stirring component and bottle accessories.

PTFE wide-mouth reagent bottles with caps.

A full range of PTFE reagent bottles in various sizes.

19# PTFE stirring shaft sleeve with 7 mm guide hole, pack of 2 for stirrer bearing protection.

24# PTFE bushing with 7 mm guide bore, 2-piece pack for overhead stirrer adapters.

29# PTFE guide sleeve with 7 mm through hole, single piece for 29 mm joint stirrer.

34# PTFE bearing sleeve, 7 mm guide hole, single piece for 34 mm standard joint stirrer.

40# PTFE bushing with 7 mm guide aperture, single piece for 40 mm standard taper joint.

Features & Details

🛡️ 100% VIRGIN PTFE	Precision machined from solid virgin PTFE, completely impervious to boiling acids and aggressive reaction vapors.
🔬 #24 / #29 JOINT FIT	Standard ground taper joint fits snugly into multi-neck reaction vessels and distillation lids without grease.
⚙️ SELF-LUBRICATING BEARING	Low-friction PTFE sleeve guides 7mm / 8mm / 10mm glass and stainless steel stirrer shafts smoothly.
💨 VACUUM SEAL INTEGRITY	Internal fluoroelastomer O-ring seal maintains tight vacuum retention during reduced-pressure syntheses.

About this item

Product specification

Attribute

Product Specifications

Material & Structural Features

Material Construction

100% Pure PTFE (Polytetrafluoroethylene)

Sealing Mechanism

Internal Nested O-Ring with Adjustable Threaded Cap

Chemical Resistance

Absolute resistance to strong acids, alkalis, and organic solvents

Dimensions & Joint Specifications

19# and 24# Joints

19#: Height 48mm | Upper Dia 19mm | Lower Dia 16mm | Hole 7.5mm | Weight 23g

24#: Height 48mm | Upper Dia 24mm | Lower Dia 21mm | Hole 7.9mm | Weight 38g

29# and 34# Joints

29#: Height 48mm | Upper Dia 29mm | Lower Dia 27mm | Hole 7.9mm | Weight 57g

34#: Height 48.5mm | Upper Dia 34mm | Lower Dia 31mm | Hole 7.9mm | Weight 59g

40# Joint

40#: Height 53mm | Upper Dia 40mm | Lower Dia 37mm | Hole 7.9mm | Weight 127g

Thermostatic Incubation, Synthesis & Temperature Regulation

PTFE Stirring Shaft Sleeve, Standard Joint Stirrer Guide Adapter by Professional Series

Ensuring dependable accuracy during daily operations requires professional equipment engineered to withstand demanding laboratory and industrial environments. The PTFE Stirring Shaft Sleeve, Standard Joint Stirrer Guide Adapter by Xin Tester provides verified stability, user-friendly operation, and certified safety compliance across standard maintenance protocols. Discover our complete line of diagnostic and testing instruments in the Lab Stirring & Heating catalog.

Fast Heating & Pull-Down

High-power heating coils and efficient compressor chillers quickly achieve set-point temperatures, minimizing laboratory setup wait times.

Digital Dual LED Interface

Displays set-point and actual bath temperature simultaneously, backed by programmable timer countdowns for automated unattended runs.

💡

Thermostatic Insight: PID Duty Cycles & Fluid Convection

Smart PID controllers modulate electric power in proportional pulses, preventing temperature overshoot that could denature sensitive bio-enzymes or boil organic reaction mixtures.

Ordering & Model Verification

Select chamber volume, hole count, or temperature range from the dropdown menu in the right-side sticky purchase box.

Related technical collections:
Lab Water Bath & Oil Bath |
Lab Thermostatic Equipment

Use Cases

Acid & Corrosion Resistant Chemical Synthesis

FAQs

Q1: How does the adjustable O-ring seal work?

A1: The top of the PTFE sleeve features a threaded cap. By twisting this cap, you compress the internal O-ring. Tightening it grips the stirring rod more firmly to create a robust airtight/vacuum seal, while loosening it reduces friction for smoother high-speed rotation.

Q2: Is PTFE better than a standard glass or rubber stopper?

A2: Yes, significantly better. Standard rubber stoppers degrade and melt when exposed to strong organic solvents, contaminating your sample. Glass stoppers create too much friction against a rotating glass rod, leading to shattering. Pure PTFE (Teflon) offers the ultimate combination of absolute chemical inertness and self-lubricating low friction.

Q3: Can I use this stirring sleeve in a vacuum distillation setup?

A3: Absolutely. When properly lubricated and tightened, the internal nested O-ring creates a highly dependable hermetic seal. This effectively prevents ambient air from leaking into the flask, maintaining the stable negative pressure required for vacuum distillation.

Q4: How do I know which joint size to buy?

A4: The joint size (e.g., 24#, 29#) corresponds directly to the standard taper ground glass joints on your reaction flasks. Simply check the markings etched on the neck of your glassware (such as 24/40 or 29/42), and purchase the PTFE sleeve with the matching number.

PTFE Stirring Shaft Sleeve, Standard Joint Stirrer Guide Adapter by Xin Tester

Price range: $7.99 through $13.99

Extra 5% Off with code: welcome5

Size

Clear

6–12 Month Warranty

Repair & Refund support available for most products.

Free Worldwide Shipping

Ships within 3 business days.

Taxes & Duties

Buyer responsible for local import fees.

24/7 After-Sales Support

Technical assistance & video guidance within 24h.