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Luer Slip Syringe vs. Luer Lock Syringe

luer lock and luer slip

The luer slip syringe necessitates medical staff to push the hypodermic needle onto the syringe end, forming a secure and robust connection. In contrast, luer lock syringes demand the hypodermic needle to be twisted on, creating a secure bond by rotating the needle clockwise.


In the light of their changing needs, the designs and models of syringes and needles have been modified and diversified.

different of syringes
Different types of syringes

Today, a wide variety of these instruments are available, and are in use in medical fields and laboratories.

types of syringe tips
Types of syringe tips

Among these are the Luer Slip syringes and the Luer Lock syringes.

luer slip and luer lock syringe
Luer slip syringe& Luer lock syringe

There are two key points to focus on when deciding to get either a Luer Slip or a Luer Lock syringe:

  • The main difference between the two types of syringes.
  • The purpose of purchase.

Once these two factors are decided, you can buy the perfect syringe you need.

This article will shed light on both these topics to give you a vivid understanding of these two syringe types and help you in making the correct decision according to your need.

Introduction to Luer Fitting

Let’s first take a look at what Luer is.

The Luer fitting can be best described as a system used as a standard for tapered tip when it comes to fluid fittings of a small scale such as in syringes.

luer fitting
Luer fitting

The purpose of these fittings is to ensure that the connection between any two specific parts is leak-proof.

Syringes being a very common instrument in use in medical tasks and laboratory works are a common host of these connections.

The part of the syringe where the blade locks to the body of the syringe comes in various designs.

Types of syringes
Types of syringes

Similarly, there are needles of various types for the variety of tips available as well.

Types of needles
Types of needles

Based on the different types of professional work at hand, there are multiple combinations of tips and needles available.

For instance, hypodermic needles are used with syringes when a liquid has to be injected or removed from the body.

plastic syringe

In these situations, the chances of air getting into the blood vessel can be quite hazardous.

In some cases, the syringes need to be reused such as by diabetic patients. Even though the same person is using the syringe in this case, the bacteria from the skin can reach the bloodstream and cause problems.

insulin syirnge
Insulin syringes

In a medical setup, only the practice of one-time use of such disposable equipment is promoted. Single-use equipment, like syringes and needles, is an effective player in reducing risks associated with cross-contamination.

Syringes are known to be the most common instruments to use the Luer fitting system. In this system, the needle either tightly fits on the top or screws into it.

luer lock & luer slip
Luer lock & Luer slip

Based on these types of connections the syringes are classified into two categories: Luer lock syringes and Luer slip syringes.

Luer Slip vs Luer Lock Syringe:

The image below shows these two types of syringes. On the left is a sterile 2.5 ml Luer Slip Tip. On the right is a sterile 3 ml Luer Lock Tip.

Luer slip syringe& Luer lock syringe
Luer slip syringe& Luer lock syringe

Difference in Appearance

The Luer Slip syringes have a smooth spigot and there is complete absence of any type of collar.The Luer Lock syringes have a locking collar which demands the hypodermic needle to be twisted on, creating a secure bond by rotating the needle clockwise.

Difference in Fitting Mechanism

The Luer Slip Tip comes with a friction-fit connection. The syringe tip is ‘slipped’ or pushed into the needle hub, resulting in a secure connection as shown in the image below.With the Luer Lock Tip the hypodermic needle is screwed into the tip by rotating it clockwise and ‘locked’ in place. This connection results in acquiring a securely tight bond between the two components.

The term male Luer fitting is used for the lock with internal threads in the external housing and ‘female Luer fitting’ is used for the one with external threads at the base of the taper.

Note: If it says on the syringe needle packing that it has the Luer Lock Fitting, both types of syringe tips i.e., The Luer Slip Tips and The Luer Lock Tips, can be used with those needles.

Difference in Uses

Luer Slip syringes 
Measurement of liquids used for dilution/mixtures.
Luer Lock syringes 
are Ideal equipment for septum puncturing in samples with air-sensitivity.
For measuring and removing cuts (dose reduction).Minimize the possibility of scratches
Suitable for washing tubes of small volume.
Difference in Uses of Luer slip and Luer lock syringes

The size of the needle depends upon the target amount of liquid that will be used to make the dilution and the size (in mL) of the cut that will be made in dilution.

Which to Choose: Luer Slip Syringe or Luer Lock Syringe?

Today, the main goal of designing medical equipment is to find that fine line between effectiveness and functionality. The effectiveness of equipment considering its designated job is just as important as its functionality for the individual using the equipment.

The following analysis will help you in making the right selection.

Note: The staff using the syringes may have other preferences for particular tasks based on personal experience and comfort.

Luer Slip SyringesLuer Lock Syringes
No locking mechanism.A firm and secure locking mechanism.
Useful for any task where one fluid needs to be filled in multiple adaptors.Useful for any task where securing the needle is essential.
Easy and quick needle change. (Simple insertion of needle into the syringe.Takes a few seconds to change the needle.
Quick to fit.Takes a moment to screw the needle on the tip.
Most refillable cartridges are compatible with Luer Slip Tips.Suitable with pyrophoric needles.
Cartridge priming, flushing/purgingMost reliable for venous lines or ports to arteriolar lines.
The needle is kept in place by friction. Oil/grease on the needle can loosen the connection of needle and tip.The screw thread locks the needle in position firmly. Needle will face greater resistance for detachment.
Under high pressure, the Luer joint can burst apart when used with syringe filter.This connection can withstand high pressure. In case of risk of joint bursting, Luer Lock syringes should be used.

Company Introduction

Liaoning KANGYI Medical Equipment Co., Ltd was founded in 1994 and is one of the leading manufacturers of IV sets, syringes, and medical parts in China. Quality is our highest priority, and our quality assurance system is certified and meets the standards of the Chinese National Medical Products Administration, ISO 13485, and the European Union’s CE mark.

We produce over 600 million pieces per year. Our products are sold across China and exported worldwide, to destinations including Europe, South America, Russia, Africa, and the Middle East.

Our company employs over 300 staff, including 50 people working in engineering and technical management. Our premises occupy an area of 20,000 square meters, with a construction area of 15,000 square meters. This space includes a 100,000-class purification workshop that occupies 8,000 square meters.

If you want to know more about us and talk face to face, we welcome you to visit our booth in CMEF Shanghai and Hospitalar in Brazil.

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