What is a luer-lock syringe?

The two ways a needle attaches. Luer-lock screws on with a thread and won't pop off under pressure; luer-slip just pushes on. Filters and adapters are made for luer-lock.

Why it matters when you shop

The luer taper is the standard fit between a syringe tip and a needle. Luer-lock adds a threaded collar so the needle screws on and cannot pop off; luer-slip is friction only. For mixing, filtering and filling spray bottles, where you push liquid through a small hub, luer-lock is the one that stays on.

What to look for on the listing

  • "Luer-lock" (or "LL") in the title for anything used with a filter or a blunt drawing needle.
  • Whether a needle is included; luer syringes usually ship without one.
  • Capacity: 3 mL for moving water into a vial, 10 mL for larger mixes.

Go deeper

Products with this specification

Insulin Syringes 31G, 0.5 mL Needle connection: Fixed needleInsulin Syringes 31G, 0.3 mL Needle connection: Fixed needleInsulin Syringes 30G, 1 mL Needle connection: Fixed needleHalf-Unit Insulin Syringes, 0.3 mL Needle connection: Fixed needleLuer-Lock Syringes, 3 mL Needle connection: Luer-lock10 mL Luer-Lock Syringes Needle connection: Luer-lockBlunt Fill Needles, 18G Needle connection: Luer-lockLuer Needle Tips, 27G Needle connection: Luer-lock

Last edited . Equipment only: nothing on this page is advice about what to inject, how much, or whether a product is fit to use. That comes from the product's labelling and whoever supplied it. Product pages link to your own country's Amazon store through affiliate links; your price is the same.