18G 1-Inch Needle

$0.50 In stock

For research use only. Not for human or veterinary use.

One 18 gauge hypodermic needle, 1 inch long, sold on its own and fitted to a syringe by its hub.¹ A lower gauge number means a wider needle, so 18G is much wider than the 23G and 25G needles also listed here.² The supplier lists it for drawing up and mixing, not for injecting.

Specifications

Gauge	18 G (wider than 23 G or 25 G)²
Length	1 inch
Device type	Hypodermic single lumen needle, FDA Class II device (21 CFR 880.5570)¹
Fits	A syringe nozzle made to take a needle hub, such as a Luer lock tip⁵⁶
Supplier's stated use	Drawing up and mixing, not injecting
Use	Single use: one needle, one syringe, only one time⁸
Ships from	USA
Category	Peptide Supplies

Bulk and wholesale orders

Buying for a lab or for resale? Wholesale and bulk terms are confirmed on application.

Wholesale details Apply for a wholesale account

Guides and calculator

How to reconstitute a peptide vial
Reconstituting a lyophilized peptide step by step: the supplies, the diluent, the math and storage after mixing.
How subcutaneous injections are given
How prescribed subcutaneous injections are given: sites, rotation, sterile technique and sharps disposal, from clinical sources.
How to store peptides
How lyophilized and reconstituted peptides are stored: temperature, light, moisture and how long they keep, from manufacturer guidance.
Reconstitution calculator
Enter the peptide amount and the diluent volume and get the concentration per mL and per syringe unit. Shows the formula. For reference only.

What it is

A hypodermic needle is a metal tube sharpened at one end and joined at the other to a hub that fits a syringe. US rules class it as a Class II medical device.¹ This one is 18 gauge and 1 inch long, the widest of the three needle sizes we list, since a lower gauge number means a wider needle.²

The supplier does not name the brand. One comparable product, BD's 18G x 1 inch PrecisionGlide needle (catalog 305195), has a pink hub, a regular bevel and a thin wall, and is sold sterile for single use.³ FDA's device database lists that BD model as a prescription-use device cleared under premarket notification K021475.⁹

How it is used

FDA's record for the BD 18G needle describes single-use hypodermic needles as made to give or withdraw fluids, and notes they may also be used to prepare fluids or drugs.⁹ The supplier lists this needle for drawing up and mixing. In a lab, that means moving liquid in and out of a vial, such as adding diluent to a freeze-dried peptide; the reconstitution guide sets out those steps and the reconstitution calculator works out the resulting concentration.

The needle needs a syringe whose nozzle takes a needle hub.⁵ On a Luer lock tip, such as our 3mL Syringe, Luer-Lok Tip, the hub screws onto a threaded fitting that holds it securely but can be undone.⁶ Insulin syringes are different: they come with their own fine needle.² Peptide supplies explained shows which syringe and needle do which job.

Storage and disposal

A used needle goes straight into a sharps disposal container; once the container is about three-quarters full, your community's rules apply.¹⁰ FDA says never to bend or break a needle or take it off the syringe by hand, because that can cause needle sticks.¹¹ Loose needles never go in the household trash, the recycling bin or the toilet.¹² If someone is stuck by another person's used needle, FDA says to wash the area with soap and water or an antiseptic such as rubbing alcohol and get medical care right away.¹³ The storage guide covers how peptides are kept once mixed.

Frequently asked questions

Can you inject with an 18G needle?

The supplier lists this needle for drawing up and mixing, not for injecting. For comparison, CDC's vaccine guidance lists 22 to 25 gauge needles for intramuscular injection and 23 to 25 gauge needles, 5/8 inch long, for subcutaneous injection.⁴ At 18 gauge, this needle is wider than every needle in those ranges. How prescribed injections are given is covered in the injection guide.

What does 18G x 1 inch mean?

18G is the needle's gauge and 1 inch is its length. Gauge runs opposite to width: the higher the number, the thinner the needle.² So 18G is wide next to the 23G needle and the 25G needle, and far wider than the 31G needles preattached to some U-100 insulin syringes.²

Can I leave the needle in the vial between uses?

No. CDC advises against leaving a needle inserted in a vial's septum for repeated use.⁸ Its injection safety checklist calls for disinfecting the rubber stopper with alcohol before piercing it, and for a new needle and a new syringe every time a vial is entered, even for another draw from the same vial.⁷

Written by D2C Peptides Editorial Team.

Pending qualified review.

Updated October 25, 2026.