When purchasing a trigger sprayer, do you often find yourself confused about the screw thread? Technical terminology often refers to sizes like 28/400, 28/410, and 28/415. Choosing the wrong size can result in a leaky, unsaleable product.
Let me share my experience with you on how to correctly measure the screw thread for the bottle and choose the right straw length. This way, you can make the right choice every time, ensuring a secure installation and a flawless user experience for your customers.
What do 28/400, 28/410 and 28/415 really mean?
- First digit (for example, “28”):This is the outer diameter of the screw mouth in millimeters (mm)
- Second number (for example, “400” , “410”or”415″):This number represents the thread style. This is the key difference, defining the height of the bottle neck and the number of turns of the thread.
One picture to understand the difference
How to measure the size of the screw?
Using a tool called a caliper, you can determine the size of the bottle’s finish.
Measure the “T” dimension (outside diameter)
This is the diameter measured at the very top of the threads. For a 28mm bottle finish, this should be slightly less than 28mm (27.27mm – 27.89mm is fine).
Measure the “H” dimension (neck height)
Measure the distance from the bottom of the gasket to the bottom of the neck,If you measure closer to 17mm, your bottle is a 400 gauge. If it’s closer to 20.5mm, it’s a 410 gauge.
Friendly Tips：It is best to get the actual sample and match it with the bottle for the final match, so as to be foolproof and reduce the error rate.
What happens if the Trigger Sprayer doesn’t fit the bottle?
1.Leakage：If the size of the selected closure is shorter than the bottle mouth, there will be a certain gap between the bottle mouth and the closure, which will cause leakage during transportation, shelving and customer use.
2.Thread Slip：Because the trigger sprayer cannot be fully tightened, the plastic threads can wear or “jump” when tightening. This is called “slipping.” The cap will feel loose and will not lock properly, often falling off with the slightest force.
How to measure and define the length of a tube?
Our tube length is divided into:net tube length and tube length from gasket.
- net tube length:It is the length of the tube itself. It is the length of the tube.
- tube length from gasket：The distance from the gasket to the bottom of the tube is measured
We recommend that the hose be cut with an angled cut (V-Cut) because the angled tip can prevent the tube from forming suction with the flat bottom of the bottle and causing blockage.
How do we ensure the perfect match for our clients?
Technical Consultation: Our technical experts will review your bottle specifications or drawings. If you’re unsure, you can send us your bottle or we’ll send you free samples for matching.
Free Sample Testing: Before placing a mass production order, we provide free samples so you can test the fit and function on your actual bottle.
Precise Measurements: We’ll precisely measure your bottle and calculate the exact straw length required for optimal function, completing the process with a professional bevel cut.
Clear Communication: Before production begins, we confirm all specifications on the technical drawing, including bottle finish and straw length, to ensure flawless production.
We currently have many styles of Trigger Sprayers that you can browse and view.
