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Hoffman Screw Clip
Hoffman Screw Clip (Product Code: SLE/CH/92) is a screw-adjusted clamp that squeezes flexible tubing to slow, meter or completely stop the flow of a liquid or gas. Unlike a spring pinch clip, which is either open or shut, the screw lets you set a partial restriction and leave it there, which makes it useful on gas-delivery lines, siphons and reservoir outlets in teaching laboratories. Chemistry teachers, lab technicians and students in schools and colleges rely on it whenever a set-up needs steady, hands-free flow control. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, as part of its school chemistry lab equipment in India.
Specifications
| Parameter | Detail |
|---|---|
| Type | Hoffman-pattern screw clip for flexible tubing |
| Construction | Screwed, with hinged side bar |
| Material | Copper, iron |
| Finish | Plated metal / plated brass |
| Tubing size | For use with tubes up to 20 mm outer diameter |
Typical Use
The hinged side bar swings aside so the clip can be placed around a length of tubing that is already connected at both ends, then closed and locked by the screw. Turning the screw presses the tube flat in small steps: a gas stream from a generator can be slowed to a countable bubble rate, the drip from a reservoir set to a chosen speed, or a line sealed completely so reagent is held back between stages of an experiment.
Before ordering, check that your tubing is no more than 20 mm across the outside. Avoid overtightening thin-walled tubing, which can split or take a permanent crease, and back the screw off when apparatus is put away so the tube recovers its round shape. Buyers sourcing from a chemistry lab instruments supplier often order these clips together with matching rubber tubing so every bench has a ready flow-control set.
Manufacturer
This clip is produced by Jain Scientific Equipments Private Limited, which trades under the brand ScienceLab from Ambala, Haryana, India, and supplies laboratory apparatus to schools, colleges and distributors. Learn more about the company in our company profile.
Related Chemistry Lab Equipment
Items usually ordered for the same tubing and flow-control set-ups:
- Rubber Tubing — flexible tubing for the clip to regulate; confirm the outer diameter is within 20 mm
- Vacuum Tubing — thick-walled tubing for suction lines that may also need a shut-off point
- Borosilicate Glass Tubing — glass delivery tubes joined to the flexible sections the clip controls
- Pinch Clip — spring clip for simple open-or-shut control where no fine adjustment is needed
- Hoffman Clips — another Hoffman-type clip in our range to compare before ordering
See the complete Chemistry Lab Equipment range for stands, clamps and other bench apparatus.
Frequently Asked Questions
What tubing size does the Hoffman Screw Clip accept?
It is made for tubes up to 20 mm outer diameter. If your tubing is close to that limit or unusually thick-walled, send us its dimensions through our contact page before ordering.
How is it different from a pinch clip?
A screw clip holds any setting between fully open and fully closed, so it can meter flow; a spring pinch clip only opens or shuts the tube.
Can I fit it without disconnecting my apparatus?
Yes. The hinged side bar opens so the clip can be placed around tubing mid-line, then closed and tightened.
What metal is it made from?
Copper and iron are listed for this clip, with a plated metal or plated brass finish. If you need a particular finish for a tender, mention it in your enquiry and we will confirm what is available.
Should it be used as the shut-off on a fuel gas line?
No. Use it to regulate flow within experimental set-ups; always close the gas tap or burner valve to shut off a fuel gas supply.
What warranty applies?
Warranty terms are not listed on this page; please ask through our contact page and we will confirm them with your quotation.
Do you supply in bulk to institutions and overseas buyers?
Yes. We supply schools, colleges and distributors across India and international markets; include the quantity, delivery location and your tubing size so we can quote accurately.
Request a Quote
Add the Hoffman Screw Clip to our enquiry cart or contact us with the quantity you need for a quotation.
Last updated: 24 September 2026
