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Screw Pipe Clamp (Hoffman Clamp)
Screw Pipe Clamp (Hoffman Clamp) (Product Code: SCI-338/136) is a screw-adjusted tubing clamp used to regulate or shut off the flow of liquid or gas through flexible tubing in chemistry and biology laboratory set-ups. Made of nickel-plated steel for 16 mm pipe, it has a hinged bottom bar, so it can be fitted or removed without reaching the tube ends. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Pipe (tubing) size | For 16 mm pipe |
| Adjustment | Screw |
| Material | Nickel-plated steel |
| Tubing protection | Projection plate stops the end of the screw from damaging the tubing |
| Bottom bar | Hinged, for direct fitting and removal without access to the ends of the tube |
| Product code | SCI-338/136 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is a Hoffman Clamp Used For?
A spring pinch clip such as the Mohr clamp is either open or closed, but a Hoffman clamp’s screw lets you set the flow gradually. That makes it the clamp of choice for metering gas from a generator, controlling water from a reservoir or aspirator bottle, or sealing a delivery tube in a gas collection apparatus between readings.
The projection plate sits between the screw tip and the tubing, so tightening presses the tube flat instead of letting the screw cut into it. With the hinged bottom bar, the clamp can be clipped onto tubing that is already connected in an assembled apparatus. Loosen the screw before storing tubing so the rubber does not take a permanent flattened set.
What to Specify When Ordering
- Your tubing size, to confirm it matches the 16 mm pipe this clamp is made for.
- How many clamps each apparatus or bench needs.
- Whether you also need rubber tubing or spring clamps in the same order.
OEM Manufacturer
These Hoffman screw clamps are manufactured by Jain Scientific Equipments Private Limited, which trades as ScienceLab, at its own licensed factory in Saha, Ambala, Haryana. As the OEM, the company supplies them directly to schools, colleges, research labs, dealers and importers, with no trader in between.
Need more clamps to match ones you already use, or replacements for a class set? The manufacturer handles repeat orders itself, so ask us. The ScienceLab company profile has more about the business.
Related Laboratory Equipment
Items used with a screw pipe clamp in flow-control set-ups:
- Rubber Tube (Laboratory) — the flexible tubing the clamp regulates.
- Elastic Clamps for Rubber Pipes (Mohr Clamp) — a spring clip for simple on/off closure.
- Tightening for Screw Pipes (Hoffman Clamp) — another Hoffman clamp listing; compare tubing sizes.
- Hoffman Screw Clip — a screw clip from the chemistry range.
- Rubber Tubing — additional tubing for gas and water lines.
Explore the full Laboratory Equipment category.
Frequently Asked Questions
What tubing size does the Hoffman clamp fit?
The Screw Pipe Clamp (Hoffman Clamp) is made for 16 mm pipe. If your tubing is a different size, tell us its diameter in your enquiry and we will advise whether this clamp or another listing suits it.
How is a Hoffman clamp different from a Mohr clamp?
The Screw Pipe Clamp (Hoffman Clamp) uses a screw, so flow can be reduced step by step or shut off completely. A Mohr clamp is a spring pinch clip that is simply open or closed, which suits quick on/off control but not fine adjustment.
Can it be fitted without disconnecting the tubing?
Yes. The Screw Pipe Clamp (Hoffman Clamp) has a hinged bottom bar, so it can be placed on or removed from tubing directly, without access to the ends of the tube, even when the apparatus is already assembled.
Will the screw damage the rubber tubing?
The Screw Pipe Clamp (Hoffman Clamp) has a projection plate between the screw and the tubing, which prevents the end of the screw from damaging the tube. Tighten only as far as needed and loosen it before storing tubing.
Who manufactures the Screw Pipe Clamp (Hoffman Clamp)?
The Screw Pipe Clamp (Hoffman Clamp) is manufactured by Jain Scientific Equipments Pvt Ltd, trading as ScienceLab, the OEM, at its own factory at Saha, Ambala, Haryana, India. Quotations are sent directly by the manufacturer.
What should I include in a quotation request?
For the Screw Pipe Clamp (Hoffman Clamp), include the quantity, the tubing size you use, the delivery city or country, and any other apparatus you want quoted together. Send it through the contact page or the enquiry cart.
Request a Quote
Request a price for the Screw Pipe Clamp (Hoffman Clamp), code SCI-338/136, via our contact page, or add it to the enquiry cart with your tubing and other chemistry lab equipment. Quotes come direct from the manufacturer.
Last updated: 24 September 2026
