- Physics Lab Equipment
- Chemistry Lab Equipment
- Biology Lab Equipment
- Anatomical Lab Equipment
- Learning
- Educational Lab Equipment
- Magnets
- Agriculture
- Astronomy
- Earth Science
- Geography Lab Equipment
- Safety Lab Coat
- Laboratory
- Meteorological
- Electricity & Magnetism
- Heat
- School Lab Equipment
- Lab Glassware
- Science Lab Equipment
- Tvet Lab Equipment
- Robotics Kits Supplier and Manufacturer for Schools India
- Math Lab Equipment Manufacturers and Exporters in Ambala
- STEM Kits Manufacturers and Supplier India
- Engineering Lab Equipment
- Hospital Lab Equipment
- Water, Sanitation & Hygiene Supplies
- Cold Chain, Solar & Communication Equipment
- Nutrition
42.jpg)
Tightening for Screw Pipes (Hoffman Clamp)
Tightening for Screw Pipes (Hoffman Clamp) (Product Code: SCI-692/034) is a screw-operated tubing clamp used to squeeze rubber tubing gradually and set a controlled flow of liquid or gas in chemistry lab apparatus across India. Made of nickel-plated steel for 12 mm tubing, it has a projection plate that protects the tube from the screw end and a hinged bottom bar so it can be fitted or removed mid-tube. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Type | Hoffman screw clamp |
| Tubing size | For 12 mm pipe (tubing) |
| Material | Nickel-plated steel |
| Operation | Screw tightening |
| Tube protection | Projection plate prevents damage to the tubing by the end of the screw |
| Bottom bar | Hinged, for direct fitting and removal without access to the tube ends |
| Product code | SCI-692/034 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Hoffman Clamp Used For?
Where a Mohr clamp is simply open or shut, the Hoffman clamp can be set anywhere in between. Turning the screw squeezes the tubing a little at a time, so students can set a slow, steady drip from a reservoir, adjust the cooling water running through the condenser of distillation apparatus in India's college labs, or throttle gas from a generator to an even stream. Because the bottom bar is hinged, the clamp can be added to an assembled line without disconnecting either end of the tube.
To fit it, swing the bottom bar open, lay the tubing across, close the bar and turn the screw slowly until the flow is right. The projection plate spreads the pressure so that the screw end does not bite into the rubber. Loosen the clamp at the end of the session so the tubing recovers its shape, and wipe the nickel-plated surface clean of any spills.
What to Specify When Ordering
- Tubing size: this clamp is listed for 12 mm pipe; ask us about other sizes.
- The number of clamps needed per apparatus or per bench.
- Whether rubber tubing or spring (Mohr) clamps should be quoted too.
OEM Manufacturer
ScienceLab is the trade name of Jain Scientific Equipments Private Limited, the OEM that manufactures this Hoffman clamp at its own licensed factory in Saha, Ambala, Haryana, India. Schools, colleges, dealers and importers are supplied factory-direct, and repeat orders or additional clamps are arranged with the manufacturer itself — ask us. Institutional buyers completing vendor forms can use the company's GSTIN 06AAECJ8618A1ZT and LEI 3358004HRD1JIVXKYX49. Read more on the ScienceLab company profile.
Related Laboratory Equipment
These items are used with a screw clamp when building or controlling tubing lines:
- Screw Pipe Clamp (Hoffman Clamp) — another Hoffman screw clamp listing, for a different tubing size.
- Elastic Clamps for Rubber Pipes (Mohr Clamp) — a spring clamp for simple on-off control.
- Rubber Tube (Laboratory) — tubing to regulate with the clamp.
- Hoffman Screw Clip — a screw clip in the Chemistry Lab Equipment range.
See more clamps and fittings in the Laboratory Equipment category.
Frequently Asked Questions
What tubing size is the Hoffman clamp for?
Tightening for Screw Pipes (Hoffman Clamp) is listed for 12 mm pipe (tubing). If your apparatus uses a different tubing size, tell us its outer diameter through the contact page so we can suggest a suitable clamp before you order.
Why does it have a hinged bottom bar?
The hinged bottom bar on Tightening for Screw Pipes (Hoffman Clamp) swings open, so the clamp can be placed on or taken off rubber tubing without disconnecting either end of the tube. This saves dismantling a distillation or gas set-up that is already assembled.
Will the screw damage the tubing?
No. Tightening for Screw Pipes (Hoffman Clamp) has a projection plate between the screw end and the tubing, so the screw presses on the plate rather than cutting into the rubber. Tighten gradually and loosen the clamp after use to extend tubing life.
Who manufactures this Hoffman clamp?
Tightening for Screw Pipes (Hoffman Clamp) is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), the OEM, at its licensed factory at Saha, Ambala, Haryana, India. Laboratories, dealers and importers buy it factory-direct, with quotations issued by the manufacturer rather than an agent.
How does it differ from a Mohr clamp?
Tightening for Screw Pipes (Hoffman Clamp) squeezes tubing by degrees as its screw turns, giving a steady partial flow, whereas a Mohr clamp is a quick on-off spring pinch. Many labs keep both: Hoffman clamps for fine control and Mohr clamps for fast shut-off.
What is it made of and how is it cleaned?
Tightening for Screw Pipes (Hoffman Clamp) is made of nickel-plated steel. Wipe off chemical spills promptly with a damp cloth and keep the screw thread clean and dry so that it turns smoothly each time the flow is adjusted.
Request a Quote
For a quotation on Tightening for Screw Pipes (Hoffman Clamp), send the quantity and tubing size through the contact page or add the clamp to the enquiry cart; the manufacturer replies directly.
Last updated: 24 September 2026
