Our full-line American type constant torque hose clamps are designed to deliver stable, uniform sealing force across diverse tubing applications. With three bandwidth configurations and three material grades available, this series adapts seamlessly from light-duty general plumbing to heavy-duty high-pressure fluid systems, allowing you to match clamp specifications precisely to your working environment, pressure level and project budget.
Unlike ordinary worm drive clamps, the constant torque structure automatically compensates for hose thermal expansion, contraction and gradual gasket settlement, maintaining a tight, consistent seal over long service cycles without periodic re-tightening. The precision-machined worm screw mechanism enables smooth, incremental adjustment during installation, ensuring a secure fit without cutting or damaging the hose outer surface.
We offer three standard bandwidth profiles to match different hose diameters and load requirements:
12.7mm Bandwidth: The standard-duty, cost-effective option for small to medium diameter hoses. Ideal for automotive auxiliary lines, residential plumbing, agricultural irrigation and light industrial fluid transfer, delivering reliable clamping performance in low to medium pressure scenarios.
14.2mm Bandwidth: The medium-duty reinforced option, balancing clamping surface area and installation flexibility. Recommended for medium-pressure industrial pipelines, commercial HVAC systems and general equipment piping, providing upgraded holding force without excess material bulk.
15.8mm Bandwidth: The heavy-duty wide-band option engineered for large diameter hoses and high-torque, high-pressure conditions. The wider steel band distributes clamping force over a larger contact area, reducing hose damage risk and improving sealing reliability for hydraulic lines, heavy equipment and large-scale industrial piping.
All clamps are manufactured to strict dimensional and performance tolerances, with consistent torque behavior across each size and material grade.
| Range (mm) | Range (in) | Bandwidth (mm) | Material |
| 11-20 | 7/16"-25/32" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 13-23 | 1/2"-29/32" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 14-27 | 9/16"-1 1/16" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 18-32 | 11/16"-1 1/4" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 21-38 | 13/16"-1 1/2" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 21-44 | 13/16"-1 3/4" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 25-45 | 1"1/3/4" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 27-51 | 1 1/16"-2" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 32-54 | 1 1/4"-2 1/8" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 33-57 | 1 5/16"-2 1/4" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 40-64 | 1 9/16"-2 1/2" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 44-67 | 1 3/4"-2 5/8" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 46-70 | 1 13/16"-2 3/4" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 52-76 | 2 1/16"-3" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 57-79 | 2 1/4"-3 1/8" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 59-83 | 2 5/16"-3 1/4" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 65-89 | 2 9/16"-3 1/2" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 70-92 | 2 3/4"-3 5/8" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 71-95 | 2 13/16"-3 3/4" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 78-102 | 3 1/16"-4" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 83-105 | 3 1/4"-4 1/8" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 84-108 | 3 5/16"-4 1/4" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 90-114 | 3 9/16"-4 1/2" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 95-117 | 3 3/4"-4 5/8" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 103-127 | 4 1/16"-5" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 108-130 | 4 1/4"-5 1/8" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 117-140 | 4 5/8"-5 1/2" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 121-143 | 4 3/4"-5 5/8" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 130-152 | 5 1/8"-6" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 133-156 | 5 1/4"-6 1/8" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 141-165 | 5 9/16"-6 1/2" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 146-168 | 5 3/4"-6 5/8" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 157-178 | 6 3/16"-7" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 159-181 | 6 1/4"-7 1/8" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 171-194 | 6 3/4"-7 5/8" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 184-206 | 7 1/4"-8 1/8" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 197-219 | 7 3/4"-8 5/8" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
| 210-232 | 8 1/4"-9 1/8" | 12.7/14.2/15.8 | SS201/SS304/SS316 |
Our standard catalog covers 38+ diameter ranges with both metric and imperial markings for easy global cross-reference. All diameter sizes are compatible with each bandwidth and material option for flexible, mixed ordering.
To accommodate varying corrosion resistance needs and price points, this clamp series is available in three stainless steel formulations:
SS201 Stainless Steel: An economical grade for dry indoor environments and non-corrosive media. Suitable for general indoor drainage, signage mounting and low-demand applications with minimal moisture or chemical exposure.
SS304 Stainless Steel: The universal industrial grade with balanced corrosion resistance and mechanical strength. It performs reliably in outdoor atmospheric environments, water-based systems and mild chemical exposure, making it the standard choice for automotive, food processing auxiliary lines and most general industrial installations.
SS316 Stainless Steel: The premium corrosion-resistant grade with added molybdenum for enhanced resistance to saltwater, harsh chemicals and high-corrosion environments. It is the preferred option for marine equipment, chemical processing, pharmaceutical production and coastal outdoor applications.
360° Uniform Clamping: The constant torque structure applies even pressure around the full circumference of the hose, eliminating pressure gaps that cause leaks and preventing premature hose wear from localized stress points.
Vibration & Thermal Cycle Resistance: The self-compensating design retains consistent clamping force under continuous equipment vibration and temperature fluctuations, reducing maintenance needs for hard-to-access installations.
Smooth, Precise Installation: The precision-threaded worm screw delivers smooth, jamming-free adjustment for fine-tuned tightening, reducing assembly time and minimizing installation errors.
Flexible Specification Matching: Customers can freely combine bandwidth and material grades per project requirements, with no minimum order limit for standard catalog sizes.
This multi-spec constant torque clamp series serves a wide range of industries and installation cases:
Automotive: Air intake systems, coolant hoses, fuel auxiliary lines, exhaust system connections
Marine & Offshore: Ship piping systems, coastal equipment fluid lines, desalination plant piping
Industrial Manufacturing: Chemical transfer pipelines, process equipment connections, industrial drainage systems
HVAC & Refrigeration: Heating and cooling system hoses, chiller piping, ventilation duct connections
Food & Beverage: Processing equipment auxiliary lines, clean water piping (SS316 grade for sanitary zones)
Agriculture & Landscaping: Sprinkler system connections, agricultural equipment fluid lines, greenhouse piping
Infrastructure: Traffic signage mounting, street lighting pole fixation, outdoor billboard installation
Beyond our standard size catalog, we provide full customization services for non-standard project requirements:
Custom clamping diameters to fit unique hose outer dimensions
Special surface treatments and custom laser marking options
Custom packaging and private labeling for distribution partners
Dedicated bulk production with strict quality control for large-scale engineering projects
A: For hoses under 30mm diameter in light-duty use, 12.7mm bandwidth is usually sufficient. For 30–80mm hoses in medium pressure scenarios, 14.2mm is the recommended choice. For hoses over 80mm or high-pressure heavy-duty conditions, 15.8mm wide band clamps provide the best sealing and holding performance.
A: The core difference is corrosion resistance and cost. SS201 is the most economical for dry, low-corrosion indoor use. SS304 is the standard industrial grade for most outdoor and general industrial environments. SS316 offers the highest corrosion resistance, especially against saltwater and strong chemicals, making it suitable for marine and chemical processing scenarios.
A: Yes, all our standard clamps are marked with both millimeter and inch dimensions. Our size range spans 11mm to 232mm (7/16 inch to 9 1/8 inch), fully compatible with global hose sizing standards.
A: Yes, we support fully custom specifications for bulk orders, including non-standard bandwidths, mixed material components and special performance treatments. Contact our technical team with your project details for a tailored quotation.
A: Yes, the constant torque design is engineered to compensate for thermal expansion and contraction of hoses during temperature cycles, maintaining stable clamping force and preventing leaks caused by temperature fluctuations. For extreme high or low temperature scenarios, we can recommend the most suitable material grade.