T-bolt clamp
A T-bolt clamp tightens the hose with a bolt that draws together two trunnions fixed at the ends of the band. Its band, 18 to 26 mm wide on the ACE data sheet, makes it suited to high clamping forces: reinforced hoses, couplers, large diameters.
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Three stainless steel ranges are available, from 17 to 445 mm:
- ACE W4, with band, bolt, trunnions and bridge in 18/8 (AISI 304) stainless steel according to the data sheet, from 17 to 252 mm, and a Magnum W4 model from 430 to 445 mm;
- Norma GBS W4, from 29 to 330 mm;
- Mikalor Supra W5, in 316 stainless steel, from 226 to 408 mm.
The ACE data sheet recommends it for all corrosive environments, including marine, irrigation, pumping, food and chemical use, and advises tightening firmly; where needed, it recommends two clamps side by side, heads reversed, at each end.
How to choose: measure the outside diameter of the hose fitted on its tail and take the range that covers it. The W classes are those of DIN 3017: on the Norma data sheet, the minimum salt-spray resistance is 400 hours for W4 and 1,000 hours for W5, the highest of the five classes.
Brands: Norma, Mikalor and ACE.
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