A hose is only as secure as its clamps. The wrong type or size is a common cause of hoses blowing off pump tails and swage nipples. This guide covers the clamp types we stock, how to measure for the right size, and how to fit them.
Clamp types compared
| Clamp | Material | Sizes we stock | Best for |
|---|---|---|---|
| Galvanised Hose Clamp | Zinc-coated steel | 2″, 4″, 6″, 8″ | General water, air and irrigation hose; bulk orders |
| Hose Clamp (Heavy Duty), Stainless Steel | Stainless steel | 2″, 4″, 6″, 8″ | Suction, delivery and mining hose on wet, muddy or chemical sites |
| Safelock Hose Clamp, Aluminium | Aluminium, bolted two-piece | 2″, 3″, 4″, 6″ | Large-bore suction and delivery hose; lines moved often |
| Safelock Hose Clamp, Stainless Steel | Stainless steel, bolted two-piece | 2″, 3″, 4″ | Large-bore hose on corrosive or permanent installations |
How to measure for the right size
Clamps are listed by nominal hose size, but what matters is the hose’s outside diameter once it is pushed onto the tail. Wall thickness differs a lot between hose types: a 4″ elephant hose is much thicker than 4″ layflat.
- Push the hose onto the tail or nipple it will be clamped to.
- Wrap a tape measure around the hose over the tail to get the circumference.
- Divide by 3.14 to get the outside diameter.
- Choose a clamp whose range covers that diameter with some take-up left.
Not sure? Send us the hose type and the outside diameter and we will confirm the clamp.
Fitting clamps so they hold
- On suction and pressure lines, fit two clamps per hose end, with the screws or bolts turned to opposite sides.
- Place clamps over the hose tail, just behind the end of the hose, never past the end of the tail.
- On bolted Safelock clamps, tighten the bolts evenly so the clamp closes square.
- Re-check and re-tighten after the first run, as rubber and PVC settle under pressure.
Which clamp for which hose
- Layflat on hose tails: galvanised or stainless band clamps.
- Heliflex suction hose: stainless or Safelock clamps, two per end.
- Elephant hose with cuffed ends: heavy-duty stainless or Safelock clamps.
- PVC mining hose on claw couplings: galvanised or stainless band clamps.
Need bulk quantities, cut lengths or a made-up assembly? Request a quote, call 010 022 4049 or email info@syre.co.za. Same-day delivery in Gauteng and Mpumalanga on orders placed before 12pm, and delivery to other provinces across South Africa.
