Hose specification
SAE 100R4 — Suction & Return
SAE 100R4 is the suction and return hose: its wire helix keeps the tube from collapsing under pump-inlet vacuum, which is the failure pressure hose can't resist. Use it between reservoir and pump, never as a pressure line.
Working pressure
Ratings by size.
| Size | Working pressure |
|---|---|
| -12 (3/4") | 300 psi |
| -16 (1") | 250 psi |
| -20 (1-1/4") | 200 psi |
| -24 (1-1/2") | 150 psi |
| -32 (2") | 100 psi |
Working pressures per the published standard with 4:1 minimum burst safety factor. The assembled hose + fitting combination governs the final assembly rating.
Construction & duty
What it's made of.
Nitrile tube with textile plies and an embedded steel wire helix to resist vacuum collapse.
- Temp range
- -40°F to +212°F
- Typical applications
- Pump suction linesGravity return linesReservoir plumbing
Get it from A1.
Cut to length and crimped while you wait at 2201 Handley Ederville Road. (817) 589-7101.
SAE 100R4 — Suction & Return — FAQs
Why can't I use pressure hose for suction?
Under inlet vacuum a non-helix hose can collapse internally, starving the pump — which cavitates and destroys it. Suction needs the R4 helix.
What causes a whining pump after a hose change?
Often a collapsed or undersized suction line. Check that R4 of the correct diameter was used and that clamps aren't crushing it.
Other standards