Faucet Aerator Threads vs. Garden Hose Thread
Comparing 2 standards across 13 specifications. 13 key differences identified.
Faucet aerators utilize standardized ultra-fine metric and imperial screw threads to attach flow restrictors and stream straighteners to residential and commercial spouts. Common sizes include Standard M24×1.0 male, 55/64"-27 female, Junior M18.5×1.0, and Tom Thumb M16.5×1.0; bathroom lavatory faucets are commonly EPA WaterSense-certified for reduced flow, though the WaterSense program does not cover kitchen faucets.
Garden Hose Thread (GHT) is the standardized North American outdoor water coupling governed by ANSI/ASME B1.20.7. Specified as 3/4"-11.5 NH, it features a straight, non-tapered thread with a 1.0625-inch (27.0 mm) major diameter that seals via axial compression against a flat rubber washer inside the female swivel coupling.
Specification Comparison Table
13 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standard Governing Body
|
ASME A112.18.1 / CSA B125.1 / NSF 61 | ANSI / ASME B1.20.7 |
|
Standard / Regular Size (Metric)
|
M24 × 1.0 mm (Male) | M22 × 1.0 mm (Female) | — |
|
Standard / Regular Size (US Imperial)
|
15/16"-27 UNS (Male) | 55/64"-27 UNS (Female) | — |
|
Junior Size
|
M18.5 × 1.0 mm (Male) | 13/16"-27 UNS (Female) | — |
|
Tom Thumb / Tiny Junior
|
M16.5 × 1.0 mm (Male) | 5/8"-27 UNS (Female) | — |
|
Standard Flow Rate (Bathroom WaterSense / Kitchen Federal Max)
|
1.2–1.5 GPM bathroom lavatory, EPA WaterSense-certified | up to 2.2 GPM kitchen, per the federal EPAct maximum (EPA WaterSense has no kitchen faucet certification program) | — |
|
Sealing Method
|
EPDM rubber flat washer compressed against spout shoulder | — |
|
Thread Designation
|
— | 3/4"-11.5 NH (National Hose) |
|
Major Diameter (Male Outer ø)
|
— | 1.0625 inches (27.0 mm) |
|
Thread Pitch / TPI
|
— | 11.5 TPI (2.209 mm pitch) |
|
Thread Form & Flank Angle
|
— | 60° American National straight parallel thread |
|
Sealing Mechanism
|
— | Flat elastomeric washer compressed in female swivel seat |
|
Operating Water Pressure
|
— | 40–80 PSI typical residential (up to 150 PSI burst) |