We are able to produce any fusible plugs according to customer specification regarding the size, type of thread and the body material. In practice NPT fusible plugs of the following sizes and yield temperatures are considered to be standard models due to their popularity in application. These plug bodies, both brass and stainless steel, are readily in stock. Their delivery time is relatively shorter.
Standard Models
| Brass | Brass | Brass | Brass | SS | SS | SS | ||
| °F | °C | 1/8″NPT | 1/4″NPT | 3/8″NPT | 1/2″NPT | 1/4″NPT | 3/8″NPT | 1/2″NPT |
| 136 | 58 | AQS18-58 | AQS14-58 | AQS38-58 | AQS12-58 | AQS14-58SS | AQS38-58SS | AQS12-58SS |
| 160 | 71 | AQS18-71 | AQS14-71 | AQS38-71 | AQS12-71 | AQS14-71SS | AQS38-71SS | AQS12-71SS |
| 165 | 74 | AQS18-74 | AQS14-74 | AQS38-74 | AQS12-74 | AQS14-74SS | AQS38-74SS | AQS12-74SS |
| 195 | 90 | AQS18-90 | AQS14-90 | AQS38-90 | AQS12-90 | AQS14-90SS | AQS38-90SS | AQS12-90SS |
| 212 | 100 | AQS18-100 | AQS14-100 | AQS38-100 | AQS12-100 | AQS14-100SS | AQS38-100SS | AQS12-100SS |
| 230 | 110 | AQS18-110 | AQS14-110 | AQS38-110 | AQS12-110 | AQS14-110SS | AQS38-110SS | AQS12-110SS |
| 255 | 124 | AQS18-124 | AQS14-124 | AQS38-124 | AQS12-124 | AQS14-124SS | AQS38-124SS | AQS12-124SS |
| 280 | 138 | AQS18-138 | AQS14-138 | AQS38-138 | AQS12-138 | AQS14-138SS | AQS38-138SS | AQS12-138SS |
| 350 | 177 | AQS18-177 | AQS14-177 | AQS38-177 | AQS12-177 | AQS14-177SS | AQS38-177SS | AQS12-177SS |
| 360 | 182 | AQS18-182 | AQS14-182 | AQS38-182 | AQS12-182 | AQS14-182SS | AQS38-182SS | AQS12-182SS |
| 390 | 199 | AQS18-199 | AQS14-199 | AQS38-199 | AQS12-199 | AQS14-199SS | AQS38-199SS | AQS12-199SS |
| 445 | 229 | AQS18-229 | AQS14-229 | AQS38-229 | AQS12-229 | AQS14-229SS | AQS38-229SS | AQS12-229SS |
Dimensions
| Thread size | H (mm) | T (mm) | S (mm) | Orifice (mm) |
| 1/8″NPT | 16 | 5 | 12 | 5 |
| 1/4″NPT | 21 | 6.5 | 14 | 5 |
| 3/8″NPT | 20 | 6 | 17 | 7 |
| 1/2″NPT | 29 | 8 | 22 | 8 |
Specifications
Tolerance of yield temperature: ±3K
Plug body material: brass / stainless steel
Fusible alloy: eutectic alloy with several components
Test pressure: 3.0 MPa (higher pressure upon request)
Max service pressure: 5 MPa for brass, 35 MPa for stainless steel
HS code:8481809000