Import Bolts Heater 1.2311(4)- 27.5x1200 — Buy in wholesale FOB from Supplier in China

The bolts heater 1.2311(4)- 27.5X1200 is an specialised electric heating element engineered for thermal expansion of turbine bolts in power generation equipment. The designation 1.2311 indicates the German DIN material grade for pre-hardened plastic mould steel, though in this application it serves as the sheath material for the heater rod. The dimensional code 27.5X1200 specifies a 27.5 mm diameter heater with 1200 mm active length, a standard size for medium-capacity steam turbine cylinder bolt heating applications. Dongfang Yoyik Engnieering Co., Ltd. supplies this component from their Sichuan facility to thermal and hydroelectric power plants across China.

The heater construction typically comprises a resistive heating element embedded within a metallic sheath, with 1.2311 steel providing moderate corrosion resistance and structural integrity at operating temperatures. Standard industry practice for bolt heaters involves sheath temperatures reaching 400-500 degrees Celsius during the heating cycle, with voltage ratings commonly at 220V or 380V AC depending on plant electrical standards. The 27.5 mm diameter suits bolt bores in turbines rated approximately 100-300 MW, though actual compatibility requires verification against specific turbine manufacturer drawings. Typical wattage for this dimensional class ranges 2.5-4.0 kW, with tolerance on diameter typically +0.1/-0.2 mm for slip-fit installation.

Buyers for this product are predominantly maintenance departments at coal-fired, gas-fired, and hydroelectric power stations, as well as specialist turbine overhaul contractors. The heater enables controlled thermal expansion that releases interference-fit bolts without mechanical damage during turbine disassembly. When sourcing, confirm the terminal configuration (threaded stud, plug, or flying leads), cable length and rating, and whether the unit includes built-in thermocouple for temperature monitoring. Dongfang Yoyik lists this among their power plant spare parts catalogue alongside eddy current sensors, LVDT transducers, and actuator components, indicating vertical integration within turbine instrumentation and maintenance supplies.

Dongfang Yoyik Engnieering Co., Ltd. operates from 4-3F, Building A, Huashan Platz in Deyang, Sichuan Province, China, postal code 618000. The company holds a harbor trust tier classification on the platform, with a recorded response rate of 0.00 percent and zero average response hours, suggesting either newly listed status or inactive inquiry management. The listing presents the company as serving thermal power plants, hydroelectric facilities, metal mines, coal mines, steel plants, cement plants, and the petroleum, chemical, and natural gas sectors.

The supplier's product range extends beyond bolt heaters to encompass a broad array of power plant instrumentation and control components. Their catalogue includes eddy current sensors from EPR/Emerson (PR6422 and PR6424 series), LVDT displacement sensors in multiple stroke lengths, turbine protection systems, flame detection probes, pressure switches, and communication modules. This positioning indicates specialisation in rotating machinery condition monitoring and turbine maintenance rather than generic industrial supply. The listing does not state ISO certification, factory size, annual revenue, export licence status, or specific client references, so these should be verified directly with the supplier if required for vendor qualification.