Import Bolts Heater 1.2311(4)-ã�?21x800 — Buy in wholesale FOB from Supplier in China

The bolts heater 1.2311(4)-21X800 is a precision-engineered electric heating element designed for industrial bolt applications, featuring a 21 mm diameter and 800 mm active length. It is manufactured from material grade 1.2311 (equivalent to AISI H13), a hot-work tool steel with high thermal stability and resistance to thermal fatigue. The heater is constructed with a seamless stainless steel sheath, filled with high-purity magnesium oxide insulation, and terminated with a ceramic-insulated terminal block rated for 600°C. All dimensions are held to ±0.1 mm tolerance as per the supplier's internal control standards.

The material 1.2311 is a standard choice in power plant and heavy machinery applications where thermal cycling and mechanical stress are common. Typical industry specifications for such heaters include a surface load of 5 to 8 W/cm², a maximum operating temperature of 650°C, and a resistance tolerance of ±5%. The sheath is not coated, as the base material provides sufficient corrosion resistance in dry, high-temperature environments. This variant is not rated for immersion or wet environments, and its use is restricted to dry, controlled bolt heating scenarios such as thermal expansion fitting or maintenance disassembly.

These heaters are primarily purchased by maintenance teams in thermal power stations, steel mills, and heavy equipment repair facilities for use in turbine bolt heating, flange separation, and large-diameter fastener removal. Buyers typically order in batches of 10 to 50 units, with packaging in individual cardboard sleeves and a single carton per 10 units. The supplier confirms compliance with ISO 9001 for production processes, but does not provide third-party certification for individual units. Lead time is 15 to 20 working days after order confirmation, and payment terms are T/T in advance.

Deyang Dongfang Yoyik Engineering Co., Ltd. is a supplier based in Deyang, Sichuan, China, specializing in power plant components and industrial heating elements. The company operates from a facility in Huashan Plaza, Jingyang District, and uses CNC machining and automated production lines for precision parts. It is verified as a harbor-tier supplier, indicating basic compliance with platform verification standards. The listing shows no third-party certifications, revenue figures, or client references, and response metrics are unavailable.

The supplier does not claim to be a manufacturer of the base material 1.2311, nor does it state ownership of heat treatment facilities. Its role appears to be assembly and finishing of components sourced from external suppliers. It offers a range of turbine and boiler accessories, including sensors, transmitters, and heating rods, but does not publish test reports or material traceability for individual heater units. Buyers should treat this as a component assembler rather than a metallurgical producer.