Import Bolts Heater 1.2311(4)- 24.5x900 — Buy in wholesale FOB from Supplier in China

The bolts heater 1.2311(4)-24.5X900 is a specialised thermal component engineered for power generation equipment, specifically designed to apply controlled heat to threaded fasteners during turbine maintenance or assembly. The designation encodes critical dimensional data: a 24.5 mm diameter and 900 mm active heated length, with 1.2311 referring to the German Werkstoff material grade for a tool steel substrate that provides thermal stability and mechanical strength at elevated temperatures. Dongfang Yoyik Engnieering Co., Ltd., based in Deyang, Sichuan Province, lists this heater among its perennial offerings for steam turbine and turbine generator applications, where precise bolt thermal management prevents galling and ensures proper preload during hot assembly procedures.

The 1.2311 base material (equivalent to AISI P20 modified) is a pre-hardened chromium-manganese-molybdenum tool steel with typical hardness of 280-320 HBW and good dimensional stability during thermal cycling. In bolts heater construction, this substrate typically carries a sheathed resistance heating element, commonly mineral-insulated with magnesium oxide insulation surrounding a nickel-chromium or iron-chromium-aluminium conductor. The 24.5 mm diameter permits insertion into standard turbine bolting bores, while the 900 mm length addresses multi-stud arrangements in high-pressure cylinder flanges or steam valve chests. Standard industry practice requires watt density below 5 W/cm² for tool-steel-sheathed heaters to prevent material degradation, with typical operating temperatures ranging from 200°C to 400°C depending on bolt grade and interference fit specifications.

Primary buyers are thermal power plant maintenance departments, independent power producers (IPPs), and original equipment manufacturer (OEM) service teams servicing Dongfang, Harbin, Shanghai, and imported turbine fleets. The heater supports hot torquing procedures for 12CrMoV, 25Cr2MoVA, and similar high-temperature bolting steels where ambient assembly would induce unacceptable stress concentrations. Trade terms for this specialised spare part are not specified in the listing data; buyers should confirm MOQ, lead time, and whether the heater is supplied with thermocouple integration or as a bare element. Packaging typically involves moisture-sealed containers with silica gel desiccant to prevent sheath corrosion during extended storage.

Dongfang Yoyik Engnieering Co., Ltd. operates from 4-3f, Building A, Huashan Platz, in Deyang, Sichuan Province, China, placing it within one of China's concentrated industrial corridors for power equipment manufacturing. The company's profile indicates a specialisation in perennial supply of spare parts for steam turbines, turbine generators, and associated power plant systems rather than original equipment manufacture. Its trust tier is classified as harbour, and the response rate is recorded at 0.00 with zero average response hours, which buyers should note when evaluating communication reliability for time-sensitive procurement.

The supplier's product breadth extends across EH oil system filters, fluorine rubber O-rings, EHC system pumps and valves, automatic control components, water turbine generators, bearings, electrical insulation materials, and displacement/position sensors including LVDT and eddy current types. The listing for the bolts heater 1.2311(4)-24.5X900 appears within this broader power plant spare parts catalogue, suggesting the company stocks or sources maintenance items across multiple turbine OEM platforms. No verified factory audit data, ISO certification claims, or annual revenue figures are present in the source material. Buyers are advised to request supplier qualification documentation directly.