Rubber Screw SCM440), 9Cr18MoV, CW6Mo5Cr4V2 other materials, heat treatment using nitriding treatment, hard chrome plating layer, high-frequency quenching, spraying rubber screw series products use 38CrMoALA (JIS SACM645), 42CMo (JIS corrosion, wear bimetallic layer, vacuum hardening etc. technical indicators screw types: screw pin, hot and cold, feed screw production use: rubber machine, rubber machinery specifications: the hole Φ14-Φ300 X 8000mm diameter ratio: L / D = 8 ~ 20 surface Roughness: Ra0.4μm nitriding: surface hardness> 1000H, the nitride layer depth: 0.5-0.8mm Hardness of: HRC950-1020 nitride crispness: <= a screw straightness: 0.0015mm chrome layer thickness: 0.05 ~ 0.10mm alloy Depth: 0.8 ~ 2.0mm dual alloy hardness: HRC56 ° ~ 65 ° (alloy nickel-based alloys) data transfer at: Shenzhen Jinxin Machinery Co., Ltd. If you like long fingers, how to meet the different needs of users Jinxin? Compared with people just never break through their own efforts we have been every year, every day, we are in the progress we lead, others follow the Jinxin -!!!. to create a new era of Chinese production falters ---- runner. ? - Select Jinxin try to give me a trust, but also your responsibility very NOTE: Because the different needs of each product, so the product specifications vary as interested persons can directly call the company, the company will have a!. professionals to serve you