Seller: blueclockmaker (1.216) 100%, Location: Gosport, Ships to: EuropeanUnion, Item: 382590907463 Arbors and pinions We use EN8DM (BS970: 212A42) Medium Carbon Free cutting Steel for our arbours and pinions. We find this material, in its normal state, is hard enough for pinion work. However, the carbon content is controlled within the range that is suitable for components requiring flame or induction hardening. Standard range is .55 to .95 modules in 6, 7 and 8-leaf.Outside this range sometimes stocked - check first - These may cost a little more. For verge & high quality clocks ? we can cut silver steel pinions. Ask for details.