| Params | • Processing mode: Custom silica-sol investment casting according to customer-approved 2D drawings, 3D models or physical samples
• Material options: Carbon steel 1020, 1025, 1030, 1040, 1045 and 1050; alloy steel 4140, 4150, 4340 and 8620; stainless steel 201, 303, 304, 316, 316L, 17-4PH, 410 and 420
• Product types: Door closer arms, pivot links, connecting rods, mounting brackets, adjustment cams, retaining components and customized door-control hardware
• Part weight: 2 g–550 g for applicable components, subject to product geometry and approved drawing requirements
• Casting accuracy: Tolerance grade T4–CT7
• Surface roughness: Ra 1.6–Ra 6.3, depending on casting, machining and finishing requirements
• Minimum wall thickness: 2 mm standard; 1 mm available for limited local areas subject to process review
• Fillet requirements: Minimum outer radius ≥ 0.3 mm; minimum internal fillet ≥ 0.5 mm
• Machinable features: Pivot holes, shaft holes, threaded holes, mounting holes, locating slots, connection interfaces and critical mating surfaces
• Machining capability: CNC turning, milling, drilling, boring, tapping, reaming, grinding and deburring
• Heat treatment: Annealing, quenching, normalizing, carburizing and tempering according to material and strength requirements
• Surface treatment: Shot blasting, polishing, black oxide, zinc coating, nickel plating, chrome plating, painting, powder coating and customized finishing
• Inspection standard: Material composition, pivot-hole dimensions, hole positions, linkage length, assembly fit, critical tolerances and appearance inspected according to approved drawings
• Customization options: Arm length, connection angle, pivot position, mounting-hole layout, threaded interface, surface finish and logo
• Production support: Prototype development, sample verification, trial orders and stable batch production available
• Applied standards: ASTM, BS, DIN, JIS, ISO and customer-specified technical requirements | Material | Carbon steel / stainless steel / alloy steel, customized according to drawing |
