# Turned & Milled Components for Hydraulics & Pneumatics – Application Case > Typical components for hydraulics and pneumatics: valve blocks, piston and rod end parts in 42CrMo4 with hard chrome plating, hydraulic connectors. Batches 100–20,000 pcs. https://www.sinbo-machining.com/case/hydraulic-pneumatic-parts/ --- ## On This Page - Typical component families - Typical supply parameters - Parameter Quick Reference - Industry scenario: pressure-bearing precision with surface coordination - Typical component families and processes - Workflow: drawing, sample approval and recurring series - Quality and documentation - FAQ - Related Materials · Related Services · Related Case Studies - Planning components like these? # Turned & Milled Components for Hydraulics & Pneumatics Typical components for hydraulics and pneumatics: valve blocks, piston and rod end parts in 42CrMo4 with hard chrome plating, hydraulic connectors. Batches 100–20,000 pcs. Application at a glance ### Typical component families | Valve blocks | Aluminum, steel, milled | Piston / rod end parts | 42CrMo4, turned + ground | Hydraulic connectors | Steel, brass, Swiss-turned ### Typical supply parameters | Batch range | 100–20,000 pcs per family | Tolerance scheme | DIN ISO 2768-mK, seal seats to drawing | Surface | Hard chrome / zinc / anodizing coordinated ## Parameter Quick Reference | Parameter | Specification | Component families | Ventilblöcke (valve blocks); Kolben- / Stangen-Endteile (piston, rod end parts); Steckverbinder, Hydraulik (hydraulic connectors) | Typical materials | aluminum, steel; 42CrMo4 + hard chrome plating; steel, brass | Machining processes | milling; turning + grinding; Swiss-type turning | Typical batch sizes | 100–20,000 pcs per family | Default tolerance scheme | DIN ISO 2768-mK, seal seats to drawing | Material certificates | Hard chrome / zinc / anodizing coordinated | Inspection requirement | first article inspection | Quotation and sample lead time | quotation within 48 hours; first samples in 7–15 days ## Industry scenario: pressure-bearing precision with surface coordination Hydraulic and pneumatic components combine pressure-bearing geometry with surfaces that must cooperate with seals and coatings: valve blocks need flat, port-accurate milled faces; piston and rod end parts need grinding-ready precision before hard chrome plating; connectors need clean Swiss-turned threads and sealing geometry. The sourcing pattern is recurring series across a few core families, with surface treatment (hard chrome, zinc, anodizing) coordinated as part of the process chain so that the finished part arrives assembly-ready. ## Typical component families and processes | Component (DE / EN) | Typical material | Process | Typical batch | Ventilblöcke (valve blocks) | aluminum, steel | milling | 100–2,000 pcs | Kolben- / Stangen-Endteile (piston, rod end parts) | 42CrMo4 + hard chrome plating | turning + grinding | 500–5,000 pcs | Steckverbinder, Hydraulik (hydraulic connectors) | steel, brass | Swiss-type turning | 2,000–20,000 pcs Seal-seat geometry and surface values are the critical-to-function features and are confirmed per drawing before sampling. ## Workflow: drawing, sample approval and recurring series The standard flow: drawing review and quotation within 48 hours, first samples in 7–15 days, first article inspection and approval, then series production against the approved reference. Batch sizes follow the table above — from single spare parts to tens of thousands of pieces per order, depending on the component family. For repeat orders, tooling, program revisions and inspection records are kept on file, so call-offs remain consistent with the approved first article. Engineering changes — material substitutions, tolerance updates, packaging changes — are handled as controlled changes against the same records. ## Quality and documentation DIN ISO 2768-mK applies as the default tolerance scheme for unspecified dimensions. EN 10204 3.1 inspection certificates are standard for metallic parts, First Article Inspection supports the approval step, and RoHS/REACH declarations are available where required. Surface treatment, cleanliness and packaging requirements are confirmed per drawing. ## FAQ Can you coordinate hard chrome plating on piston parts?Yes — grinding before plating and final inspection after are part of the coordinated process chain. What valve block sizes can you mill?Blocks in aluminum and steel within our 3–5 axis milling envelope; port geometry and flatness are drawing-driven. Which connector volumes fit your Swiss lines?2,000–20,000 pieces per order is the typical range for hydraulic connectors. How are seal seats specified?Per drawing — seal-seat geometry and surface roughness are confirmed as critical-to-function features before sampling. ### Related Materials · Related Services · Related Case Studies [Related Materials: Steel ](https://www.sinbo-machining.com/products/materials/steel/)[Related Services: Cnc Machining ](https://www.sinbo-machining.com/services/cnc-machining/)[Related Case Studies: Hydraulic Cylinder Body ](https://www.sinbo-machining.com/case/hydraulic-cylinder-body/)[· Gcc Pump Mro Parts ](https://www.sinbo-machining.com/case/gcc-pump-mro-parts/)This page describes a representative application scenario for the hydraulics and pneumatics component manufacturing industry, compiled from typical requirements of this vertical. It is not tied to any specific customer or order; series quantities, materials and tolerances are confirmed per drawing for each enquiry. ## Planning components like these? Send your drawing — Sinbo Precision will review material, tolerance scheme and batch plan and return a quotation within 48 hours. Samples in 7–15 days. [Get a Quote in 48 Hours ](https://www.sinbo-machining.com/quote/)