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Get Multiple Factory Quotes for Your Parts in 24 Hours
Connect with 800,000+ listed factories in Asia. Receive multiple quotes for your parts and manage production with speed and confidence.
Precision Ball Screws Ground to C3 Through C7 Accuracy
When your first ball screw production run clears inspection at ±1.8µm axial clearance but batch two arrives at ±3.2µm—forcing failed acceptance tests and endless negotiations—you need suppliers with documented process control who hold tolerances across every order, or for simpler axes where self-locking under gravity load matters more than positioning resolution, a trapezoidal lead screw that eliminates the need for a holding brake altogether.
This directory connects you directly with verified Chinese manufacturers producing high precision ball screws, precision ground ball screws, and acme ball screws for CNC machines, robotics, and aerospace actuation systems. Make sure your support units come from the same tolerance family as the screw — mismatched preload is the most common cause of premature pitch error. Factory profiles show operational scale (20-500 employees), quality control staffing (3-15 inspectors), and grinding equipment.
Browse profiles to verify SPC capabilities and tolerance documentation, contact manufacturers directly to discuss specifications, or submit a Request for Quotation (RFQ) with CAD files and tolerance requirements to receive multiple comparable quotes within approximately 24 hours from capability-matched factories.
Every buyer receives a dedicated English-speaking account manager at no charge. You can select from three NDA protection levels (basic, standard, enhanced) when sharing technical drawings. Directory listings display basic information including years in operation (5-25+ years), employee count, export percentage (40-80%), and general product categories with price ranges.
Detailed capabilities become visible through direct factory contact or RFQ responses. For precision ground ball screws, this includes grinding equipment specifications (cylindrical grinders, thread grinders), documented surface finish measurements (Ra values), metallurgical test reports, and certified tolerances on pitch accuracy.
Frequently Asked Questions
How Do I Verify a Factory Can Hold ±2µm Axial Clearance Across Production Batches?
Request documented inspection reports from recent production runs showing measured clearances on at least 20 consecutive units, not just first-article samples. Ask specifically about grinding equipment (brand, model, age) and whether they use temperature-controlled manufacturing environments at 20°C ±1°C. Order a statistically meaningful sample like 10 pieces and measure every unit yourself to confirm consistency before committing to full production.
What Should I Include in My RFQ to Get Quotes Matching My Precision Requirements?
Specify critical tolerances explicitly (axial clearance ±2µm, pitch accuracy ±5µm/300mm, lead error <0.012mm), required surface finish like Ra <0.2µm, and mandatory heat treatment or hardness requirements (58-62 HRC ranges). Include your application context (CNC machine tool, aerospace actuator, robotic joint) and request material certifications, grinding process details, and typical batch-to-batch variation data in quote responses.
Can I Order Small Batches of 5-10 Precision Ball Screws for Prototype Testing?
The platform has no minimum order quantity for RFQ submissions, but precision ground ball screws typically require factory minimums of 10-50 pieces because grinding and heat treatment setups have high fixed costs. Some manufacturers quote smaller quantities at 30-50% higher per-unit prices, especially if you indicate future volume potential of 100-500 units. Submit your RFQ with actual prototype quantity clearly stated to see which factories accommodate smaller batches.
Why Do Lead Times Stretch from Quoted 8-12 Weeks to Actual 12-16+ Weeks?
Complex customization on precision lead screws adds 2-4 weeks because grinding custom lead angles (10mm-50mm pitch ranges) or non-standard diameters requires dedicated machine setups and multiple inspection cycles. Heat treatment variability adds delay when batches fail hardness testing and require process restarts, adding 2-4 weeks without immediate notification. Build 20-30% buffer time into project schedules and request weekly production updates through your account manager.
What Certifications Should I Require for Ground Ball Screws in CNC Machines?
ISO 9001 and material traceability documentation are baseline requirements showing documented quality processes and material origin proof with mill certificates. IATF 16949 certification indicates automotive-grade process control for automotive applications. Insist on certified metallurgical test reports showing hardness values (58-62 HRC), case depth measurements (0.8-1.2mm), and microstructure analysis, not just certificates of compliance without supporting data.
How Do I Compare Quotes from Multiple Factories Claiming Similar Tolerances?
Look beyond quoted tolerance numbers to supporting evidence: does the factory provide actual CMM inspection reports, grinding machine specifications (Studer, Schaudt, Okuma models), and statistical process control data with Cpk ≥1.33? Compare quality documentation depth, ask about reject rates on similar precision lead screw projects (2-5% is typical), and request references from customers with comparable requirements. The factory offering lowest price without inspection documentation presents different risk than one charging 15-20% more with comprehensive quality records.
