Dongfeng
BSH Series Miniature Ground Ball Screw for Precision Instruments
BSH Series miniature ground ball screw with shaft diameters 6–12 mm and C5 precision grade (±0.008 mm/300 mm lead accuracy). Compact 20 mm nut envelope and 2.1 kN dynamic load at BSH0802. Designed for medical pipetting robots, lab automation, and optical positioning systems requiring sub-micron resolution in tight envelopes.
Key Features
- C5 ground precision: ±0.008 mm/300 mm lead accuracy — 6× tighter than C7 rolled, required for medical and optical positioning
- Shaft diameters from 6 mm — fits handheld medical devices, lab micro-stages, and miniature XY tables
- Compact 20 mm nut envelope width — fits multi-axis lab automation and medical mechanism constraints
- 2.1 kN dynamic load at BSH0802 (8 mm shaft, 2 mm lead) — sufficient for lab automation Z-axis and micro-pump drives
- 9Cr18Mo stainless steel option for medical and food-grade corrosion resistance, maintaining C5 precision
- Climate-controlled grinding room (±1°C) and laser scale measurement ensure consistent sub-micron precision
Common Sourcing Problems & How We Solve Them
Buyer Pain Points
- Inconsistent dimensional tolerances across batches cause machine downtime and re-work costs
- Suppliers unable to provide material certs, inspection reports or CE documentation for customs clearance
- Long lead times and high MOQ requirements make sample evaluation and first orders difficult
Dongfeng Solution
- ISO 9001:2015 process controls with CMM dimensional inspection on every production batch
- Full documentation package: material cert, SGS test report, CE declaration, packing list on request
- Flexible MOQ from 1 piece for samples; bulk order lead time 15–20 working days
Performance Data
- 10+ years of linear motion component manufacturing — 50+ export markets served
- Hardness tested to HRC 58–62; dimensional tolerance held to JIS / ISO / DIN standard grade
- CE & SGS certified; ISO 9001:2015 quality management system in production
Utility record
| Shaft Diameter | 6 mm – 12 mm |
|---|---|
| Lead Options | 1 / 2 / 2.5 mm |
| Precision Grade | C5 (ISO 3408) — ground |
| Lead Accuracy | ±0.008 mm / 300 mm |
| Material | GCr15 Chrome Steel or 9Cr18Mo Stainless |
| Shaft Hardness | HRC 60–64 (chrome) / 54–58 (stainless) |
| Nut Type | Single flange, pre-loaded option |
| Dynamic Load (BSH0802) | 2.1 kN |
| Static Load (BSH0802) | 3.5 kN |
| Standard Lengths | 100 mm – 600 mm |
Application fit notes
User Pain Point + Solution + Data
Medical pipetting robots, lab automation stages, and miniature optical positioning systems require ball screws with shaft diameters under 16 mm and lead accuracy better than ±0.008 mm/300 mm — a combination that rolled SFU series cannot deliver and standard ground SFE2005 is too large for. The BSH Series miniature ground ball screw fills this gap: shaft diameters from 6 mm to 12 mm, C5 precision grade (±0.008 mm/300 mm), and a compact nut body that fits within 20 mm envelope width. Despite the small size, the BSH0802 (8 mm shaft, 2 mm lead) delivers 2.1 kN dynamic load — sufficient for lab automation Z-axis and micro-dispensing pump drives.
Complete Specifications
| Parameter | Value |
|---|---|
| Shaft Diameter Range | 6 mm – 12 mm |
| Lead Options | 1 mm / 2 mm / 2.5 mm (size-dependent) |
| Precision Grade | C5 (ISO 3408) — ground |
| Lead Accuracy | ±0.008 mm / 300 mm |
| Material | GCr15 Chrome Steel, through-hardened and ground |
| Shaft Hardness | HRC 60–64 |
| Nut Type | Single flange nut, pre-loaded (zero backlash option) |
| Dynamic Load (BSH0802) | 2.1 kN |
| Static Load (BSH0802) | 3.5 kN |
| Standard Lengths | 100 mm – 600 mm |
| Nut Envelope Width | 20 mm (BSH08) – 28 mm (BSH12) |
Product Advantages
C5 Ground Precision
Ball track is ground after through-hardening, achieving ±0.008 mm/300 mm lead accuracy. This is the precision level required for medical pipetting (±0.1 mm positioning) and optical lens positioning where rolled screws' ±0.05 mm is insufficient.ent.
C5 Ground6 mm Minimum Diameter
Shaft diameters from 6 mm — small enough for handheld medical devices, lab automation micro-stages, and miniature XY tables. The BSH0601 (6 mm × 1 mm lead) achieves 0.5 µm theoretical resolution per motor step.
6 mm MinCompact Nut Envelope
Nut body width as narrow as 20 mm — fits within the tight envelope constraints of multi-axis lab automation stages and medical device mechanisms where space is at a premium.
20 mm WidthStainless Steel Option
Available in martensitic stainless steel (9Cr18Mo, HRC 54–58) for medical and food-grade applications requiring corrosion resistance and wipe-down cleaning. Stainless variant maintains C5 precision grade.
Stainless OptionEnterprise Strength
Xiamen Dongfeng Bearing Mechanical & Electrical Co., Ltd.Ltd. — established 2014, 10+ years in precision ball screw manufacturing. Our 5,000 m² Xiamen facility operates 12 production lines with 200+ employees, including a dedicated miniature ground ball screw cell in a climate-controlled room (±1°C). Monthly capacity for BSH series: 3,000+ assemblies.
Certifications: ISO 9001:2015, CE conformity, SGS factory audit. Export markets: 50+ countries including Germany, Switzerland, USA, Japan, and South Korea. Partners: Supplying medical device manufacturers, lab automation OEMs, and optical instrument producers.
Pre-sales: Application resolution calculation and nut envelope verification. After-sales: 18-month warranty, lead accuracy measurement data per shaft. Customer case: Supplied 2,500 BSH0802 assemblies to a German lab automation OEM — 4-year supply, zero precision drift, measured lead accuracy retention 99% after 8,000 hours of continuous operation.
Manufacturing, Exhibition & Quality Controltrol
Production Process & Quality Assuranceance
Process: GCr15 or 9Cr18Mo bar stock → CNC precision turning → vacuum through-hardening (HRC 60–64 for chrome, 54–58 for stainless) → cylindrical grinding → ball track precision grinding in climate-controlled room → nut machining and ball circuit assembly → pre-load calibration → laser scale lead measurement → cleanroom packaging.
Quality testing: Lead accuracy measured by laser scale (±0.001 mm resolution), nut running torque at 3 positions, pre-load force verified per assembly, surface roughness Ra ≤0.2 µm on ground ball track. Exhibitions: Exhibited at MEDICA (Düsseldorf), SEMICON China, and Analytica (Munich) to engage medical device and lab instrument manufacturers.
FAQ
What is the MOQ for BSH miniature ground ball screws?
MOQ is 20 pieces per configuration (diameter + lead + length). For custom end machining or stainless steel variant, MOQ is 15 pieces. This is a precision ground product — lead time and MOQ reflect the grinding setup cost. Sample assemblies available for qualified buyers.
What are the shipping options and lead time?
FOB Xiamen. Standard configurations: 20–30 business days (ground production + measurement). Custom end machining or stainless: 25–35 business days. Express courier (DHL/FedEx): 5–7 days for samples. Sea freight for bulk: 25–35 days to Europe, 18–25 days to USA.
How are miniature ground ball screws packaged?
Each assembly is cleaned in ultrasonic bath, anti-corrosion treated, vacuum-sealed in cleanroom-grade bags, and packed in foam-lined individual cartons. 10 assemblies per outer carton. This packaging meets medical and lab equipment industry requirements for cleanliness.
What payment methods do you accept?
T/T (30% deposit, 70% before shipment). L/C at sight for orders above USD 15,000. PayPal for sample orders under USD 3,000. Escrow service available for first-time buyers.
Can I get a sample with lead accuracy measurement data?
Yes. Sample assemblies include laser scale lead accuracy measurement data (plot + numerical report). This is standard for all BSH orders, not just samples. For bulk orders of 30+ pieces, sample cost is fully credited.
Do you offer stainless steel variants and OEM services?
Yes. 9Cr18Mo stainless steel variant available for medical and food-grade applications (MOQ 15 pieces). OEM laser-engraved part marking on nut body available for 50+ piece orders. Custom nut envelope dimensions for space-constrained applications available for 100+ piece orders — share your envelope drawing.
Request a Quote for BSH Miniature Ground Screws
Send your shaft diameter, lead, required length, material (chrome or stainless), and quantity — we reply within one business day.
Request a QuoteWhy Buyers Choose Dongfeng Bearing
Xiamen Dongfeng Bearing Mechanical & Electrical Co., Ltd. — direct factory, 10+ years precision linear motion manufacturing
ISO 9001:2015, CE Declaration of Conformity, SGS test reports. Documentation available for EU and North American import requirements.
12 precision grinding and CNC machining lines; monthly output 500,000+ pieces across linear bearing and guideway series.
Germany, USA, Japan, South Korea, India, Southeast Asia and 40+ other countries. FOB Xiamen with DHL / FedEx / sea freight options.
Technical selection support before order. Dimensional drawing, material cert and inspection report with shipment. 12-month warranty on manufacturing defects.
Manufacturing Process & Quality Assurance
Precision Machining
CNC grinding centers hold ball raceway geometry to ±0.003 mm. Induction hardening targets contact zones to HRC 58–62 without embrittling the full body.
CMM Dimensional Inspection
Every batch passes coordinate measuring machine (CMM) verification. Key dimensions — bore, OD, length, raceway radius — are logged against JIS / ISO tolerance bands.
Certification & QC
ISO 9001:2015 controls govern raw material intake, in-process check, and final inspection. SGS and CE documentation issued on request for each shipment.
Trade Shows & Partnerships
Regular exhibitor at Canton Fair and Hannover Messe. Established supply partnerships with automation integrators and machine tool OEMs across Europe and Asia.
Customer Application Cases
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