Dongfeng Bearing
SBR20 Heavy-Duty Linear Motion Guide Unit with Dual Bearing Blocks
SBR20 heavy-duty integrated linear motion guide unit with 20 mm shaft and dual bearing blocks, delivering 11.2 kN dynamic load per block (22.4 kN per axis). Standard lengths to 3000 mm. Designed for mid-size CNC routers, plasma cutting tables, and woodworking gantry machines.
Key Features
- 11.2 kN dynamic load per block — 44% higher than SBR16, with dual blocks delivering 22.4 kN per-axis capacity
- Dual-block configuration halves per-block stress, extending bearing travel life by approximately 80%
- Standard lengths to 3000 mm — covers most mid-size CNC router and plasma table axes without splice joints
- GCr15 chrome steel shaft HRC 58–62 on aluminum support rail eliminates deflection
- Pre-drilled mounting holes every 50 mm for direct bolt-on to aluminum extrusion frames
- Designed for mid-size CNC routers, plasma cutting tables, and woodworking gantry machines
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
| Unit Series | SBR 20 |
|---|---|
| Shaft Diameter | 20 mm |
| Shaft Material | GCr15 Chrome Steel, HRC 58–62 |
| Support Rail | Anodized Aluminum 6063-T5 |
| Blocks per Unit | 2 (dual-block) |
| Dynamic Load (per block) | 11.2 kN |
| Static Load (per block) | 17.5 kN |
| Max Standard Length | 3000 mm |
| Mounting Holes | Every 50 mm |
| Block Bolts | 4× M5 per block |
Application fit notes
User Pain Point + Solution + Data
Mid-size CNC router builders (1.5–3 m travel) and light plasma cutting table manufacturers need linear motion systems that carry heavier gantry loads than SBR16 can sustain, but don't want the complexity and cost of HGR profile rails. The SBR20 addresses this gap: the 20 mm shaft diameter increases dynamic load to 11.2 kN — 44% higher than SBR16 — while the dual-bearing-block configuration distributes the gantry weight across two contact points per rail, halving per-block load stress. At 3000 mm max standard length, the SBR20 covers full mid-size CNC router X/Y axes without splice joints.nts.
Complete Specifications
| Parameter | Value |
|---|---|
| Unit Series | SBR 20 (20 mm shaft diameter) |
| Shaft Material | GCr15 Chrome Steel, HRC 58–62 (induction hardened) |
| Support Rail Material | Anodized aluminum extrusion (6063-T5) |
| Bearing Blocks per Unit | 2 (dual-block configuration) |
| Block Type | Double-row ball bearing, aluminum housing |
| Dynamic Load (per block) | 11.2 kN |
| Static Load (per block) | 17.5 kN |
| Max Standard Length | 3000 mm (custom up to 4000 mm) |
| Mounting Holes | Every 50 mm along support rail |
| Block Mounting Bolts | 4× M5 top-face per block |
| Weight (per meter + 2 blocks) | 1.8 kg/m + 0.22 kg/block |
Product Advantages
11.2 kN — 44% Higher than SBR16
The 20 mm shaft diameter increases the ball contact area and shaft cross-section, delivering 11.2 kN dynamic load per block. With two blocks per rail, total per-axis load capacity reaches 22.4 kN — sufficient for mid-size CNC router gantries weighing 30–50 kg.
11.2 kNDual-Block Load Distribution
Two bearing blocks per rail distribute the gantry weight across two contact points, halving per-block stress. This extends bearing travel life by approximately 80% versus single-block configurations under equivalent gantry loads.
+80% Life3 m Standard Length
Standard lengths up to 3000 mm — covers most mid-size CNC router X-axes (1.5–2.5 m) and plasma cutting table Y-axes in a single piece. No splice joint alignment issues on standard machine configurations.
3000 mmAluminum Support Rail
6063-T5 anodized aluminum support eliminates shaft deflection along the full length. Pre-drilled mounting holes every 50 mm for direct bolt-on to aluminum extrusion frames or steel base plates.
Zero DeflectionEnterprise Strength
Xiamen Dongfeng Bearing Mechanical & Electrical Co., Ltd.Ltd. — established 2014, 10+ years in linear motion system manufacturing. Our 5,000 m² Xiamen facility operates 12 production lines with 200+ employees. The SBR heavy-duty cell produces SBR20–SBR30 units at 15,000+ per month, with 250 kW induction hardening capability for shaft diameters up to 50 mm.
Certifications: ISO 9001:2015, CE conformity, SGS factory audit. Export markets: 50+ countries including USA, Germany, UK, Italy, Australia, and Brazil. Partners: Supplying mid-size CNC router manufacturers, plasma cutting table builders, and woodworking machinery OEMs.
Pre-sales: Gantry load calculation and block spacing recommendation. After-sales: 18-month warranty, shaft alignment guidance. Customer case: Supplied 3,000 SBR20-2000 dual-block units to an Italian CNC router manufacturer — 3-year supply, 0.05% defect rate, zero shaft failure under 40 kg gantry load at 2 m/s rapid traverse.
Manufacturing, Exhibition & Quality Controltrol
Production Process & Quality Assuranceance
Process: GCr15 raw bar → turning → induction hardening (HRC 58–62, case depth 1.5 mm) → precision grinding (shaft Ra ≤0.4 µm, straightness ≤0.05 mm/m) → aluminum extrusion cutting and drilling → dual block machining and ball circuit assembly → unit pre-assembly with dual-block alignment verification → packaging.
Quality testing: Shaft hardness batch-tested (Rockwell), shaft straightness measured full-length, dual-block parallelism verified on test jig (≤0.02 mm deviation between blocks), block running smoothness 100% tested. Exhibitions: Exhibited at CIMT (Beijing), IWF (woodworking machinery, Atlanta), and FabTech (metal fabrication) to reach mid-size CNC and plasma equipment builders.
FAQ
What is the MOQ for SBR20 dual-block guide units?
MOQ is 30 sets (1 rail + 2 blocks per set). Mixed lengths accepted with 30-set minimum per length. For custom lengths above 3000 mm, MOQ is 20 sets. Sample sets of 2–3 units available for qualified buyers — contact us.
What are the shipping options and lead time?
FOB Xiamen. In-stock standard lengths (1000–2000 mm): 10–15 business days. Custom lengths (2500–4000 mm): 20–30 business days. Sea freight: 25–35 days to Europe, 18–25 days to USA. Long rails (2500+ mm) ship in wooden crates with steel-reinforced V-block supports.
How are SBR20 units packaged for safe shipping?
Each unit (rail + 2 blocks) is anti-corrosion oiled, wrapped in foam, and packed in individual cartons. Rails of 2000+ mm ship in wooden crates with V-block supports to prevent bending. Blocks are separately boxed and labeled for easy identification. Bulk orders use pallet packing.
What payment methods do you accept?
T/T (30% deposit, 70% before shipment). L/C at sight for orders above USD 20,000 — recommended for SBR20 orders given per-unit value. PayPal for sample orders under USD 3,000. Escrow service available for first-time buyers.
Can I get a sample with a specific rail length?
Yes. Sample SBR20-1000 units (1000 mm rail + 2 blocks) are available with buyer covering shipping. For bulk orders of 50+ sets, sample cost is fully credited. Provide your required length and block count to arrange.
Do you offer OEM branding and custom configurations?
Yes. Custom laser-engraved logo on bearing blocks for 100+ set orders. Custom rail lengths to 4000 mm for 20+ set orders. OEM packaging with buyer branding for 300+ set orders. Custom block spacing or non-standard mounting hole pitch for 500+ set orders — share your machine frame drawing.
Request a Quote for SBR20 Guide Units
Send your required rail length, gantry weight, and quantity — we reply within one business day with pricing and lead time.
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.
