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.
Highlights
- 11.2 kN dynamic load per block β 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 β covers most mid-size CNC router and plasma table axes without splice joints
- GCr15 chrome steel shaft HRC 58β62 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
| Unit Series | SBR 20 |
|---|---|
| Shaft Diameter | 20 mm |
| Shaft Material | GCr15 Chrome Steel, HRC 58β62 |
| 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 | 4Γ M5 per block |
User Pain Point + Solution + Data
Mid-size CNC router builders (1.5β3 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 β 44% higher than SBR16 β 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.
Complete Specifications
| Parameter | Value |
|---|---|
| Unit Series | SBR 20 (20 mm shaft diameter) |
| Shaft Material | GCr15 Chrome Steel, HRC 58β62 (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 | 4Γ M5 top-face per block |
| Weight (per meter + 2 blocks) | 1.8 kg/m + 0.22 kg/block |
Product Advantages
11.2 kN β 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 β sufficient for mid-size CNC router gantries weighing 30β50 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 β covers most mid-size CNC router X-axes (1.5β2.5 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. β established 2014, 10+ years in linear motion system manufacturing. Our 5,000 mΒ² Xiamen facility operates 12 production lines with 200+ employees. The SBR heavy-duty cell produces SBR20βSBR30 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 β 3-year supply, 0.05% defect rate, zero shaft failure under 40 kg gantry load at 2 m/s rapid traverse.
Manufacturing, Exhibition & Quality Control
Production Process & Quality Assurance
Process: GCr15 raw bar β turning β induction hardening (HRC 58β62, case depth 1.5 mm) β precision grinding (shaft Ra β€0.4 Β΅m, straightness β€0.05 mm/m) β aluminum extrusion cutting and drilling β dual block machining and ball circuit assembly β unit pre-assembly with dual-block alignment verification β packaging.
Quality testing: Shaft hardness batch-tested (Rockwell), shaft straightness measured full-length, dual-block parallelism verified on test jig (β€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 2β3 units available for qualified buyers β contact us.
What are the shipping options and lead time?
FOB Xiamen. In-stock standard lengths (1000β2000 mm): 10β15 business days. Custom lengths (2500β4000 mm): 20β30 business days. Sea freight: 25β35 days to Europe, 18β25 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 β 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 β share your machine frame drawing.
Request a Quote for SBR20 Guide Units
Send your required rail length, gantry weight, and quantity β we reply within one business day with pricing and lead time.
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