Product Description
Linear Motion Block SBR16LUU – Open Extended Linear Bearing Solid Block for 16mm Round Rail Systems
The SBR16LUU is a long type linear motion block engineered for 16mm diameter supported round rail systems. As an open extended linear bearing solid block, it integrates two internally mounted open linear bearings (LM16UU-OP×2) within a single anodized aluminum housing, producing an overall length approximately twice that of a standard SBR16UU unit. This extended dual-bearing architecture is the defining structural advantage of the SBR16LUU: it substantially increases load capacity in all directions, reduces angular deviation under eccentric or cantilevered loads, and delivers the kind of positional repeatability that precision-driven industrial applications demand.
For design engineers, procurement managers, and system integrators sourcing linear motion components for automated machinery, CNC platforms, or multi-axis handling systems, the SBR16LUU open type extended linear bearing block offers a mechanically reliable and cost-effective upgrade path over standard-length alternatives - particularly in scenarios where travel span is long relative to the load footprint, or where anti-tipping rigidity across the full stroke is a non-negotiable specification requirement.
What Makes the SBR16LUU a Long Type Linear Motion Block
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Extended Length, Dual Bearing Configuration
The designation "LUU" in SBR16LUU directly encodes the product's structural identity. While a standard SBR16UU block houses a single LM16UU bearing, the SBR16LUU houses two LM16UU-OP open bearings arranged in tandem along the travel axis. This doubles the effective bearing span within the same housing unit, resulting in a block length (L) of 85mm versus the approximately 45mm of a standard unit.
The practical engineering consequence of this extended span is significant. A longer bearing contact length means the block resists moment loads - forces that act perpendicular to the direction of travel - far more effectively than a single-bearing unit. In applications involving overhanging loads, side-mounted actuators, or high-speed reciprocating motion, this resistance to tilting and rocking translates directly into longer service life, tighter positional accuracy, and reduced wear on both the block and the guide rail. -
Open Bottom Design for Full-Stroke Rail Compatibility
The term "open type" in this product's classification refers specifically to the open-slot geometry at the base of the aluminum housing. This longitudinal opening at the bottom of the SBR16LUU block is not a manufacturing omission - it is a deliberate functional feature that allows the block to clear the rail support bracket (the SBR-type aluminum support base) during travel. Without this open bottom profile, the housing would collide with the bracket feet before completing its intended stroke.
This open type extended linear bearing block design is therefore standard across the entire SBR series and is what distinguishes supported round rail slide units from unsupported shaft systems. For system designers, this means full usable stroke length is preserved regardless of bracket spacing, and the block can be integrated into existing SBR16 rail assemblies without modification.
Materials & Construction – SBR16LUU Open Extended Linear Bearing Solid Block
Anodized Aluminum Alloy Housing
The SBR16LUU linear motion block housing is manufactured from die-cast or extruded aluminum alloy (ADC12 / 6061-T6), surface-finished through anodizing to form a dense Al₂O₃ protective layer. This keeps the long type linear motion block lightweight for low-inertia travel, while providing reliable corrosion resistance without any dimensional change to precision mounting interfaces. Four M5 tapped holes (4-S pattern) are machined into the top face for carriage attachment.
GCr15 Bearing Steel Core
The two open linear bearings inside this open type extended linear bearing block are made from GCr15 high-carbon chromium bearing steel (≡ AISI 52100 / SUJ2), through-hardened to HRC 60–64. Raceways and balls are precision-ground to mirror finish - no electroplating is applied, preserving the exact internal clearance critical to smooth, repeatable linear motion. Anti-rust oil is applied at the point of manufacture for transit and storage protection.
SBR16LUU Specifications – Full Parameter Table
| Parameter | Value |
|---|---|
| Unit Designation | SBR16LUU |
| Shaft Diameter Compatibility | 16 mm |
| h | 20 mm |
| E (±0.02) | 22.5 mm |
| W | 45 mm |
| L | 85 mm |
| F | 33 mm |
| h₁ | 10 mm |
| θ | 80° |
| B (±0.02) | 32 mm |
| C (±0.2) | 60 mm |
| Bolt Thread (S) | M5 |
| L₁ | 12 mm |
| T | 9 mm |
| Matched Linear Bearing | LM16UU-OP × 2 |
| Dynamic Load Rating (Cd) | 1548 N |
| Static Load Rating (C₀) | 2360 N |
| Weight | 300 g |
All dimensions are in millimeters unless otherwise noted. Custom specifications and tolerance adjustments are available upon inquiry.
Applications of the SBR16LUU Open Type Extended Linear Bearing Block
The SBR16LUU open extended linear bearing solid block is deployed across a wide range of light to medium industrial sectors where guided linear travel, load stability, and long service intervals are concurrent requirements. Its extended length and dual-bearing configuration make it particularly well-suited to applications where a standard-length block would be insufficient to control moment loads or maintain positional accuracy over the full operating stroke.
CNC Machinery and Precision Routing Equipment
In CNC routers, engraving machines, and plasma cutting tables, the SBR16LUU is commonly specified for axis carriage assemblies where the cutting head or spindle must traverse long distances while maintaining tight perpendicularity to the workpiece. The long type block's extended bearing span resists the tipping forces generated by the tool's lateral cutting loads, preserving cut quality and surface finish across the full work area.
Industrial Automation and Pick-and-Place Systems
Automated pick-and-place platforms, gantry robots, and Cartesian handling systems frequently operate at high cycle rates with varying payload positions. In these systems, the SBR16LUU linear motion block provides the stability margin needed to handle off-center loads without introducing angular error into the positioning cycle. Its lightweight aluminum housing contributes to faster acceleration profiles without compromising the rigidity of the carriage structure.
Packaging, Printing, and Textile Machinery
Packaging lines, label applicators, flexographic printing units, and textile processing machines all involve high-frequency reciprocating linear motion under consistent load conditions. The SBR16LUU's dual-bearing design and hardened GCr15 steel core are well-matched to these high-cycle environments, where bearing wear rate directly determines maintenance intervals and machine uptime.
Medical Equipment and Laboratory Automation
In applications where smooth, low-vibration travel is as important as load capacity - such as laboratory liquid handling systems, diagnostic imaging platforms, or automated sample processing equipment - the SBR16LUU open extended linear bearing block delivers consistent, repeatable motion with minimal stick-slip behavior across the operating stroke.
Why Source the SBR16LUU from Zhejiang SQ
17+ Years Of Specialized Linear Motion Manufacturing
ISO 9001 Certified Quality Management
ROHS And REACH Compliant
OEM, Custom Packaging And Application Support
Zhejiang SQ has produced linear motion components since 2007, operating from a 19,800 m² facility in Lishui, Zhejiang. The production line includes 126 CNC lathes, 52 CNC grinding machines, and dedicated automated assembly and inspection equipment - a scale built for consistent output across both standard and custom SBR16LUU orders.
Every SBR16LUU linear motion block undergoes multi-stage quality control: incoming material inspection, in-process monitoring, and final dimensional verification before shipment. SQ holds ISO 9001 certification and has maintained a zero major quality complaint record since founding, with no non-conformance findings across annual regulatory spot checks.
All SQ linear motion products have passed ROHS and REACH compliance verification, meeting European Union environmental and chemical regulation requirements. Certification documentation is available upon request to support customer supply chain audits.
SQ accepts OEM orders with custom branding, private-label carton and box design, and logo application. Sample runs are available before volume commitment. Non-standard dimensions and modified specifications are negotiable via direct technical inquiry. Products are exported to Southeast Asia, Europe, the Middle East, Africa, and South America through self-operated export licensing.
Frequently Asked Questions
Q1: What is the difference between SBR16UU and SBR16LUU?
The SBR16UU houses a single linear bearing, while the SBR16LUU is a long type linear motion block containing two LM16UU-OP open bearings in tandem. This doubles the bearing span, increasing load capacity and moment resistance - making the SBR16LUU the preferred choice where travel stability and anti-tipping rigidity are required.
Q2: Is the SBR16LUU compatible with standard 16mm SBR round rail systems?
Yes. The SBR16LUU open extended linear bearing block is designed to fit directly onto standard 16mm diameter SBR-type supported round rail assemblies. The open-bottom housing profile allows the block to clear the rail support bracket for full-stroke travel without modification.
Q3: What load capacity does the SBR16LUU support?
The SBR16LUU carries a dynamic load rating of 1,548 N and a static load rating of 2,360 N. For applications involving eccentric or cantilevered loads, the extended dual-bearing configuration provides additional moment resistance beyond what these ratings alone indicate.
Q4: Does SQ offer OEM or custom packaging for the SBR16LUU?
Yes. SQ accepts OEM arrangements including custom branding, private-label carton and box packaging, and logo application. Sample runs are available before volume commitment, and non-standard specifications can be discussed directly with the technical sales team.
Q5: What certifications does the SBR16LUU meet?
SBR16LUU linear motion blocks are manufactured under ISO 9001 certified quality management. SQ products have also passed ROHS and REACH compliance verification, supporting customers with European Union supply chain regulation requirements. Certification documentation is available upon request.
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