LM20UU Standard Sealed Linear Motion Ball Bearing 20x32x42mm Double Rubber UU Seals

LM20UU is standard closed cylindrical linear motion ball bearing, standard metric dimension 20mm inner bore × 32mm outer diameter × 42mm overall length.

Suffix Code Explanation:

• LM: Metric standard straight linear ball bushing series
• 20: Nominal inner bore size 20mm, matched with 20mm hardened linear shaft
• UU: Double-sided integrated contact rubber seal, pre-filled anti-wear lithium grease, block dust, debris and light splash moisture to keep internal ball circulation clean

Adopts 5 groups of circulating steel ball circuits, polyamide plastic retainer evenly separates steel balls for stable low-noise reciprocating linear motion. Thickened chrome bearing steel outer shell after overall quenching and precision internal grinding, uniform radial load distribution, low friction coefficient without clearance gap. Widely matched with linear optical shafts for CNC machine tools, 3D printers, automatic packaging equipment, robotic slide units, textile automation equipment, medical precision transmission devices and all medium-load reciprocating linear motion systems.

Mounting dimension drawings, linear shaft matching tolerance guide and friction durability test reports can be provided on customer request.

1. Double-sided UU full rubber sealing structure, dual barrier protection, effectively isolate workshop dry dust, plastic powder and light water splash, reduce frequent maintenance and extend service life.
2. 5-circulation steel ball layout, uniform load bearing, smooth reciprocating sliding with ultra-low friction, no jamming during high-speed repeated linear movement.
3. High hardness quenched GCr15 steel outer shell and rolling balls, stable dimensional accuracy, good wear resistance, long service life under continuous medium cyclic load.
4. Integrated polyamide retainer with low noise design, buffer ball collision vibration, stable and quiet operation for precision automation equipment.
5. Standard metric interchangeable overall dimension, fully compatible with global LM20UU linear bearings, directly replaced without modifying bearing housing and shaft installation structure.
6. Closed solid cylindrical structure, preset standard internal clearance, convenient direct press-fit installation into bearing housing without clearance adjustment operation.
7. Pre-filled long-life industrial lithium grease from factory, ready to use out of package, suitable for long-term unattended automatic production line operation.
8. Rich customizable options: P0/P6 precision grade, stainless steel body upgrade, open OP / adjustable AJ variant conversion, OEM laser marking, neutral export anti-rust carton packaging, food-grade lubricant filling.

LM20UU sealed closed linear ball bearing is compact medium-load linear motion spare part matched with 20mm hardened optical shaft:

• Desktop CNC engraving machine, laser cutting machine slide transmission assemblies
• FDM 3D printer X/Y/Z axis moving guide supporting positions
• Automatic packaging, labeling and filling machine linear sliding units
• Small industrial robot, gantry manipulator reciprocating moving parts
• Textile weaving automation, winding machine light load linear guide sets
• Medical testing equipment, laboratory precision sliding transmission mechanisms

Aftermarket interchangeable LM series metric linear motion ball bushing

Low-cost smooth linear sliding bearing solution for CNC equipment manufacturers, 3D printer OEM factories and automation production line bulk maintenance procurement.

We have 25 years of mature professional manufacturing experience for LM series metric sealed linear ball bearings including LM20UU double UU seal closed models.

Our LM20UU linear bearings adopt unified international standard metric dimensions, consistent dynamic/static load parameters, ball circulation grinding precision and UU sealing assembly tolerance standards, fully dimensionally interchangeable with global standard brand linear bushings.

Complete OEM & ODM customized service system, supporting multi-precision grades, stainless steel material upgrading, open/adjustable structure transformation and personalized marking demands.

Strict pre-delivery full quality inspection flow: GCr15 raw material composition and hardness test, steel ball automatic sorting screening, long-cycle high-speed reciprocating friction aging test, double-side sealing tightness full batch inspection.

Professional linear motion bearing technical team provides one-to-one load matching calculation, linear shaft-housing fit tolerance guidance and regular relubrication maintenance tips within 24 working hours.

Standardized precision linear bearing production workshop provides competitive factory direct bulk wholesale price, stable long-term mass supply for global CNC, 3D printing and automation machinery spare parts purchasers.

We specialize in UU sealed standard linear ball bushings, strict internal raceway super grinding quality control and ISO standard interchangeable dimensions, committed to long-term stable win-win cooperation with precision linear transmission equipment suppliers.

• Raw material chemical composition, internal crack defect and hardness inspection for GCr15 steel outer shell and steel ball blanks
• Precision turning forming processing, overall quenching & multiple stress relief tempering cycles, ultra-precision internal hole superfinishing grinding for linear raceway surfaces
• Steel ball mirror polishing and high-precision automatic sorting production line
• Reinforced polyamide retainer injection molding forming, 5-circulation ball assembly gap inspection
• Double-sided UU rubber seal pressing installation, factory quantitative pre-lubrication grease filling procedure
• Targeted professional performance testing: LM20UU long cycle high-speed reciprocating friction aging test, dust erosion sealing durability simulation test, radial load deformation detection
• Comprehensive re-inspection of overall dimensional tolerance, inner bore roundness and sealing tightness before anti-rust oil coating and export moisture-proof carton packaging.

Each production batch of LM20UU linear bearings undergoes CNC slide reciprocating cycle simulation test to guarantee stable low-friction dust-proof linear sliding performance for 20mm shaft precision automation transmission systems.

If you need LM20UU 20x32x42 double UU sealed closed linear ball bearings for CNC / 3D printer manufacturing, automation slide assembly and packaging equipment maintenance bulk matching, send your purchase demand directly.

Complete professional one-stop supporting services after sending inquiry:

• Formal official detailed quotation reply within 24 working hours
• One-to-one radial load matching calculation, linear shaft-housing fit tolerance and relubrication maintenance technical support provided by professional linear bearing engineers
• Customized bearing performance upgrade options including stainless steel body, open OP type conversion and food-grade lubricant filling
• Favorable factory direct bulk wholesale price for large quantity single model orders of LM20UU

Please provide purchase quantity, actual working conditions (high-speed reciprocating / dusty workshop / light splash environment) to obtain complete official quotation documents.