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The LM Series Linear Bearing (often referred to as a linear ball bushing) is designed to slide smoothly along a linear shaft rather than rotating around it. The prefix "LM" denotes standard metric linear motion, while the "UU" suffix indicates that the bearing is equipped with rubber seals on both sides to prevent dust ingress and retain lubricant. Constructed with multiple internal ball circuits (typically 4 or more depending on size), these bearings ensure stable, low-noise translation across the shaft.
We carry a vast inventory of LM series bearings. Below are the most commonly requested sizes for the 3D printing and CNC industries:
Model | Inner Diameter (ID) | Outer Diameter (OD) | Length | Common Use Case |
LM6UU | 6 mm | 12 mm | 19 mm | Small robotics & test jigs |
LM8UU | 8 mm | 15 mm | 24 mm | RepRap / Prusa 3D Printers |
LM10UU | 10 mm | 19 mm | 29 mm | Desktop CNC routers |
LM12UU | 12 mm | 21 mm | 30 mm | Light automation mechanisms |
LM16UU | 16 mm | 28 mm | 37 mm | Heavy-duty slide systems |
LM20UU | 20 mm | 32 mm | 42 mm | Industrial CNC and packaging |
LM25UU | 25 mm | 40 mm | 59 mm | Factory automation |
LM30UU | 30 mm | 45 mm | 64 mm | Heavy-load linear guides |
Note: We manufacture inner diameters ranging from 3 mm up to 60 mm. Long-body variants (e.g., LM8LUU) are also available upon request.
To meet specific environmental demands and price points, we offer the LM series in multiple materials:
Carbon Steel: Economical option for basic DIY projects and light loads.
GCr15 Bearing Steel: The industry standard. Provides excellent wear resistance, long lifespan, and low noise (highly recommended).
Stainless Steel: Ideal for food-grade, medical, or corrosive environments.
Full Ceramic / Hybrid (Si3N4 / ZrO2): Used for extreme high-speed, high-temperature, or non-magnetic applications.
As a direct manufacturer, we provide reliable wholesale solutions for 3D printer kits, machinery builders, and regional distributors.
OEM/ODM Service: We can customize bearing seals, lubricants, and packaging to match your brand requirements.
Flexible Payment Terms: We accommodate international B2B trades with options including 100% T/T, 30% T/T advance with 70% against B/L copy, L/C at sight, Western Union, and PayPal.
Q1: What is the difference between LM8UU and LM8LUU?
A: The "UU" stands for standard length with double seals. The "LUU" denotes a "Long" body variant. For example, an LM8UU is 24 mm long, while an LM8LUU is 45 mm long. Long bearings are often used to increase shaft stabilization without needing to stack two separate bearings.
Q2: Should I lubricate these linear bearings before use?
A: Yes. While they come with a light anti-rust oil or base grease from the factory, it is highly recommended to pack the inner cavities (lubrication reservoirs) with a quality lithium grease or light machine oil before installing them onto the shaft to ensure ultra-smooth, long-lasting motion.
Q3: Can these bearings handle rotational movement?
A: No. Linear ball bearings (LM series) are designed strictly for linear sliding motion along a shaft. They cannot support rotational motion.
Q4: Do you sell the matching optical shafts and pillow blocks?
A: Yes. We can supply the matching hardened steel shafts (e.g., 8mm shafts for the LM8UU) as well as the aluminum pillow blocks (e.g., SCS8UU) that house these bearings. Let us know your complete bill of materials for a bundled quote.
The LM Series Linear Bearing (often referred to as a linear ball bushing) is designed to slide smoothly along a linear shaft rather than rotating around it. The prefix "LM" denotes standard metric linear motion, while the "UU" suffix indicates that the bearing is equipped with rubber seals on both sides to prevent dust ingress and retain lubricant. Constructed with multiple internal ball circuits (typically 4 or more depending on size), these bearings ensure stable, low-noise translation across the shaft.
We carry a vast inventory of LM series bearings. Below are the most commonly requested sizes for the 3D printing and CNC industries:
Model | Inner Diameter (ID) | Outer Diameter (OD) | Length | Common Use Case |
LM6UU | 6 mm | 12 mm | 19 mm | Small robotics & test jigs |
LM8UU | 8 mm | 15 mm | 24 mm | RepRap / Prusa 3D Printers |
LM10UU | 10 mm | 19 mm | 29 mm | Desktop CNC routers |
LM12UU | 12 mm | 21 mm | 30 mm | Light automation mechanisms |
LM16UU | 16 mm | 28 mm | 37 mm | Heavy-duty slide systems |
LM20UU | 20 mm | 32 mm | 42 mm | Industrial CNC and packaging |
LM25UU | 25 mm | 40 mm | 59 mm | Factory automation |
LM30UU | 30 mm | 45 mm | 64 mm | Heavy-load linear guides |
Note: We manufacture inner diameters ranging from 3 mm up to 60 mm. Long-body variants (e.g., LM8LUU) are also available upon request.
To meet specific environmental demands and price points, we offer the LM series in multiple materials:
Carbon Steel: Economical option for basic DIY projects and light loads.
GCr15 Bearing Steel: The industry standard. Provides excellent wear resistance, long lifespan, and low noise (highly recommended).
Stainless Steel: Ideal for food-grade, medical, or corrosive environments.
Full Ceramic / Hybrid (Si3N4 / ZrO2): Used for extreme high-speed, high-temperature, or non-magnetic applications.
As a direct manufacturer, we provide reliable wholesale solutions for 3D printer kits, machinery builders, and regional distributors.
OEM/ODM Service: We can customize bearing seals, lubricants, and packaging to match your brand requirements.
Flexible Payment Terms: We accommodate international B2B trades with options including 100% T/T, 30% T/T advance with 70% against B/L copy, L/C at sight, Western Union, and PayPal.
Q1: What is the difference between LM8UU and LM8LUU?
A: The "UU" stands for standard length with double seals. The "LUU" denotes a "Long" body variant. For example, an LM8UU is 24 mm long, while an LM8LUU is 45 mm long. Long bearings are often used to increase shaft stabilization without needing to stack two separate bearings.
Q2: Should I lubricate these linear bearings before use?
A: Yes. While they come with a light anti-rust oil or base grease from the factory, it is highly recommended to pack the inner cavities (lubrication reservoirs) with a quality lithium grease or light machine oil before installing them onto the shaft to ensure ultra-smooth, long-lasting motion.
Q3: Can these bearings handle rotational movement?
A: No. Linear ball bearings (LM series) are designed strictly for linear sliding motion along a shaft. They cannot support rotational motion.
Q4: Do you sell the matching optical shafts and pillow blocks?
A: Yes. We can supply the matching hardened steel shafts (e.g., 8mm shafts for the LM8UU) as well as the aluminum pillow blocks (e.g., SCS8UU) that house these bearings. Let us know your complete bill of materials for a bundled quote.
