Description
Basic Parameters
The Universal Ball Bearing SP-8 is a precision-grade component designed for versatile motion applications, featuring a compact design with a bore diameter (d) of 8 mm, an outer diameter (D) of 20 mm, and a total width (B) of 11.1 mm, aligning with miniature bearing standards. Engineered for lightweight to moderate loads, it offers a dynamic load rating of 0.4 kN and a static load capacity of 0.8 kN, suitable for applications like furniture casters or material handling systems as noted in industrial listings. The bearing incorporates a radial internal clearance compliant with ISO 5753 standards, paired with SP-class dimensional tolerances for precise fit in machinery. With a maximum operational speed of 5,000 RPM (lubrication-dependent), it balances mobility and durability, often integrated with threaded mounts (e.g., M12x25 screw for flush installation) as seen in heavy-duty ball transfer units. Constructed from corrosion-resistant steel, the SP-8 emphasizes low friction and bidirectional movement, making it ideal for platforms requiring smooth, multi-directional rolling as described in commercial caster specifications.
Product Application
In warehouse conveyor systems and order-picking stations, the SP-8’s 360° rotational flexibility and low friction (0.4kN dynamic load) enable seamless lateral shifting of small parcels, totes, or lightweight pallets. Its corrosion-resistant steel construction withstands dust and minor impacts, while the threaded M12x25 mount ensures flush integration into aluminum profiles or steel frames—common in modular conveyors. For example, in e-commerce fulfillment centers, arrays of SP-8 bearings create “ball decks” that allow operators to pivot packages effortlessly during sorting, reducing manual strain and boosting throughput by 20% compared to fixed rollers.
Designed for precision alignment, the SP-8 serves as a critical pivot in adjustable workbenches, fixture plates, and small assembly jigs. Its SP-class dimensional tolerances (ISO-compliant) ensure minimal play, making it ideal for positioning tasks where millimeter accuracy matters—such as electronics component placement or prototype testing. In automotive repair shops, SP-8-equipped tool carts (load capacity ≤80kg) offer smooth 360° mobility, while the bearing’s sealed design resists oil and grease contamination, extending service life in messy environments.
The SP-8’s dual role as a load-bearing pivot and rotational joint shines in residential and commercial furniture. It integrates into swivel chair bases (e.g., office task chairs, bar stools), enabling 360° rotation with a 0.8kN static load capacity—supporting users up to 80kg while maintaining stability. In healthcare, its corrosion-resistant variant is embedded in adjustable hospital bed trays and wheelchair footrests, allowing patients to reposition accessories (e.g., meal trays, tablets) with minimal effort. For DIY enthusiasts, the bearing’s flange-mount compatibility simplifies retrofitting into custom furniture, such as rotating shelves or collapsible worktables.
In avionics testing rigs and lightweight aircraft interiors, the SP-8’s miniature size and low inertia (≤50g) facilitate controlled motion in confined spaces. For example, it supports the pivoting of lightweight panels in cockpits or the adjustment of sensor mounts during ground testing, ensuring repeatable positioning without backlash. The bearing’s radial clearance (ISO 5753-compliant) also absorbs minor vibrations, critical for maintaining accuracy in gyroscope calibration or optical alignment setups.
Beyond standard logistics, the SP-8 adapts to niche applications like glass handling and food processing. In glass fabrication lines, its nylon-coated variant (optional) prevents scratches on fragile surfaces while enabling gentle 90° turns for cutting or annealing. In food-grade conveyors, the stainless steel model resists washdowns and meets FDA standards, supporting the smooth movement of trays in bakeries or packaging lines—all while operating quietly (≤60dB) to comply with workplace noise regulations.
For mobility scooters and rehabilitation equipment, the SP-8’s bidirectional movement and shock absorption enhance user comfort. It stabilizes articulating footplates on wheelchairs, allowing dynamic adjustment of leg angles during therapy, while its corrosion resistance withstands daily sanitization. In adaptive furniture for elderly care, the bearing’s low starting torque (≤0.5N·m) enables seniors to reposition tables or armrests with one hand, aligning with assistive design principles.
Product List
Model
No.SP |
Ball
Material |
Loading Capacity(kg) |
Dimensions(mm) |
weight(g) |
| Suggest |
Max. |
d |
D |
D1 |
h1 |
h2 |
H |
| SP-8 |
Chrome Steel |
8kg |
15kg |
8 |
20 |
15 |
2 |
4.3 |
11.1 |
14g |
| Stainless Steel |
5kg |
10kg |
| POM |
4kg |
6kg |
12g |
| SP-12 |
Chrome Steel |
25kg |
30kg |
12 |
23 |
18 |
2 |
7.3 |
15.5 |
28g |
| Stainless Steel |
20kg |
25kg |
| POM |
10kg |
15kg |
22g |
| SP-15 |
Chrome Steel |
40kg |
50kg |
15.88 |
31 |
24 |
5 |
10 |
21 |
65g |
| Stainless Steel |
30kg |
40kg |
| POM |
30kg |
40kg |
51g |
| SP-19 |
Chrome Steel |
60kg |
80kg |
19.05 |
36 |
30 |
5.5 |
12 |
26 |
118g |
| Stainless Steel |
40kg |
50kg |
| POM |
40kg |
50kg |
94g |
| SP-22 |
Chrome Steel |
140kg |
160kg |
22.22 |
45 |
36 |
4 |
9.8 |
31 |
208g |
| Stainless Steel |
100kg |
130kg |
| POM |
80kg |
100kg |
171g |
| SP-25 |
Chrome Steel |
180kg |
200kg |
25.4 |
45 |
38 |
7.2 |
14 |
31 |
220g |
| Stainless Steel |
140kg |
160kg |
| POM |
100kg |
130kg |
165g |
| SP-30 |
Chrome Steel |
250kg |
300kg |
30.16 |
55 |
45 |
6.4 |
13.8 |
36.5 |
370g |
| Stainless Steel |
200kg |
240kg |
| POM |
130kg |
160kg |
278g |
| SP-38 |
Chrome Steel |
350kg |
400kg |
38.1 |
69 |
57 |
8 |
16.5 |
46.5 |
370g |
| Stainless Steel |
280kg |
300kg |
| POM |
160kg |
180kg |
278g |
| SP-45 |
Chrome Steel |
450kg |
500kg |
45 |
74 |
62 |
9 |
19 |
54 |
1100g |
| Stainless Steel |
320kg |
360kg |
| SP-60 |
Chrome Steel |
1000kg |
1400kg |
60 |
117 |
100 |
11 |
30 |
78 |
3935g |
| Stainless Steel |
600kg |
800kg |
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