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SDM-UU/SDM-AJ-UU/SDM-OP-UU Steel Cage Linear Bearing

Home · Products · Linear Bearing · SDM-UU/SDM-AJ-UU/SDM-OP-UU Steel Cage Linear Bearing

SDM-UU/SDM-AJ-UU/SDM-OP-UU Steel Cage Linear Bearing

The SDM-UU/SDM-AJ-UU/SDM-OP-UU steel cage linear bushing is a product with key upgrades based on the standard SDM series. Its core feature is the use of a "steel retainer" (metal cage) instead of the common engineering plastic retainer. This improvement significantly enhances the bearing's performance under demanding conditions such as high speed, high temperature, heavy load, and long service life requirements. It is a highly reliable linear motion solution designed for industrial automation, machine tool accessories, and high-end equipment.

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Technology

The SDM-UU/SDM-AJ-UU/SDM-OP-UU steel cage linear bushing inherits the functional distinctions of the standard series while offering superior overall performance due to its "steel retainer" design.

Product Features	SDM-UU (Steel Retainer Standard Type)	SDM-AJ-UU (Adjustable Steel-Lined Type)	SDM-OP-UU (Steel-cased Open Type)	Core Selection Logic
Core Positioning	A standard-type bushing designed for high-speed, heavy-duty applications and extended service life.	A high-precision, zero-backlash, adjustable bushing designed for harsh environments.	A specialised bushing designed to prevent rotation, withstand vibration and offer high installation tolerance.	When standard models fail to meet performance requirements, upgrade to the Gangbao series; then select the UU, AJ or OP model based on functional requirements.
Core Advantages (Steel Protection Features)	1. Higher rotational speeds: The high strength of the steel retainer minimises the effects of centrifugal force, allowing for higher DN values. 2. High-temperature resistance: Suitable for environments with higher operating temperatures (e.g. near machine tools). 3. Longer service life: Superior wear resistance, resistance to ageing, and improved grease retention.	Building upon all the advantages of the Steel-Sealed series, this model incorporates a zero-backlash adjustment function to achieve high precision and rigidity at high speeds.	Building on all the advantages of the steel-cased design, it resolves issues of installation looseness and bushing rotation, making it suitable for high-speed, high-vibration environments.	The Gangbao series forms the foundation of performance, whilst the AJ and OP models offer functional extensions.
Key Structure and Functions	Integral flanged bushing with a steel cage to guide ball circulation.	Side adjustment screws are integrated into the Steel-Sealed structure, allowing for fine-tuning of the internal axial clearance.	Featuring a Steel-Bound construction, the outer sleeve has an axial opening which is tightened using flange screws to achieve radial locking and anti-rotation.	The structure determines core functionality, whilst the material determines the upper limit of performance.
Upgraded Applications	Replaces plastic cage models for applications requiring higher speeds and longer maintenance-free intervals.	Suitable for high-speed precision feeding and high-frequency forward/reverse operations where zero backlash is required, such as machine tool tool magazines and spindle feed systems.	Designed for high-speed, high-vibration environments (such as near stamping or forging lines) where absolute reliability of the guiding components is required.	Upgrade from ‘functional’ to ‘user-friendly, durable and reliable’.
Cost Positioning	A step up from the standard plastic cage model, representing an investment in performance.	Superior to standard adjustable types, representing an investment in top-tier performance.	A step up from the standard open type, representing an investment in exceptional reliability and performance.	Pay for harsher operating conditions and higher reliability

Technical Details and Value
1. Materials and Process: The retainer is made of high-quality steel plate, stamped and formed, and undergoes precision machining and surface treatment to ensure a smooth and unobstructed ball circulation path.
2. Performance Improvement Principle:
High Speed Capability: The strength and rigidity of steel are far superior to plastic, effectively suppressing retainer deformation and resonance during high-speed rotation, preventing ball jamming or accelerated wear.
Heat Resistance: It can withstand higher continuous operating temperatures (typically 20-40°C higher than plastic retainers), and the lubricant is less prone to leakage or oxidation.
Durability: There are virtually no problems with aging, creep, or chemical reactions with certain lubricants, resulting in excellent dimensional stability and more reliable life prediction.
3. Selection Recommendations: Consider the steel retainer series when your application involves the following conditions:
High motion speed (linear speed > 1 m/s or high-speed reciprocating motion).
High ambient temperature or thermal radiation.
Long equipment design life, aiming to minimize maintenance and replacement.
Heavy load or impact.

Applications
SDM-UU (steel cage): High-speed packaging machinery, automated logistics sorting lines, auxiliary axes of CNC machine tools.
SDM-AJ-UU (steel cage): Tool changer mechanisms of machining centers, non-core feed axes of precision electric spindles, high-dynamic testing equipment.
SDM-OP-UU (steel cage): Engine test benches, sheet metal stamping automation units, guiding supports for vibratory conveying equipment. The SDM-UU/SDM-AJ-UU/SDM-OP-UU steel cage linear bushing represents the evolution of linear bushing bearings from "general consumer products" to "critical industrial components." Through a core material upgrade (steel retainer), it elevates the product's speed limit, temperature adaptability, and service life to new heights.
Choosing this series means you are addressing and committed to solving the performance bottlenecks of conventional components in demanding industrial environments. It is not only a guide for linear motion but also a reliable foundation for ensuring the high-speed, stable, and continuous operation of entire production lines or high-end equipment.

_Parameters

Nominal shaft diameter (Inch/mm)	Part Number	Part Number								dr
	SDM	Ball circuit	weight(g)	SDM-AJ	ball circuit	weight(g)	SDM-OP	Ball circuit	weight(g)	mm	Tolerance(μm)
	SDM	Ball circuit	weight(g)	SDM-AJ	ball circuit	weight(g)	SDM-OP	Ball circuit	weight(g)	mm	Precision	High
6	SDM6-UU	4	8.5	-	-	-	-	-	-	6	0-6	0-9
8	SDM8S-UU	4	11	-	-	-	-	-	-	8	0-6	0-9
8	SDM8-UU	4	17	-	-	-	-	-	-	8	0-6	0-9
10	SDM10-UU	4	36	-	-	-	-	-	-	10	0-6	0-9
12	SDM12-UU	4	42	SDM12-AJ-UU	4	41	SDM12-OP-UU	3	32	12	0-6	0-9
13	SDM13-UU	4	49	SDM13-AJ-UU	4	48	SDM13-OP-UU	3	37	13	0-6	0-9
16	SDM16-UU	4	76	SDM16-AJ-UU	4	75	SDM16-OP-UU	3	58	16	0-6	0-9
20	SDM20-UU	5	100	SDM20-AJ-UU	5	98	SDM20-OP-UU	4	79	20	0-7	0-10
25	SDM25-UU	6	240	SDM25-AJ-UU	6	237	SDM25-OP-UU	5	203	25	0-7	0-10
30	SDM30-UU	6	270	SDM30-AJ-UU	6	262	SDM30-OP-UU	5	228	30	0-7	0-10
35	SDM35-UU	6	425	SDM35-AJ-UU	6	420	SDM35-OP-UU	5	355	35	0-8	0-12
40	SDM40-UU	6	654	SDM40-AJ-UU	6	640	SDM40-OP-UU	5	546	40	0-8	0-12
50	SDM50-UU	6	1700	SDM50-AJ-UU	6	1680	SDM50-OP-UU	5	1420	50	0-8	0-12
60	SDM60-UU	6	2000	SDM60-AJ-UU	6	1980	SDM60-OP-UU	5	1650	60	0-9	0-15
80	SDM80-UU	6	4520	SDM80-AJ-UU	6	4400	SDM80-OP-UU	5	3750	80	0-9	0-15
100	SDM100-UU	6	8600	SDM100-AJ-UU	6	8540	SDM100-OP-UU	5	7200	100	0-10	0-20
120	SDM120-UU	8	15000	SDM120-AJ-UU	8	14900	SDM120-OP-UU	6	11600	120	0-10	0-20
150	SDM150-UU	8	20250	SDM150-AJ-UU	8	20150	SDM150-OP-UU	6	15700	150	0-13	0-25

Major dimensions and tolerance											Eccentrcity		Radial clearan- ce(Max) μm	Basic load rating		Nominal shaft diameter (mm)
D		L		B		W	D1	h	h1	θ	Eccentrcity			dynamic (CN)	static (Co N)
mm	Tolerance(μm)	mm	Tolerance(μm)	mm	Tolerance(μm)	mm	mm	mm	mm	θ	Tolerance(μm)	High(μm)		dynamic (CN)	static (Co N)
12	0-11	19	0-200	13.5	0-200	1.1	11.5	-	-	-	8	12	-3	206	265	6
15	0-11	17	0-200	11.5	0-200	1.1	14.3	-	-	-	8	12	-3	176	216	8
15	0-11	24	0-200	17.5	0-200	1.1	14.3	-	-	-	8	12	-3	274	392	8
19	0-13	29	0-200	22	0-200	1.3	18	-	-	-	8	12	-4	372	549	10
21	0-13	30	0-200	23	0-200	1.3	20	1.5	8	80°	8	12	-4	510	784	12
23	0-13	32	0-200	23	0-200	1.3	22	1.5	9	80°	8	12	-4	510	784	13
28	0-13	37	0-200	26.5	0-200	1.6	27	1.5	11	80°	8	12	-6	774	1180	16
32	0-16	42	0-200	30.5	0-200	1.6	30.5	1.5	11	60°	10	15	-6	882	1370	20
40	0-16	59	0-300	41	0-300	1.85	38	2	12	50°	10	15	-6	980	1570	25
45	0-16	64	0-300	44.5	0-300	1.85	43	2.5	15	50°	10	15	-8	1570	2740	30
52	0-19	70	0-300	49.5	0-300	2.1	49	2.5	17	50°	12	20	-8	1670	3140	35
60	0-19	80	0-300	60.5	0-300	2.1	57	3	20	50°	12	20	-10	2160	4020	40
80	0-19	100	0-300	74	0-300	2.6	76.5	3	25	50°	12	20	-13	3820	7940	50
90	0-22	110	0-300	85	0-300	3.15	86.5	3	30	50°	17	25	-13	4700	10000	60
120	0-22	140	0-400	105.5	0-400	4.15	116	3	40	50°	17	25	-20	7350	16000	80
150	0-25	175	0-400	125.5	0-400	4.15	145	3	50	50°	20	30	-20	14100	34800	100
180	0-25	200	0-400	158.6	0-400	4.15	175	3	85	80°	20	30	-25	16400	40000	120
210	0-29	240	0-400	170.6	0-400	5.15	204	3	105	80°	25	40	-25	21100	54300	150