Details:
DLY SCM nuts are non-standard ball screw nuts designed for precision linear transmission systems. They work with matching ball screw shafts to convert rotary motion into accurate linear movement, making them suitable for equipment that requires compact installation, stable rigidity and reliable load support.
Unlike standard flange ball screw nuts such as SFU, SFA or SFE series, SCM nuts use a more compact cylindrical body structure without a large mounting flange. This makes the SCM series suitable for machine structures where the nut needs to fit inside a housing, sleeve, slider or customized mounting block.
SCM nuts are often selected for high-precision, high-rigidity and high-load applications where standard catalog nuts cannot fully match the available installation space or special assembly requirements. Common model options include SCM1605, SCM2005, SCM2505, SCM2510, SCM3205, SCM3210, SCM4005, SCM4010, SCM5005 and SCM5010.
For new machine design or replacement projects, the screw diameter, lead, ball diameter, nut outer diameter, nut length, oil hole position, wiper requirement, load rating and rigidity should match the machine structure. DLY can supply SCM nuts together with matching ball screw shafts, end machining and support units according to drawings, samples or application data.
Product Parameters
DLY SCM compact ball screw nuts are available in different shaft diameters, leads, ball diameters, nut body diameters, nut lengths, load ratings and rigidity levels. The SCM series is suitable for compact ball screw assemblies, customized mounting structures and replacement applications where a non-standard nut form is required.
The dimension drawing shows the main SCM nut structure, including screw diameter, nut body diameter, total length, shoulder length and oil hole position. The model table provides key data for selecting a suitable SCM nut according to installation space, axial load and required transmission stiffness.
SCM Series Ball Screw Nut Specifications
Unit: mm
| Model | Shaft Diameter d | Lead | Ball Diameter Da | Nut Diameter D | B | L | Q | L1 | n | Ca kgf | Coa kgf | K |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SCM1604-3 | 16 | 4 | 2.381 | 29 | 8 | 32 | - | - | 3 | 435 | 920 | 16 |
| SCM1605-3 | 16 | 5 | 3.175 | 28/32 | 16 | 50 | M6 | 6.5 | 4 | 765 | 1240 | 17 |
| SCM1605-4 | 16 | 5 | 3.175 | 28/32 | 16 | 56 | M6 | 6.5 | 4 | 980 | 1650 | 23 |
| SCM2005-3 | 20 | 5 | 3.175 | 36/38 | 16.5 | 59.5 | M6 | 7 | 3 | 860 | 1710 | 22 |
| SCM2005-4 | 20 | 5 | 3.175 | 36/38 | 16.5 | 59.5 | M6 | 7 | 4 | 1100 | 2280 | 28 |
| SCM2505-3 | 25 | 5 | 3.175 | 40/42 | 17 | 50 | M6 | 7 | 3 | 980 | 2300 | 32 |
| SCM2505-4 | 25 | 5 | 3.175 | 40/42 | 17 | 60 | M6 | 7 | 4 | 1250 | 3070 | 33 |
| SCM2510-3 | 25 | 10 | 4.762 | 40/42 | 17 | 80 | M6 | 10 | 3 | 1620 | 3205 | 26 |
| SCM2510-4 | 25 | 10 | 4.762 | 40/42 | 17 | 90 | M6 | 10 | 4 | 2070 | 4270 | 35 |
| SCM3205-4 | 32 | 5 | 3.175 | 50/52 | 19 | 60 | M6 | 7 | 4 | 1400 | 4080 | 41 |
| SCM3210-4 | 32 | 10 | 6.35 | 50/52 | 19 | 99/93 | M6 | 12 | 4 | 3340 | 7080 | 45 |
| SCM4005-4 | 40 | 5 | 3.175 | 63/58 | 19 | 55/59 | M8 | 6 | 4 | 1575 | 5290 | 49 |
| SCM4010-4 | 40 | 10 | 6.35 | 63/65 | 27 | 93/102 | M8 | 12 | 4 | 3850 | 9470 | 53 |
| SCM5005-4 | 50 | 5 | 3.175 | 65/75 | 19 | 55/65 | M8 | 6 | 4 | 1730 | 6763 | 60 |
| SCM5010-4 | 50 | 10 | 6.35 | 75/78 | 29 | 93/104 | M8 | 12 | 4 | 4390 | 12400 | 65 |
Ca refers to the basic dynamic load rating, Coa refers to the basic static load rating, and K refers to rigidity. Standard SCM nuts are supplied with wiper/scraper protection; versions without wipers can be specified according to the application requirement.
Product Features
Compact Non-Standard Nut Structure
SCM nuts are designed with a compact cylindrical body instead of a large external flange. This structure is suitable for ball screw assemblies installed inside limited mechanical space, including sleeves, housings, sliders and customized nut seats. For equipment designers, SCM nuts provide a practical option when a standard flange nut is too large or difficult to install.
High Rigidity for Stable Linear Transmission
The SCM series is suitable for motion systems that require stable axial transmission and controlled rigidity. Models with different circulation specifications, such as SCM1605-3 and SCM1605-4, provide different load ratings and rigidity values, allowing the nut to be matched with the expected load, speed and duty cycle.
Precision Movement with Low Backlash
SCM ball screw nuts use rolling contact between the screw shaft, steel balls and nut body to reduce friction and support smooth linear movement. With proper preload, lubrication and alignment, the nut can help maintain repeatable positioning performance in precision feed axes and customized linear motion systems.
Durable Heat-Treated Nut Body
DLY ball screw nuts are manufactured with suitable alloy steel materials and heat treatment processes according to the model and application requirement. A hardened raceway, stable dimensional control and smooth ball circulation help improve wear resistance, service life and operating reliability.
Oil Hole and Wiper Protection
SCM nuts include an oil hole position for lubrication arrangement, helping the ball screw assembly maintain smoother operation during repeated movement. Wiper or scraper protection helps reduce the entry of dust and particles, especially in CNC machines, automation equipment and production environments with fine debris.
Suitable for Custom Ball Screw Assemblies
SCM nuts are often used when the ball screw assembly requires a customized nut seat, special installation interface or non-standard replacement dimension. DLY can match the SCM nut with the corresponding ball screw shaft, end machining and support units according to the machine drawing or sample.
Application Scenarios
Compact CNC Feed Systems
SCM nuts can be used in CNC feed axes, engraving machines, machining centers and precision adjustment systems where the nut must be installed inside a compact structure. The cylindrical nut body is suitable for customized nut seats and space-limited feed assemblies.
Automation and Linear Motion Modules
In automated production equipment, SCM ball screw nuts can be used for positioning slides, transfer units, lifting modules, actuator structures and repeated linear motion mechanisms. The final model should be selected according to axial load, stroke, speed and available installation space.
Customized Machine Structures
SCM nuts are suitable for projects where a standard flange nut cannot fit the machine layout. They can be integrated into housings, sleeves, blocks or special brackets, making them useful for equipment upgrades, custom machine design and compact transmission mechanisms.
Precision Inspection and Measuring Equipment
Measuring devices, inspection platforms and fine adjustment mechanisms often require smooth movement and stable repeatability. SCM nuts can be applied in these systems when compact installation and controlled backlash are required.
Replacement and Maintenance Projects
SCM nuts are suitable for replacing worn or damaged non-standard ball screw nuts when the original machine uses a compact cylindrical nut structure. For replacement, DLY can confirm the model according to the screw diameter, lead, nut diameter, total length, oil hole position and sample dimensions.
FAQ
Q: What is an SCM ball screw nut?
A: An SCM ball screw nut is a compact, non-standard nut used with a matching ball screw shaft. It converts rotary motion into linear motion and is suitable for precision transmission systems where a standard flange nut is not suitable for the installation space.
Q: What is the main difference between SCM nuts and SFU nuts?
A: SFU nuts are standard flange-type ball screw nuts with a large mounting flange. SCM nuts use a compact cylindrical body and are more suitable for customized housings, sleeves, sliders and installation structures where flange space is limited.
Q: How do I choose between SCM1605-3 and SCM1605-4?
A: Both models are used with a 16 mm diameter, 5 mm lead ball screw, but their load rating, rigidity and nut length are different. SCM1605-4 provides higher dynamic and static load ratings than SCM1605-3, while the final choice should match the load, space and required rigidity of the machine.
Q: Can SCM nuts be used for high-load applications?
A: Yes. SCM nuts are suitable for high-rigidity and high-load ball screw applications when the model is selected according to the required axial load, rigidity, speed and duty cycle. Larger models such as SCM3210, SCM4010 and SCM5010 provide higher load ratings for heavier transmission requirements.
Q: Do SCM nuts have wipers?
A: Standard SCM nuts are supplied with wiper or scraper protection. If the equipment requires a nut without wipers, this can be specified during model confirmation according to the application and installation space.
Q: What information is needed for SCM nut selection?
A: Useful information includes screw diameter, lead, nut outer diameter, nut length, shoulder size, oil hole position, axial load, speed, accuracy requirement, installation space and current machine drawing or sample photos.
Q: Can DLY supply SCM nuts with matching ball screw shafts?
A: Yes. DLY can supply SCM nuts together with matching ball screw shafts, end machining, support units and related linear motion components according to drawings, samples or application requirements.
Need Help Selecting an SCM Ball Screw Nut?
Send DLY your screw diameter, lead, nut dimensions, installation space, axial load or existing drawing. Our team can help confirm the suitable SCM nut model and matching ball screw assembly for your equipment.
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