DLY Ordinary Round Hole SFU Nuts are flange-type ball screw nuts used in ball screw drive systems. Compared with waist-shaped mounting hole SFU nuts, this version uses ordinary round mounting holes on the flange, making it suitable for standard fixed-position installation where the machine mounting plate has already been machined accurately.
The nut structure includes an internal circulation design, single nut body, circular ball return structure and Gothic groove raceway. It is commonly matched with SFU series ball screws for CNC equipment, automation axes, positioning tables, packaging machinery and other linear transmission systems.
Product Introduction
The ordinary round hole SFU nut is a standard flange ball nut designed for converting rotary motion of a ball screw into precise linear motion. The round holes on the flange are used for direct bolt mounting, allowing the nut to be fixed to a machine table, slide plate or actuator carriage.
This product is suitable when the installation hole positions are fixed and do not require additional lateral adjustment. If the mounting position needs a small amount of adjustment during assembly, a waist-shaped SFU nut may be checked separately. For standard mounting plates and repeat production equipment, the ordinary round hole type provides simple installation and stable positioning.
Main Structure of Ordinary Round Hole SFU Nuts
Round Flange Mounting Holes
The flange is designed with ordinary round mounting holes for bolt connection. This structure is suitable for machines where the mounting hole position has been confirmed by drawing or machining. It helps keep the nut installation straightforward and repeatable.
Single Nut Design
The SFU ordinary round hole nut uses a single nut body. It is widely used in standard ball screw assemblies where compact size, stable movement and convenient installation are required.
Internal Circulation and Circular Return Structure
The steel balls circulate inside the nut through the return structure, allowing rolling contact between the screw shaft and the nut raceway. This reduces friction compared with sliding transmission and supports smoother linear movement.
Gothic Groove Raceway
The Gothic groove raceway helps improve contact stability between the ball and the raceway. For applications requiring better positioning and rigidity, the ball screw shaft, nut accuracy, preload condition and installation alignment should be confirmed together.
Available Models
DLY supplies ordinary round hole SFU nuts for common SFU ball screw sizes. The model code normally reflects screw diameter, lead and circulation specification. When ordering a replacement nut, the complete model should be checked together with the screw shaft size and flange dimensions.
| Model Group | Available Examples | Selection Focus |
|---|---|---|
| Small SFU nuts | SFU1204-3, SFU1605-3, SFU1605-4, SFU1610-2/2, SFU1610-3/2 | Compact linear modules, light automation axes and limited installation space. |
| Medium SFU nuts | SFU2005-3, SFU2005-4, SFU2010-2/2, SFU2010-3/2, SFU2505-3, SFU2505-4, SFU2510-4/2, SFU2510-4 | General CNC axes, packaging equipment and standard automation transmission. |
| Large SFU nuts | SFU3205-4, SFU3210-4, SFU4005-4, SFU4010-4, SFU5005-4, SFU5010-4 | Larger machine tables, longer stroke axes and higher axial load requirements. |
| Heavy-size SFU nuts | SFU6310-4, SFU6320-4, SFU8010-4, SFU8010-6, SFU8020-4 | Heavy-duty linear transmission and large equipment requiring stronger screw and nut support. |
Cylindrical Grinding Parameter Reference
The outer circle of the nut is controlled during cylindrical grinding. These reference values help confirm the nut body size and machining tolerance for different SFU models.
| Model | Outer Circle of Nut | Tolerance |
|---|---|---|
| SFU1204-3 | 24 / 22 | -0.009 ~ -0.019 |
| SFU1605-3 | 28 | -0.009 ~ -0.019 |
| SFU1605-4 | 28 | -0.009 ~ -0.019 |
| SFU1610-2/2 | 28 | -0.009 ~ -0.019 |
| SFU1610-3/2 | 28 | -0.009 ~ -0.019 |
| SFU2010-2/2 | 36 | -0.012 ~ -0.022 |
| SFU2010-3/2 | 36 | -0.012 ~ -0.022 |
| SFU2005-3 | 36 | -0.012 ~ -0.022 |
| SFU2005-4 | 36 | -0.012 ~ -0.022 |
| SFU2505-3 | 40 | -0.012 ~ -0.022 |
| SFU2505-4 | 40 | -0.012 ~ -0.022 |
| SFU2510-4/2 | 40 | -0.012 ~ -0.022 |
| SFU2510-4 | 40 | -0.012 ~ -0.022 |
| SFU3205-4 | 50 | -0.015 ~ -0.025 |
| SFU3210-4 | 50 | -0.015 ~ -0.025 |
| SFU4005-4 | 63 | -0.015 ~ -0.025 |
| SFU4010-4 | 63 | -0.015 ~ -0.025 |
| SFU5005-4 | 75 | -0.015 ~ -0.025 |
| SFU5010-4 | 75 | -0.015 ~ -0.025 |
| SFU6310-4 | 90 | -0.018 ~ -0.028 |
| SFU6320-4 | 95 | -0.018 ~ -0.028 |
| SFU8010-4 | 105 | -0.021 ~ -0.031 |
| SFU8010-6 | 105 | -0.021 ~ -0.031 |
| SFU8020-4 | 125 | -0.021 ~ -0.031 |
Manufacturing Process
The ordinary round hole SFU nut is produced through a controlled machining and finishing process. Each step affects the final mounting accuracy, raceway quality and running performance of the nut.
Raw material → rough turning → finish turning → drilling and milling H-surface → small hole tapping → finish turning → quenching → cylindrical grinding → raceway grinding → assembly
Fine Turning and Hole Machining Details
During fine turning, the flange end face, chamfer, flange outer circle and dust ring position are machined to support accurate assembly. Key dimensions such as overall length, flange thickness and flange outer circle are controlled before grinding and assembly.
| Machining Item | Control Point | Purpose |
|---|---|---|
| Overall length | L +0.05 | Helps maintain correct nut length for assembly space. |
| Flange thickness | B ±0.05 | Supports stable flange mounting and bolt tightening. |
| Flange outer circle | ±0.05 | Improves dimensional consistency for machine installation. |
| Oil hole for SFU1204–SFU3210 | 5.2Z drill bit, M6 oil hole | Supports lubrication access for small and medium models. |
| Oil hole for SFU4005–SFU8020 | 6.8 drill bit, M8 oil hole | Supports lubrication access for larger models. |
Product Performance
Accurate Linear Positioning
The nut is matched with an SFU ball screw shaft to support controlled linear positioning. For applications such as CNC axes and automation systems, screw lead accuracy, nut clearance, mounting alignment and support bearing arrangement should be checked together.
Rolling Transmission Efficiency
Steel balls roll between the screw and nut raceway, reducing friction resistance during movement. This rolling structure helps improve transmission efficiency and reduces the driving load compared with sliding screw mechanisms.
Stable Flange Mounting
The ordinary round hole flange is suitable for fixed mounting positions. Once the machine plate hole pattern is confirmed, the nut can be bolted directly to the moving table or carriage, helping maintain repeatable installation.
Smooth Running with Proper Lubrication
The ball nut should be lubricated according to the machine operating condition. Correct lubrication helps protect the ball circulation path, reduce wear and keep the ball screw assembly running smoothly during repeated motion.
Typical Applications
Ordinary round hole SFU nuts are suitable for ball screw assemblies where a standard flange nut is required and the mounting hole position is already defined. They are used in many linear transmission systems that require stable positioning and repeated movement.
How to Confirm the Correct SFU Nut
The ordinary round hole SFU nut should be confirmed according to the screw diameter, lead, nut model, flange hole layout and installation space. For replacement projects, photos of the original nut marking and measurements of the mounting holes are useful.
| Item to Confirm | Example |
|---|---|
| Nut model | SFU1605-3, SFU2005-4, SFU2510-4 |
| Mounting hole type | Ordinary round hole |
| Ball screw shaft | Matched SFU screw shaft |
| Lubrication hole | M6 or M8 according to model range |
| Assembly requirement | Nut only or complete ball screw assembly |
Ordinary Round Hole SFU Nut or Waist-Shaped SFU Nut?
Both types belong to the SFU flange ball nut series. The main difference is the flange mounting hole form. The ordinary round hole type is better for fixed-position installation, while the waist-shaped hole type is more convenient when slight mounting adjustment is needed during assembly.
| Type | Mounting Hole | Suitable Situation |
|---|---|---|
| Ordinary round hole SFU nut | Round flange holes | Fixed mounting hole position, standard machine plate, repeat production assembly. |
| Waist-shaped SFU nut | Elongated mounting holes | Installation requiring small position adjustment or easier alignment during assembly. |
DLY Production and Quality Support
DLY produces ball screws, ball nuts, linear guideways, linear shafts and related linear motion components. For SFU ordinary round hole nuts, DLY can support model confirmation, machining check, nut-and-screw matching, end machining coordination and export packaging.
Before shipment, model, appearance, mounting holes, lubrication hole, raceway condition and assembly compatibility can be checked according to order requirements. For custom or replacement orders, drawings and samples help reduce the risk of mismatch.
FAQ
Q: What is an ordinary round hole SFU nut?
A: It is a flange-type SFU ball screw nut with ordinary round mounting holes on the flange. It is used with an SFU ball screw shaft to form a linear transmission system.
Q: What is the difference between ordinary round hole and waist-shaped SFU nuts?
A: The ordinary round hole type uses fixed round mounting holes, while the waist-shaped type uses elongated holes. Round holes are suitable for accurate fixed mounting, and waist-shaped holes are more convenient when slight installation adjustment is needed.
Q: Can I replace only the SFU nut without replacing the ball screw?
A: It depends on the screw shaft condition. If the screw raceway is worn or damaged, replacing only the nut may not restore smooth movement or accuracy. Photos, model markings and actual measurements are recommended before replacement.
Q: Which models use M6 or M8 oil holes?
A: For the listed DLY process reference, SFU1204 to SFU3210 use an M6 oil hole, while SFU4005 to SFU8020 use an M8 oil hole. The final specification should be confirmed by model and drawing.
Q: What information is needed for quotation?
A: Please provide the SFU nut model, screw diameter and lead, mounting hole type, quantity, application and whether you need the nut only or a complete ball screw assembly. A drawing or sample photo is helpful for replacement projects.
Contact DLY for Ordinary Round Hole SFU Nuts
Send your required SFU nut model, screw size, mounting hole type, quantity and application. DLY can help confirm whether the ordinary round hole SFU nut is suitable for your ball screw assembly.
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