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Strong Dust-proof SFNU Series Ball Screw

Home · Products · Ball Screw · Strong Dust-proof SFNU Series Ball Screw
  • Strong Dust-proof SFNU Series Ball Screw
Strong Dust-proof SFNU Series Ball Screw

Strong Dust-proof SFNU Series Ball Screw

The SFNU series is a ball screw specifically designed to withstand harsh working conditions involving dust, debris, and liquid splashes. Based on the standard flanged SFU series, it integrates a highly efficient sealing and dustproof system to ensure the cleanliness of the internal raceway, thus maintaining high precision and long-term stable operation in complex environments. It is an ideal transmission choice for highly reliable automation equipment.

Inquiry
PREV: High Speed Low Noise SFS Series Ball Screw Next: Flange Type SFU Series Ball Screw

Technology

The true value of the SFNU series lies in its proactive defense design concept, which contrasts sharply with the protection capabilities of standard ball screws. Its core advantages are compared below

Characteristic Dimensions SFNU Series Heavy-Duty Dust-Proof Type Standard flange type (e.g. SFU series)
Core Strengths Exceptional environmental resilience, engineered for demanding operating conditions. Cost-effective, suitable for clean or general operating conditions.
Protection Capability Multi-stage sealing system (typically incorporating contact scraper seals + labyrinth non-contact seals) effectively blocks ingress of dust, debris and liquids. Equipped only with basic dust seals, offering limited protection.
Operational Reliability Internal raceways maintain high cleanliness, with grease remaining uncontaminated for stable, reliable long-term operation and low failure rates. In dusty environments, susceptible to accelerated wear, increased noise or seizure due to contaminant ingress.
Service Life Under equivalent harsh conditions, service life is significantly extended with longer maintenance intervals. Service life significantly reduced in dusty conditions.
Maintenance Costs Substantially reduces unexpected downtime and replacement costs caused by environmental contaminants, delivering lower overall operating costs. May require more frequent cleaning, maintenance or replacement.
Applicable Scenarios Applications include woodworking machinery, stone processing, agricultural machinery, foundries, and outdoor equipment. Suitable for factory clean zones, laboratories, standard assembly lines, etc.

Main Technical Parameters and Design
Dustproof Structure: Typically uses a multi-layer end cap seal. The outermost layer is a scraper-type sealing ring that powerfully removes particles from the shaft surface; the inner layer is a labyrinth seal that blocks fine dust through a tortuous path.

Accuracy and Performance: Inherits the C7 standard accuracy of rolled ball screws, with high transmission efficiency (>90%). The dustproof design has no negative impact on motion smoothness and accuracy.

Specification Range: Provides common shaft diameters from φ12mm to φ50mm and various lead options. The nut flange dimensions are compatible with the standard SFU series, facilitating equipment upgrades and replacements.

Easy Installation: The integrated flange design allows for installation identical to standard flanged nuts, requiring no changes to the equipment's structural design.

Typical Application Scenarios
The SFNU series provides reliable transmission protection for industries facing contamination challenges, including:

Wood and Stone Processing: Sawing, carving, and grinding equipment, handling wood chips and stone dust.

Agriculture and Engineering Machinery: Outdoor mobile equipment such as seeders and fertilizer spreaders, providing protection against dust and moisture.

Food and Packaging Industry: Handling slightly corrosive powders such as sugar and starch.

General Automation: Automation units in factories near grinding, stamping, and other processes that generate debris.

The core value of the strong dust-proof SFNU Series Ball Screw is "providing protective armor for precision transmission." It is not just a transmission component, but a reliable solution for harsh working environments, effectively ensuring long-term stable operation of equipment under demanding conditions, fundamentally reducing maintenance costs and downtime risks.

Parameters

Model No. d l Da Dimension Load Rating Rigidity Weight
D A B L W H X Q n Ca(kgf) Coa(kgf) Kgf/μm Kg
SFNU1204-4 12  4  2.381  24  40  10  40  32  30  4.5  M6 1x4 902  1884  26  0.138 
SFNU1605-4  16  5  3.175  28  48  10  45  38  40  5.5  M6 1x4 1380  3052  32  0.19 
SFNU1610-3  10  3.175  28  48  10  57  38  40  5.5  M6 1x3 1103  2401  26  0.22 
SFNU2005-4  20  5  3.175  36  58  10  51  47  44  6.6  M6 1x4 1551  3875  39  0.316 
SFNU2505-4  25  5  3.175  40  62  10  51  51  48  6.6  M6 1x4 1724  4904  45  0.35 
SFNU2510-4  10  4.762  40  62  12  80  51  48  6.6  M6 1x4 2954  7295  50  0.484 
SFNU3205-4  32  5  3.175  50  80  12  52  65  62  9  M6 1x4 1922  6343  54  0.588 
SFNU3210-4  10  6.350  50  80  12  85  65  62  9  M6 1x4 4805  12208  61  0.832 
SFNU4005-4  40  5  3.175  63  93  14  55  78  70  9  M8 1x4 2110  7988  63  0.97 
SFNU4010-4  10  6.350  63  93  14  88  78  70  9  M8 1x4 5399  15500  73  1.246 
SFNU5010-4  50  10  6.350  75  110  16  88  93  85  11  M8 1x4 6004  19614  85  1.82 
SFNU6310-4  63  10  6.350  90  125  18  93  108  95  11  M8 1x4 6719  25358  99  2.576 
SFNU8010-4 80  10  6.350  105  145  20  93  125  110  13.5  M8 1x4 7346  31953  109  3.1 

Drawings


Production Capacity

Cyclone Milling Machines

LWN160-6000mm Leistritz Cyclone milling machines imported directly from
Germany, the ball screw shaft precision can be C3, C5, and C7 the max length
can be 7000mm

Rolled Thread CNC Machines

PR-40CNC Profiroll rolled thread ball screw machines imported directly from
Germany the ball screw shaft precision can be C5, C7 -C10

Rolled Thread CNC Machines

ST-20.2 and ST-347.7 rolled thread ball screw machines from TaiWan.
The ball screw shaft precision can be C7 - C10

Ball Screw Assembly Workshop

We conduct nut assembly in a constant temperature workshop,  all workers
having decades of work experience and zero clearance between the screw
and nut.

Ball Screw Assembly Workshop

One ball screw shaft matches one ball screw nut. Because each ball screw
shaft has a very tiny different tolerance. There are dozens of different
ball sizes for different screw shaft.
Our ball screw shaft and nut can be interchanged with the Taiwan
TBI ball screw shaft and nut very well.

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