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Strong Dust-proof SFNI Series Ball Screw

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  • Strong Dust-proof SFNI Series Ball Screw
Strong Dust-proof SFNI Series Ball Screw

Strong Dust-proof SFNI Series Ball Screw

The SFNI series ball screw is a comprehensively upgraded, fully protected version of the high-performance flanged type (SFI series). Building upon the excellent characteristics of the SFI series, such as high rigidity, high load capacity, and long lifespan, it integrates a higher-grade sealing and dustproof system.  This is designed to provide robust and reliable all-around transmission protection for demanding applications facing multiple challenges from dust, chips, and moisture, such as heavy-duty CNC machine tools, large-scale automated production lines, and outdoor heavy machinery.

Inquiry
PREV: Big Lead SFY Series Ball Screw Next: Flange Type SFI Series Ball Screw

Technology

The core value of the SFNI series lies in the powerful combination of "high performance" and "high protection." It is not simply a combination of features, but a systematic solution tailored for heavy-duty precision transmission, with overall performance far exceeding that of basic series.

Characteristic Dimensions SFNI Series (High-Performance Heavy-Dust Protection) Standard Heavy-Duty Dust-Proof Type (e.g. SFNU Series) High-performance flange type (SFI series)
Core Positioning The ultimate protection solution for heavy-duty precision transmission in harsh environments. Cost-effective environmental protection for general-purpose loads. Heavy-duty precision transmission, suitable for clean or controlled environments.
Load Capacity and Rigidity Exceptional. Based on SFI's high-rigidity design, it withstands heavy loads and high impact stresses. Standard load capacity meeting most universal requirements. Exceptional.
Protection Rating Superior. Utilises multi-composite sealing (e.g., metal wiper blades + multi-layer elastic sealing lips + labyrinth structure) to withstand heavy dust, long-fibre chips, and high-pressure coolant splashes. High. Effective protection against conventional dust and debris. Moderate. Typically standard protection, unsuitable for harsh environments.
Accuracy Retention Exceptional. Superior sealing maintains long-term internal lubricant cleanliness. Combined with high-performance design, it consistently preserves precision throughout its entire service life. Good. Superior to standard products in protected environments. Outstanding (in clean environments).
Reliability and Service Life In demanding conditions, it significantly outperforms other series in longevity and reliability, substantially reducing unplanned downtime risks and overall maintenance costs. Significantly extended service life under harsh operating conditions. Long (in clean environments).
Cost Positioning Premium. An investment in supreme performance and dependability. Economical with high value for money. Relatively high, representing a performance investment.

Dual Top-Tier Configuration
High-Performance Core:  Utilizes large-sized ball bearings, optimized Gothic arch raceways, and double-nut preloading designs to ensure high rigidity, high load capacity, and backlash-free transmission.
Robust Protection Shell: The sealing system is "armor-grade." It typically includes: an external replaceable metal scraper (to remove large particles), multiple internal elastic sealing lips (to block fine dust), and a labyrinth gap (to isolate and expel contaminants).
Accuracy Level: Typically offers C5 or higher precision grades to meet the high-precision machining requirements of heavy-duty machine tools.
Specifications and Service: Covers a range of shaft diameters from medium to extra-large. Often used as a critical component, it provides more comprehensive technical support and customized services (such as special lubrication and adaptation to extreme environments).

Application Scenarios
The SFNI series is the "heart" of the following top-tier industrial equipment when facing harsh working environments:
Heavy-duty CNC Machine Tools: Large vertical/horizontal machining centers, gantry milling machines, boring machines, dealing with metal chips and coolant.
Harsh Environment Automation: Precision transmission units in casting production lines, mining machinery, and building materials processing equipment.
Energy and Special Vehicles: Pitch control systems in wind turbines operating in dusty environments, and precision actuators in special engineering vehicles.
Any high-value equipment that prioritizes "extreme reliability" over cost.

The SFNI series heavy-duty dustproof ball screw is the answer to the demanding industrial challenges faced by ball screw technology. It represents a leap from "components" to "system solutions." Choosing the SFNI series means not only selecting a transmission component for your equipment, but also investing in "performance insurance" for your entire machine, protecting against environmental risks and ensuring continuous, efficient production. It's a crucial element in building top-tier equipment reliability and brand reputation.

Parameters

Model No. d I Da Dimension Load Rating Rigidity Weight
D A B L W H X Y Z Q n Ca(kgf) Coa(kgf) Kgf/um Kg
SFNI1605-4  16  5  3.175  30  49  10  45  39  34  4.5  8  4.5  M6 1x4 1380  3052  33  0.22 
SFNI1610-3 10  3.175  34  58  10  57  45  34  5.5  9.5  5.5  M6 1x3 1103  2401  27  0.382 
SFNI2005-4 20  5  3.175  34  57  11  51  45  40  5.5  9.5  5.5  M6 1x4 1551  3875  39  0.308 
SFNI2505-4 25  5  3.175  40  63  11  51  51  46  5.5  9.5  5.5  M8 1x4 1724  4904  45  0.396 
SFNI2510-4 10  4.762  46  72  12  80  58  52  6.5  11  6.5  M6 1x4 2954  7295  51  0.802 
SFNI3205-4 32  5  3.175  46  72  12  52  58  52  6.5  11  6.5  M8 1x4 1922  6343  52  0.472 
SFNI3210-4 10  6.35  54  88  15  85  70  62  9  14  8.5  M8 1x4 4805  12208  62  1.14 
SFNI4005-4 40  5  3.175  56  90  15  55  72  64  9  14  8.5  M8 1x4 2110  7988  59  0.84 
SFNI4010-4 10  6.35  62  104  18  88  82  70  11  17.5  11  M8 1x4 5399  15500  72  1.548 
SFNI5010-4 50  10  6.35  72  114  18  88  92  82  11  17.5  11  M8 1x4 6004  19614  83  1.924 
SFNI6310-4 63  10  6.35  85  131  22  93  107  95  14  20  13  M8 1x4 6719  25358  95  2.674 
SFNI8010-4 80  10  6.35  105  150  22  93  127  115  14  20  13  M8 1x4 7346  31953  109  3.9 

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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