{"id":3473,"date":"2026-07-08T05:14:21","date_gmt":"2026-07-08T05:14:21","guid":{"rendered":"https:\/\/rigid-shaft-coupling.top\/product\/sts7-25-stainless-steel-setscrew-rigid-coupling-25mm-od-316ss-mid-range-precision-shaft-connector\/"},"modified":"2026-07-08T09:27:24","modified_gmt":"2026-07-08T09:27:24","slug":"sts7-25-stainless-steel-setscrew-rigid-coupling-25mm-od-316ss-mid-range-precision-shaft-connector","status":"publish","type":"product","link":"https:\/\/rigid-shaft-coupling.top\/ko\/product\/sts7-25-stainless-steel-setscrew-rigid-coupling-25mm-od-316ss-mid-range-precision-shaft-connector\/","title":{"rendered":"STS7-25 Stainless Steel Setscrew Rigid Coupling \u2013 25mm OD 316SS Mid-Range Precision Shaft Connector"},"content":{"rendered":"
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STS7-25 Stainless Steel Setscrew Rigid Coupling \u2013 25 mm OD 316SS Mid-Range Precision Shaft Connector<\/h1>\n

The STS7-25<\/strong> is the 316 stainless steel equivalent of the TS7-25 aluminum alloy model, offering the same 25 mm outer diameter, 38 mm length, bore range of 8 to 12 mm, and 1 N\u00b7m nominal torque rating in a corrosion-resistant material body. The M4 setscrew thread and 1.7 N\u00b7m tightening torque are retained from the aluminum version. Where the TS7-25 is the standard choice for indoor, low-humidity precision automation, the STS7-25 is specified when the application environment introduces chloride, solvent, steam, or salt-spray exposure that would degrade an aluminum alloy body over time.<\/p>\n

The mass of the STS7-25 is 100 g \u2014 approximately 2.6 times that of the 39 g TS7-25 \u2014 and the moment of inertia increases to 7.1 \u00d7 10\u207b\u2076 kg\u00b7m\u00b2. For standard servo axis designs in the 200\u2013500 W motor range, this inertia contribution remains well within typical servo amplifier stability margins. The STS7-25 is used across food packaging OEM machines, pharmaceutical process equipment, chemical industry automation, and marine instrument drives \u2014 wherever the 8\u201312 mm bore range and 1 N\u00b7m torque class are required in a corrosion-resistant coupling.<\/p>\n

For a complete side-by-side comparison of the TS7-25 and STS7-25 with all other series models, visit our product catalog<\/a>.<\/p>\n

Technical Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Model<\/td>\nSTS7-25<\/td>\n<\/tr>\n
Body Material<\/td>\n316 Stainless Steel<\/td>\n<\/tr>\n
Outer Diameter (D)<\/td>\n25 mm<\/td>\n<\/tr>\n
Overall Length (L)<\/td>\n38 mm<\/td>\n<\/tr>\n
Hub Length (L1)<\/td>\n9 mm<\/td>\n<\/tr>\n
Available Bore Sizes<\/td>\n8, 10, 11, 12 mm<\/td>\n<\/tr>\n
Setscrew Thread<\/td>\nM4<\/td>\n<\/tr>\n
Wrench Torque<\/td>\n1.7 N\u00b7m<\/td>\n<\/tr>\n
Rated Torque<\/td>\n1 N\u00b7m<\/td>\n<\/tr>\n
Maximum Torque<\/td>\n2 N\u00b7m<\/td>\n<\/tr>\n
Maximum Rotational Speed<\/td>\n14,000 rpm<\/td>\n<\/tr>\n
Moment of Inertia<\/td>\n7.1 \u00d7 10\u207b\u2076 kg\u00b7m\u00b2<\/td>\n<\/tr>\n
Mass<\/td>\n100 g<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Dimension Drawing<\/h2>\n

\"STS7-25<\/p>\n

316 Stainless Steel \u2014 Material Advantages in the STS7-25 Context<\/h2>\n

At the 25 mm OD, 8\u201312 mm bore, and 1 N\u00b7m torque class, the STS7-25 serves a broad cross-section of industrial automation applications. The choice between aluminum TS7-25 and stainless STS7-25 is a material environment decision. Food processing lines with daily washdown using caustic soda or sodium hypochlorite solutions will corrode aluminum alloy over time \u2014 often within weeks in aggressive CIP environments. Pharmaceutical production in ISO-classified rooms may mandate stainless for material audit purposes even without active chemical exposure. Marine and coastal installations benefit from the molybdenum-enhanced chloride resistance of 316SS regardless of direct splash exposure. In all these cases, the STS7-25 delivers the same zero-backlash, high-speed, rigid transmission performance as its aluminum counterpart while lasting significantly longer in the operating environment.<\/p>\n

Typical Applications<\/h2>\n
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  • Food packaging encoder connections<\/strong> \u2014 stainless servo drives on shrink-wrap, tray-seal, and vacuum pack machines<\/li>\n
  • Pharmaceutical tablet coating pan tilt encoder<\/strong> \u2014 solvent atmosphere environment<\/li>\n
  • Chemical reactor instrumentation drives<\/strong> \u2014 corrosive vapour zone position feedback<\/li>\n
  • Offshore instrument positioning<\/strong> \u2014 corrosion-critical environments on vessels and platforms<\/li>\n
  • Brewery and dairy process drives<\/strong> \u2014 CIP-cleaned production zones<\/li>\n<\/ul>\n

    Customer Reviews and Case Studies<\/h2>\n
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    \u2605\u2605\u2605\u2605\u2605<\/p>\n

    Belgium \u2014 Food Packaging OEM<\/p>\n

    We specify the STS7-25 across our vacuum packaging machines for fresh produce. The encoder connections are in a zone washed with chlorinated water after every shift. Aluminum couplings corroded within 3 months. The stainless versions have been maintenance-free for 26 months.<\/p>\n

    \u2014 Senior Engineer, Ghent<\/p>\n<\/div>\n

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    \u2605\u2605\u2605\u2605\u2605<\/p>\n

    United States \u2014 Pharmaceutical Equipment<\/p>\n

    Used on tablet coating pan tilt drives in an acetone and ethanol solvent atmosphere. 316SS was the only acceptable material for this zone. The STS7-25 met our material specification and dimensional accuracy was confirmed on incoming inspection.<\/p>\n

    \u2014 Validation Engineer, New Jersey<\/p>\n<\/div>\n

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    \u2605\u2605\u2605\u2605\u2606<\/p>\n

    Saudi Arabia \u2014 Petrochemical Plant Maintenance<\/p>\n

    Replacement couplings for process valve position feedback in an H2S environment. The 316SS body has shown no corrosion in 14 months. The 10\/12 mm bore matched our existing shafts without any modification.<\/p>\n

    \u2014 Maintenance Engineer, Jubail<\/p>\n<\/div>\n<\/div>\n

    Frequently Asked Questions<\/h2>\n