{"id":3472,"date":"2026-07-08T05:14:21","date_gmt":"2026-07-08T05:14:21","guid":{"rendered":"https:\/\/rigid-shaft-coupling.top\/product\/sts7-20-stainless-steel-setscrew-rigid-coupling-20mm-od-316ss-corrosion-resistant-precision-coupler\/"},"modified":"2026-07-08T05:14:22","modified_gmt":"2026-07-08T05:14:22","slug":"sts7-20-stainless-steel-setscrew-rigid-coupling-20mm-od-316ss-corrosion-resistant-precision-coupler","status":"publish","type":"product","link":"https:\/\/rigid-shaft-coupling.top\/ko\/product\/sts7-20-stainless-steel-setscrew-rigid-coupling-20mm-od-316ss-corrosion-resistant-precision-coupler\/","title":{"rendered":"STS7-20 Stainless Steel Setscrew Rigid Coupling \u2013 20mm OD 316SS Corrosion-Resistant Precision Coupler"},"content":{"rendered":"
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STS7-20 Stainless Steel Setscrew Rigid Coupling \u2013 20 mm OD 316SS Corrosion-Resistant Precision Connector<\/h1>\n

The STS7-20 setscrew type rigid coupling<\/strong> is the 316 stainless steel version of the TS7-20 aluminum alloy model. Maintaining the same 20 mm outer diameter, 30 mm overall length, bore range of 5 to 10 mm, and 0.5 N\u00b7m nominal torque rating, the STS7-20 delivers identical mechanical performance in a material that resists corrosion in wet, chemical, and hygienically demanding environments. The decision to specify STS7-20 over TS7-20 is driven entirely by the installation environment: wherever chlorinated cleaning agents, organic solvents, salt spray, or humidity-laden atmospheres would attack and degrade an aluminum body, the 316 stainless steel STS7-20 is the correct choice.<\/p>\n

The mass increases from 20 g (TS7-20) to 54 g (STS7-20) as a consequence of 316 stainless steel’s higher density. The moment of inertia rises to 2.2 \u00d7 10\u207b\u2076 kg\u00b7m\u00b2 \u2014 approximately 2.6 times that of the TS7-20 at 8.5 \u00d7 10\u207b\u2077 kg\u00b7m\u00b2. For servo axis inertia ratio calculations in high-acceleration systems, this figure should be included in the reflected inertia analysis. For the majority of standard servo applications, the added coupling inertia remains within acceptable servo stability margins.<\/p>\n

A full comparison between TS7 aluminum and STS7 stainless coupling specifications is available on our product catalog page<\/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>\nSTS7-20<\/td>\n<\/tr>\n
Body Material<\/td>\n316 Stainless Steel<\/td>\n<\/tr>\n
Outer Diameter (D)<\/td>\n20 mm<\/td>\n<\/tr>\n
Overall Length (L)<\/td>\n30 mm<\/td>\n<\/tr>\n
Hub Length (L1)<\/td>\n7 mm<\/td>\n<\/tr>\n
Available Bore Sizes<\/td>\n5, 6, 8, 10 mm<\/td>\n<\/tr>\n
Setscrew Thread<\/td>\nM3<\/td>\n<\/tr>\n
Wrench Torque<\/td>\n0.7 N\u00b7m<\/td>\n<\/tr>\n
Rated Torque<\/td>\n0.5 N\u00b7m<\/td>\n<\/tr>\n
Maximum Torque<\/td>\n1 N\u00b7m<\/td>\n<\/tr>\n
Maximum Rotational Speed<\/td>\n18,000 rpm<\/td>\n<\/tr>\n
Moment of Inertia<\/td>\n2.2 \u00d7 10\u207b\u2076 kg\u00b7m\u00b2<\/td>\n<\/tr>\n
Mass<\/td>\n54 g<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Dimension Drawing<\/h2>\n

\"STS7-20<\/p>\n

When to Choose 316 Stainless Steel<\/h2>\n

\"STS7-20<\/p>\n

The molybdenum content of 316 stainless steel is the critical differentiator from the more common 304 grade and from aluminum alloys. Molybdenum provides improved resistance to chloride pitting \u2014 the corrosion mechanism that most commonly attacks metallic surfaces in food washdown, coastal, and chemical environments. In practical terms, the STS7-20 will resist daily CIP cycles with sodium hypochlorite or caustic soda concentrations typical in food production, whereas an aluminum coupling in the same environment would show pitting and surface degradation within weeks. This material durability directly reduces unplanned maintenance interventions and coupling replacement frequency.<\/p>\n

Typical Applications<\/h2>\n
    \n
  • Beverage filling and capping machine encoder drives<\/strong> \u2014 wet zone operations with routine chemical washdown<\/li>\n
  • Laboratory autosampler and chromatography axes<\/strong> \u2014 organic solvent and reagent exposure<\/li>\n
  • Marine deck instrument positioning drives<\/strong> \u2014 salt spray and coastal humidity environments<\/li>\n
  • Pharmaceutical blister pack machine encoder connections<\/strong> \u2014 GMP-compliant material requirement<\/li>\n
  • Coastal HVAC and industrial control systems<\/strong> \u2014 motorised damper and valve position feedback<\/li>\n<\/ul>\n

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

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

    Denmark \u2014 Beverage Equipment OEM<\/p>\n

    We use the STS7-20 on filler head encoder connections in our beer filling lines. The washdown environment includes NaOH and chlorine CIP chemicals that destroyed our previous aluminum couplings within months. The stainless version has been running for 22 months without any corrosion or mechanical issue.<\/p>\n

    \u2014 Mechanical Engineer, Copenhagen<\/p>\n<\/div>\n

    \n

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

    Canada \u2014 Pharmaceutical Automation<\/p>\n

    Specified for a sterile fill-finish machine encoder axis in a GMP production environment. The 316SS body met our material qualification requirement. First article inspection confirmed all dimensions within tolerance. Repeat orders have been dimensionally consistent.<\/p>\n

    \u2014 Validation Specialist, Toronto<\/p>\n<\/div>\n

    \n

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

    Australia \u2014 Marine Instrumentation<\/p>\n

    Used in a meteorological positioning drive on a research vessel. Corrosion resistance in salt spray has met expectations entirely. The 8\/10 mm bore combination matched our motor and encoder shafts without modification.<\/p>\n

    \u2014 Electrical Engineer, Hobart<\/p>\n<\/div>\n<\/div>\n

    Frequently Asked Questions<\/h2>\n