Description
STS7C-32 Stainless Steel Clamp Type Rigid Coupling – 32mm OD 316SS Corrosion-Resistant Split-Body Connector
The STS7C-32 clamp type rigid coupling is the 316 stainless steel version of the TS7C-32 aluminum alloy model. It retains the split-body clamp mechanism, bore range of 10, 14, rated torque of 2 N·m, and maximum speed of 3,600 rpm of the aluminum variant — the only change is the body material, which is machined from 316 austenitic stainless steel rather than aluminum alloy. The STS7C-32 weighs 158 g (compared to 50 g for the TS7C-32) and delivers the same non-marring, zero-backlash, repositionable shaft connection in environments where aluminum would corrode.
At 158 g (versus 50 g for the TS7C-32 aluminum version), the STS7C-32 delivers the highest torque in the STS7C stainless clamp series — 2 N·m rated at up to 3,600 rpm — in a 32 mm OD 316SS body with M4 clamp screws and a 12 mm hub. This is the correct specification when medium-frame servo gearhead output shafts or precision ground drive shafts at the 10–14 mm bore class are connected in corrosion-demanding environments.
The stainless clamp mechanism is particularly valuable in food processing and pharmaceutical applications where the non-marring connection advantage of the clamp design and the corrosion resistance of 316SS are both required simultaneously — a combination that neither the aluminum clamp nor the stainless setscrew model addresses alone. Material certificates confirming 316SS grade are available on request. Full series listings are on our product catalog page.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | STS7C-32 |
| Body Material | 316 Stainless Steel |
| Outer Diameter (D) | 32 mm |
| Overall Length (L) | 41 mm |
| Hub Length (L1) | 12 mm |
| Available Bore Sizes | 10, 14 |
| Clamp Screw Thread | M4 |
| Rated Torque | 2 N·m |
| Maximum Torque | 4 N·m |
| Maximum Rotational Speed | 3,600 rpm |
| Moment of Inertia | 2.5 × 10⁻⁶ kg·m² |
| Mass | 158 g |
Dimension Drawing
Stainless Steel Clamp Coupling — Dual Advantage
The STS7C-32 addresses two requirements simultaneously that no single alternative coupling design can match: (1) a non-marring, distributed-clamp shaft connection that protects precision shaft surfaces and allows repositioning during commissioning, and (2) a 316 stainless steel body that resists corrosion in food washdown, pharmaceutical, and wet industrial environments. Applications in these sectors often require both attributes — a stainless setscrew would still mark the shaft surface, while an aluminum clamp coupling would corrode in the operating environment. The STS7C-32 solves both constraints in a single component.
The 316 stainless steel alloy used in the STS7C-32 contains molybdenum (2–3%), which provides improved chloride pitting resistance compared to the more common 304 grade. This is specifically valuable in environments with sodium hypochlorite (bleach), chlorinated CIP solutions, sea water, and chloride-containing industrial chemical atmospheres where 304 stainless would develop pitting over time.
Typical Applications
- Medium servo gearhead output coupling on stainless washdown conveyor servo drives in meat processing plants
- Chemical reactor instrument shaft connections — hardened and precision ground drive shafts in corrosive vapour zones
- Offshore deck winch servo encoder connections — salt spray and humidity, non-marring required by encoder warranty
- Pharmaceutical freeze-dryer (lyophiliser) door drive encoder — CIP environment, stainless material specification
- Desalination plant process control servo drives — brine-spray environment with precision shaft surface requirement
Customer Reviews and Case Studies
★★★★★
United Kingdom — Meat Processing Equipment OEM
We build stainless steel conveyor systems for beef processing facilities with daily chlorine washdown. The STS7C-32 is our standard for servo encoder connections on the largest drive axes. Both requirements — 316SS for the environment and non-marring clamp for our encoder supplier’s warranty — are met in one part. In service for over two years without issue.
— Design Engineer, Leeds
★★★★★
Norway — Offshore Engineering
Installed on deck winch servo encoder connections on an FPSO vessel. 316SS material was mandatory per our offshore specification; non-marring clamp was required because the encoder manufacturer voids the warranty if setscrew contact is made on their shaft. STS7C-32 was the only coupling meeting both requirements in the 14 mm bore class.
— Systems Engineer, Stavanger
★★★★☆
Germany — Chemical Plant Instrumentation
Used on servo-driven valve actuator shaft connections in an HCl process area. The hardened valve stem cannot accept setscrew contact; 316SS is required for the corrosive atmosphere. The STS7C-32 addressed both constraints. The 10/14 mm bore combination covered our actuator and encoder shaft sizes without modification.
— Instrumentation Engineer, Frankfurt
Frequently Asked Questions
What makes the STS7C-32 the unique solution for its application class?
The STS7C-32 is the only coupling in this bore and torque class that simultaneously provides 316SS corrosion resistance AND a non-marring clamp connection. No other single coupling addresses both: stainless setscrews mark shafts; aluminum clamps corrode. The STS7C-32 is specified when both attributes are required together.
What bore sizes are available for the STS7C-32?
10 and 14 mm bore diameters on each side independently. Both equal-bore and mixed-bore configurations are available.
Why does the STS7C-32 use M4 clamp screws?
M4 screws provide approximately 1.78× the clamping force of M3 screws at the same tightening torque, which is necessary to achieve reliable torque transmission at the rated 2 N·m level in this frame size.
Is the STS7C-32 dimensionally compatible with the TS7C-32?
Yes. All external and internal dimensions are identical between the STS7C-32 and TS7C-32. The only difference is body material: 316 stainless steel (158 g) versus aluminum alloy (50 g).
What documentation is available with the STS7C-32?
Material mill certificates (316SS composition and heat number), dimensional inspection reports, and commercial shipping documentation are all available on request. Indicate documentation requirements when placing your order or enquiry.
Get a Quote for the STS7C-32 Stainless Clamp Rigid Coupling
Ever Power manufactures the STS7C-32 and the complete STS7C stainless clamp coupling series in-house, with 316SS material certification on request. Provide bore sizes, quantity, and application details for a factory-direct quote.
