SIT-LOCK 30 MONOLOCK Keyless Locking Bushes
SIT-LOCK 30 MONOLOCK are one-piece clamping elements designed for quick and easy installation in applications with low to medium torque requirements.
They provide a secure, zero-backlash shaft-to-hub connection as an alternative to traditional connections using keys, keyways and splines.
The frictional connection is achieved by tightening a special screw with a tapered seating surface inside the conical bore of the single cylindrical ring. Once tightened, the component is capable of transmitting torque and is simultaneously secured against axial displacement.
Products are sorted by name in ascending order.
SIT-LOCK 30 MONOLOCK - 18 × 38 mm (CAL30F18/38)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
5.78€ excl. VAT
6.99€ incl. VAT
SIT-LOCK 30 MONOLOCK - 19 × 39 mm (CAL30F19/39)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
5.78€ excl. VAT
6.99€ incl. VAT
SIT-LOCK 30 MONOLOCK - 20 × 40 mm (CAL30F20/40)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
5.78€ excl. VAT
6.99€ incl. VAT
SIT-LOCK 30 MONOLOCK - 22 × 42 mm (CAL30F22/42)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
5.78€ excl. VAT
6.99€ incl. VAT
SIT-LOCK 30 MONOLOCK - 24 × 44 mm (CAL30F24/44)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
5.78€ excl. VAT
6.99€ incl. VAT
SIT-LOCK 30 MONOLOCK - 25 × 45 mm (CAL30F25/45)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
5.78€ excl. VAT
6.99€ incl. VAT
SIT-LOCK 30 MONOLOCK - 28 × 48 mm (CAL30F28/48)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
6.62€ excl. VAT
8.01€ incl. VAT
SIT-LOCK 30 MONOLOCK - 30 × 50 mm (CAL30F30/50)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
6.62€ excl. VAT
8.01€ incl. VAT
SIT-LOCK 30 MONOLOCK - 32 × 52 mm (CAL30F32/52)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
7.64€ excl. VAT
9.24€ incl. VAT
SIT-LOCK 30 MONOLOCK - 35 × 55 mm (CAL30F35/55)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
7.64€ excl. VAT
9.24€ incl. VAT
SIT-LOCK 30 MONOLOCK - 38 × 58 mm (CAL30F38/58)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
7.95€ excl. VAT
9.62€ incl. VAT
SIT-LOCK 30 MONOLOCK - 40 × 60 mm (CAL30F40/60)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
7.95€ excl. VAT
9.62€ incl. VAT
SIT-LOCK 30 MONOLOCK - 42 × 67 mm (CAL30F42/67)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.19€ excl. VAT
13.54€ incl. VAT
SIT-LOCK 30 MONOLOCK - 45 × 70 mm (CAL30F45/70)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
11.33€ excl. VAT
13.70€ incl. VAT
SIT-LOCK 30 MONOLOCK - 48 × 73 mm (CAL30F48/73)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
12.19€ excl. VAT
14.75€ incl. VAT
SIT-LOCK 30 MONOLOCK - 50 × 75 mm (CAL30F50/75)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
12.19€ excl. VAT
14.75€ incl. VAT
SIT-LOCK 30 MONOLOCK - 55 × 80 mm (CAL30F55/80)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
13.34€ excl. VAT
16.14€ incl. VAT
SIT-LOCK 30 MONOLOCK - 60 × 85 mm (CAL30F60/85)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
13.62€ excl. VAT
16.49€ incl. VAT
SIT-LOCK 30 MONOLOCK - 65 × 90 mm (CAL30F65/90)
Locking Bush
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
15.46€ excl. VAT
18.70€ incl. VAT
Products are sorted by name in ascending order.
Bush Construction
- Cylindrical bush body
- Locking mechanism
- Keyless cylindrical bore
Typical Applications
SIT-LOCK 30 MONOLOCK elements are intended for general industrial use, particularly in applications that require quick installation, easy removal, and a compact design.
They are commonly used to mount V-belt, timing and flat pulleys, sprockets, flywheels, drums, and other components where a backlash-free shaft-to-hub connection is required without the use of keys or keyways.
Materials
Steel.
Key Features
- Quick and easy installation – requires only tightening a single screw to the specified torque
- Uniform load distribution over the entire contact surface
- Zero backlash = perfectly rigid and precise shaft-to-hub connection
- One-piece design enables compact dimensions and cost-effective use
- No shaft weakening caused by keyway slots
- Highly accurate axial and angular positioning on the shaft
Bush Code Description
Example:
SIT-LOCK 30 MONOLOCK - 25 × 45 mm (CAL30F25/45)
| Code Part | Description |
|---|---|
| SIT-LOCK 30 MONOLOCK |
Clamping element type |
| 25 |
Inner diameter of the clamping element – shaft bore in mm |
| 45 |
Outer diameter of the clamping element in mm |
| CAL30F25/45 |
Alternative product designation |
Documents for Download
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Bush Manufacturer Profile
SIT S.p.A. is a company focused on mechanical power transmission (SIT stands for Società Italiana Trasmissioni, meaning Italian Power Transmission Company). Under the SIT brand, it develops, engineers, manufactures, and distributes high-quality solutions and components for industrial applications across a wide range of sectors – from automotive and precision engineering to the food and textile industries, as well as chemical plants and logistics centers.
Together with Elatech S.r.l. and other companies, SIT S.p.A. is part of the Scaglia Group. The Group operates in Europe, North America, and Asia, and comprises 7 manufacturing facilities and 6 subsidiaries with more than 1,000 employees. As part of the Group, the individual companies benefit from shared technologies and innovations, providing financial stability and sustainable growth.
We are an authorized distributor of shaft couplings, bushes, sprockets, and pulleys from SIT S.p.A., as well as polyurethane timing belts and conveyor belts from Elatech S.r.l.