20B Sprockets with Finished Bore, Hub, and Hardened Teeth for DIN 8187 Roller Chains (B-Series)
20B sprockets with finished bore, hub, and hardened teeth are ready for immediate installation on the appropriate shaft without the need for additional machining. They are designed for drives with all types of 20B-1 (1 1/4″ × 3/4″) simplex roller chains of the so-called European series (B-series), standardized to ISO 606 (DIN 8187). They are available in simplex design.
The bore with a keyway ensures precise mounting and effective power transmission. It is manufactured with a tolerance class of H7. Additionally, the hub is equipped with two threaded holes and set screws for precise shaft fixation.
Products are sorted by name in ascending order.
20B-1-11-NKZ/D35 (1 1/4″ × 3/4″) - 11 Teeth, with Hub, Hardened Teeth, 2 M8 Screws, Bore 35H7, Keyway (Steel)
Sprocket with hardened teeth
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
32.19€ excl. VAT
38.95€ incl. VAT
20B-1-11-NKZ/D40 (1 1/4″ × 3/4″) - 11 Teeth, with Hub, Hardened Teeth, 2 M10 Screws, Bore 40H7, Keyway (Steel)
Sprocket with hardened teeth
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
32.19€ excl. VAT
38.95€ incl. VAT
20B-1-12-NKZ/D35 (1 1/4″ × 3/4″) - 12 Teeth, with Hub, Hardened Teeth, 2 M8 Screws, Bore 35H7, Keyway (Steel)
Sprocket with hardened teeth
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
39.60€ excl. VAT
47.91€ incl. VAT
20B-1-12-NKZ/D50 (1 1/4″ × 3/4″) - 12 Teeth, with Hub, Hardened Teeth, 2 M12 Screws, Bore 50H7, Keyway (Steel)
Sprocket with hardened teeth
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
39.60€ excl. VAT
47.91€ incl. VAT
20B-1-13-NKZ/D40 (1 1/4″ × 3/4″) - 13 Teeth, with Hub, Hardened Teeth, 2 M10 Screws, Bore 40H7, Keyway (Steel)
Sprocket with hardened teeth
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
43.95€ excl. VAT
53.18€ incl. VAT
20B-1-13-NKZ/D50 (1 1/4″ × 3/4″) - 13 Teeth, with Hub, Hardened Teeth, 2 M12 Screws, Bore 50H7, Keyway (Steel)
Sprocket with hardened teeth
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
43.95€ excl. VAT
53.18€ incl. VAT
20B-1-13-NKZ/D60 (1 1/4″ × 3/4″) - 13 Teeth, with Hub, Hardened Teeth, 2 M12 Screws, Bore 60H7, Keyway (Steel)
Sprocket with hardened teeth
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
43.95€ excl. VAT
53.18€ incl. VAT
20B-1-14-NKZ/D50 (1 1/4″ × 3/4″) - 14 Teeth, with Hub, Hardened Teeth, 2 M12 Screws, Bore 50H7, Keyway (Steel)
Sprocket with hardened teeth
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
53.15€ excl. VAT
64.31€ incl. VAT
20B-1-14-NKZ/D60 (1 1/4″ × 3/4″) - 14 Teeth, with Hub, Hardened Teeth, 2 M12 Screws, Bore 60H7, Keyway (Steel)
Sprocket with hardened teeth
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
53.15€ excl. VAT
64.31€ incl. VAT
20B-1-15-NKZ/D40 (1 1/4″ × 3/4″) - 15 Teeth, with Hub, Hardened Teeth, 2 M10 Screws, Bore 40H7, Keyway (Steel)
Sprocket with hardened teeth
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
60.44€ excl. VAT
73.13€ incl. VAT
20B-1-15-NKZ/D50 (1 1/4″ × 3/4″) - 15 Teeth, with Hub, Hardened Teeth, 2 M12 Screws, Bore 50H7, Keyway (Steel)
Sprocket with hardened teeth
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
60.44€ excl. VAT
73.13€ incl. VAT
20B-1-17-NKZ/D50 (1 1/4″ × 3/4″) - 17 Teeth, with Hub, Hardened Teeth, 2 M12 Screws, Bore 50H7, Keyway (Steel)
Sprocket with hardened teeth
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
74.90€ excl. VAT
90.63€ incl. VAT
20B-1-19-NKZ/D50 (1 1/4″ × 3/4″) - 19 Teeth, with Hub, Hardened Teeth, 2 M12 Screws, Bore 50H7, Keyway (Steel)
Sprocket with hardened teeth
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
84.86€ excl. VAT
102.68€ incl. VAT
20B-1-19-NKZ/D60 (1 1/4″ × 3/4″) - 19 Teeth, with Hub, Hardened Teeth, 2 M12 Screws, Bore 60H7, Keyway (Steel)
Sprocket with hardened teeth
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
84.86€ excl. VAT
102.68€ incl. VAT
20B-1-20-NKZ/D70 (1 1/4″ × 3/4″) - 20 Teeth, with Hub, Hardened Teeth, 2 M12 Screws, Bore 70H7, Keyway (Steel)
Sprocket with hardened teeth
At Supplier
Within 2 Weeks Usual time this product is ready for shipping. Actual availability may vary due to unforeseen circumstances in exceptional cases.
90.10€ excl. VAT
109.02€ incl. VAT
Products are sorted by name in ascending order.
Typical Applications
20B sprockets with a finished bore, hub, and hardened teeth for DIN 8187 roller chains are designed for a wide range of industrial applications – from light to heavy industry.
They are most commonly used in power transmission systems, but they also find applications in lifting and material transport systems. Typical fields of use include conveyors, food processing machines, and glassmaking equipment, as well as many other industrial applications.
Materials
C45E steel (according to UNI EN 10083-1).
Sprocket Code Description
Example:
20B-1-12-NKZ/D50 (1 1/4″ × 3/4″) - 12 Teeth, with Hub, Hardened Teeth, 2 M12 Screws, Bore 42H7, Keyway (Steel)
| Code Part | Description |
|---|---|
| 20B |
Chain type |
| 1 |
Simplex design |
| 12 |
Number of teeth |
| NKZ/D |
Design with hub, hardened teeth, 2 threads with screws, and finished bore |
| 50 |
Finished bore diameter (in mm) |
| 1 1/4″ × 3/4″ |
Pitch (in inches) × inner width (in inches) |
| 12 Teeth, with Hub, Hardened Teeth, 2 M12 Screws, Bore 42H7, Keyway (Steel) |
Sprocket design, number and thread size of screws, finished bore diameter (in mm) with tolerance class, and sprocket material |
Documents for Download
Dimensions and Parameters of Hardened Teeth Sprockets with Finished Bore
TYMA CZ Data Sheets
Czech and English (PDF 1.39 MB)
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