Lathe chuck jaws for CNC lathe clamping, profile matching and repeat workholding.
Lathe Soft Jaws & Hard Jaws
KORRETTO lathe soft jaws and hard jaws are CNC chuck jaws used with compatible hydraulic chucks, manual chucks and other lathe chuck systems to match different workpiece shapes and cutting conditions. Soft jaws can be machined to the workpiece profile for repeat CNC turning and improved contact. Hard jaws are used for general gripping, durability and heavier clamping conditions. This page keeps soft jaws and hard jaws in one combined page, with separate images, drawings and parameter tables.
Product Overview
Soft jaws and hard jaws are supporting components for lathe chuck systems, including hydraulic chucks, manual chucks and other compatible CNC lathe workholding setups. They should be selected by chuck model, jaw interface, serration, mounting hole pattern, workpiece shape, gripping diameter, clamping surface and machining load.
This page is a combined page for soft jaws and hard jaws. The two groups must remain separated in the layout so users can clearly identify the product image, drawing and parameter table for each jaw type.
Product Types
| Type | Description | Typical use |
|---|---|---|
| Lathe Soft Jaws | Machinable soft jaws used to match the workpiece profile. | Repeat CNC turning, profile-matched clamping, improved contact area and reduced marking risk. |
| Lathe Hard Jaws | Hardened jaws for general or heavier gripping. | General clamping, heavier cutting, rougher work and durable hard jaw use on compatible lathe chucks. |
Soft Jaw and Hard Jaw Technical Data
Lathe Soft Jaws
Use this drawing to check soft jaw dimensions, serration, mounting hole pattern and compatible chuck interfaces.
| Model | S-1 | S-2 | S-3 | S-4 | S-5 | S-6 | S-7 | S-8 | S-9 | S-10 | H-11 | S-12 | S-13 | Compatible Chuck | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SJ-04 | 52 | 23 | 23 | 10 | 4 | 10 | 14 | 28 | 9 | 14 | 13 | M8 | 3 | 3K-04 3S-04 | 0.5 |
| SJ-05 | 62 | 25 | 30 | 5 | 38 | 16 | 3.5 | 3K-05 3S-05 | 0.7 | ||||||
| SJ-06 | 73 | 31 | 36 | 12 | 15 | 20 | 11 | 17 | 20 | M10 | 14 | 3K-06 3S-06 | 1.5 | ||
| SJ-08 | 95 | 35 | 37 | 14 | 24 | 25 | 46 | 13 | 19 | 22 | M12 | 16 | 3K-08 3S-08 | 2.5 | |
| SJ-10 | 110 | 40 | 42 | 16 | 30 | 30 | 50 | 27 | 18 | 3K-10 3S-10 | 3.7 | ||||
| SJ-12 | 130 | 50 | 50 | 21 | 49 | 61 | 18 | 26 | 30 | M16 | 3K-12 | 6.2 | |||
| SJ-12-1 | 18 | 16 | 23 | M14 | 3S-12 | 6.3 | |||||||||
| SJ-15 | 165 | 62 | 62 | 25.5 | 37 | 43 | 85 | 21 | 32 | 38 | M20 | 3K-15 | 12.6 | ||
| SJ-15-1 | 22 | 8 | 3S-15 | 12.7 |
Lathe Hard Jaws
Use this drawing to check hard jaw dimensions, serration, mounting hole pattern and compatible chuck interfaces.
| Model | H-1 | H-2 | H-3 | H-4 | H-5 | H-6 | H-7 | H-8 | H-9 | H-10 | H-11 | Compatible Chuck | Weight (kg) | Reference Figure |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| HJ-05 | 53 | 23 | 28 | 10 | 4 | 30.5 | 14 | 22.5 | 10 | M8 | 6 | 3K-04 3K-05 3S-05 | 0.4 | Fig2 |
| HJ-06 | 67 | 31 | 35 | 12 | 40 | 20 | 26.6 | 12 | M10 | 10 | 3K-06 3S-06 | 1.0 | ||
| HJ-08 | 88 | 35 | 51 | 14 | 5 | 31 | 25 | 18 | M12 | 12 | 3K-08 3S-08 | 1.95 | Fig1 | |
| HJ-10 | 101 | 40 | 54 | 16 | 43 | 30 | 17 | 13 | 13 | 3K-10 3S-10 | 1.95 | |||
| HJ-12 | 103 | 50 | 52 | 21 | 62.5 | 40.5 | 17 | M16 | 30 | 3K-12 | 2.65 | Fig2 | ||
| HJ-12-1 | 18 | M14 | 3S-12 | 2.7 | ||||||||||
| HJ-15 | 149 | 62 | 86 | 25.5 | 8 | 63 | 43 | 34 | 20 | M20 | 43 | 3K-15 | 9.4 | Fig1 |
| HJ-15-1 | 22 | 3S-15 | 9.5 |
Soft Jaw and Hard Jaw Selection Notes
- Confirm the chuck model, jaw interface and serration before selecting soft jaws or hard jaws.
- Use soft jaws when the jaw profile needs to be machined to match the workpiece for repeat CNC turning.
- Use hard jaws for general gripping or heavier workholding conditions.
- Check jaw height, serration, mounting hole pattern, gripping diameter and clamping range.
- Do not select chuck jaws only by chuck diameter; jaw interface and chuck model must match.
Related Hydraulic Chuck and Workholding Pages
FAQ
What are lathe soft jaws used for?
Lathe soft jaws are machined to match the workpiece profile, helping improve contact area and repeat clamping consistency in CNC turning or other compatible lathe chuck workholding.
What are hard jaws used for?
Hard jaws are used for general gripping, rougher work and applications where jaw durability and repeat use are more important than machining the jaw profile.
Can soft jaws and hard jaws be used on the same chuck?
They can be used on compatible chuck systems, but the jaw interface, serration, mounting hole pattern and chuck model must match.
Do soft jaws reduce workpiece marking?
They can help reduce marking when machined correctly to match the workpiece, but the result depends on material, contact area, clamping force and cutting load.
What information should I provide for jaw selection?
Provide the chuck model, chuck size, jaw interface, serration, mounting hole pattern, workpiece drawing, gripping diameter, material, required clamping surface and machining load.