Tighten and loosen nuts and bolts with the open end or the polygonal ring end.

Star knob with threaded stud Unifix
Also known as: star grip knob, clamping knob
Key features
- L thread20, 30, 40
- Internal diameter17, 21, 25
- Diameter30, 40, 50
- Height24, 27, 35
What it is
The Unifix clamping handwheel with threaded stud (code 0237-930-520-01) is the practical solution for manually adjusting bolts and fastening systems where precision and speed are essential. Designed for professionals in industry, construction and mechanical maintenance, this accessory simplifies tightening operations without using power tools, reducing time and the risk of errors.
A wing knob (or star knob) is a hand knob with a threaded stud or hole, tightened by hand onto a thread.
What it is for
Used for assembling steel structures, in steel fabrication, from cutting to assembly and for mechanical fixing of structures and components to walls, ceilings and floors.
How to use it
Choose the thread of the same size as the stud or hole it is to be fitted to. Screw it on by hand until it sits against the part, then tighten using finger strength only, so it can be removed without tools. Use it where the fixing needs frequent adjustment or removal, not where a firm tightening torque is required.
Where it is used
- Mechanical engineering industry
- Mechanical workshops
Technical data
- L thread: 20, 30, 40
- Internal diameter: 17, 21, 25
- Diameter: 30, 40, 50
- Height: 24, 27, 35
Who it is for
Designed for metal fabricators, industrial maintenance technicians and mechanics.
Related products
- Clamping handwheel with threaded stud Unifix
- Star knob with threaded insert Unifix
- Hex nut stainless steel A2 AISI 304 Cl.70 Unifix — from the category Hex Nuts
- Serrated washer Unifix — from the category Flat Washers
- Combination wrench (STMT95792-0) Stanley — from the category Combination Spanners
- Browse the whole category: Bolts and Metric Screws
Before you order
In your request, please state the diameter, the thread and the quantities required, so we can give you the right quotation first time.
For prices and availability, request a quote from AMES Srl: we will reply with our quotation, delivery times and, where needed, an equivalent technical alternative.
Specifications 4
| L thread | 20, 30, 40 |
|---|---|
| Internal diameter | 17, 21, 25 |
| Diameter | 30, 40, 50 |
| Height | 24, 27, 35 |
The perfect setup for this job
Everything you need in one place, from functionality to safety.
For the job
Drive and remove screws with a hex or Torx recess, even in tight spaces.
Tighten and loosen hex nuts and screws of different sizes with a single ratchet.



