Type K M4 star knob with brass bush — original photorealistic rendering
Type K star knobs and an unmarked box — original illustration
Original type K knob diagram with labels d d1 d2 h t

M4 type K star knob 20 mm - 1 pcs.

Neron
zł7.87 Grosszł6.40 Net

Type K star knob with blind M4 female thread. Knob diameter 20 mm, height 17 mm, thread pitch 0,7 mm. FS31 Bakelite body, brass insert. Price for one knob. Catalogue mass of the quantity 0,00453 kg. Fulfilment time: 2 days.

Thread and knob diameter d1:

M4x20 - selected M5x25 M5x32 M6x32 M6x40 M8x40 M8x50 M8x63 M10x50 M10x63 M12x50 M12x63 M12x80 M16x80

Number of pieces - M4 and d1 20 mm:

1 pcs. - selected 10 pcs.

Dispatch within:
2 days
Shipping cost incl. VAT:
from zł8.61
Availability:
Available
Weight:
0,00453 kg
Secure payments
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Type K star knob with M4 female thread

Catalogue number: 56921.040.020
Catalogue search code: 56921040020

Seven-lobed knob with a closed front face and a blind threaded hole accessible from the hub side. The body is made from phenol-formaldehyde, also known as FS31 Bakelite. In this M4 variant with a diameter of 20 mm, the threaded insert is brass.

The catalogue designation M4x20 describes the M4 thread and the knob’s outside diameter of 20 mm. The number 20 does not indicate the threaded screw length. The supplier gives an approximate reference to DIN 6336-K, which is not a declaration of full conformity to the standard. Number 56921 identifies the catalogue family.

Original visualisation of a type K M4 knob with a brass insert

Dimensions of the M4 variant with d1 20 mm

d = M4 - metric female thread of the insert.

P = 0,7 mm - thread pitch.

d1 = 20 mm - outside diameter of the knob.

d2 = 10 mm - hub diameter.

h = 17 mm - overall body height.

t = 8 mm - axial dimension marked on the catalogue diagram. It does not specify a guaranteed usable thread engagement depth here.

Original diagram with labels d d1 d2 h t

Quantity and mass

The price is for one knob. The catalogue mass of one knob is 4,53 g. The mass of 1 pieces is 0,00453 kg, without adding any unconfirmed carton mass. Fulfilment time: 2 days.

Original illustration of an unlabelled package and type K knobs

Questions and answers

Does the thread pass through the entire knob?

No. The type K design has a closed front and a threaded hole accessible from the hub side.

What material is the M4 insert made from?

For this exact M4 variant with d1 20 mm, the supplier specifies a brass insert. The steel insert used in other family sizes must not be assumed for this variant.

What does M4x20 mean in the variant numbering?

The M4 thread and the knob’s outside diameter of 20 mm. The thread pitch is 0,7 mm and the body height is 17 mm.

How many pieces does the price cover?

The price is for one knob. Select the offer corresponding to the required number of pieces. The carton visualisation does not show all items included in the quantity sold.

  • Brand
  • Reference
    6926702924
  • Waga
    0,00453 kg
  • In stock
    997 Items

  • Thread type
    Metric internal
  • Body material
    Phenol-formaldehyde (Bakelite) FS31
  • Thread pitch P
    0,7 mm
  • Height h
    17 mm
  • Dimensional reference
    Approximately DIN 6336-K
  • Thread size
    M4
  • Catalogue number
    56921.040.020
  • Catalogue code
    56921040020
  • Product type
    Star knob
  • Design type
    K - blind internal thread
  • Bush material
    Brass
  • Outside diameter d1
    20 mm
  • Hub diameter d2
    10 mm
  • Dimension t
    8 mm
  • Quantity sold
    1 pc
  • Catalogue mass per piece
    4,53 g
  • Mass of quantity sold
    0,00453 kg

Workplace safety warnings — in accordance with Regulation (EU) 2023/988 on general product safety:
1. Eye protection:
– Always wear safety goggles or a face shield to protect your eyes from sparks, particles and metal fragments.
2. Hearing protection:
– When working in a noisy environment, use ear defenders or earplugs to prevent hearing damage.
3. Respiratory protection:
– When working in dusty surroundings or in the presence of fumes, wear a filtering mask or an appropriate respirator.
– Ensure proper ventilation of the workstation.
4. Hand and skin safety:
– Use protective gloves that protect against mechanical injuries and chemicals.
– Where necessary, use protective creams to prevent irritation and dry skin.
5. Work clothing:
– Work in protective clothing resistant to sparks and splashes.
– Avoid loose clothing, jewellery and loose hair near machinery.
6. Fire risk:
– Keep the workstation free of flammable materials (e.g. paper, fabrics and chemicals).
– Keep a serviceable fire extinguisher close at hand and know how to use it.
7. Electrical hazards:
– Check the condition of cables and electrical equipment before use.
– Do not use electrical devices in damp conditions.
– Disconnect equipment from the power supply during maintenance or repairs.
8. Use of machinery and tools:
– Regularly inspect the technical condition of machines and tools.
– Use equipment in accordance with the manufacturer's instructions.
– Blades and tools should be maintained regularly and kept in good condition.
– Machines should be fitted with appropriate guards and protective devices.
9. Handling materials:
– Use handling equipment to move heavy components.
– Lift and carry using ergonomic practices to avoid injury.
10. Working with chemicals:
– Store chemicals in labelled, safe containers.
– Use substances in accordance with the manufacturer's instructions and occupational health and safety rules.
– Ensure air circulation when using chemicals.
Other important rules:
– Keep the workstation clean and tidy.
– Ensure adequate lighting in the working area.
– Provide occupational health and safety training.
– Carry out regular safety audits and comply with current regulations.

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