Frequently Asked Questions – KUKEN KG-25 Pneumatic Straight Grinder:

General Specifications

1/ What type of tool is the KG-25?

The KG-25 is a pneumatic straight grinder designed for deburring, chamfering, and surface finishing of metal parts.

2/ What is the chuck (collet) size?

The grinder uses a 6 mm (1/4") collet to secure grinding stones or burr bits.

3/ What is the no-load speed of the KG-25?

The no-load rotational speed is 3 400 rpm, providing efficient material removal.

4/ What is the overall length and weight?

The tool measures 203 mm in length and weighs approximately 0.75 kg, enabling comfortable one-handed operation.

Operating Conditions

5/ What air pressure is required?

A nominal supply pressure of 0.6 MPa (6 bar or 90 psi) is recommended for optimal performance.

6/ How much compressed air does it consume?

Air consumption is around 0.45 m³/min, so ensure your compressor can sustain that flow for continuous use.

7/ What hose connection does it use?

The inlet thread is Rc 1/4", and a hose with at least a 6 mm inner diameter is advised to minimize pressure drop.

8/ Where is the exhaust port located?

Exhaust is directed rearward, pulling air away from the workpiece and operator.

9/ Can I adjust the grinder’s speed?

The KG-25 does not feature an onboard speed control. Speed will vary slightly based on supply pressure and load.

Accessories & Consumables

10/ Which grinding stones fit the KG-25?

Use 88 mm × 6 mm stones or burr attachments compatible with a 6 mm shank.

11/ What comes in the standard accessory kit?

One 88 mm × 15 t eraser wheel

One 14 mm open-end wrench

One Rc 1/4" coupling plug

One inline air regulator

12/ Can I use other brands of burrs or stones?

Yes. Just ensure the shank or hole diameter matches the 6 mm collet specification.

Maintenance & Service

13/ How often should I lubricate the grinder?

Add a few drops of pneumatic tool oil into the air inlet before every work shift, or after 8–12 hours of cumulative use.

14/ How do I clean the air filter and regulator?

Disassemble your inline air preparation unit, rinse the filter elements with clean solvent, let dry, and reassemble.

15/ What parts require regular replacement?

Collet and nut (inspect for wear every 50 hours)

Air filter element (replace every 200 hours)

O-rings and seals (replace when leakage or air loss is detected)

16/ Where can I obtain spare parts?

Genuine spare parts are available from KUKEN distributors as QTE Technologies. Provide part numbers or a service manual reference when ordering.

Safety & Best Practices

17/ What personal protective equipment (PPE) is recommended?

Safety glasses or face shield

Dust mask or respirator for fine particles

Cut-resistant gloves

Hearing protection if noise levels exceed 85 dB

18/ How should I mount grinding stones safely?

Shut off and bleed air supply.

Use the provided wrench to loosen the collet nut.

Center the grinding stone shank in the collet.

Tighten the nut firmly—but do not over-torque.

19/ What precautions should I take to avoid kickback?

Always maintain firm, two-handed control.

Do not apply excessive lateral force to the stone.

Keep the workpiece firmly clamped or secured.

Ordering, Warranty & Support

20/ What is the warranty period?

The KG-25 carries a 6-month limited warranty against manufacturing defects when used per guidelines.

21/ How do I request a quote or place an order?

Contact your local KUKEN distributor as QTE Technologies (qtetech.com/en)

22/ Which countries ship the KG-25?

KUKEN products are available worldwide through distributors as QTE Technologies. Check availability and shipping options with your regional supplier.

23/ Who should I contact for technical support?

Reach out to KUKEN customer service at the telephone or email provided in the product manual for troubleshooting and service requests / or contact QTE Technologies (qtetech.com/en).