Bearing, 6004-2RS

Name: Bearing, 6004-2RS
Brand: Sieg Industrial Group
SKU: 5350
Price: 12.89 USD
Availability: InStock
Rating: 5.0 (5 reviews)

$12.89 ~~$18.95~~ In stock

Bearing, Spindle

6004-2RS deep groove ball bearing.

The bearing is 20 mm ID, 42mm OD, and 12 mm wide.

This is one of the spindle bearing for the HiTorque micro mill.

For a chart showing all bearings and machine replacement requirements, click HERE

*NOTE: These are high-quality NSK, NTN, Nachi, or equivalent brand, permanently lubricated and sealed bearings.

Before you pay

Check the method and total at checkout.

When it ships

Allow for processing time as well as the journey to you.

Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

View policy

If you need a refund

Keep your order number and contact the store to start.

Please contact us for the refund processing timeframe before returning an item.

View policy

Delivery costs

Review the cost for your destination and chosen service.

Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

View policy

Returning an item

Check the return conditions before sending anything back.

United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

View policy

Customer Reviews (5.0 / 5 · 5 reviews)

Sophia Y. ★★★★★ Oct 22, 2026

The 6004-2RS dimensions match the spec sheet exactly, so it dropped right into the spindle housing with zero fuss. My micro mill's headstock runs quiet now, and the sealed rubber shields keep the dust out during aluminum jobs.

Samuel ★★★★★ Oct 21, 2026

My spindle was getting noisy and after checking the spec sheet I saw this 6004-2RS is 20mm ID by 42mm OD, which matched perfectly. The shielded design kept the grease in place during installation, and the mill runs smoother than it has in months.

Ellie Q. ★★★★★ Oct 20, 2026

Replaced the old spindle bearing on my micro mill and the 20mm bore slid right onto the shaft with zero play. Runs smooth and quiet, and the 12mm width matches the original exactly.