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Description
Hoffman Ball Bearing 3-3/4 to 4" Tapered Bore x 8-1/4" OD x 1-3/4" (SKF RM30K)Hoffman Self Aligning Ball Bearing 3 3 4" ID Nominal Tapered Bore (1: 12) x 8 1 4" OD (Equal to SKF RM30K). The smaller side (3. 750") is the nominal bore size. The larger side (4. 000") is the mouth of the taper. This style is not meant to mount directly on a straight 4" shaft its designed to mount on an adapter sleeve that matches your shaft size (commonly 3 1 4" or 3 1 2" shafts for RM30K). Type: Self aligning double row ball bearing tapered bore
Hoffman Self Aligning Ball Bearing 3-3/4" ID Nominal Tapered Bore (1:12) x 8-1/4" OD (Equal to SKF RM30K).
The smaller side (3.750") is the nominal bore size.
The larger side (4.000") is the mouth of the taper.
This style is not meant to mount directly on a straight 4" shaft — it’s designed to mount on an adapter sleeve that matches your shaft size (commonly 3-1/4" or 3-1/2" shafts for RM30K).
Type: Self-aligning double row ball bearing tapered bore
Bore: 3.75" nominal (tapered 1:12, 4" at the mouth)
OD: 8.25" (≈ 209.55 mm)
Width: 1.75" (≈ 44.45 mm)
Country of manufacture: England
Weight: 16.9 lbs
The larger side (4.000") is the mouth of the taper.
This style is not meant to mount directly on a straight 4" shaft — it’s designed to mount on an adapter sleeve that matches your shaft size (commonly 3-1/4" or 3-1/2" shafts for RM30K).
Type: Self-aligning double row ball bearing tapered bore
Bore: 3.75" nominal (tapered 1:12, 4" at the mouth)
OD: 8.25" (≈ 209.55 mm)
Width: 1.75" (≈ 44.45 mm)
Country of manufacture: England
Weight: 16.9 lbs
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 23 reviews
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Product Reviews
★★★★★ 5
Great for emergency roadside tire changes
Size: 14" Chrome
Great product and fast shipping - gotta love Amazon
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Reviewed in the United States on April 15, 2026
★★★★★ 5
Lug wrench excellence
Size: 14" Chrome
Well made, sturdy, easy to use, balanced. Great value for price. Would buy again.
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Reviewed in the United States on February 9, 2026
★★★★★ 5
Fits and works well
Size: 14" Black
Fits and works well
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Reviewed in the United States on May 11, 2026
★★★★★ 5
Simple
Size: 14" Chrome
Small and easy to use
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Reviewed in the United States on May 14, 2026
★★★★★ 5
Perfect thing to have around the farm💯
Color: Red
This little power house is great to have in your truck, car, or around the farm. I lover that it is so simple to use, will jump everything I have running on the farm, I can almost pump any tire too w/out having to grab the air compressor.powerful battery will run the jump starter, air compresser, has connections to power phone and other devices, all in a compact design. It even has it's own light with a blue
Lit gauge screen on the front. Oh yea, and the carry bag is a nice touch. Gotta give this one 👍👍 way up 💯
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Reviewed in the United States on May 25, 2026
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