How To Determine Blue Ox Spring Bar Weight Capacity

Question

Question:

How can you tell what size spring Blue Ox bars you have?

asked by: Barry P

0

Expert Reply:

Blue Ox has an easy system for determining the weight capacity of your spring bars, whereas other companies may use measurements or printed capacity to assist. With Blue Ox, there is a 5 dimple system: No dimples means it is rated for up to 350 lbs total tongue weight. One dimple means it is rated for up to 550 lbs. Two dimples indicates up to 750 lbs. Three dimples indicates up to 1,000 lbs. Four dimples indicates up to 1,500 lbs tongue weight. Five dimples indicates up to 2,000 lbs total tongue weight.

I've attached videos of a couple of these sizes so you can see these dimples/notches.

350 to 550 lbs # BXW4005
550-750 lbs # BXW4006
750 to 1,000 lbs # BXW4007
1,000 to 1,500 lbs # BXW4008
1,500 to 2,000 lbs # BXW4014

expert reply by: Jason S

0

click to enlarge

Jamie H.

8/17/2025

Ok Jason, thank you. In your example above, the bar has 3 dimples indicating 1000 lbs... Is that 1000 lbs/bar (2000 lbs) for the system? or is it 1000 lbs total (ie. 500 lbs per bar)? Thank you

Robin H.

8/18/2025

@JamieH in this case the three would be for the # BXW4007. The pair of bars is rated for 750-1,000 lbs of tongue weight. These would be found on the Blue Ox SwayPro # BXW1000.

Rod H.

7/8/2026

@RobinH Can I replace the bxw4007 to the bxw4008 bars?

Robin H.

7/9/2026

@RodH yes you can switch to the # BXW4008.

Mary

9/6/2026

The hitch weight capacity (HWC) is different than the tongue weight (TW) which is the actual downward force. We are replacing our trailer. Both have a gross trailer weight capacity of 5000 lbs, but trailer 1 is 4100lbs and trailer 2 is 3850lbs. Trailer 1 has a 650lb HWC, trailer 2 has a 550lb HWC. Can I use the same spring bars for both trailers?

Jerred H.

9/6/2026

@Mary Yes, you can use the 550-750 lbs bars item # BXW4006 on both of your trailers.

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Answer 2

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Answer 4

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Answer 6

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Answer 7

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Answer 12

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How To Determine Blue Ox Spring Bar Weight Capacity

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