

🏁 Unlock race-grade power with ACL’s precision main bearing set!
The ACL 5M1959H-STD Main Bearing Set is a race series, alloy steel ball bearing engineered for Honda and Acura B and K series engines. Proudly made in Australia, it offers precision fitment, ISO 355 certification, and lightweight durability, making it an essential upgrade for performance-driven professionals.
| Brand | ACL |
| Material | Alloy Steel |
| Item dimensions L x W x H | 6.5 x 2.8 x 1 inches |
| Item Weight | 0.5 Pounds |
| Bearing Number | 5M1959H |
| Specification Met | ISO 355 |
| Bearing Type | Ball Bearing |
| Compatible Lubricant | Grease |
| UPC | 191215036479 |
| Manufacturer | ACL |
| Model | Universal |
| Item Weight | 8 ounces |
| Product Dimensions | 6.5 x 2.8 x 1 inches |
| Item model number | 5M1959H-STD |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | 5M1959H-STD |
| OEM Part Number | 5M1959H-STD |
R**D
Boost Projects Seller
Amazing seller!! I ordered it Thursday and Engine Bearings were delivered Monday (from California to Florida). I have used ACL on all my high performance engines.
A**N
Main bearings for my B18B1
With a name like ACL, these main bearings were a go to when I refreshed the bottom end of my B18B1. The crankshaft needed to be replaced due to oil starvation, which caused gouging in the journals of my crankshaft, so the bearings had to be replaced as well. I've put 50k miles on my refreshed engine with absolutely no issues.
J**S
Doing good
Trucking along since install have about 1000 miles so far. No issues here
J**.
Finish is questionable
I would probably buy from a reputable performance shop. I have that gut feeling I’m going to regret running them. Definitely better looking then the rod bearings I ordered and will not use.
J**N
Good quality
I purchased main bearings. Received only the connecting rod bearings. Checked with calipers. Right on the money exact same size as originals, great packaging and arrived quickly. Clean smooth bearings. Only issue I ordered main bearings and didn't recieve them. Fast professional customer service. Zero issues other then I didn't recieve the main bearings. Honest human error. So for this reason I give them a 5 star because the bearings were spot on. Next build I will be using them again. And hopefully I'll get the main bearings too lol. I did get full refund very quickly.
Trustpilot
1 week ago
2 weeks ago