Size Chart
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ACL 5M1957H-.025 is a main bearing set for the cataloged Honda B18A (USA), B18A, B20A, B20A1 engine configurations. .025 mm journal repair-size designation. Confirm the required undersize journal diameter and assembled clearance with the engine builder.
H identifies the ACL Race Series family. Match the complete suffix to the required clearance, shell width and locating features.
ACL’s 2023 guide lists 5M1957 mains across several distinct engine groups, including D16A/D16B/D16W/D16Y/D16Z, D17A/D17Z, B18A/B20A SOHC, B20A/B21A/B21A1 DOHC, 1998-on F23A/F23Z and 1998-on H22A/H22Z. The rod-bearing families differ between these groups. For example, B18A/B20A SOHC uses 4B1946 rods, while the listed B20A/B21A/B21A1 DOHC applications use 4B1936. A shared main-bearing family does not establish rod-bearing interchangeability.
| Manufacturer / Engine | Honda — B18A (USA) |
|---|---|
| Manufacturer / Engine | Honda — B18A |
| Manufacturer / Engine | Honda — B20A |
| Manufacturer / Engine | Honda — B20A1 |
| Manufacturer / Engine | Honda — B20A2 |
| Manufacturer / Engine | Honda — B20A3 |
| Manufacturer / Engine | Honda — B20A4 |
| Manufacturer / Engine | Honda — B20A5 |
| Manufacturer / Engine | Honda — B20A6 |
| Manufacturer / Engine | Honda — B20A7 |
| Manufacturer / Engine | Honda — B20A8 |
| Manufacturer / Engine | Honda — B20A9 |
| Manufacturer / Engine | Honda — B21A |
| Manufacturer / Engine | Honda — B21A1 |
| Manufacturer / Engine | Honda — D16A1 |
| Manufacturer / Engine | Honda — D16A3 |
| Manufacturer / Engine | Honda — D16A6 |
| Manufacturer / Engine | Honda — D16A7 |
| Manufacturer / Engine | Honda — D16A8 |
| Manufacturer / Engine | Honda — D16A9 |
| Manufacturer / Engine | Honda — D16B2 |
| Manufacturer / Engine | Honda — D16B6 |
| Manufacturer / Engine | Honda — D16W1 |
| Manufacturer / Engine | Honda — D16Y1 |
| Manufacturer / Engine | Honda — D16Y4 |
| Manufacturer / Engine | Honda — D16Y5 |
| Manufacturer / Engine | Honda — D16Y7 |
| Manufacturer / Engine | Honda — D16Y8 |
| Manufacturer / Engine | Honda — D16Z2 |
| Manufacturer / Engine | Honda — D16Z5 |
| Manufacturer / Engine | Honda — D16Z6 |
| Manufacturer / Engine | Honda — D17A1 |
| Manufacturer / Engine | Honda — D17A2 |
| Manufacturer / Engine | Honda — D17A6 |
| Manufacturer / Engine | Honda — D17A7 |
| Manufacturer / Engine | Honda — D17Z1 |
| Manufacturer / Engine | Honda — F23A1 |
| Manufacturer / Engine | Honda — F23A4 |
| Manufacturer / Engine | Honda — F23A5 |
| Manufacturer / Engine | Honda — F23A7 |
| Manufacturer / Engine | Honda — F23Z2 |
| Manufacturer / Engine | Honda — F23Z4 |
| Manufacturer / Engine | Honda — H22A4 |
| Manufacturer / Engine | Honda — H22A5 |
| Manufacturer / Engine | Honda — H22A7 |
| Manufacturer / Engine | Honda — H22A8 |
| Manufacturer / Engine | Honda — H22Z1 |
| Manufacturer / Engine | Honda — ZC |
The engine-family list identifies catalog applications, not universal vehicle fitment. Confirm the exact engine version, crankshaft, rods, block and bearing location. Vehicle names and photos do not replace dimensional verification.
| Brand | ACL |
|---|---|
| Manufacturer Part Number | 5M1957H-.025 |
| Component | Main Bearing Set |
| Size Selection | .025 mm journal repair-size designation. Confirm the required undersize journal diameter and assembled clearance with the engine builder. |
| Catalog Family | ACL Race Series |
| Half Type | Identical halves |
| Catalog Size Options | STD, .025, .25 |
Confirm the set contents, bearing positions and any separate thrust components against the complete manufacturer number. The photo is representative of the part family.
Measure shaft journals, housing bores and assembled oil clearance using the engine builder’s specification. Check oil-hole alignment, groove placement and crankshaft fillet clearance before final assembly. Catalog standard dimensions must not be treated as the finished dimensions for a different repair size. ACL specifies that abrasive pads or paper must not be used on the bearing surface to alter oil clearance.
Is the year and model enough to choose this bearing? No. Match 5M1957H-.025 to the exact engine and measured build specification.
What size is this listing? .025 mm journal repair-size designation. Confirm the required undersize journal diameter and assembled clearance with the engine builder.
Can I substitute a different suffix? Compare the complete grade, size, locating features and assembled clearance before substituting any bearing.
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