ACL main bearing set — manufacturer catalog product photo
ACL engine bearing-shell profile drawing — shell shape and oil-hole layout
ACL engine bearing-shell profile drawing — shell shape and oil-hole layout
Click to zoom in

ACL Acura B17A1/B18A1/B18B1 / B18C1/B18C5 VTEC / Honda K20A3/K20A2/K24A 0.025mm Overzized High Perfo

$ 126.94
$ 126.94

ACL 5M1959H-.025 is a main bearing set for the cataloged Honda B16A1, B16A2, B16A3, B16A4 engine configurations. .025 mm journal repair-size designation. Confirm the required undersize journal diameter and assembled clearance with the engine builder.

Bearing Configuration

H identifies the ACL Race Series family. Match the complete suffix to the required clearance, shell width and locating features.

Engine Application

Manufacturer / Engine Honda — B16A1
Manufacturer / Engine Honda — B16A2
Manufacturer / Engine Honda — B16A3
Manufacturer / Engine Honda — B16A4
Manufacturer / Engine Honda — B16A6
Manufacturer / Engine Honda — B16B
Manufacturer / Engine Honda — B17A1
Manufacturer / Engine Honda — B18A1
Manufacturer / Engine Honda — B18B1
Manufacturer / Engine Honda — B18B2
Manufacturer / Engine Honda — B18C1
Manufacturer / Engine Honda — B18C2
Manufacturer / Engine Honda — B18C5
Manufacturer / Engine Honda — B18C7
Manufacturer / Engine Honda — B20B3
Manufacturer / Engine Honda — B20B4
Manufacturer / Engine Honda — B20B8
Manufacturer / Engine Honda — B20Z2
Manufacturer / Engine Honda — K20A2
Manufacturer / Engine Honda — K20A3
Manufacturer / Engine Honda — K20Z1
Manufacturer / Engine Honda — K24A1
Manufacturer / Engine Honda — K24A3
Manufacturer / Engine Honda — K24A4
Manufacturer / Engine Honda — K24A8
Manufacturer / Engine Honda — K24Z1

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.

Specifications

Brand ACL
Manufacturer Part Number 5M1959H-.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 Upper & lower
Catalog Size Options STD, .025, .25

Quantity and Assembly Checks

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.

Frequently Asked Questions

Is the year and model enough to choose this bearing? No. Match 5M1959H-.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.

Related Engine Parts

Shop ACL engine components, engine bearings and oil pumps.

ACL Performance Parts

ACL Performance Parts

Shop ACL engine bearings, Race Series rod and main bearings, thrust components, bushings and selected oil pumps at Black Ops Auto Works. Build your parts list around the engine you are rebuilding, then compare Race Series H, extra-clearance HX and the available repair-size configurations with your engine builder’s requirements.ACL Race Series Engine BearingsACL Race Series bearings give engine builders application-specific choices for performance engine assembly. H and HX configurations let you select the specified bearing family and oil-clearance option, with additional designs available for selected engines. The right choice starts with the planned engine build and the measured components rather than a universal bearing upgrade.Shop ACL Engine Parts Connecting-rod bearings: service the crankshaft’s rod journals with the set or individual pair specified for your engine. Main bearings: support the crankshaft in the block; compare complete sets and selective-grade listings where of...

View ACL Performance Parts Products
Acura Integra Parts and Accessories

Acura Integra Parts and Accessories

Shop Acura Integra performance parts and accessories for a classic LS, GS-R or Type R project, or a modern turbocharged Integra and Type S build. Compare AWE and GReddy exhaust applications, intake systems, Seibon carbon-fiber body components, brake parts and drivetrain upgrades. Choose the parts that suit the sound, appearance or service goal for your generation of Integra.Acura Integra Parts for Classic and Modern BuildsThe Integra range brings together very different projects: a classic B-series car, a modern 1.5-liter turbo liftback and the DE5 2.0-liter turbo Type S. Start with the build you want to improve, then compare the product families offered for that engine, body and generation. A classic restoration, a street exhaust change and a higher-output drivetrain build call for different choices.Shop Acura Integra Performance Parts Exhaust systems: compare AWE Touring and Track Edition applications for modern cars and GReddy Supreme SP listings for selected classic Integras. ...

View Acura Integra Parts and Accessories Products
Acura RDX Parts and Accessories

Acura RDX Parts and Accessories

Shop Acura RDX parts and accessories for brake service, replacement dampers, exhaust work and everyday maintenance. Explore DFC brake components, PowerStop brake packages, KYB suspension applications and selected MagnaFlow exhaust listings. Choose the parts for your next repair or upgrade, then narrow the application to your RDX’s generation and equipment.Shop Acura RDX Parts Brake pads and rotors: select individual DFC components for the front or rear axle being serviced. Brake kits and calipers: review PowerStop packages when the job calls for more than pads alone. Shocks, struts and service parts: compare KYB applications for a suspension refresh, including separately listed boots and mounts. Exhaust components: review the MagnaFlow BRE listing for its specified 2010–2012 2.3-liter RDX application. Lighting and service accessories: shop the listed bulbs, batteries and related replacement items for routine upkeep. Choose Your RDX Brake PackageIndividual pads and rotors let yo...

View Acura RDX Parts and Accessories Products
Acura RSX Parts and Accessories

Acura RSX Parts and Accessories

Shop Acura RSX performance parts and accessories for an intake or exhaust upgrade, a carbon-fiber appearance project or a manual-drivetrain build. Explore Invidia cat-back systems, Injen intake applications, Seibon hoods, Action Clutch kits, brake components and chassis parts. Choose your RSX base or Type-S application and build a parts list around the change you want to make.Shop Acura RSX Performance Parts Cat-back exhausts: compare Invidia Type-S applications, including the listed Q300 system, by configuration and tip style. Intake systems: explore Injen short ram and cold air applications for the base RSX and Type-S. Carbon-fiber hoods: compare the Seibon OE-style hood application for an exterior project. Clutch and engine parts: review Action Clutch manual-transmission kits and listed K-series engine-build components for the installed combination. Brakes and chassis components: browse pads, rotors, adjustable control-arm applications and suspension-service parts. Intake an...

View Acura RSX Parts and Accessories Products
Acura TSX Parts and Accessories

Acura TSX Parts and Accessories

Shop Acura TSX parts and accessories for an intake upgrade, manual-clutch project or brake refresh. Compare Injen intake applications, Action Clutch and Clutch Masters packages, DFC brake components and selected suspension and service parts. Choose the parts for your sedan or Sport Wagon, keeping the 2.4-liter and V6 applications separate.Shop Acura TSX Performance and Service Parts Intake systems: compare the listed Injen applications for the relevant 2.4-liter year range and installation layout. Clutch packages: review Action Clutch and Clutch Masters kits for the specified manual-transmission engine combination. Brake pads and rotors: select individual components for the front or rear service, then add the hardware required for the job. Calipers and hydraulics: review the listed DFC caliper and master-cylinder applications as separate service components. Suspension and everyday accessories: compare the listed replacements by body application, mounting position and package co...

View Acura TSX Parts and Accessories Products
Bearings

Bearings

Engine and drivetrain bearings for domestic, import, and diesel platforms are stocked at Black Ops Auto Works. Shop main bearings, rod bearings, cam bearings, thrust bearings, wheel bearings, pilot bearings, transmission bearing kits, and differential bearing sets for HEMI 5.7, 6.1, 6.4, and 6.2 supercharged engines, LS and LT platforms, Coyote V8s, Duramax, Cummins, and Power Stroke diesels, and popular import engines like the VQ35, VQ37, VR38DETT, K20, K24, and 2JZ. Every bearing is filterable by year, make, model, engine code, and bearing clearance so the correct part ships the first time. Black Ops Auto Works carries 1250 bearing SKUs across engine internals, transmission and transfer case hardware, differential components, and wheel end assemblies. What This Category Covers Bearings are the precision-fit wear surfaces that keep an engine, transmission, and axle assembly spinning true under load. A correctly sized bearing set with the right clearance is one of the most impor...

View Bearings Products
Engine

Engine

Shop automotive engine parts, cooling-system components, oil-system upgrades, ignition parts, pulleys, sensors, gaskets, fuel components, and engine-bay accessories at Black Ops Auto Works. This collection covers vehicle-specific replacement parts, performance upgrades, supporting hardware, and universal components for street cars, trucks, SUVs, Jeeps, diesel vehicles, off-road builds, and motorsport applications. Engine Parts and Performance Components The Engine collection brings together components used throughout the engine, lubrication system, cooling system, ignition system, fuel system, crankcase ventilation, accessory drive, and engine compartment. Available products range from replacement sensors and gaskets to rotating-assembly parts, performance cooling systems, supercharger pulleys, catch cans, cylinder heads, camshafts, intake manifolds, and engine-bay dress-up components. Engine compatibility cannot be determined from vehicle model alone. Confirm the exact year, make, ...

View Engine Products
Engine Block

Engine Block

Engine block parts and internals for HEMI, Hellcat, Trackhawk, TRX, LS, LT, Coyote, EcoBoost, K-Series, VR38DETT, and Cummins diesel builds are stocked at Black Ops Auto Works. Shop main and rod bearings, engine gaskets and gasket kits, engine mounts, block off plates, block heaters, PCV valves, sleeves, engine covers, and complete engines. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 2,187 engine block SKUs across rotating assembly, sealing, mounting, and engine bay dress-up categories. What This Category Covers The Engine Block collection groups the internal and structural components that make up the bottom end and block assembly of a performance or OEM-replacement engine. Coverage spans bearings for rotating assembly refreshes, gaskets and gasket kits for sealing rebuilds, engine mounts for swap and performance builds, and engine bay dress-up pieces for HEMI, Hellcat, and ...

View Engine Block Products
Honda Accord Parts and Accessories

Honda Accord Parts and Accessories

Shop Honda Accord parts for intake upgrades, clutch work, brake maintenance and suspension projects at Black Ops Auto Works. Compare Injen intake applications, Action Clutch or Clutch Masters kits and brake-service choices. Build an order around your Accord generation, engine, body and transmission.Intake and Engine-Service ChoicesInjen references name specific applications such as the 2018–2020 1.5L turbo Accord and earlier four-cylinder models. Compare full engine coverage, routing and package contents before choosing an intake. Fuel-system, gasket and other engine references have separate interfaces and calibration requirements; match the actual engine and existing modifications with your builder or tuner.Clutch Kits and FlywheelsAction Clutch and Clutch Masters listings span different engines and manual transmissions, including separate 1.5T, 2.0T and V6 applications. Compare intended use, friction arrangement and the flywheel specified for the kit. Aluminum, chromoly and OE-HD ...

View Honda Accord Parts and Accessories Products
Honda Civic Parts and Accessories

Honda Civic Parts and Accessories

Shop Honda Civic parts for exhaust upgrades, clutch service, suspension projects and exterior changes at Black Ops Auto Works. Compare AWE exhaust references, Action Clutch kits, Bilstein struts and Seibon panels. Choose around your exact Civic generation, body, engine and trim, including the separate requirements of Si and Type R applications.Exhaust, Intake and Engine ProjectsAWE Touring and Track references distinguish FC1/FC3 Si, FE1 Si and FK8 or FL5 Type R applications, with different layouts and tip choices. Compare manufacturer sound information, routing and complete contents within the matched application. Intake, fuel-hanger and engine references serve separate projects; verify the actual engine, connections and calibration plan before pairing modifications.Clutch and Transmission WorkAction Clutch references cover different generations and engines with separate stage and flywheel combinations. Match transmission, engine, flywheel and release-system requirements first, the...

View Honda Civic Parts and Accessories Products
Honda CR-V Parts and Accessories

Honda CR-V Parts and Accessories

Shop Honda CR-V parts for brake maintenance, suspension service and interior or exterior care at Black Ops Auto Works. Compare Bilstein strut applications, PowerStop brake-kit references, 3D MAXpider Kagu coverage and Rally Armor mud flaps. Select parts for the exact generation, powertrain and equipment in your CR-V.Brake Kits and Service ComponentsCompare applicable PowerStop, Brembo, DFC or EBC references by axle and installed brake assembly. Rotor, pad, caliper and drum-service listings have different applications and contents. Match production range, caliper and dimensions before comparing a complete axle-service package with individual replacements.Struts, Shocks and Chassis WorkBilstein B4 and B6 references name different production ranges, assemblies and positions. A rear mount, individual shock and front strut are different service components. Match factory suspension, current ride height and correct side before planning replacement. Cusco strut-bar and other chassis referen...

View Honda CR-V Parts and Accessories Products
Honda Element Parts and Accessories

Honda Element Parts and Accessories

Explore Honda Element parts for suspension service, exhaust changes, brake maintenance and engine projects at Black Ops Auto Works. Compare KYB Strut-Plus assemblies, Tein coilover applications, Gibson exhaust references and AVS window deflectors. Choose the exact production, trim and installed equipment before building the order.KYB Assemblies and Suspension ProjectsKYB references distinguish front and rear and left or right Strut-Plus assemblies; front listings note an SC exclusion. The Tein Street Basis Z reference names a separate YH1/YH2 application range. Compare a service replacement with a complete height-change project using full coverage, package contents and alignment or supporting-component requirements.Exhaust and Brake ServiceA Gibson single-exit cat-back reference names a 2006–2011 Element 2.4L application, while MagnaFlow exhaust or converter references have their own scope and coverage. Review routing and supplied sections before choosing a system. Brembo rear-rotor...

View Honda Element Parts and Accessories Products
Military & First Responder Discounts

Military & First Responder Discount Program

Black Ops Auto Works proudly honors active duty military, veterans, National Guard, reserves, police officers, firefighters, and EMTs with an exclusive 5% discount on all performance parts and carbon fiber upgrades. Verify instantly and start saving today.

Learn More & Apply

Your cart

×