Best Black and Decker Lawn Mower Blade for Easy Replacement

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black and decker lawn mower blade replacements are model-specific parts, so the right choice depends on your exact mower model and part number. This guide helps you match a blade to mowers such as the CM2040 series, MM2000, CM1640, CM1936 series, CMM1200, MM675, LM175, and BEMW models. You will learn how to check compatibility, length, center-hole fit, and blade function before you order. The listings below cover common Black and Decker cordless and corded mower blades, plus one mulching option with full dimensions. Use the model lists and part numbers to narrow your pick, then confirm fit in your manual.

Quick answer

At a glance: which part number fits which model

Part number	Fits these models	Weight	Size notes
5140161-49	CM2040, CM2043C, CM2045, CM2060C, MM2000	1 lb	Spec table and bullets give conflicting length — confirm before ordering
N520727	BEMW472BH, BEMW472ES only	10.2 oz	No length, width, or hole size stated
5140150-05	CM1640 Type 1 only (not other CM1640 Types)	11.2 oz	No width, thickness, or hole size stated
USMB-BD-18BP-002 (replaces 90548199)	MM675, LM175, CM1836 (18-inch deck models)	2.49 lb	17-1/2 in length, 1 in center hole, low-lift 3/8 in mulching blade — fullest size data of the five
90541433-01 (cross-ref Rotary 16541)	CM1936, CM1936Z, CM1936ZF2, CMM1200	1.1 lb	Spec table shows placeholder 1x1x1 in — confirm length with seller; no width or hole size stated

Figures are exactly as stated in each listing, checked 2026-10-10. Each part fits only the specific models listed — match your mower’s model number (found on the deck or in the manual) to the correct part number before ordering, since none of these five blades is a universal fit across the different Black+Decker series.

If you need a black and decker lawn mower blade, start with the part number in your manual. For CM2040, CM2043C, CM2045, CM2060C, and MM2000 models, look for part 5140161-49. For CM1936, CMM1200, and SPCM1936 models, part 90541433-01 is the listed match. For CM1640 Type 1, part 5140150-05 is listed. For 18-inch deck models MM675, LM175, and CM1836 Type 1 and 2, the USA-made 17-1/2 inch low-lift mulching blade lists those models. Check length, hole size, and included parts before ordering.

What matters for a Black and Decker mower blade

A mower blade is not universal. Small differences in length, mounting holes, and deck width prevent safe use. These five checks help you decide.

1. Exact model match

Every pick below lists compatible mower models in its bullets. Match your mower letters and numbers exactly, including Type numbers where shown. As an illustration, the listing for part 5140150-05 states compatibility only with CM1640 Type 1. If your mower is a different Type, check the product listing and your manual. For help with corded models, see Best Black and Decker 3 in 1 Mower Corded.

2. Part number match

Black and Decker uses part numbers such as 5140161-49, N520727, N520728, 5140150-05, 90548199, and 90541433-01. The part number is the strongest fit signal. If your old blade or manual shows 90541433-01, choose a listing that names that number for CM1936 and CMM1200 models. Do not substitute a different part number unless the listing states cross-compatibility.

3. Blade length and deck width

Length must suit the deck. The USA-made blade lists 17-1/2 in. length for 18-inch decks, with 1-3/4 in. width and 0.150 in. thickness. The 5140161-49 replacement lists approximately 18.5 X 2.00 X 0.02 inches in its bullets, while its spec table lists 14 x 2 x 0.02 inches, so the two fields contradict each other and you should rely on neither number until you confirm with the seller. Use these figures to compare with your manual.

4. Mounting holes and center hole

Mounting style matters as much as length. The USA-made blade states a 1 in. center hole. If your manual does not show hole size, remove the battery or unplug the mower, then check the existing blade markings or ask the manufacturer. Never enlarge or modify holes.

5. Blade function and what is in the box

Some blades are standard replacements and some are mulching blades. The USA-made option is described as a low lift 3/8 in. mulching blade. Other listings describe a standard replacement or mulch blade without lift details. Also check package quantity. Most listings here state an item package quantity of 1 or an included blade, while one listing states Included Components as No. Confirm hardware, covers, and fasteners before you order.

Products that fit this guide

The write-ups below summarize fit, size details, and limits from each listing. Review your model number first, then read the one or two options that name your mower.

Replacement for 5140161-49 for CM2040 series and MM2000

This pick fits owners of CM2040, CM2043C, CM2045, CM2060C, and MM2000 mowers who need part 5140161-49. The bullets name those models and describe it as a replacement blade with part number 5140161-49. The spec table lists 1 pounds item weight and 14 x 2 x 0.02 inches product dimensions, while the bullets state approximately 18.5 X 2.00 X 0.02 inches. Those two length figures contradict each other, so rely on neither number and confirm length with the seller and your manual. The listing states item package quantity of 1. It does not state blade material beyond spec-table entries, and it does not state mounting-hole size. Skip this pick if your mower is not in the listed model group or your manual calls for a different part number. For related corded coverage, see Best Black Decker Lawn Mower Corded 13 Amp 20 Inch Mm2000.

OEM N520727 replacement for BEMW472BH and BEMW472ES

This pick suits owners of BEMW472BH and BEMW472ES mowers. The bullets state compatibility with BEMW472BH and BEMW472ES and name part number N520727. The listing identifies the manufacturer as Black and Decker and the item model number as N520727. It lists 10.2 ounces item weight and 1 x 1 x 1 inches product dimensions. The 1 x 1 x 1 inches size does not describe usable blade length, so check the listing for length details. The listing does not state blade length, width, thickness, hole size, or package quantity. Skip this pick if you own a CM or MM series mower, because this listing names only the two BEMW models above. Owners comparing battery platforms can also read Best Black and Decker Battery Powered Mower.

OEM 5140150-05 replacement for CM1640 Type 1

This option is for CM1640 Type 1 owners who need part 5140150-05. The bullets describe it as a replacement blade with part number 5140150-05 and compatibility with CM1640 Type 1. The listing states 11.2 ounces item weight and 16 x 4 x 4 inches product dimensions. The dimension figure describes package or listing dimensions rather than confirmed cutting length, so confirm cutting length in the manual. The listing does not state width, thickness, center-hole size, or blade function. It does not state package quantity beyond a single replacement description. Skip this pick if your mower is CM1640 of another Type or any CM1936, CM2040, or MM series model. If you are sorting out cordless power needs, see Best Black and Decker 36v Cordless Mower.

USA-made low-lift mulching blade for 18-inch decks

This blade fits MM675, LM175, and CM1836 Type 1 and 2 mowers with 18-inch decks. The bullets state those models and describe it as a low lift 3/8 in. mulching blade that replaces 90548199 and 90548199-01. It gives full size details: 17-1/2 in. length, 1-3/4 in. width, 0.150 in. thickness, and 1 in. center hole. The spec table lists 2.49 pounds item weight and 18 x 4 x 4 inches product dimensions. The listing states it is made in the USA. This is the most dimensionally complete pick in this guide, which helps you verify deck and arbor fit. Skip this pick if your mower uses part 5140161-49, 90541433-01, N520727, or 5140150-05, or if your deck is not 18 inches. For background on the black decker 3 in 1 corded lawn mower layout, see Best Black and Decker 3 in 1 Mower Corded.

Rotary replacement for 90541433-01 for CM1936 and CMM1200

This blade is for CM1936 and CMM1200 owners who need part 90541433-01. The title names Black and Decker 90541433-01 CM1936 CMM1200 19 inch sizing, and the bullets name genuine Rotary part 16541. The listing shows 1 x 1 x 1 inches product dimensions. That size figure does not describe blade length, so use the 19 inch reference in the title and confirm with the manual. The listing does not state width, thickness, hole size, or package quantity. Skip this pick if your mower is in the CM2040, MM2000, CM1640, MM675, or BEMW groups. Battery owners can also review Best Lawn Mower Battery Voltage and Amps.

How to choose the right Black and Decker blade

Use this sequence to avoid ordering the wrong part.

Check the model plate first. Look under the deck cover, on the rear, or in the manual for the full model plus Type number. Write down CM, MM, LM, BEMW, or SPCM numbers exactly. A CMM1200 Type 3 blade does not automatically fit every CMM1200 unless the listing names that Type.

Match the part number second. Owner manuals and the old blade often stamp the part number near the center hole. If the number reads 90541433-01, limit your search to listings that name that number and your model group. If it reads 5140161-49, stay within that group.

Compare length and holes third. Length controls tip clearance inside the deck. Center-hole diameter and side-hole spacing control mounting. When a listing gives full figures, such as 17-1/2 in. length with a 1 in. center hole, compare them line by line with your manual. When a listing gives only 1 x 1 x 1 inches, treat that as missing size information and ask the seller.

Confirm quantity and hardware fourth. Most replacement blades ship as a single blade. The listings here do not promise bolts, washers, or adapters unless stated. Reuse only hardware your manual says is reusable, tightened to the manual torque pattern.

Replace the blade safely fifth. A US consumer product safety standard for walk-behind power mowers addresses blade-contact injury risk and sets labeling and performance requirements, including shield tests. Disconnect power before blade work. For cordless mowers, remove the battery pack. For corded mowers, unplug the mower. Follow the manual for blocking the blade, bolt direction, and disposal of the old blade.

Converting a listed length and checking tip clearance shows why length and deck width matter. It uses only figures stated in the listings above.

Assume a mower with an 18-inch deck and the USA-made blade.

• USA-made blade length: 17-1/2 in.
• USA-made deck reference: 18-inch decks
• Conversion used here: 1 in. equals 25.4 mm

Step-by-step arithmetic

Step 1: Convert the USA-made blade length to millimeters. Multiply 17.5 in. by 25.4 mm per in. Break it down as 17 x 25.4 equals 431.8 mm, plus 0.5 x 25.4 equals 12.7 mm. Add 431.8 plus 12.7 to get 444.5 mm. As a cross-check, 17.5 x 25 equals 437.5, plus 17.5 x 0.4 equals 7.0, which also gives 444.5 mm.

Step 2: Check tip clearance for the USA-made blade in its 18-inch deck reference. Subtract 18.0 minus 17.5 to get 0.5 in. total clearance. Divide 0.5 by 2 to get 0.25 in. per side if centered. Check: 17.5 plus 0.5 equals 18.0 in.

Common mistakes when buying a mower blade

1. Ordering by deck width alone. An 18-inch deck reference does not prove that every 18-inch blade fits. Mounting holes and part numbers still decide fit.
2. Ignoring Type numbers. Listings that say Type 1, Type 3, or Type 4 mean those variants were checked. A CMM1200 Type 3 listing may not cover an unlisted Type.
3. Trusting the 1 x 1 x 1 inches size lines as cutting size. That figure does not describe cutting length. Ask the seller for length, width, and hole size.
4. Mixing standard and mulching blades without checking the manual. Mulching blades have different lift and thickness. Use only the function your manual allows.
5. Reusing worn hardware. If the manual calls for a new bolt or specific tightening steps, follow it. A loose blade can damage the deck and create a hazard.

Blade care and safety notes

Keep the manual nearby during replacement. Disconnect the battery or unplug the cord before touching the blade. Wear heavy gloves and block the blade with a wood block as directed. Keep hands and feet away from the deck opening. The cited safety standard notes that shields on walk-behind rotary mowers are tested so a foot probe cannot enter the blade path and must withstand a 50 lb static tensile force applied for at least 10 seconds. That test describes mower design, not a home check. Do not straighten a bent blade, weld cracks, or drill new holes. Replace a blade that is bent, cracked, deeply nicked, or worn thin at the edge. Store spare blades dry, covered, and out of reach of children. Follow the manual for cleaning grass buildup and for battery storage and charging. Do not attempt battery repair.

FAQ

How do I find my Black and Decker mower model number?

Check the label on the mower housing, rear door, or under the handle, plus the cover page of the manual. Copy the full code, including Type numbers such as Type 1 or Type 3. Use that exact code against the compatibility bullets in the listing.

Will a CM2040 blade fit an MM2000?

The 5140161-49 listings in this guide name CM2040, CM2043C, CM2045, CM2060C, and MM2000 together. If your manual lists 5140161-49 for your specific mower, that grouping supports fit. If your manual lists a different number, do not assume fit.

What does part 90541433-01 fit?

Listings for that number name CM1936 Type 1, CM1936 Type 2, CM1936Z Type 1, CM1936ZF2 Type 1, CMM1200 Type 3, CMM1200 Type 4, and SPCM1936 Type 1. Match both the part number and your Type number.

What size is the USA-made mulching blade here?

The listing states 17-1/2 in. length, 1-3/4 in. width, 0.150 in. thickness, and 1 in. center hole, for 18-inch decks on MM675, LM175, and CM1836 Type 1 and 2. Verify those four figures against your manual before ordering.

Can I use a longer blade for a wider cut?

No. Use only the length your deck and manual allow. A longer blade can strike the deck, overload the motor, and defeat guard clearance. Blades for different decks are not interchangeable: the 18-inch deck models use a 17-1/2 inch blade, while the CM2040 group uses part 5140161-49, so match your own model and part number.

When should I replace the blade instead of sharpening?

Replace the blade if it is bent, cracked, has missing metal, or shows thin or uneven edges that sharpening cannot restore. Follow the manual for inspection intervals and balancing. If you are unsure, ask a service shop.

Bottom line

Choose by part number first, then model and Type, then length and hole fit. If you own a CM2040-group or MM2000 mower, focus on 5140161-49 listings with your model named. If you own CM1936, CMM1200, or SPCM1936 models, focus on 90541433-01 listings. If you own an 18-inch deck MM675, LM175, or CM1836, the dimensionally complete mulching blade is the clearest match. When a listing lacks length or hole data or shows conflicting dimensions, check the product listing and manual before you buy.

Sources

• CPSC walk-behind mower safety standard: defines walk-behind mower scope and blade-contact risk
• Shield and foot-probe test requirements: 50 lb static force test and blade-path protection