Reference

Glossary

Short, plain-English definitions. Each term links to the guides that cover it properly.

1

16 CFR Part 1205 · also walk-behind mower safety standard: The mandatory US Safety Standard for Walk-Behind Power Lawn Mowers. CPSC says consumer walk-behind mowers must comply; a mower is excluded only if it cuts at least 30 inches, weighs at least 200 pounds and, if engine-powered, has at least 8 horsepower. Read more: Mower safety standards and part recalls: CPSC, ANSI, UL and marks

A

Aftermarket part · also replacement part, non-OEM: A part made by a company other than the mower's maker, sold to replace an original part. Its fit comes from its maker's cross-reference or stated measurements, never from the mower brand alone. Read more: OEM vs aftermarket mower blades, Buying mower blades and parts on Amazon and AliExpress: what to check
Air lift · also lift, sail: The raised trailing edge of a blade that moves air and clippings. Oregon records air lift per blade, such as 3/4 in on its 96-347 Gator G3. Read more: Standard vs high-lift vs mulching blades, How to measure a lawn mower blade
ANSI/OPEI B71.1 · also B71.1-2017: The voluntary US safety specification for consumer pedestrian-controlled and ride-on mowers. CPSC's mower voluntary-standards page identifies ANSI/OPEI B71.1-2017. Read more: Mower safety standards and part recalls: CPSC, ANSI, UL and marks
Anti-scalp roller · also deck roller: A roller on the edge of a deck that helps keep it from scalping uneven ground. Exmark's Staris E-Series manual says not to adjust the rollers to support the deck. Read more: Anti-scalp rollers on mower decks
Authorized retailer · also authorized dealer: A seller the maker has approved to sell its products. EGO's warranty applies only to the original purchaser buying from an authorized EGO retailer. Read more: Buying mower blades and parts on Amazon and AliExpress: what to check, EGO mower blade sets

B

Baffle · also mulch baffle: A plate on or under the deck that guides air and clippings. Cub Cadet's 19A70041GFP mulching kit includes a mulch baffle with two mulching blades. Read more: Mulch plug vs mulching kit, John Deere MulchControl kits
Bag frame · also catcher frame: The metal frame a fabric grass bag hangs on. Toro sells its walk power mower bag frame 132-4483-03 without the bag. Read more: Replacement grass bag or bag and frame?, Toro 22-inch Recycler grass bag and frame
Bag only · also fabric only: A replacement grass bag sold without its frame. RYOBI's AC21GB, for example, includes fabric only; the frame is not included. Read more: Replacement grass bag or bag and frame?, RYOBI 40V mower bag AC21GB and blade AC04025
Bagger boot · also boot assembly: The part that joins a riding mower's discharge opening to the bagger hose. Cub Cadet lists boot assembly 731-09329A in the carton of its 42/46-inch double bagger. Read more: Cub Cadet 42 and 46-inch baggers, Bagger weights and missing parts on zero-turn mowers
Bagger kit · also triple bagger, grass collector: A full clipping-collection system for a riding mower: bags, chute or hood, brackets and hardware. Cub Cadet's 19A30056100 triple bagger includes three bags, a chute, deflector, hood, mounting brackets and hardware. Read more: Riding mower bagger fit, Cub Cadet 42 and 46-inch baggers, Grass bags and bagger kits: bag only, bag and frame, or full kit
Blade adapter · also blade hub: The hub that holds a blade on the mower's shaft. Troy-Bilt sells adapters with the same 7/8 in or 25 mm bore in different heights, so the bore alone does not identify the adapter. Read more: Mower blade adapters: bore, height and pulley, Blade bolts, adapters and deck wheels: sizes from the parts list
Blade bolt · also blade screw: The bolt that clamps a blade to its spindle or adapter. Toro's 21465 manual says to check that the blades and blade bolts are not worn or damaged. Use the bolt and torque your mower's manual names. Read more: Mower blade bolts, Blade bolts, adapters and deck wheels: sizes from the parts list
Blade offset · also offset: How far a blade's ends sit above or below its center section. Oregon records it per blade: zero on its 96-347 and 1/4 in on its 91-635. Read more: How to measure a lawn mower blade, Oregon Gator G3, G5 and G6 blades
Blade set · also blade kit: Blades sold together for one deck. Counts differ even at one width: Craftsman sells a 42-inch set of two blades (CMXGZAM110136) and one of a single blade (CMXGZAM110108). Read more: 42-inch riding mower blade sets, Riding and zero-turn blade sets: deck first, then hole and count
Blade thickness · also gauge: How thick the blade steel is. Catalogs give it in inches: Oregon lists 0.164 in for its 92-105 and 0.203 in for its 96-347. Read more: How to measure a lawn mower blade, Oregon Gator G3, G5 and G6 blades
Blade width: The width of the blade's body, measured at its widest flat part near the center. Oregon lists 2.75 in for its 92-105, for example. Read more: How to measure a lawn mower blade
Blades per deck · also blade count: How many blades a deck uses. Oregon lists its 92-105 at three blades for a 48-inch cut and its 91-544 at two, so the deck width does not tell you the count. Read more: Blades per deck and blade length, Deck size blade finder
Bow-tie center hole · also H-pattern: A center hole shaped like a bow tie or the letter H, identified by name rather than measured. Oregon replaces MTD-built walk-behind bow-tie blades with blades whose rectangular hole fits the bow-tie on the blade adapter. Read more: Mower blade center-hole shapes, Mower blade adapters: bore, height and pulley
Bushel: A unit of dry volume that makers use for bagger capacity. Figures are usually totals for the whole bagger, such as Cub Cadet's 6.5 bushels across the two bags of its 19B30031100. Read more: Riding mower bagger fit, Cub Cadet 42 and 46-inch baggers
Bushing · also sleeve: A sleeve that lines a hole so a bolt or axle turns smoothly. In Toro's Z Master 7500-D manual, an anti-scalp roller mounts on a bolt, bushing, roller and flange nut. Read more: Anti-scalp rollers on mower decks, Mower deck wheels: diameter, bore and hub

C

CE marking · also CE mark: The European conformity marking. The European Commission says CE marking does not indicate that a product has been approved as safe by the EU or another authority. Read more: Mower safety standards and part recalls: CPSC, ANSI, UL and marks, Buying mower blades and parts on Amazon and AliExpress: what to check
Center hole · also mounting hole, arbor hole: The hole in the middle of a blade that mounts it to the spindle or adapter. Shapes include round, star, bow-tie, Y-shaped, rectangular and S-shape. Oregon records each hole with a part-specific record, so a hole name alone is not fit. Read more: Mower blade center-hole shapes, Blade center-hole identifier, How to measure a lawn mower blade
Center-hole diameter · also hole size: The inner diameter of a round center hole, which is how round holes are measured. Oregon's 96-347 has a 5/8 in hole and its 91-635 a 3/4 in hole. Read more: How to measure a lawn mower blade, Mower blade center-hole shapes
Chute adapter: A part that lets a bagger chute fit a deck's discharge opening. On Cub Cadet's 50/54-inch double bagger, 50 and 54-inch stamped decks need adapter 731-10133 first. Read more: Riding mower bagger fit, Bagger weights and missing parts on zero-turn mowers
Collection hose · also bagger hose: The tube that carries clippings from the boot to the bags. Cub Cadet's 42/46-inch double bagger uses hose 764-05082, and its 50/54-inch version uses 764-05135. Read more: Cub Cadet 42 and 46-inch baggers, Bagger weights and missing parts on zero-turn mowers
Counterweight · also front weight, bagger weight: Weight added to a mower to offset a bagger. Cub Cadet warns that its front-weight kit is required on compatible zero-turns with its double bagger; EGO says its ABK4200 counterweights balance the bagger for a smooth, stable ride. Read more: Bagger weights and missing parts on zero-turn mowers
CPSC recall · also recall: A recall announced through the US Consumer Product Safety Commission. Example: SureFit's January 2018 recall of aftermarket spindle shafts 504-00341 and 504-00346 sold for John Deere riding mowers. Read more: Mower safety standards and part recalls: CPSC, ANSI, UL and marks, OEM vs aftermarket mower blades
Cross-reference · also replaces, interchange: A maker's list of other part numbers its part replaces. Craftsman says CMXGZAM110136 replaces 532138971, 532138498, 532127843 and 127843, and Oregon cross-references its 92-105 to John Deere GX21784 and others. Read more: Find a mower blade by part number, OEM vs aftermarket mower blades
Cut direction · also left-hand cut, right-hand cut: Whether a blade is made to cut turning left or right. Oregon's online blade catalog lets shoppers filter by left or right-hand cut alongside blade length and center-hole size. Read more: Blades per deck and blade length, How to measure a lawn mower blade
Cutting deck · also mower deck, deck: The housing under a mower that holds the blades and shapes the airflow. Its width is the mower's cutting width. Read more: Deck size blade finder, Blades per deck and blade length

D

De minimis · also duty-free de minimis: The US duty-free exemption for low-value imports. CBP says that from August 29, 2025, goods of all countries are no longer eligible for it, regardless of value or country of origin. Read more: Ordering mower parts from abroad: US duties, Canada taxes and returns
Deck gauge wheel · also gage wheel: A small wheel on the deck that helps keep it off the ground. Cub Cadet's 734-04155 is a 5-inch gauge wheel listed for 42, 46, 50 and 54-inch decks. Read more: Mower deck wheels: diameter, bore and hub, Blade bolts, adapters and deck wheels: sizes from the parts list
Diagonal blade length · also blade length, tip-to-tip length: A blade's length measured from one tip to the opposite tip, corner to corner. USA Mower Blades warns that a straight end-to-end measurement gives the wrong length, and Oregon measures its blades diagonally from the corners. Read more: How to measure a lawn mower blade, Blades per deck and blade length
Discharge chute · also deflector: The guard over the opening where clippings leave the deck. Never remove or bypass it. Toro's 21465 manual says to check the discharge chute often for wear or deterioration. Read more: Mulch plug vs mulching kit, When to replace a lawn mower blade
Double bagger · also twin bagger: A riding-mower bagger with two bags or bins. Capacities are totals: Cub Cadet's 19B30031100 holds up to 6.5 bushels in its two bags, and Husqvarna's 960 73 00-04 lists 6 bushels for two bins. Read more: Cub Cadet 42 and 46-inch baggers, Riding mower bagger fit
Dual-blade system · also upper blade, lower blade, stacked blades: Two blades stacked on one shaft, as on EGO's Select Cut mowers. EGO's AB2200D set holds an upper and a high-performance lower blade, and EGO says the AB2102D lower blade is interchangeable with its Mulching and Extended Run Time blades. Read more: EGO mower blade sets

E

ETL Listed · also ETL Listed Mark: Intertek's ETL Listed Mark, which Intertek says shows a product was tested by Intertek for compliance with North American safety standards. A mark in a listing photo is not proof for a given model; check the certification record. Read more: Mower safety standards and part recalls: CPSC, ANSI, UL and marks, Buying mower blades and parts on Amazon and AliExpress: what to check

F

Fabricated deck: A deck built up from welded steel pieces rather than pressed from one sheet. On Cub Cadet's 50/54-inch double bagger, 54-inch fabricated decks take the discharge chute directly. Read more: Riding mower bagger fit
Free Return label · also free returns: A store label offering free return shipping. AliExpress's Free Return terms, effective November 1, 2022, applied only to products carrying a Free Return label; check the current terms on the listing. Read more: Ordering mower parts from abroad: US duties, Canada taxes and returns, Buying mower blades and parts on Amazon and AliExpress: what to check
Full-bag indicator: A flag or window on a bagger that shows when the bag is full. Husqvarna's 960 73 00-04 and EGO's ABK4200 both list one. Read more: Riding mower bagger fit
Fusion edge · also Fusion: Oregon's name for the cutting edge on its Gator G5, which Oregon describes as an ultra-hard tungsten carbide layer. Oregon also says its G6 uses Fusion technology. These are Oregon's descriptions. Read more: Oregon Gator G3, G5 and G6 blades, Mower blade claims vs evidence

G

Garden tractor: A heavier riding tractor built to take ground-engaging attachments. Husqvarna lists its sleeve hitch for garden tractors with 22 and 23-inch tires, and Troy-Bilt lists one for Cub Cadet XT2 Enduro garden tractors from 2015 on. Read more: Sleeve hitch vs tow hitch, Lawn-tractor hitches and hitch pins: what mounts to your tractor
Gator blade · also Gator G3, Gator G5, Gator G6: Oregon's name for its Gator mulching blades (G3, G5 and G6). Oregon says their teeth circulate cut grass back into the deck multiple times; that is Oregon's description, not a measured result. Read more: Oregon Gator G3, G5 and G6 blades, Mower blade claims vs evidence
Gator-style blade · also toothed mulching blade: A blade from any maker with teeth or notches along the lift that looks like Oregon's Gator. A similar look is not fit: match the length, hole and part number. Read more: Oregon Gator G3, G5 and G6 blades, OEM vs aftermarket mower blades
Grass bag · also grass catcher: The fabric or mesh bag that collects clippings on a mower. Some are sold without their frame, so check what the part includes. Read more: Replacement grass bag or bag and frame?, Grass bags and bagger kits: bag only, bag and frame, or full kit
Grasscycling · also leaving clippings: Leaving clippings on the lawn after mowing. University of Georgia Extension says you do not need a special mower to grasscycle and advises keeping the mower blade sharp. Read more: Mulch plug vs mulching kit, Mower blade claims vs evidence

H

Hair cotter pin · also hairpin clip, R-clip: A spring clip through the end of a hitch pin that keeps it from working out. Agri-Fab's 45-03022 sleeve hitch secures its hitch pin with a 5/32 in hair cotter pin. Read more: Towing with a lawn tractor or zero-turn, Sleeve hitch vs tow hitch
High-lift blade · also bagging blade: A blade with a taller lift that moves more air, sold for bagging. EGO lists its AB2102D as a high-lift bagging set, and Toro labels its 79016P TimeCutter blades high-lift. Read more: Standard vs high-lift vs mulching blades, EGO mower blade sets
Hitch pin: The pin that couples a towed implement to a hitch. Agri-Fab's 45-0326 lawn sweeper connects with a hitch pin, two 3/4 in spacers and a 1/8 in hair cotter pin. Read more: Towing with a lawn tractor or zero-turn, Lawn-tractor hitches and hitch pins: what mounts to your tractor
Hitch point: The place a maker allows towed equipment to attach. Toro's TimeCutter SW manual says not to attach towed equipment except at the hitch point. Read more: Towing with a lawn tractor or zero-turn

I

Independent measurement: A measurement made by someone other than the seller, such as a university study. A 2003 JSME study measured airflow under one three-spindle mower deck with laser Doppler velocimetry; it ranks no replacement blade. Read more: Mower blade claims vs evidence
Integrated pulley · also adapter with pulley: A blade adapter with a pulley built in. Troy-Bilt lists its 687-02539 as a blade adapter with pulley, 2.85 in x 7/8 in inside diameter. Read more: Mower blade adapters: bore, height and pulley

L

Lawn tractor · also riding mower: A riding mower with the engine in front and the deck under the middle. Some hitches are not for them: Troy-Bilt's 19B30019OEM sleeve hitch is not compatible with lawn tractors. Read more: Sleeve hitch vs tow hitch, Lawn-tractor hitches and hitch pins: what mounts to your tractor
Low-lift blade: A blade with little lift. Oregon lists its 25 in 91-544 as a low-lift blade, used two per 48-inch cut and three per 72-inch cut. Read more: Standard vs high-lift vs mulching blades, Blades per deck and blade length

M

Maker claim · also manufacturer claim: A statement a maker makes about its own product with no published test behind it. This site attributes such claims to the maker and never presents them as measured results. Read more: Mower blade claims vs evidence, Oregon Gator G3, G5 and G6 blades
Model number · also kit number: The number a maker gives a mower model, printed on its label, such as Toro 21465. A kit can carry its own number: RYOBI writes one pair as RY401140/RY401014. Read more: Find your mower's model and serial number, Mower model parts finder
Mulch plug · also mulch cover: A cover that closes the discharge opening so clippings stay under the deck. Cub Cadet's 19A30055100 kit for 42-inch decks is one molded plug with mounting hardware. Read more: Mulch plug vs mulching kit, Mulching kits and mulch plugs: deck, models and what is in the box
MulchControl: John Deere's name for its mulching system, used here only to describe fit: a baffle opened and closed by a lever on top of the deck. Deere says it still mulches about one third of the material in side-discharge mode; that is Deere's claim. Read more: John Deere MulchControl kits
Mulching blade · also 3-in-1 blade: A blade shaped to cut clippings again before they drop. Cub Cadet says mulching kits generally consist of mulching blades and a plug, and that its 3-in-1 mulching blades discharge less efficiently than its 2-in-1 high-lift blades. Read more: Standard vs high-lift vs mulching blades, Mulch plug vs mulching kit
Mulching kit: The parts that set a deck up for mulching. Cub Cadet says kits generally consist of mulching blades and a mulching plug, but contents differ by kit, so read each kit's list. Read more: Mulch plug vs mulching kit, Mulching kits and mulch plugs: deck, models and what is in the box

N

Nominal deck width · also deck size, nominal size: The deck size a maker uses in its name, such as 42-inch. It is a filter, not proof of fit: Oregon lists three 17-1/16 in blades for one 48-inch cut and two 25 in blades for another. Read more: Blades per deck and blade length, Deck size blade finder

O

OEM (original equipment manufacturer) · also original equipment: The company that built the mower, or the part it shipped with. An OEM part is the one the mower's maker sells under its own part number. Read more: OEM vs aftermarket mower blades, Find a mower blade by part number
OEM part number · also original part number: The mower maker's own number for a part, such as Cub Cadet 734-04155. Oregon's part finder lets owners search by the OEM part number of the part they are replacing. Read more: Find a mower blade by part number, Mower model parts finder

P

Property class · also bolt grade: A bolt's strength grade, such as 8.8 for metric bolts. Cub Cadet's parts list names bolts with it, for example Bolt M6-1 x 20 Gr8.8 (710-04918). Read more: Mower blade bolts

R

Rectangular center hole · also rounded-rectangle hole: A center hole shaped like a rectangle, sometimes with rounded corners, measured by its inner length and height. Oregon uses it to fit the bow-tie pattern on MTD-built walk-behind blade adapters. Read more: Mower blade center-hole shapes, Mower blade adapters: bore, height and pulley
Recycler blade: Toro's name for the blade on its Recycler mowers, used here only to describe fit. Toro describes its 22-inch 59534P as a Recycler straight edge, standard discharge blade with wing-like accelerators. Read more: Toro 22-inch Recycler grass bag and frame, When to replace a lawn mower blade

S

S-shape center hole · also S-shaped hole: A center hole shaped like the letter S. Craftsman says the S-shaped hole on its CMXGZAM110191 set ensures proper installation, so the blades cannot go on upside down. Read more: Mower blade center-hole shapes, 42-inch riding mower blade sets
Seller of record · also Sold by: The business that actually sells an order, shown on Amazon as "Sold by", which can differ from the brand on the listing. Check "Ships from" and "Sold by" before you buy. Read more: Buying mower blades and parts on Amazon and AliExpress: what to check
Serial number: The unique number of one machine. Makers use it to tell production runs apart, so the parts for one model number can change with the serial number. Read more: Find your mower's model and serial number
Serial range · also serial interval: A span of serial numbers that shares one parts record. Toro's 21465 has eight intervals between 400000000 and 999999999, and its 77508 TimeCutter has two: 400000000-421999999 and 422000000-999999999. Read more: Find your mower's model and serial number, Toro TimeCutter blades and serial ranges, Toro 22-inch Recycler grass bag and frame
Side discharge: A mowing mode in which clippings leave the deck through an opening and chute on its side. Read more: Standard vs high-lift vs mulching blades, Mulch plug vs mulching kit
Side holes · also outer holes: Outer holes some blades carry on each side of the center hole. Their spacing is measured center to center, and Oregon's catalog records the outer hole and that spacing for each blade. Read more: How to measure a lawn mower blade
Sleeve hitch: A rear hitch on a garden tractor that takes ground-engaging tools. Husqvarna says its sleeve hitch accepts attachments like a plow, cultivator or box scraper. Read more: Sleeve hitch vs tow hitch, Lawn-tractor hitches and hitch pins: what mounts to your tractor
Spindle · also spindle shaft: The shaft on a deck that carries and spins a blade. In 2018 SureFit recalled two aftermarket spindle shafts sold for John Deere riding mowers because the shaft could break and eject pieces. Read more: Mower blade adapters: bore, height and pulley, Mower safety standards and part recalls: CPSC, ANSI, UL and marks
Stamped deck: A deck pressed from sheet steel. Husqvarna classifies baggers and mulch kits by deck style (Stamped, Fabricated, Clear Cut, LRV), and Cub Cadet's 50/54-inch double bagger needs a chute adapter on stamped decks. Read more: Riding mower bagger fit
Standard blade · also side-discharge blade, 2-in-1 blade: A blade with a modest lift made mainly for side discharge. Makers use the label differently, so the part number decides fit, not the word standard. Read more: Standard vs high-lift vs mulching blades
Star center hole · also 5-point star, 6-point star, 7-point star: A center hole shaped like a star, named by its number of points rather than measured. Oregon's catalog records 5 pt. star and 7 pt. star holes, and a Y-shaped hole for 6-point star spindles. Read more: Mower blade center-hole shapes, Blade center-hole identifier
Supersession · also superseded part, replaces part: When a maker replaces an old part number with a new one. Cub Cadet's 19A30055100 replaces 19A30046100, and its 19B30031100 replaces 19A30003100 and 19A30031100. A newer number does not prove the old kit had the same contents. Read more: Find a mower blade by part number, Cub Cadet 42 and 46-inch baggers

T

Thread size · also thread pitch, TPI: A bolt's diameter and thread pitch, written in metric (M6-1) or inch form (3/8-24, meaning 24 threads per inch). Cub Cadet lists hex screw 710-1044 as 3/8-24 x 1.5. Read more: Mower blade bolts
Torque · also tightening torque: How tightly a bolt is turned, given in units such as foot-pounds. Blade and roller bolts have maker-set values; this site points to the maker's manual for the value. Read more: Mower blade bolts, Anti-scalp rollers on mower decks
Tow hitch · also hitch plate: A plate or bracket with a pin hole at the back of a mower for pulling a cart or sweeper. Toro's TimeCutter SW manual says not to use the machine for towing unless a hitch is installed. Read more: Sleeve hitch vs tow hitch, Towing with a lawn tractor or zero-turn
Towed weight · also ballast: The weight of what a mower pulls. For the TimeCutter SW 4200, SW 5000 and SWX 5000 only, Toro says towed weight must not exceed the weight of the machine, operator and ballast. Read more: Towing with a lawn tractor or zero-turn

U

UL component recognition · also Recognized Component Mark: UL's program for parts meant to be built into a larger certified product. UL says it is not a certification for a complete, standalone product. Read more: Mower safety standards and part recalls: CPSC, ANSI, UL and marks

W

Washer: A flat or shaped ring under a nut or bolt head that spreads the load. Use the washer stack your mower's parts list shows. Read more: Mower blade bolts
Wheel bore · also bearing ID, hub length: The hole through a wheel's hub or bearing that fits the axle. Makers list it apart from diameter and hub length; Oregon gives its 72-025 deck wheel a 2-7/16 in hub length. Measure your axle before ordering. Read more: Mower deck wheels: diameter, bore and hub

Y

Y-shaped center hole · also Y, 6 pt. star: Oregon's hole shape for replacing MTD-built blades with a 6-point star: Oregon says it fits the 6-point star on the spindle. Oregon lists it with a size, such as 5/8 or 11/16. Read more: Mower blade center-hole shapes, OEM vs aftermarket mower blades

Z

Zero-turn mower · also ZTR, zero-turn: A riding mower steered by driving its two rear wheels at different speeds, so it can turn in place. Read more: Bagger weights and missing parts on zero-turn mowers, Riding and zero-turn blade sets: deck first, then hole and count