Asphalt-cutter blade widths stocked for demolition hammers fall into three practical bands, 3 in, 4 to 5 in, and 5 to 5-1/2 in, with the 5 in figure dominating the 1-1/8 in hex, 1-1/4 in hex, and SDS-Max product lines carried by McMaster-Carr, Champion, and Milwaukee [S2][S4][S5].
The blade width is set by the shank/toolholder family and by the host machine class (electric demolition hammer, air pavement breaker, or rotary/breaker combination), so width cannot be selected in isolation from shank and hammer size [S2][S4].
Shank-to-Width Mapping in Current OEM Catalogs
For electric demolition hammers fitted with a 3/4 in hex shank at 1-1/8 in shank length, McMaster-Carr stocks 1 in, 3 in, 5 in, and 4-1/2 in blade widths across 12 in and 15-1/2 in overall lengths [S2]. The 5 in blade is the widest option in this electric-hammer group and is the same width Milwaukee specifies for its 5 in x 16-1/2 in SDS-Max asphalt cutter, part 48-62-4066 [S5].
For air-powered pavement breakers using 1 in hex x 4-1/4 in shanks, the stocked widths narrow to 1-1/4 in, 3 in, 1/4 in, 5 in, and 5-1/2 in, with overall lengths running 15-1/4 in to 22-1/4 in [S2]. For heavier 1-1/4 in hex x 6 in pavement-breaker shanks, McMaster-Carr lists 1-3/8 in, 3 in, 3/8 in, 5 in, and 5-1/2 in blades at 17 in to 24 in overall length, with the 3/8 in entry being a narrow spade rather than a wide cutter [S2]. Champion Chisel's SDS-Max line follows the same convention, marketing a 5 in asphalt-cutter body explicitly for clean cuts during patching, trenching, and road repair [S4].
How Width Tracks Hammer Class and Application
A 3 in wide spade/chisel blade is the typical all-rounder for asphalt scoring, trench starting, and small patch work, and is held in common stock across 3/4 in hex, 1 in hex, and 1-1/4 in hex shank families [S2]. Mid-range 4 in to 4-1/2 in widths are sold specifically as clay-spade bodies for digging compacted material, with 4-1/3 in width and 16 in length documented on California Tools and Equipment's 1-1/8 in hex clay-spade asphalt-cutter bit [S3].
5 in and 5-1/2 in blades are the wide-format end of the catalog, marketed for cutting a wide swath through asphalt and compacted surfaces, and are stocked as 1 in hex, 1-1/4 in hex, and SDS-Max SKUs from McMaster-Carr, Milwaukee, and Champion [S2][S4][S5]. The 5 in x 17-1/2 in 1-1/8 in hex Makita 751620-A and the 5 in x 20-1/2 in 1-1/8 in hex-with-notch Milwaukee 48-62-4020 are the two widest commonly-stocked SKUs for handheld electric demolition breakers, and both are explicitly labelled as not for use on concrete [S5][S9].
Selection Criteria: Shank Match, Length, and Body Geometry
Shank size is the binding constraint: 3/4 in hex, 1 in hex, 1-1/8 in hex, 1-1/4 in hex, and SDS-Max are the five live shank families in the current catalogs, and each gates which widths are physically available [S2][S4]. Milwaukee's accessory matrix maps part numbers across SDS+, SDS-Max, Spline/Round Hex, 3/4 in hex, and 1-1/8 in hex-with-notch, with asphalt-cutter SKUs published only in the SDS-Max and 1-1/8 in hex columns [S5].
Overall length tracks the hammer class: 12 in to 15-1/2 in for 3/4 in and 1 in hex shanks, 15-1/4 in to 22-1/4 in for 1 in hex pavement-breaker shanks, and 17 in to 20-1/2 in for 1-1/8 in hex and SDS-Max electric breakers [S2][S5]. Body geometry is a second constraint: square clay-spade bodies (4-1/3 in x 16 in, 1-1/8 in hex) are sold for digging, whereas 5 in wide flat asphalt-cutter bodies are sold for slicing and prying the mat open [S3][S5].
Comparison: 3 in vs 5 in vs 5-1/2 in Blade Widths
On shank availability, 3 in widths are stocked across 3/4 in hex, 1 in hex, 1-1/8 in hex, and 1-1/4 in hex, while 5 in widths add SDS-Max and the 5-1/2 in width is restricted to 1 in hex and 1-1/4 in hex pavement-breaker shanks [S2][S5]. On overall length, 3 in spades run 12 in to 24 in depending on shank, 5 in cutters cluster at 15-1/2 in to 20-1/2 in, and 5-1/2 in cutters are the longest at 20-1/4 in to 22 in [S2][S5].
On price, McMaster-Carr's 1 in hex 3 in wide spade (3613A3) lists at $57.09, the 5 in wide 1-1/4 in hex spade (3617A3) at $110.42, and the 5-1/2 in wide 1-1/4 in hex spade (3616A6) at $144.71, a near-2.5x spread between the 3 in and 5-1/2 in SKUs in the same shank family [S2]. On application labelling, 3 in bodies are described as for general chipping and breaking, 5 in bodies as for cutting asphalt or hard ground (do not use for concrete), and 5-1/2 in bodies as clay spades for digging compacted material [S2][S5].
Who the 5 in Width Is For, and Who Should Pick Smaller
The 5 in x 17-1/2 in to 20-1/2 in 1-1/8 in hex and SDS-Max asphalt cutter is the right pick for utility patching, trench opening in continuous asphalt, and road-repair work where a single pass needs to prise the mat open for a backhoe or demolition hammer bite [S4][S5][S9]. The 3 in spade width is the correct pick for scoring lines, starting trenches in confined edges, and operators using lighter 3/4 in hex or 1 in hex electric breakers where a 5 in blade would overload the tool [S2].
For air-powered pavement breakers in the 1 in hex and 1-1/4 in hex class, the 5 in and 5-1/2 in wide bodies are the standard production choice and pair with 17 in to 24 in overall lengths for full-depth mat work [S2]. The 4 in to 4-1/2 in clay-spade geometry is the right pick when the substrate is hard-packed gravel or clay rather than bound asphalt, and is sold as a separate SKU family from the flat asphalt cutter in both 1-1/8 in hex and SDS-Max lines [S3][S5].
Limits, Failure Modes, and Common Misuse
Milwaukee's catalog explicitly warns "DO NOT use for concrete" on its 5 in x 17-1/2 in and 5 in x 20-1/2 in asphalt-cutter SKUs (48-62-4066 and 48-62-4020), reflecting the real failure mode where a wide asphalt blade is driven into concrete and the body folds or chips at the shank shoulder [S5]. Champion Chisel positions its SDS-Max asphalt cutter for clean cuts during patching, trenching, and road repair only, not for slab demolition, and SDS-Max bodies are heavier-duty than the 3/4 in hex bodies used on small electric hammers [S4].
Air-hammer round-shank asphalt cutters at 0.890 in round x 1-7/8 in shank (McMaster-Carr 36205A41/A42/A43) are sold specifically for Chicago Pneumatic 11X/81X/4181 and Ingersoll-Rand 8001A/9001 hammers, so a 1 in or 1-1/8 in hex asphalt cutter will not physically fit these legacy air tools [S2]. For saw-based asphalt cutting, an entirely different tool class applies, walk-behind diamond-blade saws use 12 in to 24 in diameter diamond blades rather than demolition-hammer spade bits, and a 5 in hammer spade is not a substitute for a 14 in diamond blade on any continuous-cut job [S7].
Standards, Sourcing, and Catalog Traceability
No ASTM or ISO standard governs demolition-hammer asphalt-cutter blade geometry in the cited sources; the 1-1/8 in hex, 1-1/4 in hex, 1 in hex, and SDS-Max shank patterns are de facto OEM conventions published by Milwaukee, Champion, and Makita in their product catalogs [S2][S4][S5][S9]. GlobalSpec's demolition-hammer selection guide, captured 21 Sep 2026, frames shank and toolholder fit as the first selection criterion, ahead of bit style, which aligns with the width-vs-shank pattern visible across the McMaster-Carr, Champion, and Milwaukee lines [S1].
Buyers can trace a 5 in asphalt cutter to a specific live part number across three independent sources: McMaster-Carr 3617A3 (1-1/4 in hex, $110.42), Milwaukee 48-62-4020 (1-1/8 in hex-with-notch), and Makita 751620-A (1-1/8 in hex, $56.08 at retail on 21 Oct 2026) [S2][S5][S9]. The 3 in and 5-1/2 in widths are likewise traceable to McMaster-Carr SKUs 3613A3 and 3616A6 respectively, both at 20 in overall length on 1-1/4 in hex shanks [S2]. For deeper background on how a demolition hammer drive pairs with a chisel versus a rotary hammer drill bit, the encyclopedia entries cover the matching host-tool selection logic.
Trackable next signal: any new catalog addition of an SDS-Max asphalt cutter wider than the current 5 in OEM maximum, or a 1-1/8 in hex-with-notch SKU narrower than 3 in, would be a spec-level event worth flagging against the McMaster-Carr, Champion, and Milwaukee part-number sets listed above.