Unraveling the Timeline: The SinkMaster 1/2 HP Bonecrusher 750 Garbage Disposal
The SinkMaster brand holds a distinct place in American kitchen history, synonymous with early garbage disposal innovation and widespread adoption. Among its most recognized models was the SinkMaster 1/2 HP Bonecrusher 750. Pinpointing its exact year of introduction or discontinuation proves challenging due to limited archival records from manufacturers decades later, but we can confidently place its primary production era within the late 1970s through the mid-to-late 1980s.
Here’s a breakdown of the evidence and context:
1. The Anaheim Manufacturing Company (AMC) Era: SinkMaster was primarily manufactured by AMC, a major player in disposals and plumbing fixtures.
Pre-Bonecrusher Branding: AMC produced disposals under the SinkMaster name long before introducing the specific “Bonecrusher” sub-brand.
The Rise of Bonecrusher: The Bonecrusher line emerged as AMC’s premium offering, emphasizing durability and grinding power (“Bonecrusher” being a key marketing term). This branding push gained significant traction in the late 1970s.
Model Number Significance: The designation “750” strongly suggests it belonged to a series introduced later than earlier Bonecrushers like the simpler “Model A”. Model numbers often increased sequentially over time.
2. Horsepower Context:
Standard Power: A 1/2 horsepower motor represented standard residential power during this period (roughly late ’60s through ’80s). It was sufficient for typical household food waste but less common for heavy bones compared to larger units also bearing the Bonecrusher name.
Evolution: While smaller units existed earlier, the combination of the established Bonecrusher brand with this standard power level points towards mainstream market penetration occurring after the initial launch of higher-horsepower Bonecrushers.
3. Kenmore Connection & Market Presence:
AMC supplied garbage disposals branded as Kenmore for Sears throughout much of this period.
Documentation shows Kenmore models equivalent to various SinkMaster Bonecrushers (including likely equivalents to the ‘750’ series) were widely sold by Sears during the 1980s. Sears catalogs from this decade frequently feature these units
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