Michigan Machine Shop and Tool & Die Insurance: What an Established Shop Actually Needs

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Michigan machine shop insurance is one of the few commercial programs where the standard small-business package genuinely does not fit. A shop that runs CNC equipment, holds customer material, and ships parts into an automotive supply chain has four exposures a Business Owner's Policy was never built to handle. If you own a machine shop, a tool and die house, or a metal fabricating operation in Michigan, this is what a properly built program looks like and where the common gaps are.

Why a BOP does not fit a machine shop

A Business Owner's Policy bundles general liability and commercial property for small, low-hazard operations. Many carriers' BOP eligibility rules exclude manufacturing outright, and those that will admit light processing cap it at a size most established shops passed years ago. That is not a slight against your shop; it reflects that a BOP has no good way to price heavy equipment, products liability into a supply chain, or the stock of customer-owned material sitting on your floor.

The right structure for an established shop is a commercial package policy or a manufacturers' program built line by line: property, general liability with a real products-completed operations limit, equipment breakdown, business income with dependent property coverage, inland marine for property in transit and at outside processors, commercial auto, workers' compensation, and an umbrella that sits over all of it. Learn more about how these pieces fit on our Michigan manufacturing insurance page.

Your CGL will not pay to recall your parts

This is the single most misunderstood coverage question in manufacturing, and it costs shops real money. The standard ISO commercial general liability form (CG 00 01) contains a group of business-risk exclusions that sit right next to each other:

• Exclusion k, Damage To Your Product. Property damage to your own product arising out of it. If the part you machined is the thing that failed, the CGL does not buy you a new part.
• Exclusion l, Damage To Your Work. The parallel exclusion for work you performed, within the products-completed operations hazard.
• Exclusion m, Damage To Impaired Property. Property that is not physically injured but is less useful because your part is in it, or because you did not deliver on time.
• Exclusion n, Recall Of Products, Work Or Impaired Property. Loss, cost or expense for the withdrawal, recall, inspection, repair, replacement, adjustment, removal or disposal of a product because of a known or suspected defect.

Read those together and the picture is clear. If a bad lot of your parts causes an injury or damages someone else's property, that is what the CGL is for. If a bad lot of your parts has to be pulled, sorted and replaced before it hurts anyone, that is exclusion n, and the CGL pays nothing. In an automotive supply chain, the second scenario is far more common than the first, and the sorting and containment invoice from a Tier 1 customer arrives fast.

The fix is a separate product recall or product contamination policy, and for suppliers specifically, a recall expense endorsement that responds to a customer's third-party recall costs. These are not automatic. They are bought on purpose, and many shops carrying $2 million of general liability have zero recall limit.

Watch your products-completed operations aggregate

The CGL carries a Products-Completed Operations Aggregate Limit that is separate from the General Aggregate. Claims arising from parts you have already shipped erode that separate bucket. For a shop shipping millions of pieces a year, the products aggregate is often the limit that matters, and it is worth checking that yours is not simply mirroring a generic small-business number.

Equipment breakdown: the machine failing is not a property loss

Commercial property policies cover fire, wind, water damage, theft under a special form, and similar external causes of loss. They generally exclude mechanical breakdown and electrical injury to the equipment itself. When a spindle seizes, a servo drive burns up, a control cabinet takes an electrical surge, or an air compressor lets go, the property policy is not the answer.

Equipment breakdown coverage (the modern successor to boiler and machinery) is. It responds to the physical damage to the equipment, and, when written properly, to the business income you lose while the machine is down and the extra expense of renting time at another shop to keep a customer supplied. For a shop where one machine represents a meaningful share of capacity, this is not an optional line item.

Business income: your worst shutdown may start somewhere else

Standard business income coverage responds when your property suffers a covered loss. That is the obvious scenario, and it is worth insuring; you can read more in our guide to Michigan business interruption insurance. But in a supply chain, the shutdown that hurts most often begins at somebody else's address:

• Your customer's plant burns or floods and stops taking your parts. Your machines are fine. Your revenue is not.
• Your single-source supplier of a specific bar stock, casting or heat-treat service goes down and you cannot run.
• An outside processor holding your work in process has a loss while your parts are in their building.

The coverage for the first two is Business Income From Dependent Properties, written on ISO form CP 15 08 (broad form) or CP 15 09 (limited form). It works by scheduling the specific locations you depend on, which means it only helps if the right locations are actually listed. The third scenario is an inland marine question: property of yours in the care of others, and property of others in your care, both need to be addressed deliberately.

Workers' compensation: Michigan uses its own class codes

Comp is usually the largest single premium line on a shop's program, and it is calculated as (payroll divided by 100) times the class code rate times your experience modification factor. The class code is the lever.

Here is where most online guidance misleads Michigan owners: Michigan is not an NCCI state, so the rate, the rules and the assignment notes behind your code are not the ones a national article is describing. The Compensation Advisory Organization of Michigan (CAOM) maintains Michigan's own classification manual. General machining usually lands on 3632, Machine Shop NOC. Tool and die work splits three ways in CAOM's manual depending on how the work is done: 3095 where tool making runs on programmable machining centers, 3116 for hands-on die, jig, fixture and metal mold making, and 3096 where the shop also produces tool details or incidental machinery. The dividing lines are automation and scope of product, not shop size. CAOM's manual also notes that where tolerances held on more than half the work are .001 inch or tighter, 3629, Precision Machine Parts Mfg NOC, may be used in place of 3632 — a live reclassification worth asking about if you run tight-tolerance work. Separate lower-rated codes exist for genuinely clerical staff, outside sales and drivers. The code numbers often look familiar to anyone who has worked in another state, but the rates, rules and assignment notes are Michigan's own, so verify against CAOM's manual rather than a national list, and read our deeper explanation of how Michigan workers' comp class codes work.

Two things move comp dollars more than shopping the market ever will: getting the classification right, and managing the experience modification factor, which is driven far more by claim frequency than by claim size. A shop with five $4,000 lacerations is usually penalized harder than a shop with one $20,000 claim. See our guide to the Michigan experience mod for how that math works.

The EMPP tax exemption trap

Michigan's Eligible Manufacturing Personal Property exemption (MCL 211.9m and 211.9n) removes qualifying industrial processing equipment from local personal property tax, replacing it with the state Essential Services Assessment. It is a genuinely valuable exemption and most Michigan shops use it.

It is also the source of a quiet insurance problem. A tax exemption changes what you report to a local assessor. It changes nothing about what it costs to replace a machining center on a 2026 lead time. When a shop's insurance schedule of values has been quietly tracking a tax-driven number instead of replacement cost, the shortfall does not surface until there is a fire and a coinsurance calculation. Insure equipment at what it costs to replace, and revisit that number annually.

Michigan context

This is not a niche exposure in southeast Michigan. Macomb County alone reported 691 automotive and mobility establishments and 57,651 jobs in 2024, contributing $12.1 billion in GDP, with a location quotient of 5.60 against the national average (Macomb County, By The Numbers 2025). Oakland County adds a dense base of engineering, tooling and Tier 2 and Tier 3 suppliers. If you run a shop here, your customers, your competitors and your risk profile are all shaped by that concentration.

Frequently Asked Questions

Does general liability cover a product recall?

No. The standard commercial general liability form specifically excludes the cost of withdrawing, recalling, inspecting, repairing, replacing or disposing of a product because of a known or suspected defect. Recall costs, including sorting and containment charges billed by a customer, require a separate product recall policy or a recall expense endorsement.

Does commercial property insurance cover a CNC machine that breaks down?

Generally no. Commercial property forms exclude mechanical breakdown and electrical injury to the equipment itself. Equipment breakdown coverage, formerly called boiler and machinery, is what responds to the damage and, when written with time element, to the income lost while the machine is down.

What workers' comp class code does a Michigan machine shop use?

Michigan maintains its own classification manual through the Compensation Advisory Organization of Michigan rather than using the national NCCI system. General machining commonly falls under code 3632, Machine Shop NOC, with code 3629 available for precision work where tolerances on most jobs are .001 inch or tighter. Tool and die operations split between 3095 for highly automated tool making, 3116 for hands-on die, jig and fixture work, and 3096 where tool details or incidental machinery are also produced. Because the assignment depends on what your shop actually does, verify your specific code against CAOM's manual with your agent.

What is dependent property coverage and do I need it?

Dependent property coverage, written on ISO forms CP 15 08 or CP 15 09, pays business income losses when a location you depend on suffers a covered loss, such as your largest customer's plant or a single-source supplier. It only responds for locations you schedule on the policy, so the list has to be accurate and current. If losing one customer or one supplier for sixty days would materially hurt you, it is worth pricing.

Is a BOP enough for a small machine shop?

Rarely. Most carriers exclude manufacturing from Business Owner's Policy eligibility, and a BOP has no mechanism for products liability into a supply chain, equipment breakdown, or dependent property income. A commercial package policy built for manufacturing is the normal structure.

The bottom line

A machine shop program fails in specific, predictable places: no recall limit, no equipment breakdown, business income that stops at your own property line, a stale schedule of values, and a workers' comp classification nobody has re-examined in years. None of those show up on a premium comparison. All of them show up in a claim.

We work best with established Michigan shops — payroll on the books, machines on the floor, a building you own or a long-term lease, and a few years of loss runs to look at. If that is you, send us your current declarations pages, your schedule of values and your last two loss runs, and we will tell you plainly where the gaps are before we talk about price. As an independent agency representing more than twenty commercial carriers, we can place a shop with a manufacturing market rather than forcing it into a package that was not built for you. Call (248) 693-6455 or request a commercial review.