QuotedPartCost guides · Updated 2026-10-30
Is 316 more expensive to machine than 304?
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For the milled block, 316 costs $40.91 more per part than 304 at one, $15.16 more at 10, and $11.95 more at 100 pieces ($556.36 for 304 versus $597.27 for 316 at one). The premium follows 316’s higher stock price and slightly slower cutting, before any passivation or special inspection.
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The 304 stainless example part
The reference block has a pocket, four through holes and two tapped side holes. Stainless removal is the expensive part of this job; stock weight matters too because the starting plate is thicker than the finished block. A thin wall, deep cavity or tight flatness callout would add more time than the grade switch.
How the quantity break works
304 is common for general corrosion resistance. 316 adds molybdenum for harsher environments, but the print may also call for passivation or a particular surface finish. Those requirements belong in separate quote lines so the comparison remains about machining and material.
| Qty | Setup min (lot) | Cycle min (part) | Cost / part | Quoted / part | Lot price | Lead days |
|---|---|---|---|---|---|---|
| 1 | 191.0 | 26.7 | $459.44 | $597.27 | $597.27 | 11 |
| 10 | 191.0 | 26.7 | $111.45 | $144.89 | $1448.90 | 12 |
| 100 | 191.0 | 26.7 | $74.05 | $96.27 | $9627.00 | 17 |
What the material or process changes
Setup minutes stay constant between the tables. At a one-piece quantity, that fixed work hides much of the alloy premium. At 100 pieces, the cycle and material lines dominate, so the difference becomes easier for a buyer to understand and negotiate.
How to turn this into a firm quote
Record the condition, finish and inspection plan with the selected grade. If the part will be welded, ask whether the material and heat-affected area change the specification. A transparent comparison helps the shop and buyer discuss function before chasing a unit-price delta.
Questions to settle before release
Before substituting 304 and 316, confirm chloride exposure, weld procedure and passivation standard. Ask if the customer needs a material heat number and whether the finished part must be free of embedded iron. Those requirements can add cleaning and inspection even when the CNC route is unchanged. Put them in the quote as named operations so the alloy comparison remains fair and reviewable.
For this 304 vs 316 machining cost estimate, use the first production run as a check on this estimate. Capture actual setup minutes, cycle minutes, material weight and outside invoices, then update the shop rate or example part assumption that was wrong. That small feedback loop is more useful than rounding every quote upward. It also gives the next estimator a concrete explanation when the customer asks why a repeat job moved.
Pricing engine output for the stated Stainless 304 CNC milling example part
- • Material: Stainless 304; the US catalog stores its small-lot price and machinability factor.
- • Process: CNC milling; setup, machine time, deburring and inspection are generated from the example-part geometry.
- • Markup: 30% default US catalog markup; quantities are 1, 10, 100.
- • Fictional 4 × 3 × 1 in milled block; no finish or outside process.
- • No outside finish, tax, freight, or customer-specific rate is included.
- • These are computed examples, not supplier quotes or market averages.
| Qty | Setup min (lot) | Cycle min (part) | Cost / part | Quoted / part | Lot price | Lead days |
|---|---|---|---|---|---|---|
| 1 | 191.0 | 25.6 | $427.97 | $556.36 | $556.36 | 11 |
| 10 | 191.0 | 25.6 | $99.79 | $129.73 | $1297.30 | 12 |
| 100 | 191.0 | 25.6 | $64.86 | $84.32 | $8432.00 | 17 |
Sources and limits
Claims are dated where they can change. Product calculations are examples from the stated inputs, not a promise about a customer's quote. Competitor wording is attributed to the source shown.
- The figures are computed from the stated example part and US catalog assumptions.
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