QuotedPartCost guides · Updated 2026-10-30
How much does a custom bolt cost to machine?
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This 4140 custom bolt quotes at $45.02 each for 10, $16.56 each at 100, and $9.06 each at 1,000 pieces. Turning setup and thread work make small lots expensive; a rolled-thread or bought-in head would change the route and the price. Confirm thread class and head details from the drawing. Head dimensions, thread length and any plating or heat treatment should be separate quote lines.
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The 4140 steel custom bolt example part
The example part represents a short turned bolt from round stock with a drilled end and a relief feature. It does not assume a specific thread size, head form, drive or strength class. Those details can add turning passes, thread rolling, broaching or bought-in hardware.
How the quantity break works
A prototype pays for programming, chuck setup and proving the thread. At 100 pieces, setup is diluted; at 1,000, a rolling die or a dedicated collet may make sense. Our pricing engine table shows the current route so the shop can compare that investment against a measured repeat cycle.
What the material or process changes
Material and heat-treatment requirements matter. 4140 may need quench and temper, black oxide or magnetic-particle inspection, each with its own minimum and lead time. They are not hidden in this machining-only number.
How to turn this into a firm quote
Ask for thread standard, class, runout, hardness, coating and gauge plan. Quote the special fastener as a sequence of named operations so a customer can see which specification caused the price change.
Questions to settle before release
Confirm thread standard, class, head or drive form, runout, hardness, coating and gauge requirements before releasing a custom-fastener quote. Ask whether the customer accepts single-point threads or requires rolled threads. Include heat treat, plating, inspection and packaging as named operations. The 10/100/1,000 table explains setup economics; the fastener specification determines the final routing.
For this custom bolt cost estimate, for a firm release, have the programmer and machinist read the assumptions together. They can spot an inaccessible feature, an extra load, a tool change or an inspection step before the number reaches the buyer. Treat the computed table as a shared starting point: the shop’s measured method and the customer’s print decide which edits belong in the final route.
For the fastener, identify the thread gauge and coating before the shop commits to a rolling or single-point route. The final release should preserve the drawing revision, stock source and inspection decision with the computed table.
Pricing engine output for the stated Steel 4140 pre-hard CNC turning example part
- • Material: Steel 4140 pre-hard; the US catalog stores its small-lot price and machinability factor.
- • Process: CNC turning; setup, machine time, deburring and inspection are generated from the example-part geometry.
- • Markup: 30% default US catalog markup; quantities are 10, 100, 1000.
- • Fictional 2 in turned part from 1.5 in bar; one drilled end hole and one groove.
- • 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 |
|---|---|---|---|---|---|---|
| 10 | 123.3 | 4.4 | $34.63 | $45.02 | $450.20 | 9 |
| 100 | 123.3 | 4.4 | $12.74 | $16.56 | $1656.00 | 10 |
| 1000 | 123.3 | 4.4 | $6.97 | $9.06 | $9060.00 | 16 |
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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