How a Fatigue Part Is Made

Primary process: Shot Peening. The full route, materials, tolerances and design tips for a fatigue part, with an indicative cost.

Shot PeeningPrimary process
SurfaceFamily
5Route steps

A fatigue part is primarily made by Shot Peening. Shot peening blasts the surface with small media to put it in compressive stress, which raises fatigue life. Below is the full route to make a fatigue part, the materials it suits, the tolerances to expect and the main design points. The route is free, from the finder.

Step by step

How a fatigue part is made

The usual route, raw material to finished part. The amber step is where the fatigue part gets its basic shape.

  1. Make the part

    Form and finish-machine the fatigue part to size first.
    Tooling None   Tolerance ±0.125mm, to ±0.025mm   Lead 1 to 10 days
  2. Clean and mask

    Clean the surface and mask the areas that must stay bare.
  3. Shot Peening

    Apply the shot peening to the fatigue part.
    Tooling Low   Tolerance minimal   Lead days
  4. Post-finish

    Seal, cure or re-grind any surface that changed dimension.
  5. Inspection

    Check coating thickness, hardness or adhesion.

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Materials

Materials for a fatigue part

GradeWhy it suits this
(fatigue-loaded steels/alloys)n/a
Design

Design tips

General pointers. The full design-for-manufacturing list for a fatigue part is in the dossier.

  • Thin sections distort. Peen both sides or mask.
  • Peening non-critical areas. Target fatigue zones only.
Cost

What a fatigue part should cost

Bombards the surface to induce compressive stress and raise fatigue life on cyclically-loaded parts (springs, gears, shafts).

PER-PART COST vs VOLUME
one-offat volumeVolume per order, low to highCost per part
Per-part cost drops as volume spreads tooling and setup over more parts. The exact figures for a fatigue part at your volume, in your currency, are in the dossier.
MODEL EST.
$4.2 to 12 per part at 1 off
A rough ballpark only. The dossier gives should-cost at your exact volume and currency, with the full breakdown.
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Everything you need to quote and source it

The free route above is yours. To actually put a number on a fatigue part and buy it well:

  • Should-cost at your exact volume in 12 currencies, with the material, processing, tooling and overhead breakdown
  • Who to source from, typical MOQ and lead time, and the exact RFQ checklist to send
  • A quote checker that tells you if a supplier quote is fair, and the red flags to watch
  • The full DFM list and a ready-to-send RFQ draft

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See also: How Shot Peening works and the full route for a fatigue part in the finder.

FAQ

Frequently asked questions

How is a fatigue part made?
A fatigue part is primarily made by shot peening. The route is: Make the part; Clean and mask; Shot Peening; Post-finish; Inspection.
What does a fatigue part cost?
It depends on size, tolerance and volume. As a rough ballpark it starts around $4.2 to 12 per part at 1 off and falls with quantity. The dossier gives should-cost at your exact volume and currency. A model estimate, not a quote.
What material is a fatigue part made from?
Common choices are (fatigue-loaded steels/alloys).
What is the main process for a fatigue part?
Shot Peening. Fatigue-critical parts like springs, gears, shafts and airframe components.
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