How do you calculate inspection cost for a sintered part lot?

Multiply parts inspected by the per-part inspection cost, scale by your sampling coverage, then add the fixed metrology setup. For 100 parts at $45 each with 80% coverage plus a $250 setup, total inspection cost is $3,850, or $38.50 per piece.

What does the sampling coverage factor represent?

It is the fraction of the lot you actually gauge. 100% means every part is checked; 80% might reflect a reduced AQL sampling plan or checking most but skip-lotting some features. Lower coverage cuts cost but increases escape risk.

Why is PM part inspection more expensive than for machined parts?

Sintered parts need density, apparent-hardness, and sometimes crack or porosity checks on top of dimensions, because green defects and sinter distortion don't show up with a caliper. Those tests add gauge time and skilled labor per part.

When should I move from 100% inspection to sampling?

Once a process is capable (high Cpk) and the part is not safety-critical, statistical sampling cuts inspection cost sharply. On a 100-part lot, dropping from full to 80% coverage trims the variable inspection spend proportionally while the $250 setup stays fixed.

How does fixed metrology cost affect small lots?

The $250 setup is spread across the lot, so on 100 parts it adds $2.50 per piece, but on a 10-part prototype lot it adds $25 per piece. Fixed metrology dominates inspection cost on short runs.

What is a good inspection cost per part?

There is no universal figure, but inspection running well under 10% of total part cost is typical for stable high-volume PM. When it approaches pressing cost, revisit coverage, fixturing, or automated gauging.

Powder Metallurgy & Sintered Parts calculator

Inspection Cost Calculator

Inspection Cost captures what it costs a powder metallurgy shop to verify a lot meets dimensional, density, and hardness specs before it ships. PM parts are net-shape but prone to density gradients, sizing spring-back, and sinter distortion, so inspection often means CMM checks, density flotation tests, apparent-hardness readings, and crack detection rather than a quick caliper pass. Quality engineers and estimators use this figure to price the inspection line item in a quote, to justify moving from 100% inspection to statistical sampling, and to see how fixed metrology setup weighs on small lots. On low-volume or safety-critical parts, inspection can rival the pressing cost itself.

What this calculator does

Inspection Cost captures what it costs a powder metallurgy shop to verify a lot meets dimensional, density, and hardness specs before it ships.
Use it when inspection cost in powder metallurgy and sintered parts is being put through a powder metallurgy and sintered parts weighted-cost review.
It computes total lot inspection cost from a per-part gauging cost scaled by sampling coverage, plus a fixed metrology and setup charge.

Formula used

Inspection Cost cost = quantity × rate × capture factor + fixed cost
Per-unit inspection cost = total cost ÷ quantity

Inputs explained

Parts inspected per lot:
Inspection labor & gauge cost per part:
Sampling / inspection coverage:
Fixed metrology & setup cost:

How to use the result

Use it when quoting an inspection line item, comparing 100% inspection to sampling, or evaluating the payback on a fixture or automated gauge.
It models inspection as a flat per-part cost and does not price the cost of escapes; a lower sampling rate cuts cost but raises the risk of shipping an out-of-spec lot.

Current U.S. benchmarks

The producer price index for steel mill products stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. Quotes priced off last quarter's material cost miss this move.
U.S. iron and steel imports ran $2.1B in May 2026 (Census International Trade). The U.S. ran a trade deficit of $0.4B in the category that month. Import volumes are the pressure gauge behind tariff and reshoring decisions.

Common questions

How do you calculate inspection cost for a sintered part lot? Multiply parts inspected by the per-part inspection cost, scale by your sampling coverage, then add the fixed metrology setup. For 100 parts at $45 each with 80% coverage plus a $250 setup, total inspection cost is $3,850, or $38.50 per piece.
What does the sampling coverage factor represent? It is the fraction of the lot you actually gauge. 100% means every part is checked; 80% might reflect a reduced AQL sampling plan or checking most but skip-lotting some features. Lower coverage cuts cost but increases escape risk.
Why is PM part inspection more expensive than for machined parts? Sintered parts need density, apparent-hardness, and sometimes crack or porosity checks on top of dimensions, because green defects and sinter distortion don't show up with a caliper. Those tests add gauge time and skilled labor per part.
When should I move from 100% inspection to sampling? Once a process is capable (high Cpk) and the part is not safety-critical, statistical sampling cuts inspection cost sharply. On a 100-part lot, dropping from full to 80% coverage trims the variable inspection spend proportionally while the $250 setup stays fixed.
How does fixed metrology cost affect small lots? The $250 setup is spread across the lot, so on 100 parts it adds $2.50 per piece, but on a 10-part prototype lot it adds $25 per piece. Fixed metrology dominates inspection cost on short runs.

Last reviewed 2026-05-12.