Guides / Cost

What Drives the Cost of a Semiconductor Test Jig

September 21, 2026

A test jig looks simple. A plate, some holes, a few pockets. Then the quote arrives and it is three times what the plate of aluminum costs. Here is where that money goes and which parts of it you control.

What is inside the number

Programming and fixturing. Paid once per order, whatever the quantity. On a single jig plate it is often the largest line. This is why a quantity of one and a quantity of five are much closer in total price than buyers expect.

Material. Usually a cast or rolled aluminum plate, sometimes stainless, sometimes a filled plastic for test hardware. Plate that has to be stress relieved and skimmed before real machining costs more and takes longer.

Machine time. Driven by hole count, pocket depth and how many times the part has to be flipped, not by the outline size. A 300 mm plate with 40 precision holes is a bigger job than a 600 mm plate with 12.

Finishing. Hard anodize, black oxide, marking, inserts and dowel work. Usually bought outside, so it adds days as well as cost. See hard anodize or electropolish for what the finish does to your holes.

Inspection. A first article report costs hours. A full dimensional report on every piece costs those hours again, every piece.

The four things that move the price most

1. Flatness and parallelism. A plate held to 0.05 mm is a normal job. The same plate at 0.01 mm may need stress relief, a skim cut, a rest and a second skim. Tolerance the mounting face, not the whole plate.
2. Hole position. Position tolerance drives both the machine and the inspection. Reference the holes to the same datum scheme the assembly uses, and only tighten the ones that locate something.
3. Thread and insert count. Threaded holes are slower than plain holes, inserts slower still and both add a failure mode at inspection.
4. Inspection depth. Decide early: first article plus sampling, or a report on every piece. The gap between those two is often twenty percent of the price.

What buyers can change before they quote

• Standard plate thickness instead of a custom skim size
• Standard hardware, standard dowel and thread sizes, no exotic fasteners
• One datum scheme across the family of jigs, not one per drawing
• Grouping a family of plates into one order so setup spreads
• Ordering the spare now instead of next year

None of these touch the function of the jig. All of them change the number.

Repeat orders are a different negotiation

Jigs and change parts repeat. A shop that knows a plate returns every quarter will price it differently from a one off, because the program, the fixture and the first article are already paid for. Say the repeat schedule in the RFQ even if it is approximate, and keep the drawing frozen between rounds.

Price drift on repeats almost always traces back to a quiet revision: a hole moved, a finish changed, a note added. Every one of those restarts part of the setup.

Comparing quotes fairly

Normalise these before you compare: material and plate spec, tolerance on the mounting face, hole position tolerance, finish and masking, inspection scope, packing level and who pays for finishing rework. Quotes that look 30 percent apart are usually 5 percent apart once those seven lines match.

If you want quotes that are already comparable, send the RFQ with the plate spec and the inspection scope in it and we will match shops that quote this work regularly.

Frequently asked questions

More on cost

• Why a Qualified Part Changes Price Between Orders
• Reading a Machining Quote Line by Line
• Planning Spares and Consumable Hardware Without Overstocking
• Where the Weeks Go on a Machined Semiconductor Part

All guides and the sourcing glossary.