Views: 3 Author: Site Editor Publish Time: 2026-08-17 Origin: Site
Tooling is the difference between a part that costs a few dollars each and one that costs a few cents. Rapid tooling builds a working mold in days or weeks rather than months, so you can run bridge or low-volume production without a hardened steel investment. This page covers mold materials with real shot-life and lead-time data, the amortization math, and where a soft RIM tool wins instead.
Table of Contents
Rapid tooling is a mold built quickly - usually from aluminum or pre-hardened steel - to support bridge or production runs of a few hundred to a few hundred thousand parts. It is the step between a machined sample and a full production tool. The wider process context is in our injection molding and bridge tooling guide.
Material sets cost, speed and how many parts the tool will survive. The table summarizes what we see in practice; exact life depends on geometry, fill pressure and resin abrasion.
Mold material | Rough lead time | Typical shot life | Relative cost | Best use |
Aluminum (e.g. 7075) | 1-2 weeks | 10,000-50,000 | $ | Bridge runs, prototype molds |
Pre-hardened steel (718H/P20) | 2-4 weeks | 300,000-500,000 | $$ | Medium bridge / pre-prod |
Hardened steel (H13, hardened) | 3-5 weeks | 1,000,000+ | $$$ | Full production |
Pick aluminum unless volume or wear pushes you to steel. Most bridge programs sit comfortably under 50,000 shots, which aluminum handles.
Wear shows up first as flash and dimensional drift on thin features, then as surface degradation. Plan a re-cut or replacement before the wear band eats into your tolerance band. A simple rule we use: size the mold so you replace it with margin to spare, not after the first rejected part. Part material also matters - glass-filled resins abrade aluminum faster than unfilled ABS; the filler effect is in our materials guide.
An aluminum bridge mold runs about 1-2 weeks; pre-hardened steel adds another week or two; hardened production steel can reach 3-5 weeks. If the calendar is the constraint, our quick-turn prototyping guide explains how shops compress machining and freight - though tooling time is the real floor for molded parts.
Tooling is a fixed upfront; each extra part spreads it thinner. Worked example: a $2,000 aluminum mold. At 100 parts the tool adds $20/part; at 500 parts it adds $4/part; at 2,000 parts it adds $1/part. That is why per-part price falls steeply through the first few hundred units and then flattens. The full cost mechanics - levers beyond tooling - are in our cost and quoting guide.
For very large, lightweight enclosures, reaction injection molding uses a soft tool and liquid polyurethane, often cheaper to build than a metal mold at low volume. Our RIM services guide covers where that route beats injection tooling - generally above ~300 mm parts at low volume.
Send the frozen model, material, expected volume and target lifetime. Ask suppliers to separate tooling from per-part price - that split is the only honest way to compare two offers, and it is what our RFQ checklist enforces.
Q: How long does a rapid tool last?
A: An aluminum bridge mold typically delivers roughly 10,000-50,000 shots; pre-hardened steel 300,000-500,000; hardened steel 1,000,000+. Geometry and fill pressure move the real number.
Q: Aluminum or steel for my run?
A: Aluminum for most bridge runs - cheaper and faster. Move to steel when volume or wear demands longer life and tighter tolerance.
Q: How fast can a mold be ready?
A: About 1-2 weeks for aluminum, 2-4 for pre-hardened steel, before production parts start.
Q: Does tooling cost show up in the unit price?
A: Not directly - it is a fixed upfront. Each additional part amortizes it, so per-part price drops fast through the first few hundred units.
Q: When is RIM a better choice than a metal mold?
A: For large, lightweight enclosures at low volume, RIM's soft tool is often cheaper to build than an injection mold. See the RIM guide for thresholds.
CTA: Send your frozen design for a rapid-tooling quote with itemized tooling request a rapid tooling quote.
