How to Compare Plastic Tooling Specifications for Your Production

Choosing injection tooling means checking more than the quoted price. Compare the mold materials, runner design, dimensional tolerance, expected service life, schedule, and inspection plan to see whether the tooling fits your part and production forecast. Longterm lists S50C or P20 mold bases, 718H, 1.2738, or S136 cavity steel, cold- or hot-runner configurations, a stated tolerance of ±0.02 mm, and mold life ranging from 50,000 to 1,000,000 shots.

Specifications to Review Before Approval

Start by matching the proposed mold construction to your part requirements and manufacturing plan. Mold base and cavity steel are specified separately, so ask the supplier to identify the combination included in your quotation. Also confirm which runner system is planned and whether the stated tolerance applies to the dimensions critical to your assembly.

Production volume makes the quoted mold life especially important. The 50,000–1,000,000-shot range is not a guarantee that every design will reach the upper limit. Request an expected life for the specific tooling proposal and check that it aligns with your output forecast. The listed lead time is 25–40 days, and the minimum order quantity is one set; verify the actual schedule for your design.

Materials, Runners, and Quality Checks

Mold construction

Available mold base materials are S50C and P20. The listed cavity steel choices are 718H, 1.2738, and S136. Confirm the selected grades in writing and ask the supplier to explain how the proposed materials suit your application.

Runner design and dimensional control

Both cold-runner and hot-runner configurations are offered. Since the product information does not set out criteria for choosing between them, state your preference in the project brief and have the supplier confirm the design. The stated precision tolerance is ±0.02 mm. Agree on the dimensions to be checked, the inspection method, and how results will be recorded.

Trials and inspection

Listed quality checks include a mold trial, dimensional inspection, and a full inspection before shipment. Longterm also describes first-article inspection, full dimensional measurement, and mold-running tests as part of its service checks. Specify which checks, sample approvals, and inspection records are required for your order. The company reports ISO 9001:2015 certification covering precision mold design, manufacturing, and sales, along with sales of plastic products.

Quick Specification Comparison

Relevant Project Experience

Longterm cites an electronic housing mold for a handheld device and a double-shot overmolding tool for a consumer electronics shell. Feedback on these projects refers to dimensional accuracy, surface finish, alignment, and consistent trial samples. Treat these examples as indications of experience, then confirm the requirements and acceptance criteria for your own part.

Frequently Asked Questions

How should I compare mold-life estimates?

The published range is 50,000–1,000,000 shots. Ask for the estimate tied to your specific design and do not assume the entire range is guaranteed.

Are both runner types available?

Yes. Cold-runner and hot-runner options are listed. Include your preference in the project requirements and confirm the final selection with the tooling supplier.

Which inspection steps are mentioned?

The listed checks include a mold trial, dimensional inspection, and full pre-shipment inspection. Confirm the applicable checks and documentation before placing the order.

Making a Tooling Decision

Before approving a quote, verify the material grades, runner configuration, tolerance and measurement plan, expected mold life, delivery schedule, and inspection scope. Longterm lists OEM custom mold making, mold making with injection molding, precision and overmold tooling, and mold development paired with plastic injection production among its business models. For technical support or project discussions, contact Roger Luo at rogerluo@longterm-mold.com.

About Longterm

Longterm Manufacturing Solutions Limited was founded in 2010 and supplies customers in the United States, Europe, Australia, and other international markets. Its capabilities include mold design and manufacturing, tooling, precision machining, and parts production. The company has 50 employees and a five-engineer R&D team focused on mold and precision machining projects. Its case examples cover consumer electronics, home appliances, and industrial equipment.