Overmolding vs. Insert Molding: What the Terms Actually Mean
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Overmolding vs. Insert Molding: What the Terms Actually Mean

Custom Parts, Engineering, Tooling

Overmolding vs. Insert Molding: What the Terms Actually Mean

By H&H Molds Inc.|2026-06-15T13:02:38-07:00June 15th, 2026|Custom Parts, Engineering, Tooling|

Ask three molders to define overmolding, and you might get three different answers. None of them wrong, exactly, but that’s the problem.

The terms overmolding and insert molding are used interchangeably across the industry, and no governing body has settled the issue.

That means when you go to spec your next part and say ‘overmolding,’ the shop on the other end might be hearing something entirely different.

Here’s how we make this call →

Standard Injection Molding Tolerances – What to Know
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Standard Injection Molding Tolerances – What to Know

Engineering, Materials, Optimization

Standard Injection Molding Tolerances – What to Know

By H&H Molds Inc.|2026-06-16T07:43:54-07:00June 7th, 2026|Engineering, Materials, Optimization|

Most buyers ask for “standard tolerances” and assume that settles it. It doesn’t.

There’s no universal number that fits your part, only what the material, the geometry, and the tool will actually let you hold. Ask for standard, and you’ll get the widest band the process gives away.

The molding shops that don’t explain this up-front will be the same ones that hand you a bad first sample and a change order →

Screw-Off Cores vs. Slides: Injection Mold Draft Requirements
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Screw-Off Cores vs. Slides: Injection Mold Draft Requirements

Engineering, Mold Design

Screw-Off Cores vs. Slides: Injection Mold Draft Requirements

By H&H Molds Inc.|2026-06-01T10:14:56-07:00May 30th, 2026|Engineering, Mold Design|

Many injection molding thread failures don’t start at the press.

Thread failures often begin with CAD – when an engineer designs a thread profile without first considering the ejection process.

The sequence of thread first, ejection second, is backward, and it’s where draft mistakes get baked in.

Screw-off cores (also called unscrewing cores) and side-action slides both handle threaded features, but they impose completely different draft requirements on the part.

Not just different angles. →

Injection Molding Drag Marks: Who Owns the Problem?
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Injection Molding Drag Marks: Who Owns the Problem?

Engineering, Optimization, Processes

Injection Molding Drag Marks: Who Owns the Problem?

By H&H Molds Inc.|2026-04-02T12:05:05-07:00April 2nd, 2026|Engineering, Optimization, Processes|

Drag marks don’t become expensive when they show up on parts. They become expensive when three vendors all stare at the same defect photo, but everyone claims it belongs to someone else.

We see this constantly with new tooling launches and transfer programs: the buyer leans on the molder because the molder shipped the parts, even when the real cause was built into the steel or the geometry months earlier.

Most cases →

Simulation vs. Steel: How Experienced Shops Decide
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Simulation vs. Steel: How Experienced Shops Decide

Mold Design, Engineering, Tooling

Simulation vs. Steel: How Experienced Shops Decide

By H&H Molds Inc.|2025-08-23T13:52:53-07:00August 21st, 2025|Mold Design, Engineering, Tooling|

If you hang around enough mold shops, you’ll hear the same argument play out again and again.

Some folks swear by simulation as if it were gospel; others roll their eyes and point to the stack of plastic parts on the bench that turned out just fine without a single line of Moldflow code.

Here’s the straight truth: simulation is just one tool—no more, no less. It’s not a badge of honor →

Over-Engineering Can Kill Your Product Before it Ever Gets a Chance to Launch
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Over-Engineering Can Kill Your Product Before it Ever Gets a Chance to Launch

Processes, Engineering, Tooling

Over-Engineering Can Kill Your Product Before it Ever Gets a Chance to Launch

By H&H Molds Inc.|2025-08-20T14:05:07-07:00August 14th, 2025|Processes, Engineering, Tooling|

You’ve seen it before: a new product idea hits the whiteboard, everyone’s excited, and suddenly the engineering team is off to the races building the next Swiss Army knife. Six months later, you’re drowning in features nobody asked for, the budget’s gone, and your so-called prototype is still glued to the test bench.

Welcome to the prototype paradox—where over-engineering early doesn’t make you smarter, it quietly murders your product →

Smart Mold Design Lowers Total Part Cost—Not Just Mold Cost
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Smart Mold Design Lowers Total Part Cost—Not Just Mold Cost

Mold Design, Engineering, Materials

Smart Mold Design Lowers Total Part Cost—Not Just Mold Cost

By H&H Molds Inc.|2025-07-24T07:34:30-07:00July 23rd, 2025|Mold Design, Engineering, Materials|

Here’s the dirty little secret most injection mold buyers never hear:

Chasing the lowest mold quote is like penny-pinching on shoes and wondering why you keep getting blisters. The upfront price tag might look appealing, but it’s the hidden costs—in wasted resin, sluggish cycle times, and endless fixes—that eat away at your profits.

At H&H Molds, we don’t just build molds; we engineer profit machines.

Let’s pull back the curtain on how up-front →

Beyond the Press: Post-Molding Operations Can Make or Break Your Final Product
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Beyond the Press: Post-Molding Operations Can Make or Break Your Final Product

Engineering, Processes

Beyond the Press: Post-Molding Operations Can Make or Break Your Final Product

By H&H Molds Inc.|2025-07-21T13:07:15-07:00July 18th, 2025|Engineering, Processes|

Many buyers focus on what happens before and during the injection molding process — tool design, resin choice, and cycle optimization.

But what happens after the part is molded is just as critical — and often overlooked.

At H&H Molds, we’ve designed our post-molding operations to help take control of the entire production journey. That includes what happens after the press cycle finishes. Because while molding creates the part, it’s what happens →