Injection Molding & Mold Making Capabilities
Everything happens within our organization in Spokane Valley, WA. Mold design, steel, machining, molding, inspection, assembly, packaging. No outside toolroom, no moving a program between three vendors and hoping the tolerances survive the trip.
That matters most when something changes. A dimension drifts. A gate needs work. A customer pulls a launch date in by six weeks. When the mold makers and the process technicians are forty feet apart, the fix is a conversation on the floor, not a purchase order and a shipping window.
Twenty-five presses, 55 to 400 tons. Shot sizes from 2.27 to 54.00 ounces. Engineering-grade thermoplastics held to ±0.001 in., with unilateral tolerances of +0.000 / −0.002 in. on programs that call for it. ISO 9001:2015 certified, with dimensional reporting quoted to whatever frequency your program needs — up to hourly checks.
Engineering & Design for Manufacturability
We approach every job from a DFM standpoint at step one.
That means we read the print before we quote it. If something in the geometry is going to cause trouble at the press, you hear about it then — not after the steel is cut and the first shots come out short.
Sometimes the answer is a change to draft, wall thickness, or gate location. Sometimes it’s clocking an insert so it can only load one way. Sometimes it’s redesigning the part so it doesn’t need the insert at all.
And sometimes the answer is that injection molding is the wrong process for what you’re building. We’ve told a customer exactly that. We’d rather have that conversation in week one than hand you a tool that was never going to produce the part you drew.
We can support SolidWorks, CAM programming, and mold flow analysis. The engineer who flags the problem is in the same building as the toolmaker who has to solve it.
Mold Making
Our toolroom builds prototype tools, bridge tooling, and full production molds in steel.
Mold makers run high-speed mills, grinders, lathes, welders, and polishing stations, and have been cutting steel for this shop for years. Single-cavity through multi-cavity — the agricultural plug program runs 16 parts per shot.
We also take in tooling built somewhere else. Mold transfer, mold repair, and requalification of a tool whose original builder is no longer in the picture. That work starts with an honest assessment of what you have: what the tool can still hold, what it needs, and whether repairing it is cheaper than replacing it. Occasionally it isn’t, and we’ll tell you.
Machining
Sinker EDM, CNC milling, surface grinding, and CAM programming, all in-house.
Keeping these capabilities under our own roof is the reason lead times hold. Cores, cavities, and inserts get cut, fit, and adjusted without a shipping leg in the middle of the build — and when a dimension needs to move during tryout, it moves that afternoon.
Single-part prototypes through complete mold builds. Same equipment, same people, same tolerances.
insert molding and Overmolding
We mold around metal — aluminum, steel, brass, threaded inserts, and metal-injection-molded components — and we overmold plastic onto plastic.
The plastic-on-plastic work is effectively two-shot, run without a dedicated two-shot machine. On one agricultural program, the first press molds an outer housing 16-up, a robot transfers the shot to a second press where a TPU soft interior is overmolded, and every part comes off through a vision inspection rig our team designed and built in-house.
There’s no tonnage ceiling on insert work. Small and mid-tonnage insert molding is routine, and we evaluate larger presses per program—the real constraint is never the press. It’s whether an operator can safely reach the mold, or whether a robot can be programmed to load it.
What we don’t do: we don’t mold around live electronics. That work needs low-pressure equipment we don’t have, and we’d rather say so than take the job and learn it on your part.
Medical and Life Sciences
We run single-use device components, specimen handling products, and drug delivery hardware for the life sciences market.
A higher-volume depth gauge program runs pre-colored PC/ABS in the hundreds of thousands annually, holding +0.000 / −0.002 in. on critical features. A specimen collection line runs 384-well and 96-well trays in medical-grade polypropylene, some glass-bottomed, at ±0.001 in. well-to-well. A spinal surgery dilator tube is overmolded directly onto an anodized aluminum component, ±0.002 in. in diameter, with no shorts permitted at end-of-fill.
On a single-use nasal delivery device, we mold the housing, the nose cones, and the light pipe. Clear polycarbonate on a separate allergen tray program is held to SPI 1A surface finish, with the mating PC/ABS components controlled to no more than a Delta-E of 1 across the entire part range.
Read more about our documentation and traceability standards.
Injection Molding
Twenty-five presses. 55 to 400 tons. Shot sizes from 2.27 to 54.00 ounces.
That range covers a pilot run of a few thousand parts and a production program shipping hundreds of thousands a year, without moving your tool to another building as volume climbs.
Materials we run every week: PC/ABS, polycarbonate, polypropylene, styrene, TPU, and pre-colored engineering-grade resins where color has to hold across the full part range. Tight-tolerance work is routine — ±0.001 in. well-to-well on multi-cavity trays, ±0.002 in. on overmolded diameters, and zero-short requirements on end-of-fill where a partial part is a scrapped part.
Process control is quoted to the program, not to a house standard. Baseline on most jobs is a dimensional check at startup and twice per shift, run against the dimensions that matter on that part rather than every callout on the print. Tighter programs get tighter control. If your quality system requires reporting on every shipment, we’re set up to handle it.
Quality
At H&H Molds, quality isn’t just a promise; it’s a structured process that guides everything we do. ISO 9001:2015 certification underscores our dedication to excellence & continuous improvement.
Assembly, Welding, and Packaging
Ultrasonic welding for plastic assemblies, in-line and off-line assembly, and custom-designed vision inspection where a defect can’t be allowed to leave the building.
We package to your specified quantities and labeling requirements, ready to go straight onto your line. Some secondary operations are run externally, with pad printing being the most common. We use vetted local partners & bring them back through incoming inspection.
We Serve a Wide Variety of Industries
At H&H Molds, we deliver specialized plastic molding services across industries with very different failure costs. In manufacturing, our precision-engineered components run inside heavy machinery and industrial tooling. Our medical injection molding work meets the regulatory standards of the life sciences sector — critical parts for testing, packaging, and drug delivery systems. Technology firms rely on us from prototype through full-scale production. In consumer goods, we turn concepts into durable, injection-molded products built for daily use. And in agribusiness, our agricultural molding supports irrigation systems and farm equipment that can’t afford downtime. Whatever the industry, the standard is the same: quality, precision, and parts that perform.
