Boston Gear: 6 Real-World Questions from a Part-Time Purchaser

Everything I’ve learned managing Boston Gear orders for our plant

I’m the office administrator for a 150-person manufacturing company. I handle all our motion control ordering—roughly $80,000 annually across 8 vendors. When I took over purchasing in 2020, I knew nothing about gears or motors. Now? I’ve processed about 200 orders for Boston Gear products alone. Here are the questions I wish someone had answered back then.

Is Boston Gear still in business?

Short answer: yes. Boston Gear is still very much in business, operating as a brand under the Altra Industrial Motion umbrella. They’re not going anywhere.

I can’t speak to other legacy brands—I’ve only worked with Boston Gear for about 4 years. But in that time, I’ve never had trouble getting their products. The 700 series catalogs are current, and distributors near me all carry their inventory.

If you’re worried about support: I’ve called their application engineering team twice. Both times I got a real person who asked about our specific load requirements, not just read from a script.

Where can I find a Boston Gear catalog PDF?

You can download the full Boston Gear catalog PDF directly from their website. It includes the complete 700 series, motor options, gearboxes, and accessories.

In Q3 2024, I printed out the spur gear section for our maintenance lead. He preferred the paper version for quick reference. But I always keep the digital file handy because searching for a part number is faster when something breaks.

One thing that tripped me up early on: the catalog lists multiple mounting configurations for the same gearbox model. Make sure you’re looking at the right section before ordering. I assumed “C-Face” meant the same thing across different series. Didn’t verify. Turned out one series used a different bolt pattern.

“I learned never to assume one model number works the same as another—even within the same brand.”

What’s the right motor shaft coupling for a NEMA 23 stepper motor?

For a NEMA 23 stepper motor, you’ll typically need a coupling that fits a 0.25-inch shaft diameter—that’s the standard for most NEMA 23 motors.

But here’s the catch: motor shaft coupling selection depends on three things:

• Shaft diameter – confirm the exact size (most NEMA 23 motors use 0.25 inches)
• Torque requirements – your motor’s rated torque
• Misalignment tolerance – how much your shafts might be off

I’ve used standard jaw couplings for most of our NEMA 23 applications. They handle minor misalignment and aren’t expensive. But when we had a high-speed application (over 3000 RPM), the engineer specified a bellows coupling instead. That was outside my experience—I asked the application engineer at Boston Gear to confirm, and they agreed.

My experience is based on about 40 orders for NEMA 23 couplings. If you’re working with larger frame sizes or servo motors, your requirements will differ. Check the manufacturer’s data sheet for shaft dimensions before ordering.

What happens when a linear actuator fails?

When a linear actuator fails, it usually does one of three things: stops moving entirely, moves erratically, or makes noise you’ve never heard before. I’ve seen all three.

The most common cause in our facility? Contamination. We had a linear actuator on a packaging line that collected dust and debris. The seals weren’t rated for our environment. I assumed “industrial” meant “tough enough for anything.” Didn’t verify the IP rating. Turned out the standard actuator was only IP54—fine for clean rooms but not our dusty floor.

Another failure mode: overloading. If you exceed the rated thrust or speed, the internal components wear fast. We had one actuator that lasted only 14 months because the maintenance team programmed a higher speed than the spec sheet allowed.

When an actuator fails mid-cycle, it can jam your entire line. In 2023, our packaging line stopped for 6 hours because a failed actuator locked up. I ate the rush shipping cost for the replacement—$340 out of the department budget—because I hadn’t stocked a spare.

“Now I keep at least one spare for every critical actuator. The upfront cost hurts less than a line stoppage.”

Can Boston Gear handle everything—or do I need multiple vendors?

Boston Gear excels at gearboxes, speed reducers, and spur/worm gears. Their 700 series catalog is comprehensive for those products. But they’re not a one-stop shop for every motion control need.

For example: we sometimes need specialized servo motors for custom machinery. Boston Gear carries servo motors, but for a specific compact frame size our machine builder specified, we went with a different supplier. The vendor who said “this isn’t our strength—here’s who does it better” earned my trust for everything else.

I’d rather work with a specialist who knows their limits than a generalist who overpromises. Boston Gear’s application engineers told me straight up when a different brand’s motor would work better for a high-precision positioning application. That honesty saved me from making a bad order.

For routine gearbox and motor orders, I’m happy with Boston Gear. For niche or ultra-high-precision applications, I check with specialists. That boundary is healthy.

How do I order Boston Gear products without making expensive mistakes?

Here’s my process after making every mistake possible:

1. Start with the catalog PDF – find the exact part number, not just the product type
2. Confirm shaft diameters and mounting – don’t assume NEMA 23 fits everything
3. Check lead times – some gearbox variants take 6-8 weeks
4. Verify the invoice format – I learned this the hard way when finance rejected a handwritten receipt
5. Ask application engineering – a 10-minute call can save you from ordering the wrong spec

Honestly, I’m still learning. Every order teaches me something new about tolerances, mounting restrictions, or environmental ratings. But the mistakes I made in 2020 (like ordering a worm gear without verifying the ratio) don’t happen anymore. And that’s progress.