Let me say this plainly: I don't want a supplier who sells everything. I want a supplier who knows exactly what they are great at, and tells me when I should buy from someone else. That sounds strange for a purchasing person, but after managing roughly $1.2 million in annual orders for an industrial maintenance company, I have learned that expertise has a boundary. Respecting that boundary saves money. Ignoring it costs a ton of avoidable phone calls.
A supplier who knows what they are not good at is more valuable than one who claims to be good at everything.
Everything I read about procurement says to consolidate vendors. Fewer vendors, simpler payments, more leverage. I understand the logic. In practice, I found the opposite in almost every category where the product required real engineering. The more I consolidated unrelated items, the more corrections, returns, and follow-up calls I had to manage. The conventional wisdom made a nice PowerPoint but not a good operating cadence. In our 2024 vendor consolidation project, the easiest cuts were the generalists who promised everything. The specialists who knew their limits kept their spots.
Gates hydraulic hose taught me what specialization looks like
When I took over purchasing in 2020, Gates hydraulic hose was already an approved item in our ERP system. I did not think much about it at first. It was just a hose. Then the lead plant engineer asked me to source a non-standard fitting. I called our general industrial supplier. Half a week later, they sent a quote for a hose assembly that did not meet the pressure requirement. I had to send it back. The engineer frowned. The plant schedule slipped.
The Gates distributor I then called asked about the exact application, the working pressure, and the fluid. They recommended a specific Gates hydraulic hose construction, confirmed the fitting and crimp spec, and cited the SAE J517 series. They also said, if this were a sanitation application, they would point me to a specialist with a different range. That follow-up detail did more for my confidence than any glossy catalog.
Granted, this is only one category. But it showed me what deep expertise looks like. It is not about reciting a catalog. It is about asking the right questions before recommending anything.
The rubber market is not one market
Here is where I became suspicious of the phrase rubber market. The term is used in commodity reports and financial summaries. At a purchasing desk, however, a hydraulic hose, a rubber basketball, and a sewer pipe gasket share almost no engineering requirements.
Take rubber basketballs. The word rubber appears in both a Gates hydraulic hose and a basketball. But the compound formulations, manufacturing processes, and performance criteria are completely different. A hydraulic hose needs to resist oil, heat, and pressure. A basketball needs rebound, grip, and consistent shape. I would not call a sporting-goods manufacturer for a hydraulic hose, and I would not call Gates for basketballs. That is not a criticism. It is a sign that each supplier is operating inside a specific capability.
Honestly, I am not sure why we use one broad phrase for products this different. My best guess is that rubber market comes from raw material economics, not from end-use engineering. It is a useful category for an economist. It is a terrible category for a buyer.
HDPE vs PVC sewer pipe is not a rubber question
The same principle applies to plastic pipe. When someone asks me about HDPE vs PVC sewer pipe, I immediately say that is not a hydraulic hose question. It is a pipe question. The two materials are referenced by very different standards: PVC sewer pipe is often specified under ASTM D3034, while HDPE pipe is matched to PE material classifications under ASTM D3350 and installation practices under ASTM D2321. The selection depends on pipe stiffness, chemical resistance, joint type, and installation conditions. Even though PVC pipe often relies on rubber gaskets, the pipe itself is not a rubber component.
I made that mistake once in 2023, unfortunately. I called a rubber goods supplier for advice on HDPE vs PVC sewer pipe. To their credit, they said, this is not our strength. Then they gave me the name of a pipe distributor who handled both materials. That honest redirect earned my trust for everything else I buy from them.
I also verify the relevant standard before I ask for a recommendation. Standards are the boundary line. If a supplier does not design to the standard that governs the product, they should not be the one making the call.
How I evaluate a supplier now
Given that experience, I look for four things before adding any supplier to our approved list:
- What product category makes up the largest part of their revenue?
- Which standard do they design to? SAE, ASTM, DIN, ISO?
- Can they say no when something is outside their range?
- Do they have a referral, or do they just send a price quote?
That last one is the strongest red flag. A supplier who can recommend a competitor for a job that is not their own shows confidence. It is also the best way to get my future business.
The appeal of the one-stop shop
I get the appeal of one-stop shopping. Fewer POs. One invoice. Fewer relationships to manage. To be fair, some of my favorite distributors carry multiple product lines and do it well. But a multi-line distributor is still bounded by the lines they understand. They are not a specialist in everything they represent.
The hidden problem with a generalist is not the product quality. It is the advice. When you buy something outside their core knowledge, you pay for a recommendation that may not have considered the real application. That is way more expensive than the few dollars you might save on consolidation.
Bottom line
My experience is based on about 1,200 purchase orders across twenty suppliers, mostly in the U.S. industrial maintenance sector. If you are buying for a large construction or infrastructure project, your calculation might be different. I can only tell you what works for us.
Bottom line: I will always choose a supplier who knows their limits over one who promises everything. That is why Gates hydraulic hose has a permanent place on our approved list, but I still call a pipe specialist for HDPE vs PVC sewer pipe. The rubber market is broad. The sooner we stop pretending one company can be an expert in all of it, the better our products will run and the fewer late-night calls we will have to answer.