About Us
About Us — Twin Spring Coupling
We Know Couplings — Because We Built One
Twin Spring Coupling was founded by Darren Finch, a power transmission engineer with over 15 years of hands-on experience designing, specifying, and maintaining industrial couplings across automotive, agricultural, mining, and industrial applications.
That experience led to something unusual: we designed and patented our own coupling — a maintenance-free coil spring design capable of handling up to 45° of misalignment at high speed without bearings, grease, or wear components. It was a genuine engineering achievement that taught us more about how couplings work, fail, and get specified than any textbook could.
That journey — developing a product, testing it against every major coupling type on the market, and understanding exactly where each design excels and falls short — is the foundation of everything we do today.
What We Do Now
We’re an independent coupling resource. We don’t manufacture. We don’t distribute. We have no products to push and no supplier relationships that influence what we recommend.
What we do is use 15 years of engineering knowledge to help maintenance engineers, plant managers, procurement teams, and DIY builders find the right coupling at the right price — then connect them directly to it on Amazon or eBay, where they get the best available pricing with no middleman markup.
We cover the full range of power transmission coupling types:
– **Jaw and spider couplings** — Lovejoy L-series, TB Woods, Martin, Boston Gear
– **Universal joints** — Spicer, Moog, Lovejoy D-series, Neapco, GMB
– **Grid couplings** — Falk SteelFlex, Lovejoy, SKF
– **Disc and bellows couplings** — Ruland, Lovejoy
– **Oldham couplings** — Ruland, precision servo applications
– **PTO and agricultural driveline** — Weasler, Neapco
– **Speed reducers and drive components** — Dayton, Worldwide Electric, Boston Gear
We also write the technical content that helps you choose correctly before you buy — coupling type comparisons, size and torque guides, cross-reference tables, installation notes, and application guides built from real engineering experience.
Why Independent Matters
Most coupling information online comes from manufacturers promoting their own products, or distributors pushing whatever they have in stock.
We have neither of those pressures. When we say a Lovejoy L-075 jaw coupling is the right call for your log splitter, it’s because we know it is — not because we have a Lovejoy contract. When we recommend a disc coupling over a jaw coupling for a servo motor application, it’s because zero backlash actually matters there, and a jaw coupling won’t deliver it.
That independence is the value we offer. Use it.
Who We’re For
**Maintenance engineers** who need to identify a coupling type, find the cross-reference, and get it on order without wading through a distributor catalogue.
**Plant managers and procurement teams** who want confidence that they’re specifying the right product at a fair price before raising a purchase order.
**Small manufacturers and machine builders** who are specifying couplings for a new drive system and need straight technical guidance without a sales call.
**Agricultural and automotive users** who need to identify a U-joint or PTO coupling by series and fit it to their equipment.
If you’re not sure which coupling you need, our [coupling type guide](#), [brand cross-reference tables](#), and [application guides](#) are the best place to start. If you still can’t find what you need, use the contact page — we read every message.
The Numbers
– **4,000+ coupling products** compared and listed across all major brands
– **15 years** of power transmission engineering experience behind every recommendation
– **Industrial, agricultural, automotive, and mining** applications covered
– **Amazon and eBay** — every product links directly so you see live pricing
*Twin Spring Coupling is an affiliate site. We earn a small commission when you purchase through our links, at no cost to you. That commission is paid by the retailer, not added to your price. It’s how we keep the lights on while keeping our advice independent.*