Shopping for bearings, couplings, and power transmission parts often comes down to a simple fork: you need to connect two rotating shafts, but do you want a rigid metal link or a plastic coupler that wraps around sprocket teeth? The two parts here answer that question differently. One is a 7/8" bore rigid coupling with four set screws. The other is a pair of Delrin plastic sprocket couplers built for line shaft conveyors. Your shaft size and conveyor layout decide which one is actually useful to you.
Quick Verdict
If you need a fixed shaft connection, the rigid shaft coupling is the straightforward choice. If you're working on a line shaft conveyor and need a sprocket-to-sprocket coupler, the Delrin pair is the more specialized option.
Comparison at a Glance
| Product | Price | What it is | Best for |
|---|---|---|---|
| Shaft Coupling 7/8" Bore 1-3/4" OD 2" Length Rigid Coupling, 4 Set Screws | USD 34.32 | Steel rigid coupling with black oxide coating and four set screws | Direct shaft-to-shaft connection |
| Delrin Coupler Plastic Sprocket Coupling Chain for Line Shaft Conveyor - Qty 2 | USD 69.71 | Two Delrin plastic couplers with lock pins for 4016 sprockets | Line shaft conveyor sprocket connections that need a clean, easy install |
Where Each One Wins
Choose the rigid coupling when:
- You're connecting two shafts directly.
- You want a rigid steel body for a fixed, torque-transmitting connection.
- Four set screws give you firm, precise holding.
Choose the Delrin coupler when:
- You're joining sprockets on a line shaft conveyor.
- You want a plastic coupler that is cleaner than a grease-laden steel chain coupler.
- You need a two-piece set with lock pins.
Product Notes
Shaft Coupling 7/8" Bore 1-3/4" OD 2" Length Rigid Coupling, 4 Set Screws
This is a direct, no-fuss shaft connector. It's made from 45# (ASTM1045) steel with a black oxide coating, so it can handle torque and resist corrosion. The four set screws let you lock the coupling onto each shaft firmly, and the simple design means you don't need special tools for installation. At $34.32, it's the lower-priced product in this pair. The listed sizing is a 7/8" bore, 1-3/4" outside diameter, and 2" length, so it fits that specific shaft diameter. One limitation is the California Prop 65 warning included with the product for cancer and reproductive harm; if that matters for your work environment, weigh it before buying.
Delrin Coupler Plastic Sprocket Coupling Chain for Line Shaft Conveyor - Qty 2
For a line shaft conveyor, this two-piece set solves a different problem. You get two Delrin plastic couplers with lock pins, and they work by wrapping around the sprocket teeth and pushing the locking pin through. They're designed to fit any brand of 4016 sprockets, and they're made in the United States. Installation is clean compared with a steel chain coupler: no grease and no small parts to keep track of. The trade-off is price: at $69.71, this set costs noticeably more than the rigid shaft coupling. It's also a dedicated sprocket coupler, so it won't connect two bare shafts the way a rigid coupling can.
Final Choice by Use Case
For a simple shaft-to-shaft connection, go with the rigid shaft coupling. For conveyor sprocket work, the Delrin coupler pair is the designed-for-the-job choice. Pick based on whether you're joining shafts or sprockets, not just on price.
