NICE / APOLLO 35B25, SPROCKET, QUICK RELEASE
The Nice Apollo 35B25 quick release sprocket is a drive-train service part used in select Apollo slide gate operators where the gate chain and release mechanism must transfer power smoothly while still allowing service access or manual release function. On an older slide gate operator, a worn sprocket can cause uneven travel, chain chatter, slipping, binding, or inconsistent gate movement even when the motor and control board are working. This is not a generic sprocket to choose by appearance alone. The chain pitch, tooth count, hub style, and quick release assembly must match the operator parts diagram. For Apollo slide gates, especially older 7200/7300 style machines and later 7251/7351 references, the wrong sprocket can create chain alignment problems or damage other drive components.
Compatible With
This sprocket is commonly associated with the following Apollo slide gate applications when confirmed by the installed assembly and parts diagram:
- Nice Apollo 7251 slide gate operator
- Nice Apollo 7351 slide gate operator
- Select Apollo 7200 and 7300 slide gate quick release assemblies
- Apollo 7251/7351 parts-list references for sprocket, quick release
- Older Apollo slide gate operators using the matching #35, 25-tooth quick release sprocket assembly
Features and Specifications
| Manufacturer | Nice Apollo |
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| Product Type | Quick release sprocket |
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| Part Number | 35B25 |
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| Application | Slide gate operator quick release / chain drive assembly |
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| Chain Size | Commonly referenced as #35 chain based on 35B25 numbering |
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| Tooth Count | 25 teeth based on 35B25 numbering |
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| Compatible Operator Type | Select Apollo chain-drive slide gate operators |
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| Notes | Verify tooth count, chain pitch, bore/hub style, and operator parts diagram before ordering |
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Also Known As / Related Part Numbers
- 35B25
- Apollo 35B25
- Nice Apollo 35B25
- HYS-35B25
- Sprocket, quick release
- Quick release sprocket for Apollo 7251 / 7351
- Related but not interchangeable: 40BB17H idler sprocket
- Related but not interchangeable: 40BS13 #40 drive sprocket
Technician Note
Replace this sprocket only after checking the chain, idler, quick release hardware, and shaft alignment. A new sprocket will wear quickly if the gate chain is misaligned or overtightened.
Before Ordering
- Confirm the operator model and serial range if available
- Match the existing sprocket tooth count and chain size
- Inspect the quick release mechanism for worn pins or damaged hardware
- Do not order by outside diameter alone
- Check for related chain, idler, and shaft wear before completing the repair
Professional Advisory
Disconnect power and secure the gate before servicing chain-drive components. Heavy slide gates can move unexpectedly if the chain or release mechanism is loosened without proper support.
Product Questions and Answers
Which Apollo operators does the 35B25 sprocket commonly fit?
The 35B25 quick release sprocket is commonly associated with Apollo 7251 and 7351 slide gate operators and related 7200/7300 internal-limit slide operator assemblies when confirmed by the parts diagram.
Is 35B25 the same as a 40 chain sprocket?
No. The 35B25 number points to a #35 chain, 25-tooth sprocket style. Do not substitute it for #40 drive or idler sprockets used elsewhere in Apollo slide gate operators.
When should this quick release sprocket be replaced?
Common replacement reasons include worn teeth, chain jumping, a damaged quick release hub, excessive side play, or a gate that will not drive smoothly even after chain tension and alignment are checked.
Can this part be used on Apollo 3500 swing gate operators?
No. The 35B25 quick release sprocket is for select Apollo slide gate quick release assemblies and should not be used as a 3500 series swing gate sprocket.
What should be checked before ordering?
Match the installed sprocket tooth count, chain size, hub style, shaft fit, and Apollo parts diagram. Similar-looking sprockets may have different chain pitch or bore details.
