Safety Leaf Garage Door Bumper Set with Brackets
Heavy-duty leaf-style bumper springs designed to stop door over-travel, absorb impact, and help maintain lifting-cable tension.
The Clopay Safety Leaf Bumper Set mounts near the rear of the horizontal tracks on a compatible sectional overhead door. As the door reaches the fully open position, the leaf springs cushion and limit its travel before the rollers can strike the ends of the tracks or leave the intended track area.
The stored spring force also provides a controlled push when the door begins closing. This is especially useful with compatible jackshaft-operated doors, where maintaining lifting-cable tension at the fully open position helps prevent loose cables, cable overlap, and improper winding around the cable drums.
Limits Door Over-Travel Helps stop the fully open door before it strikes the rear of the horizontal tracks or travels beyond the intended stopping point.
Maintains Cable Tension Helps keep the lifting cables tight and seated in their cable-drum grooves when the door is fully open.
Complete Pair Includes two leaf-style bumper assemblies and mounting brackets for both horizontal tracks.
Key Features
- Leaf-style garage door bumper spring set
- Designed for compatible sectional overhead doors
- Installs near the rear ends of the horizontal tracks
- Helps prevent the door from slamming into the track ends
- Helps prevent excessive open-position travel
- Absorbs and cushions door impact
- Helps keep lifting cables under tension
- Helps keep cables properly wrapped around the drums
- Provides an initial push as the door begins closing
- Especially useful with compatible jackshaft-style operators
- Suitable for compatible residential and commercial doors
- Heavy-duty steel construction
- Mounting brackets included
- Sold as a pair
Product Specifications
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Manufacturer: Clopay
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Part Number: 0121570
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Product Type: Garage door safety leaf bumper set
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Bumper Style: Leaf spring
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Material: Heavy-duty steel
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Mounting Location: Horizontal garage door tracks
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Typical Track Application: Compatible standard-radius track systems
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Typical Operator Application: Jackshaft-style garage door operators
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Door Applications: Compatible residential and commercial sectional overhead doors
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Primary Functions: Impact absorption, over-travel control, and cable-tension support
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Mounting Brackets: Included
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Package Quantity: Two leaf bumpers with brackets
Common Applications
- Commercial sectional overhead doors
- Residential sectional doors with compatible hardware
- Doors using jackshaft-style operators
- Standard-radius horizontal track systems
- Doors that over-travel in the fully open position
- Doors that strike or slam into the rear track stops
- Doors with cables that loosen when fully open
- Applications needing a compact alternative to torpedo-style bumper springs
How Leaf Bumpers Work
- The garage door travels rearward along the horizontal tracks.
- The upper area of the door contacts the leaf-style bumper assemblies.
- The leaf springs flex to absorb impact and stop excessive travel.
- Spring pressure helps keep the door positioned against the counterbalance system.
- When closing begins, the bumpers provide a controlled forward push.
- The lifting cables remain tensioned as the cable drums begin rotating in the closing direction.
Designed for Horizontal Track Installation: The bumper assemblies attach near the rear of the horizontal garage door tracks. Their placement must allow both sides of the door to contact the bumpers evenly without interfering with the rollers, hinges, operator, track supports, or surrounding structure.
Jackshaft Operator Benefit: Jackshaft operators rotate the torsion shaft rather than pulling the door with a ceiling-mounted trolley. Leaf bumpers can provide the initial door movement needed to keep the cables tensioned while the shaft begins turning in the closing direction.
Leaf Style vs. Torpedo Style
Leaf bumpers use curved or layered steel spring sections that flex when contacted by the door. Their compact profile can work well where a long plunger-style assembly is unnecessary or where available mounting space is limited.
Torpedo-style bumpers use enclosed coil springs and sliding plungers to provide greater travel. The correct style depends on the door weight, track layout, available backroom, operator type, required spring travel, and the amount of closing assistance needed.
Not a Counterbalance Spring: Leaf bumpers do not replace the garage door’s torsion springs, extension springs, cable drums, or other counterbalance components. They provide impact control and limited closing assistance only and must not be used to compensate for an incorrectly balanced door.
Mounting Hardware Notice: Mounting brackets are included. Exact fasteners, bolts, nuts, washers, track clips, and reinforcement hardware are not itemized in the manufacturer’s public product information. Additional hardware may be required for the specific track and support structure.
Installation and Adjustment
Install one bumper on each horizontal track at equal distances from the door opening. Both bumpers should contact the door at approximately the same time and flex evenly. Position them to stop excessive travel and maintain cable tension without applying unnecessary pressure to the top section, rollers, hinges, track, or operator system.
Inspect the Door Before Installation: Loose cables or over-travel can also result from incorrect operator limits, wrong cable drums, improper spring balance, damaged track, worn rollers, insufficient track pitch, incorrect high-lift geometry, or inadequate rear track stops. Diagnose and correct the underlying door condition before installing bumpers.
Compatibility Notice
Verify the door type, door weight, track size, track radius, horizontal-track length, top-section position, operator type, cable-drum arrangement, open-position cable tension, available backroom, bumper contact point, mounting-hole requirements, and structural support before ordering. These bumpers are not automatically compatible with every standard-lift, high-lift, vertical-lift, or low-headroom door system.
Keep Clear of the Spring Area: Leaf bumpers flex and store mechanical energy when compressed. Keep hands, tools, wiring, operator cords, and other objects away from the contact and travel areas while the door is moving.
Safety Warning: Overhead doors, torsion springs, lifting cables, cable drums, and bumper springs can store substantial mechanical energy. Disconnect and lock out the operator, secure the door against movement, and keep clear of the bumper travel area during installation. Never loosen springs, cables, drums, bottom brackets, or other components under tension. Installation and adjustment should be performed by a qualified garage door technician.
