LiftMaster Q003 / K07-50637 Slide-Gate Chain Adjustment Bolt
LiftMaster Q003 / K07-50637 Slide-Gate Chain Adjustment Bolt
The LiftMaster Q003 is a replacement chain bolt for compatible chain-driven sliding-gate installations. The supplier identifies manufacturer part number K07-50637 for this item, and LiftMaster documentation lists that reference as a chain bolt. It is a mechanical service component used in the appropriate chain attachment and adjustment arrangement. Confirm the exact operator and mounting hardware before ordering; this is not a complete drive-chain package, master link or universal bolt for every gate.
Compatibility — Models, Versions and Exclusions
| Model or selection point | Compatibility requirement |
|---|---|
| SL3000U | Manufacturer parts list identifies K07-50637 as the chain bolt. |
| Other LiftMaster slide operators | Use the model’s own parts documentation; shared chain size does not prove bolt fit. |
| Chain and connecting links | Separate components; select the correct chain family and manufacturer requirements. |
| Swing-gate actuator hardware | A different mechanical arrangement; no substitution is established. |
Identify the Chain Attachment, Not Just the Chain Size
The bolt, mounting bracket and chain connection work as an assembly. Photograph the complete attachment point as well as the operator label before ordering. A familiar chain size does not establish the bolt’s thread, available adjustment or bracket fit. When the original hardware is damaged or missing, the equipment diagram is more reliable than choosing a visually similar general-purpose fastener.
Uneven movement can result from a worn chain, poor alignment, damaged mounting support or other drive components. A replacement adjustment bolt should not be used to compensate for an unsuitable chain path or a binding gate. Have the technician evaluate the entire attachment and drive arrangement, then set the chain as directed by the operator instructions rather than simply making it as tight as possible.
Specifications and Product Identification
| Specification | Details |
|---|---|
| Supplier SKU | Q003 |
| Manufacturer part number | K07-50637 |
| Component | Slide-gate chain bolt |
| Documented example | SL3000U repair-parts list |
| Selection basis | Exact parts diagram and installed chain attachment |
| Dimensions | Confirm required thread, length and mounting details before substituting by measurement |
Before Ordering
- Match Q003 or K07-50637 to the exact operator parts list.
- Inspect the chain bracket, connection and available adjustment space.
- Identify the installed chain size before ordering chain or links separately.
- Check for worn threads, distorted supports and damage elsewhere in the drive.
Package Contents and Separate Requirements
This SKU identifies the chain-bolt service item. The SL3000U parts list separately identifies a hardware kit containing a chain bolt and chain bracket; do not assume that larger kit is included with this individual item. Confirm nuts, washers and any required bracket against the current supplier inventory before purchase.
Safety Warnings — Read Before Installation or Service
- WARNING: Gate movement and exposed chain-drive components can cause crushing, pinching or entanglement injuries. Have a qualified gate technician perform the repair.
- Disconnect operator and backup power where fitted, and secure the gate against movement before loosening chain hardware.
- Do not reach into an energized chain path or attempt adjustment while another person operates the gate.
- Restore correct alignment and guarding, then perform the required operating and safety-device checks before normal service.
Related Products and Important Differences
- #41 roller chain, 10-foot length — a separate drive-chain option only where #41 chain is specified; verify the required length and grade.
- #41 roller-chain master link — a separate connecting link for the matching chain family, not a replacement for Q003.
Frequently Asked Questions
Does Q003 include a new drive chain?
No complete chain package is represented. Select any replacement chain and links separately.
Can I use it with any #41-chain gate?
Chain size alone is insufficient. The bolt and bracket arrangement must match the operator documentation.
Is it the same as a master link?
No. A master link joins a roller-chain loop; this listing identifies the chain adjustment/attachment bolt.
Should the chain be pulled completely tight?
Use the equipment manufacturer’s specified adjustment. Over-tightening is not a substitute for correcting wear or misalignment.
Need Help Confirming the Right Product?
Contact Garage-DoorParts.com before ordering. Send the full equipment model, readable part labels and photographs of the installed assembly. Include the dimensions, electrical configuration or accessory details relevant to your project so the listing can be checked against the actual installation.
Details
Need Help With Compatibility?
Not sure if this is the correct part for your garage door, operator, gate system, or application? Contact Us before ordering — we’re happy to help.
Garage-DoorParts.com carries a large selection of residential and commercial parts, and many components can look similar while having important differences in dimensions, model numbers, voltage, mounting, or compatibility.
For the best assistance, please provide as much information as possible, including the manufacturer, model number, part number, door or operator type, dimensions, and clear photos of the existing part or equipment.
Our goal is to help you identify the correct product before you order and reduce the possibility of ordering an incompatible part.
Contact Us with your product questions and compatibility information, and we’ll do our best to point you in the right direction.
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