1/4" x 3/4" Zinc Plated Flat Head Carriage Bolts & Lock Nuts with Knurled Neck, 25 Sets, Track Hardware Replacement for Garage Doors, Curved Rails & Extension Ladders
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- Precision Fit & Anti-Spin Design: Engineered with a unique knurled neck that securely grips the hardware hole, preventing the bolt from spinning during installation. This flat head design ensures a flush, snag-free finish on your garage door tracks or ladder rungs.
- Universal Garage & Ladder Compatibility: The perfect 1/4-20 x 3/4" replacement kit for vertical and curved garage door tracks. Also widely used for repairing extension ladder hinges and rails. A versatile hardware essential for both homeowners and professional garage door technicians.
- Corrosion-Resistant Zinc Finish: Manufactured from high-strength steel with a premium zinc plating. Designed to resist rust and corrosion in humid garage environments, ensuring long-lasting structural integrity and safety for your overhead door systems.
- Secure Self-Locking System: Each set includes a matching lock nut designed to stay tight under constant vibration and tension. Replace your worn-out, loose hardware with this professional-grade kit to restore smooth, quiet operation to your door tracks.
- Bulk 25-Set Project Value: Comes in a convenient 25-piece bulk pack, providing enough hardware for a full track overhaul or multiple ladder repairs. A must-have for your home maintenance kit to handle emergency repairs quickly and efficiently.
Estimated shipping
Select a product to estimate shipping.Why Choose Our Bolts?
Anti-Loosening Tech: The knurled neck and ribbed design create a “locked-in” effect, even in high-vibration environments.
Corrosion Resistance: Zinc plating shields against moisture, chemicals, and UV exposure.
25-Pack Convenience: Stock up for multiple projects—no mid-job hardware runs!
Why do garage door vertical and curved tracks require a "Flat Head" bolt? Can I use a standard carriage bolt?
Standard carriage bolts protrude into tracks, causing rollers to bump, wear, or derail. Our Flat Head track bolts sit perfectly flush with the interior steel track wall, providing a seamless, quiet pathway for the rollers.
What is the purpose of the "Knurled/Ribbed Neck" under the flat head?
Tight corners make holding a bolt inside tracks impossible. Our Ribbed Neck features teeth that bite into bracket slots to lock the bolt, allowing single-wrench tightening from the outside and preventing spin-out.
What are the exact dimensions of these bolts? Will they fit my standard residential tracks?
Standard specs:
1. Thread Size: 1/4"-20 coarse thread.
2. Length: 3/4" (19mm) under-head length, the universal size for splicing residential vertical and curved track joints.
3. Nut Drive Size: 7/16-inch Hex Serrated Flange Lock Nut.
Why do you provide "Serrated Flange Lock Nuts" instead of standard hex nuts?
Shaking loosens plain nuts, causing track collapse. Our kit includes Serrated Flange Lock Nuts. The serrated teeth grip the bracket, acting as integrated lock washers that stay tight under severe, long-term vibration.
Can these flat head bolts be used to repair Werner or Louisville extension ladders?
Yes! Used for extension ladders (Werner, Louisville, Keller) to secure locks/shoes. Flat heads sit flush so sliding ladder sections pass smoothly without catching, scratching, or jamming, unlike protruding standard bolts.
Product details
| Main Specification | |
|---|---|
| 制造商 | Eteng Metals |
| 单位数 | 25 计数 |
| 外边完成 | 锌 |
| 金属类型 | 合金钢 |
| 标题样式 | 平面 |
| 制造商级别 | Grade 2 |
| 线索覆盖 | 部分线索 |
| 外部参数 | 0.25 英寸 (0. |
| 品牌 | eturnloger |
| 头型 | 平面 |
| 项目数 | 第25条 |
| 快捷键类型 | Carriage Bolt |
| 包含的组成部分 | bolts and nuts |
| 直径 | 0.25 英寸 (0. |
| 块数 | 第25条 |
| 变速器大小 | 1/4 inch |
| 线索大小 | 1/4"-20 |
| 材料 | 合金钢 |
| 颜色 | 银 |
| 线索类型 | 调值 |
| Product information | |
| 设置名称 | 25-Piece Zinc Plated Flat Head Carriage Bolt and Lock Nut Set |
| Technical Details | |
| Material | Alloy Steel |
| 型号 | CB25USA |
| Thread Size | 1/4"-20 |
| 材料类型 | 合金钢 |
| Brand | Eturnloger |
| 线索样式 | 左手边 |
| 兼容的格鲁夫直径 | 0.25 英寸 (0. |
| 项目硬度 | Grade 5 |
| Item details | |
| 项目类型名称 | Carriage Bolt and Nuts |
| Style | |
| 完成类型 | 银 |
| Measurements | |
| 项目尺寸 | 0.8 x 0.43 x 0.43 inches |
| Others | |
| 产品类型 | Carriage Bolt and Nuts |
| 评级 | Class 5 |
| 大小名称 | 1/4 in |
| 螺丝头样式 | 平面 |