--- product_id: 77801435 title: "Letool 4pcs U Type Groove Pulley Nylon Guide Pulley Rolling Bearing U Groove Roller Wheel 8x40x20mm for Driving Mechanical Equipment, or Used in Doors and Windows" brand: "lyjee" price: "€ 2.60" currency: EUR in_stock: false url: https://www.desertcart.gr/products/77801435-letool-4pcs-u-type-groove-pulley-nylon-guide-pulley-rolling store_origin: GR region: Greece --- # 167kg max load-bearing power Smooth 608ZZ ball bearing roll 8mm inner diameter precision fit Letool 4pcs U Type Groove Pulley Nylon Guide Pulley Rolling Bearing U Groove Roller Wheel 8x40x20mm for Driving Mechanical Equipment, or Used in Doors and Windows **Brand:** lyjee **Price:** € 2.60 **Availability:** ❌ Out of Stock ## Summary > 🛠️ Elevate your mechanics with precision and power — don’t get left behind! ## Quick Answers - **What is this?** Letool 4pcs U Type Groove Pulley Nylon Guide Pulley Rolling Bearing U Groove Roller Wheel 8x40x20mm for Driving Mechanical Equipment, or Used in Doors and Windows by lyjee - **How much does it cost?** € 2.60 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/77801435-letool-4pcs-u-type-groove-pulley-nylon-guide-pulley-rolling) ## Best For - lyjee enthusiasts ## Why This Product - Trusted lyjee brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Heavy-Duty Load Capacity:** Supports up to 167kg (368lbs) — built to handle your toughest projects with ease. - • **Precision U-Groove Design:** Engineered for seamless tracking and perfect alignment in mechanical systems. - • **Silent & Smooth Operation:** High-quality nylon and ball bearings ensure whisper-quiet, friction-optimized performance. - • **Durable High Carbon Steel Core:** Combines strength and longevity to keep your equipment running reliably over time. - • **Versatile Industrial & Home Use:** Ideal for doors, windows, dollies, and custom mechanical drives — upgrade your setup effortlessly. ## Overview The Letool 4pcs U Type Groove Pulley set features 8x40x20mm nylon rollers with 608ZZ ball bearings, designed for smooth, silent operation and a robust 167kg load capacity. Perfect for driving mechanical equipment or upgrading door and window tracks, these durable pulleys combine high carbon steel strength with versatile industrial-grade performance. ## Description Letool 4pcs U Type Groove Pulley Nylon Guide Pulley Rolling Bearing U Groove Roller Wheel 8x40x20mm for Driving Mechanical Equipment, or Used in Doors and Windows: desertcart.com: Tools & Home Improvement ## Features - Letool 4pcs U type groove pulley nylon Guide Pulley Rolling Bearing U Groove Roller Wheel 8x40x20mm for Driving Mechanical Equipment, or Used in Doors and Windows - 【U-GROOVE SIZE】Inner Diameter: 8mm/0.3in, Outer Diameter: 40mm/1.6in, Thickness: 20.7mm/0.8in. - 【OPERATION ADVANTAGES】: Stable and smooth operation, good mute effect, practical and durable. - 【WIDELY USED】Widely used in doors and windows to track and drive mechanical equipments. These gadgets can be used to build the track system or replace the wheels on the dolly. - 【Max Load-bearing】: the wheels are very strong and the bearing capacity is stronger.Max Load-bearing is 167kg/368lbs ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01M9G96S6 | | Bearing Number | 608ZZ | | Bearing Type | Ball Bearing | | Brand Name | LYJEE | | Compatible Lubricant | Grease | | Customer Reviews | 4.5 4.5 out of 5 stars (473) | | Item Thickness | 20.5 millimeters | | Item Weight | 26.3 g | | Manufacturer | Letool International Ltd. | | Material Type | High Carbon Steel | | Model | U0840-20 | | Outside Diameter | 40 millimeters | | Part Number | U0840-20 | ## Product Details - **Bearing Number:** 608ZZ - **Brand:** LYJEE - **Item Thickness:** 20.5 millimeters - **Item Weight:** 26.3 g - **Material:** High Carbon Steel ## Images ![Letool 4pcs U Type Groove Pulley Nylon Guide Pulley Rolling Bearing U Groove Roller Wheel 8x40x20mm for Driving Mechanical Equipment, or Used in Doors and Windows - Image 1](https://m.media-amazon.com/images/I/61zjJxzFKKL.jpg) ![Letool 4pcs U Type Groove Pulley Nylon Guide Pulley Rolling Bearing U Groove Roller Wheel 8x40x20mm for Driving Mechanical Equipment, or Used in Doors and Windows - Image 2](https://m.media-amazon.com/images/I/61i7ZMBUeNS.jpg) ![Letool 4pcs U Type Groove Pulley Nylon Guide Pulley Rolling Bearing U Groove Roller Wheel 8x40x20mm for Driving Mechanical Equipment, or Used in Doors and Windows - Image 3](https://m.media-amazon.com/images/I/71vNiX3nf4S.jpg) ![Letool 4pcs U Type Groove Pulley Nylon Guide Pulley Rolling Bearing U Groove Roller Wheel 8x40x20mm for Driving Mechanical Equipment, or Used in Doors and Windows - Image 4](https://m.media-amazon.com/images/I/619xCtJVdfS.jpg) ![Letool 4pcs U Type Groove Pulley Nylon Guide Pulley Rolling Bearing U Groove Roller Wheel 8x40x20mm for Driving Mechanical Equipment, or Used in Doors and Windows - Image 5](https://m.media-amazon.com/images/I/81Zn3cCjPCS.jpg) ## Questions & Answers **Q: Wanting to use for a children's sensory board. Would these work for wheels like for a car...etc. What kind of hardware to connect on board?** A: These are concave so more of a pulley than a car wheel. You would use ordinary 1/4 bolts to fasten. They are good quality and run very smoothly. **Q: Does anyone know the id of the black part? or in other words the od of the bearing? i am trying to find a spacer that will fit inside. thanks.** A: OD that is visible is 20mm ( 13/32" ). The rest of the race is embedded in the plastic. There is not enough outer race visible to put a spacer against it. I I used nylon spacers of 12mm ( 1/2" ) in diameter mated to the inner race on both sides of the bearing. A machine bolt fits nicely into the hole of the nylon spacer to mount it to whater you like. **Q: What load can these handle?** A: I do not know. They are very hefty. **Q: What's the inner diameter of the wheel where bearing sits** A: I don't have one to measure and the information in the Amazon listing only shows the inner diameter of the bearing, not the rubber groove. I suggest you contact the vendor through the Amazon link ## Frequently Bought Together - Letool 4pcs U Type Groove Pulley Nylon Guide Pulley Rolling Bearing U Groove Roller Wheel 8x40x20mm for Driving Mechanical Equipment, or Used in Doors and Windows - CNBTR 4Pieces 6x30x13mm Plastic Coated Sealed Bearings Steel 606ZZ Deep U Groove Guide Pulley Rail Ball Rolling Bearing Wheel Orange - 5Pcs Deep T Groove Flat Bottom Bearing, Stainless Steel Pulley Wheel for Wire Rope --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.gr/products/77801435-letool-4pcs-u-type-groove-pulley-nylon-guide-pulley-rolling](https://www.desertcart.gr/products/77801435-letool-4pcs-u-type-groove-pulley-nylon-guide-pulley-rolling) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-08-06*