---
product_id: 72755942
title: "2 Pack M8 x 40mm (5/16\" x 1-5/8\") Thread Replacement Star Hand Knob Tightening Screw"
brand: "kasteco"
price: "$81090"
currency: COP
in_stock: true
reviews_count: 8
category: "Kasteco"
url: https://www.desertcart.co/products/72755942-2-pack-m8-x-40mm-5-16-x-1-5
store_origin: CO
region: Colombia
---

# M8 x 40mm precision fit Alloy steel + durable plastic combo Fully threaded for max grip 2 Pack M8 x 40mm (5/16" x 1-5/8") Thread Replacement Star Hand Knob Tightening Screw

**Brand:** kasteco
**Price:** $81090
**Availability:** ✅ In Stock

## Summary

> 🔧 Upgrade your gear with screws that mean business!

## Quick Answers

- **What is this?** 2 Pack M8 x 40mm (5/16" x 1-5/8") Thread Replacement Star Hand Knob Tightening Screw by kasteco
- **How much does it cost?** $81090 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co](https://www.desertcart.co/products/72755942-2-pack-m8-x-40mm-5-16-x-1-5)

## Best For

- kasteco enthusiasts

## Why This Product

- Trusted kasteco brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Value Pack of Two:** Double the reliability with two premium hand knob screws—because one just isn’t enough.
- • **Fully Threaded Length:** 40mm of continuous threading ensures a secure, vibration-resistant hold every time.
- • **Precision M8 Threading:** Engineered for a perfect 8mm diameter and 1.25mm pitch—seamless compatibility with your gear.
- • **Versatile Industrial Use:** Ideal for mechanical, pharmaceutical, and food equipment—upgrade your setup with confidence.
- • **Durable Alloy Steel & Plastic Build:** Combines strength and lightweight design for long-lasting, rust-resistant performance.

## Overview

This 2-pack of M8 x 40mm hand knob tightening screws features fully threaded alloy steel shafts with durable plastic knobs, designed for precision fit and maximum grip. Perfect for mechanical and industrial applications, these screws offer superior strength and corrosion resistance compared to standard plastic fasteners.

## Description

Specifications: Material:Metal + Plastic Color:Silver Tone, Black Package includes: 2 x hand knob tightening screw

Review: Fixed my canopy - This fixed my canopy swing. These are much better quality than the ones the swing came with which were plastic. The size was a fit and priced well! These screws will hold up more than the plastic.
Review: Game changer!! - This was a game changer. I ordered this use on my adjustable pool basketball hoop. It was perfect!!

## Features

- Screw size: M8-1.25 x 40mm (5/16"-24 x 1-5/8")，The thread diameter is 8mm, the pitch is 1.25mm, and the length is 40mm.
- Note: Please check the size before purchasing.
- Package included: 2 x hand knob tightening screw,M8 x 40mm (5/16" x 1-5/8")
- Material: Metal + Plastic
- Widely used for mechanical equipment, instruments, apparatus, food and pharmaceutical industry equipment.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07DLRRB3Z |
| Best Sellers Rank | #104,122 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #619 in Cabinet & Furniture Knobs |
| Brand | Kasteco |
| Color | Silver |
| Compatible groove diameter | 8 Millimeters |
| Date First Available | June 8, 2018 |
| Exterior Finish | Black Oxide |
| Fastener Size | M8 |
| Fastener Type | Machine Screw |
| Head Style | Flat |
| Head Type | Hex |
| Is Discontinued By Manufacturer | No |
| Item Diameter | 8 Millimeters |
| Item Weight | 0.01 ounces |
| Item model number | 2fdaa9b5-2fd1-4c92-a813-b552839cc870 |
| Manufacturer | KTZZ |
| Material | Plastics and Metals |
| Metal Type | Alloy Steel |
| Number of Pieces | 2 |
| Point Style | Round Point |
| Set Name | 2 Pack |
| Set Screw Thread Type | Metric |
| Size | 40mm |
| Thread Coverage | Fully Threaded |
| Thread Size | M8 |
| UPC | 675663909047 |

## Product Details

- **Exterior Finish:** Black Oxide
- **Head Style:** Flat
- **Item dimensions L x W x H:** 1.52 x 0.87 x 0.04 inches
- **Material:** Plastics and Metals
- **Thread Size:** M8

## Images

![2 Pack M8 x 40mm (5/16" x 1-5/8") Thread Replacement Star Hand Knob Tightening Screw - Image 1](https://m.media-amazon.com/images/I/61fCp5TL50L.jpg)
![2 Pack M8 x 40mm (5/16" x 1-5/8") Thread Replacement Star Hand Knob Tightening Screw - Image 2](https://m.media-amazon.com/images/I/51678tHtx5L.jpg)
![2 Pack M8 x 40mm (5/16" x 1-5/8") Thread Replacement Star Hand Knob Tightening Screw - Image 3](https://m.media-amazon.com/images/I/71aZlMT5gEL.jpg)
![2 Pack M8 x 40mm (5/16" x 1-5/8") Thread Replacement Star Hand Knob Tightening Screw - Image 4](https://m.media-amazon.com/images/I/71jVHEl0f6L.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Does this fit the willow springs swing canopy? 20 or 40mm.**
A: Not sure the thread pitch of your project, M8 equals the bolt diameter, 20mm/40mm is the length of the bolt, 20mm = about 3/4", 40mm = about 1.5". You still need to know what the " pitch of the thread" is. Metric  threads are made in different "pitchs" Ex: 1.00, 1.25 pitch. Doesn't say the pitch of the bolt in the Amazon Offer.  Best to take your bolt to a hardware store and try  different metric nuts on it to find what the "Pitch" is, then look on Amazon to find a match.

**Q: M8x1.0 or M8x1.25?**
A: M8 x 1.25

**Q: Will this fit the DB method exercise machine?**
A: As long as the nut is a M8 x 40 mm

**Q: Do you offer an M6 x 40 in 304 stainless?**
A: no, thank you

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fixed my canopy
*by A***Y on November 5, 2025*

This fixed my canopy swing. These are much better quality than the ones the swing came with which were plastic. The size was a fit and priced well! These screws will hold up more than the plastic.

### ⭐⭐⭐⭐⭐ Game changer!!
*by J***5 on October 27, 2025*

This was a game changer. I ordered this use on my adjustable pool basketball hoop. It was perfect!!

### ⭐⭐⭐⭐⭐ Perfect fit
*by M***L on June 19, 2025*

Thread was perfect for what I needed it for

## Frequently Bought Together

- Kasteco 2 Pack Black 8mm(M8) x 40mm Thread Replacement Star Hand Knob Tightening Screw
- BSWAN 4 Pack M8 x 25mmThread Replacement Star Hand Knob Tightening Screw for Umbrella Base Replacement (4 Pack)
- LifCratms 6 Pieces M6 x 40mm Thread Star Knobs, Plastic Hex Shaped Clamping Knob Handle Hand Tightening Screw Knob for Umbrella Base Replacement

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*Product available on Desertcart Colombia*
*Store origin: CO*
*Last updated: 2026-02-21*