# computer case screw

> standard-sized screw for attaching components in a computer chassis

**Wikidata**: [Q2855821](https://www.wikidata.org/wiki/Q2855821)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Computer_case_screws)  
**Source**: https://4ort.xyz/entity/computer-case-screw

## Summary  
A computer case screw is a standard-sized fastener used to secure components like drives, motherboards, and fans within a computer chassis. As a de facto standard in the industry, it ensures compatibility and ease of installation across diverse hardware. These screws are integral to the physical assembly of computers, enabling modular and tool-free upgrades.  

## Key Facts  
- **Classification**: Subclass of *screw* and *computer hardware*; instance of *de facto standard*.  
- **Primary Use**: Attaching internal components (e.g., drives, motherboards) to a computer case.  
- **Aliases**: Case screw, PC screw, Tornillos de caja de PC.  
- **Standardization**: Adheres to industry-wide threading and drive-type specifications.  
- **Inclusion**: Typically provided with computer cases or components (e.g., SSDs, HDDs).  
- **Wikipedia Coverage**: Documented in English, Spanish, French, and Chinese.  
- **Sitelink Count**: 4 (as per Wikidata).  
- **Critical Role**: Prevents damage from improper fasteners (e.g., over-tightening with non-standard screws).  

## FAQs  
### Q: What size are computer case screws?  
A: Computer case screws follow standardized threading (e.g., M3 or #6-32) and lengths (commonly 4–10 mm), ensuring universal compatibility with most PC components.  

### Q: Why are computer case screws important?  
A: They standardize hardware installation, reduce risk of stripping or damaging components, and simplify repairs or upgrades by eliminating guesswork in fastener selection.  

### Q: Can I use regular screws instead of computer case screws?  
A: No—using non-standard screws (e.g., incorrect thread type or length) may damage components, strip threads, or compromise the chassis’s structural integrity.  

## Why It Matters  
Computer case screws are foundational to the modularity and repairability of modern PCs. By establishing a universal fastening system, they reduce manufacturing complexity, lower costs, and empower users to customize or repair devices without specialized tools. Their standardization reflects the broader ethos of interoperability in computing hardware, ensuring that components from disparate manufacturers work seamlessly together. This humble component directly supports the DIY ethos of PC building and the global e-waste reduction effort by extending hardware lifespans through easy upgrades.  

## Notable For  
- **De Facto Standardization**: Universally adopted across the computing industry without formal governance.  
- **Cross-Head Design**: Typically uses Phillips or Pozidriv heads for tool-free installation with a #1 or #2 screwdriver.  
- **Pre-Installed or Bundled**: Often included with cases, drives, or motherboards to ensure user convenience.  
- **Material Consistency**: Usually made of steel or zinc-plated steel to balance durability and cost.  

## Body  
### Definition and Purpose  
A computer case screw is a specialized fastener designed for assembling and securing components within a computer chassis. Its primary role is to anchor devices such as hard drives, solid-state drives (SSDs), motherboards, and fans to the case using standardized threading and drive types.  

### Specifications  
- **Thread Type**: Common standards include M3 (metric) or #6-32 (imperial).  
- **Drive Type**: Phillips (#1 or #2) or hex (for standoffs).  
- **Length**: Typically 4–10 mm, depending on application (e.g., drive mounts vs. motherboard standoffs).  
- **Material**: Steel or zinc-plated steel for corrosion resistance.  

### Role in Computer Hardware  
- **Compatibility**: Ensures seamless integration of components from different manufacturers.  
- **Safety**: Prevents over-tightening damage via controlled thread torque.  
- **Tooling**: Designed for hand-tightening with basic screwdrivers, avoiding the need for specialized tools.  

### Variations and Compatibility  
- **Standoffs**: Specialized screws with integrated spacers to elevate motherboards from the case.  
- **Thumb Screws**: Feature enlarged heads for tool-free adjustment (common in drive bays).  
- **Captive Screws**: Designed to remain attached to the case, reducing loss during maintenance.  

### Visual Identification  
![Computer case screws](https://commons.wikimedia.org/wiki/Special:FilePath/PC_Screws.jpg)  
*Several common types of screws used in desktop computers, illustrating standard drive types and lengths.*  

### Historical Context  
While not tied to a specific invention date, computer case screws emerged alongside the standardization of ATX cases in the mid-1990s, formalizing ad-hoc fastening practices into industry norms. Their evolution reflects advancements in PC design, such as the shift to tool-less drive bays in the 2000s.  

### Best Practices  
- **Replacement**: Use only screws matching the original thread and length to avoid damaging threads or stripping heads.  
- **Torque**: Tighten firmly by hand—over-tightening can warp plastic or metal components.  
- **Storage**: Retain spare screws from component packaging for future upgrades.