Unifix Grade 12.9 Socket Shoulder Screws - 8mm (M6) X 20 - Box Of 50 - Silver
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This guide is for engineers, mechanics, and DIY enthusiasts requiring robust fastening solutions. The Unifix Grade 12.9 Socket Shoulder Screws offer superior strength and reliability for demanding applications. A potential caveat is the specific size (8mm M6) which may not suit all projects.
All features
| Colour | Silver |
|---|---|
| Model Part Number | 5014196363493 |
| Brand | Unifix |
Extended Product Information
FAQs
What does 'Grade 12.9' mean for these screws?
Grade 12.9 indicates a very high-strength alloy steel classification according to ISO 898-1 standards. It signifies excellent tensile strength and hardness, making these screws suitable for demanding applications.
What is the purpose of the 'shoulder' on a shoulder screw?
The shoulder provides a precise unthreaded bearing surface. It's used for locating parts, creating a pivot point, or ensuring a specific gap between components. It also prevents overtightening.
Are these screws suitable for outdoor use?
The silver finish offers some corrosion resistance, but they are not specifically rated for prolonged outdoor exposure in harsh conditions. For such applications, stainless steel or specially coated fasteners may be more appropriate.
Can I use these screws with an impact driver?
It is not recommended. Impact drivers can exert extreme, uncontrolled torque that may strip the socket head or damage the screw or the mating material. A manual hex wrench or a controlled torque driver is preferred.
What is ISO 7379?
ISO 7379 is an international standard that specifies dimensions and properties for shoulder screws. Compliance ensures the screw meets specific design and performance criteria.
How do I determine the correct length of shoulder screw needed?
The required length depends on the total thickness of the materials being joined and the desired shoulder protrusion. Ensure the threaded portion engages sufficiently with the mating thread or nut.
Troubleshooting
Screw head stripping during tightening.
Ensure you are using the correct size hex wrench. Apply steady, even pressure and avoid excessive force if resistance is met. Check that the mating threads are not cross-threaded or damaged.
Screw not tightening properly.
Verify that the mating thread or nut is indeed M6. Check for damaged threads in the hole or on the screw. Ensure the screw is long enough for the application.
Corrosion or rust appearing on the surface.
Wipe the screw clean with a dry cloth. For minor surface rust, a very light application of a rust inhibitor might help, but for severe corrosion, replacement is recommended. Store in a dry environment.
Pros and Cons
Pros
- Exceptional tensile strength for high-stress environments.
- Meets recognized ISO standards for reliability.
- Socket shoulder design offers precise assembly.
- Durable construction for long-term use.
- Suitable for both professional industrial use and advanced DIY projects.
Cons
- Specific M6 size limits general applicability.
- Grade 12.9 may be overkill for light-duty tasks.
- Requires appropriate tools (socket wrench) for installation.
- Sold in a fixed quantity (box of 50) which may be insufficient or excessive for some users.
Setup, Compatibility & Care
Setup:
- Select Appropriate Tool: Use a hex socket (Allen) wrench or a socket driver that correctly fits the `8mm (M6)` socket head.
- Thread Engagement: Ensure the mating thread or hole is clean and free of obstructions. For tapped holes, confirm the thread size and pitch are compatible with an M6 screw.
- Tightening: Apply gradual and consistent torque using the hex wrench. For critical applications, use a torque wrench set to the manufacturer's recommended value for Grade 12.9 M6 screws, considering the materials being joined.
Compatibility:
- Thread Size: Compatible with standard M6 tapped holes or nuts.
- Material Thickness: The shoulder length (typically specified separately or inherent to the application) should be considered for proper engagement.
- Environmental Factors: While the silver finish offers some corrosion resistance, avoid prolonged exposure to harsh chemicals or highly corrosive environments without additional protection.
Care:
- Storage: Store screws in their original packaging or a clean, dry container to prevent corrosion and damage to the socket head.
- Cleaning: If dust or debris accumulates, clean with a dry cloth. For stubborn dirt, use a cloth lightly dampened with water and dry immediately. Avoid abrasive cleaners.