PROFESSIONAL MANUFACTURER OF HARDWARE PRODUCTS
Jinan Meierde Industry Co., Ltd
Countersunk Hexagon Socket Bolt Product Description
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Product introduction
Product Overview
Countersunk hexagon socket bolts, also referred to as flat-head socket cap screws, are fasteners with a conical head and an internal hexagonal drive. The 90° countersunk head design allows the bolt to sit flush with or slightly below the mating surface, creating a smooth, snag-free assembly.
Key Features
- Internal hexagon socket drive provides high torque transfer and reduces cam-out risk
- 90° flat countersunk head enables flush installation
- Precision-formed threads for consistent fit and reliable clamping
- Available in multiple strength grades and materials
- Corrosion-resistant surface finishes available
- Easy to install and remove with standard hex keys or bits
Materials and Strength Grades
| Material | Strength/Property Class | Common Surface Finish |
|---|---|---|
| Carbon steel | 8.8, 10.9, 12.9 | Black oxide, zinc plating, zinc-nickel |
| Stainless steel | A2-70, A4-80 | Passivated |
| Brass | Not strength graded | Plain, nickel plated |
| Titanium alloy | Grade 5 | Polished or anodized |
Dimensional Standards
- Metric: ISO 10642 / DIN 7991, M3 through M20
- Inch: ASME B18.3, #4-40 through 3/4-10
- Thread types: metric coarse, metric fine, UNC, UNF
- Standard head angle: 90°
- Drive type: hexagon socket per ISO 4762 or ASME B18.3
Recommended Torque Guidance
The following values are approximate for property class 10.9 steel bolts under unlubricated conditions.
| Nominal Diameter | Standard Pitch | Approximate Torque Range |
|---|---|---|
| M4 | 0.7 mm | 2.5–3.5 N·m |
| M5 | 0.8 mm | 5–7 N·m |
| M6 | 1.0 mm | 9–12 N·m |
| M8 | 1.25 mm | 22–28 N·m |
| M10 | 1.5 mm | 43–55 N·m |
Typical Applications
- Machine guards and access panels
- Automotive interior and chassis components
- Furniture and cabinet assembly
- Electronic enclosures and control cabinets
- Sheet metal housings
- Molds, dies, and fixture plates
- Aerospace and precision equipment
Installation Notes
- Verify that the countersink angle of the mating hole matches the fastener head angle.
- Use properly sized hex keys or driver bits to avoid damaging the socket.
- Apply the specified tightening torque for high-strength joints.
- For stainless steel fasteners, use controlled assembly speed or anti-seize lubricant to reduce galling risk.
Packaging and Quality
- Bulk cartons, poly bags, or labeled small boxes
- Optional plating certificates and material test reports
- Dimensional inspection and batch traceability available
Product message
Jinan Western Industrial park, Jinan City, Shandong Province
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