Overview
ISO 4027:2026 defines the requirements for fasteners in the form of hexagon socket set screws with a truncated cone point. These specialized set screws feature metric coarse pitch threads and are manufactured for both steel and stainless steel materials. The standard covers thread sizes from M1.6 up to M30 for steel, and M1.6 up to M24 for stainless steel, all within product grade A. Hexagon socket set screws with truncated cone points are commonly used for non-tensile, securing applications where precise adjustability, reliable holding power, and a flush finish are required.
Key Topics
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Thread Sizes and Materials
- Steel: Metric threads M1.6 to M30
- Stainless steel: Metric threads M1.6 to M24
- Coarse pitch threads for secure fitting
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Product Grades and Hardness
- Grade A for high-quality precision
- Hardness classes and stainless steel grades as per ISO 898-5 and ISO 3506-3
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Design Features
- Truncated cone point allows for firm contact without damaging surfaces
- Hexagon socket facilitates installation with Allen (hex) keys
- Available in various lengths in accordance with ISO 888
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Marking & Labelling
- Product marking is optional unless specified
- Packaging must be clearly labelled with relevant standard reference, dimensions, material, hardness, surface condition, manufacturer information, lot number, and quantity
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Surface Condition and Acceptance
- Delivered as processed (steel) or clean and bright (stainless steel)
- Coating and passivation options available per ISO standards
- Acceptance inspection per ISO 3269
Applications
Hexagon socket set screws with truncated cone points (ISO 4027 type) are vital in a variety of mechanical applications. Their main purpose is to fasten components securely in position, particularly where tensile loads are not present.
Related Standards
To ensure full compliance and interoperability, ISO 4027:2026 references several key international standards:
- ISO 898-5: Mechanical properties for steel set screws
- ISO 3506-3: Mechanical properties for corrosion-resistant stainless steel set screws
- ISO 888: Fasteners - Nominal lengths and thread lengths
- ISO 965-1: Tolerances for ISO metric screw threads
- ISO 4753: Ends of parts with external ISO metric thread
- ISO 225 & ISO 724: Screw thread symbols, descriptions, and dimensions
- ISO 4042: Electroplated coating systems for fasteners
- ISO 10683: Non-electrolytically applied zinc flake coating systems
- ISO 6157-1: Surface discontinuities in fasteners
- ISO 8991 & ISO 8992: Designation and general requirements for fasteners
For specific application environments or additional requirements, such as alternative materials or special finishes, consult the referenced ISO standards for complete technical guidance.
By utilizing ISO 4027:2026 for hexagon socket set screws with truncated cone point, engineers and manufacturers ensure reliable, standardized fastening solutions that improve assembly quality and maintain compatibility in global markets. This standard is essential for organizations seeking precision, safety, and repeatability in critical mechanical fastening applications.