DIN 916-45H / ISO 4029 Socket Set Screw Cup Point

DIN 916 / ISO 4029 — Socket Set Screw with Cup Point

Brand: FULLERKREG  |  Material: Alloy Steel ML40Cr  |  Grade: 45H / 12.9  |  Surface: Black Oxide

Product Overview

FULLERKREG DIN 916 / ISO 4029 Socket Set Screws with Cup Point are precision-engineered headless set screws designed for high-load, vibration-resistant clamping applications. The cup point geometry bites into the mating surface, providing superior holding power compared to flat or cone point variants — making them the preferred choice for shaft-to-hub locking, positioning, and anti-rotation applications across industrial machinery, automation equipment, and precision assemblies.

Standards & Specifications

• Standards: DIN 916 (1987), ISO 4029
• Thread Form: ISO Metric Coarse Thread (per ISO 68-1)
• Thread Tolerance: 5g6g (per ISO 965-1)
• Drive Type: Hexagon Socket (Allen / Hex Key)
• Point Type: Cup Point — concave spherical recess at tip
• Material: Alloy Steel ML40Cr 
• Strength Grade: 45H (equivalent to Grade 12.9 per ISO 898-1 / DIN 267-11)
• Hardness: HRC 45–53 (core hardness per DIN 267-11)
• Surface Treatment: Black Oxide (Blackening)
• Applicable Standard for Mechanical Properties: ISO 898-1, DIN 267-11

Material & Mechanical Properties

Note: Grade 45H is the set screw-specific designation under DIN 267-11, corresponding to the 12.9 strength class under ISO 898-1 for full-body fasteners.

Dimensional Range

Custom lengths and special thread pitches available upon request. Contact FULLERKREG for non-standard configurations.

Cup Point Geometry

The cup point (concave spherical recess) is the defining feature of DIN 916 / ISO 4029 set screws. Key functional advantages:

• High holding force: The rim of the cup bites into the shaft surface, creating a positive mechanical lock.
• Minimal shaft damage: The concave geometry distributes contact stress more evenly than cone or dog points, reducing shaft marring.
• Vibration resistance: Excellent resistance to loosening under dynamic and cyclic loads.
• Repositionable: Allows limited repositioning without severe shaft damage, unlike knurled or serrated points.
• Versatile: Suitable for both hardened and unhardened shafts.

Typical Applications

• Shaft-to-hub locking (pulleys, gears, sprockets, couplings, collars)
• Anti-rotation and positioning of components on shafts
• Clamping of sleeves, bushings, and bearing housings
• Machine tool spindles and precision positioning fixtures
• Automation and robotics assemblies
• Conveyor and drive systems
• Hydraulic and pneumatic valve assemblies
• General industrial machinery and equipment

Installation Guidelines

• Use the correct hex key (Allen wrench) matching the socket size — refer to the dimensional table above.
• Ensure the shaft and bore are clean and free of oil or debris before installation.
• Apply thread-locking compound (e.g., Loctite 243) for vibration-critical applications.
• Tighten to the recommended torque for the thread size and grade (refer to ISO 898-1 torque tables).
• For hardened shafts, ensure shaft hardness is lower than the set screw tip hardness (HRC 45–53) to ensure proper bite.
• Do not exceed the rated tightening torque to avoid socket strip-out or screw fracture.

Quality Assurance

• Dimensional Inspection: 100% thread gauge inspection per ISO 965-1 (5g6g tolerance)
• Hardness Testing: Rockwell hardness test per DIN 267-11 (HRC 45–53)
• Tensile / Proof Load Testing: Per ISO 898-1 (Grade 12.9 / 45H)
• Salt Spray Test: Black oxide surface corrosion resistance verification
• Socket Torque Test: Drive socket integrity verification
• Lot Traceability: Full material and process traceability per batch

Packaging Options

• Bulk (polybag or carton) — standard for wholesale orders
• Small box (labeled, per size) — available for mixed or sample orders
• Custom packaging — available for OEM and private-label customers

Ordering Information

• Price: Unit price per piece (USD), not per thousand. Contact us for volume pricing.
• Customer Base: B2B wholesale only. We do not serve retail / B2C customers.
• Order Method: All orders are placed offline. Online prices are for reference and inquiry only. Please contact us via email to place orders.
• MOQ: Varies by size — contact FULLERKREG for minimum order quantities.
• Lead Time (Small Batch): Approx. 30 days, delivered DDP.
• Lead Time (Large Volume): FOB Shanghai; other Incoterms negotiable.
• Custom Orders: Non-standard lengths, special coatings, or OEM requirements available upon request.

Frequently Asked Questions

Q: What is the difference between DIN 916 and ISO 4029?
A: DIN 916 is the German standard; ISO 4029 is the international equivalent. Both specify the same cup point set screw geometry and are dimensionally interchangeable. FULLERKREG products comply with both standards.

Q: What does grade 45H mean?
A: 45H is the set screw-specific strength designation per DIN 267-11, indicating a minimum surface hardness of HRC 45 and a maximum of HRC 53. It is functionally equivalent to Grade 12.9 for full-body fasteners under ISO 898-1.

Q: Is Black Oxide a corrosion-resistant coating?
A: Black oxide provides mild corrosion resistance and reduces light reflection. For harsh environments, additional oil or wax treatment is recommended. For high-corrosion environments, please contact us for alternative surface options.

Q: Can these set screws be used on stainless steel shafts?
A: Yes. The high surface hardness (HRC 45–53) of the cup point allows effective engagement with most shaft materials including mild steel, alloy steel, and stainless steel.

Q: Do you offer custom lengths or thread pitches?
A: Yes. FULLERKREG can produce non-standard configurations. Please contact us with your technical requirements.