Slotted Set Screw Flat Point(DIN 551)
IN 551 Slotted Flat Point Set Screws (Slotted Grub Screws)
What is DIN 551?
DIN 551 specifies slotted, headless set screws (grub screws) with a flat point at the threaded end. Designed to sit flush within an assembly, they are used to secure one component within or against another. The flat tip distributes clamping force evenly over a wider surface area, reducing the risk of marring or denting the contact surface. This makes them suitable for applications requiring frequent repositioning, such as in jigs and fixtures.
A key characteristic is their simple slotted drive. As this design offers only two contact points for a screwdriver, it cannot transmit high torque and is best suited for manual, hand-tightening.
ISO Equivalent
The functionally equivalent international standard is ISO 4766.
Material Comparison: Brass, Alloy Steel, or Stainless Steel?
The choice of material depends on the specific requirements of your application. Below is a comparison of the key properties:
| Material | Key Characteristics | Best For | Considerations |
| Brass | Non-magnetic, electrically conductive, softer metal. | Electrical applications, use with delicate components to prevent scratching. | Softer than steel; lower mechanical strength and wear resistance. |
| Alloy Steel | High mechanical strength and durability. | Applications requiring a strong, durable fastener for secure clamping. | Requires plating or coating for corrosion resistance in most environments. |
| Stainless Steel (18-8/A2) | Good corrosion resistance, non-magnetic (in the annealed state). | General use in damp or outdoor environments where rust resistance is needed. | Lower strength than alloy steel; not suitable for highly corrosive chemicals. |
| Stainless Steel (316/A4) | Excellent corrosion resistance, including against many chemicals. | Harsh environments, including marine and chemical exposure. | Lower strength than alloy steel; premium price. |
Download DIN 551 Dimensions pdf and DIN 551 Weight Chart or views online
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Active Stock List (All items are currently in stock)：
| PIC | PRODUCT | SIZE | GRADE | FINISH | THREAD |
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DIN 551 Slotted Set Screw Flat Point -A2 Stainless | M1.6 to M12 | A2 Grade | Natural | Coarse |
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DIN 551 Slotted Set Screw Flat Point -A4 Stainless | M1.6 to M12 | A4 Grade | Natural | Coarse |
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DIN 551 Slotted Set Screw Flat Point -Brass | M1.6 to M12 | Soft | Conductive, Corrosion Resistant, Nonmagnetic, Nonmarring | Coarse |
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DIN 551 Slotted Set Screw Flat Point -Alloy Steel | M1.6 to M12 | Rockwell B67 | Black | Coarse |