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Metric Socket Set Screws

Understanding Metric Socket Set Screws

Metric socket set screws are used in a variety of applications, including door handles, light fixtures, bathroom fixtures, and electronic products. These set screws are available in different types, such as flat point, cone point, dog point, and cup point. With each type serving their own specific purposes. When selecting the appropriate metric socket set screws, it is essential to consider factors like load-bearing capacity, material compatibility, and environmental conditions. The size of a metric set screw is typically measured in millimeters (mm). In general, it is crucial to match the screw size with the appropriate pilot hole size to prevent material damage and ensure the integrity of the connection.

What Are Metric Socket Set Screws?

Metric socket set screws, which are often referred to as grub screws, are a type of fastener that typically do not have a head projecting beyond the major diameter of the screw. Instead, they are fully threaded along their body and are designed to be driven using a hex (Allen) key or wrench via a recessed hexagonal socket in one end. These screws are used in mechanical assemblies to securely fasten an object within or against another object, without the use of a protruding head.

Standards

Metric socket set screws are manufactured to standards such as:

  • ISO 4026–4029
  • DIN 913–916

Each standard defines different point styles and dimensional tolerances.

Key Features

Here are some of the key features for metric socket set screws.

  • Head Type: No external head (headless). Driven with a hex socket.
  • Thread Type: Metric threads (e.g., M3, M4, M5, etc.).
  • Drive Type: Internal hex drive (Allen key).

4 Common Uses

Here are four common uses for metric socket set screws.

  1. Secure pulleys, gears, and collars to shafts.
  2. Prevent relative movement between two rotating parts.
  3. Provide adjustable force in assemblies.
  4. Temporarily fasten parts in place for adjustment.

About Point Types for Metric Socket Set Screws

  • Cup point: This is the most common type as it offers good holding power.
  • Flat point: For frequent adjustments and minimal damage to mating part.
  • Cone point: Use for permanent setting, since it digs into the shaft.
  • Dog point: Has a cylindrical end, which fits into a hole in the mating part.
  • Knurled cup point: Offers enhanced grip for high-vibration applications.

Materials & Finishes

Metric socket set screws come in various materials and finishes, such as:

  • Steel (hardened alloy or carbon steel)
  • Stainless steel (304, 316 for corrosion resistance)
  • Brass or nylon tips for applications where surface protection is critical
  • Common finishes include:
  • Black oxide
  • Zinc plating
  • Plain (uncoated)

FAQs About Metric Socket Set Screws

What are different types of metric set screws?

There are several types of metric set screws, including Flat Point, Cone Point, Dog Point, Cup Point, Knurled, Nylon Tip, and Brass Tip.

What are the standard sizes for metric set screws?

The standard sizes for metric set screws generally range from M1.6 to M24, with the number indicating the diameter of the screw in millimeters.

How do I measure the size of a metric set screw?

You can use a digital caliper to measure the diameter and length of a metric set screw accurately. Refer to conversion charts to find the equivalent size if needed.

Contact Sesco for More About Metric Socket Set Screws

Sesco Industries is a nationwide aerospace parts distributor, which includes the supplying of metric socket set screws. Are you looking for metric socket set screws for aerospace applications? The please request a quote today.

Request a Quote!

When you reach out to us, we can go over the specifications of these metric socket set screws with you. Upon your request, full certifications are provided at no charge. These certifications assure our customers they can bid on our aerospace parts without hesitation. We are fully approved by the Defense Logistics Agency of Philadelphia, PA to be on the QSLM list.

Common Types of Metric Socket Set Screws

Here are some common types of metric socket set screws.

Grub Screw Set

Grub screws, also known as set screws, are used to secure an object within or to another object. They are often used in door handles, light fixtures, and bathroom fixtures.

Grub screws come in various sizes, with M3, M4, M5, M6, and M8 being some of the most common metric sizes. They can also be classified by their head type, which can be flat, cone, dog, or cup-shaped, among others. The length and thread type also vary among grub screws.

When choosing a grub screw, it is important to consider the specific application and select the appropriate size and material. For example, for outdoor applications, it is recommended to use stainless steel or coated fasteners to prevent corrosion.

Allen Head Socket Hex Grub Set Screws

There are three different types that fall under this category and those are:

  1. ISO Standard for Hex Socket Set Screws: The ISO 4026 standard specifies hexagon socket set screws with flat points and threads ranging from M1.6 to M24, with a product grade of A. This standard ensures uniformity and compatibility in the manufacturing and use of these screws.
  2. SAE Standard Allen Head Socket Hex Grub Screws: SAE Allen Head Socket Hex Grub Screws are available in various sizes, such as the 440-piece kit that includes sizes from #4-40 to 1/4"-20.
  3. Metric Standard Allen Head Socket Hex Grub Screws: Metric Allen Head Socket Hex Grub Screws are also available in kits with multiple sizes.