1139548 FASTENAL Hex Oxide Alloy Steel Socket Head Cap Screw

Review FASTENAL 25mm 4mm Hex 12.9 Bl Oxide Alloy Steel Socket Head Cap Screw Qty 50

Introducing the Fastenal Part Number 1139548, an essential M5-0.8 x 25mm socket head cap screw made of 12.9 oxide alloy steel. This screw is designed with a hexagonal head having a 4mm interface, which enables it to be securely tightened using a hexagonal socket or wrench. The screw's thread pitch measures 0.8mm, making it suitable for various applications where a medium thread count is required.

Manufactured from 12.9 oxide alloy steel, this screw possesses excellent tensile strength and resistance to corrosion. The oxide coating is applied to enhance the screw's protective qualities, ensuring its durability and longevity in harsh environments. The M5-0.8 x 25mm size designates a nominal diameter of 5mm and a thread length of 25mm, making it an ideal choice for various applications where a medium-sized screw with a decent thread length is required.

This socket head cap screw features a recessed head, creating a flush surface when installed, which is aesthetically pleasing and beneficial for applications where the head of the screw needs to be concealed. The hexagonal socket head design also provides additional torque transfer, ensuring a secure and reliable fastening solution.

The Fastenal Part Number 1139548 is a versatile and indispensable component for various industries, including automotive, construction, and manufacturing. Its robust strength, resistance to corrosion, and secure fastening capabilities make it a valuable addition to any project or repair.

In summary, the Fastenal Part Number 1139548 is a high-quality M5-0.8 x 25mm socket head cap screw made of 12.9 oxide alloy steel. Its hexagonal head with a 4mm interface, oxide coating, and recessed design make it a durable, reliable, and versatile fastening solution for various applications.

Fastenal part number 1139548 is for M5-0.8 x 25mm, 4mm hex, 12.9 oxide alloy steel socket head cap screws. Here are some potential pros and cons of buying these screws:

1. High-strength: The 12.9 oxide alloy steel material provides a high tensile strength, making these screws suitable for applications that require a strong hold.

2. Corrosion resistance: The oxide coating on these screws helps to prevent rust and corrosion, which can be beneficial in harsh environments where the screws may be exposed to moisture or chemicals.

3. Standard size: These screws conform to a common size and thread pitch, making them easily interchangeable with other M5 screws and compatible with a wide range of hardware.

4. Availability: Fastenal is a leading supplier of industrial and construction fasteners, and their extensive inventory ensures that these screws are readily available for purchase.

1. Cost: Compared to other types of screws, these high-strength, corrosion-resistant screws may be more expensive.

2. Limited applications: While these screws are suitable for many applications, they may not be the best choice for applications that require a larger thread size or a different type of head.

3. Hand-tightening only: The 4mm hex head is designed for use with a socket wrench or other torque-controlled tool. These screws cannot be tightened by hand to the recommended torque specification.

In conclusion, Fastenal part number 1139548 M5-0.8 x 25mm, 4mm hex, 12.9 oxide alloy steel socket head cap screws offer high strength and corrosion resistance, but they may be more expensive than other types of screws and are not suitable for applications that require a larger thread size or a different type of head. If you need screws for an application that requires a high tensile strength and corrosion resistance, and you have the necessary tools to install them, these screws may be a good choice. Otherwise, you may want to consider alternative options that better meet your specific requirements.

Details:

Socket head cap screws supply greater tensile strength than equivalent hex caps screws, while requiring less surface area to counter bore. With pilot hole / without. M5-0.8 x 25mm l 4mm hex drive class 12.9 black oxide alloy steel socket head cap screw. Socket head cap screws are ideal for precision work with close tolerances and applications needing a well tooled appearance.

specifications buildymat:

• brand: Fastenal
• mpn: 1139548
• part type: Socket Head Cap Screw

general buildymat:

• category: Business & Industrial > Supplies > Building Materials

shipping buildymat:

• service: standard
• transit: 3-6 days
• type: fixed
• class: standard

offer buildymat:

• availability: in stock
• in stock #: 5
• prices: $7.89–$22.46
• item condition:
  • New
  • New – Open box
• options: ship-to-home
• sold #: 10
• started: january 23, 2026

returns buildymat:

• method: money back
• policy: returns accepted
• paid by: seller
• time: 30 days

payments buildymat:

• money order
• wallet: apple-pay
• credit card: diners-club
• other

seller buildymat:

• rating: 99.7%
• city: winona, minnesota
• # reviews: 23200