Steel Ultra short head bolt (hexagon socket hole type)

Name: Alloy Steel Low-Profile Socket Head Screws

1. Alloy Steel Low-Profile Socket Head Screws. Made of alloy steel, these low-profile screws are nearly twice as strong as their stainless steel counterparts. With half the height of a standard socket head, these low-profile screws fit in tight spaces but are weaker than standard socket heads. Length is measured from under the head.

Black-oxide steel screws are mildly corrosion-resistant in dry environments. Zinc-plated steel screws have a zinc outer layer that protects the steel under them from rust, extending the life of the screw. Class 8.8 steel screws are medium-strength, so they’re strong enough for use with most machinery and equipment. Class 10.9 steel screws are high-strength—they are at least 25% stronger than Class 8.8. Use them for high-stress applications such as valves, pumps, and automotive suspensions.

Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch. Fine threads are closely spaced to prevent loosening from vibration. They are not compatible with coarse threads. Screws that meet ASTM A574 comply with specifications and testing requirements for material quality.

DIN screws meet international standards for materials and dimensions. Tighten DIN 6912 screws with DIN 6911 L-keys—these screws have a recess that matches the extended tip of those L-keys. DIN 6911 L-keys grip these screws snugly so you can install them in difficult-to-reach areas with just one hand. You can also install DIN 6912 screws with standard L-keys, but they won’t grip the screws as securely.

2. Stainless Steel Low-Profile Socket Head Screws. Nearly as strong as steel, these stainless steel screws won’t rust in outdoor, washdown, and other corrosive environments. With half the height of a standard socket head, these low-profile screws fit in tight spaces but are weaker than standard socket heads. Length is measured from under the head. Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch. Fine threads are closely spaced to prevent loosening from vibration. They are not compatible with coarse threads.DIN screws meet international standards for materials and dimensions. Tighten DIN 6912 screws with DIN 6911 L-keys—these screws have a recess that matches the extended tip of those L-keys. DIN 6911 L-keys grip these screws snugly so you can install them in difficult-to-reach areas with just one hand. You can also install DIN 6912 screws with standard L-keys, but they won’t grip the screws as securely.

3. Super-Corrosion-Resistant 316 Stainless Steel Low-Profile Socket Head Screws. More corrosion resistant than 18-8 stainless steel screws, these 316 stainless steel screws have excellent resistance to chemicals and salt water. They may be mildly magnetic. With half the head height of a standard socket head, they fit where space is limited, but their low profile makes their head weaker. Not recommended for critical fastening applications. Length is measured from under the head. Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch. Fine threads are closely spaced to prevent loosening from vibration. They are not compatible with coarse threads. Screws that meet DIN 7984 comply with specifications for dimensional standards.

Size Can also be According to the Customer's requirement for manufacturing, please check the detailed specification sheet details PDF, CAD, 193-194 Page See more product details.

Packaging: The inner packaging is a plastic bag, and the outer packaging is a carton. Then the tray. Carton size: 29*19*19.5cm and 23.5*17.5*8 cm and pallet size: 215*100*90 cm, or as your request.