U-bolt | M8 | A2 | WS 9440

If you are looking for a U-bolt capable of direct anchoring and suspension in demanding environments without rusting, this is a reliable choice. The WS 9440 is manufactured from A2 / AISI 304 stainless steel and corresponds to DIN 3570 Form A in design. The construction is developed to withstand moisture, water, and moderately aggressive environments. Used where durability and corrosion resistance are crucial – especially in industrial environments, outdoor installations, and ventilation systems.

NOTE! The design is adapted for pipe dimensions according to NPS (Nominal Pipe Size), where the size is indicated in inches but does not correspond exactly to the outer diameter. U-bolts are therefore specified in inches based on pipe dimension, not actual bolt width. See the size chart for exact measurements.

FIELD OF APPLICATION

WS9440 is intended for fastening, anchoring, and suspending pipes, cable ladders, antennas, or other equipment against flat or round surfaces in environments such as outdoors, industries, workshops, or technical spaces. The design with threaded ends and included nuts provides a secure and adjustable anchorage. The product is easily installed using a socket or fixed wrench over the hexagonal nuts. When mounting over pipes or profiles, a suitable saddle is often used as a spacer for better force distribution and protection against deformation.

TECHNICAL SPECIFICATIONS

• Product type: U-bolt
• Designation: WS9440 (corresponds to DIN 3570 Form A)
• Quality: A2 / AISI 304 stainless steel
• Material grade: Not specified
• Thread type: Metric
• Surface treatment: Untreated (natural stainless steel)
• Head shape: U-shape with threaded ends
• Grip type: Not applicable

FREQUENTLY ASKED QUESTIONS (FAQ)

What does it mean that the U-bolt complies with the WS 9440 and DIN 3570 Form A standards?

WS 9440 indicates the factory-standardized measurement norm for stainless U-bolts that geometrically and functionally corresponds to DIN 3570 Form A:

• Standardized thread length and leg spacing: Guarantee of a correct fit around cylindrical objects such as pipes, beams, and masts.

• Secure clamping: Supplied with threaded ends intended to be secured with nuts and washers (e.g., DIN 934 and DIN 125 in A2) to create a firm and rigid lock.

How are U-bolt sizes read (NPS vs. actual outer diameter)?

U-bolts are dimensioned according to NPS (Nominal Pipe Size), which means the inch designation indicates the pipe's nominal size and not the bolt's actual inner width in inches:

• Example: A U-bolt marked $1" \text{ (DN 25)}$ is intended for a standard pipe with an outer diameter of approx. 33.7 mm. The bolt's inner dimension is therefore adapted to clear this pipe diameter with the correct clearance.

• Use the size chart: Always check the pipe's actual outer diameter ($d$) in millimeters against our size chart before ordering to ensure you choose the right bolt.

Why is stainless steel A2 (AISI 304) suitable for industrial and outdoor installations?

A2 steel (1.4301 / AISI 304) provides high and long-lasting corrosion protection in most environments:

• Outdoor and construction installations: Withstands rain, snow, condensation, and varying temperatures without being weakened by surface rust.

• Industry & Ventilation: Perfect for suspending and clamping pipelines, ventilation ducts, and cable ladders in workshops, basements, and industrial premises.

• No crevice corrosion on the pipe: Unlike galvanized bolts, stainless A2 bolts do not cause galvanic stress or rust damage on stainless pipelines.