What is the recommended torque for assembling a Flange connection kit, AISI 304 steel, DIN 933 (class A2-70) for type SZ2 flanges?

Flange connection kit, AISI 304 steel, DIN 933 Format . Recommended tightening torque for screws (A2-70) used with SZ2 flanges: - For M8 screws (A2-70): 25â30 NÂ·m - For M10 screws (A2-70): 45â50 NÂ·m - For M12 screws (A2-70): 70â75 NÂ·m - For M16 screws (A2-70): 140â150 NÂ·m Use plain washers under the nuts as included. Tighten gradually in a cross (star) pattern to ensure even flange compression and avoid flange distortion. If gasket manufacturer or flange table (attachment) specifies different torque or a reduced seating torque, follow those values. If lubrication (anti-seize) is applied to threads, reduce torques by ~10â20% according to lubricant specification.

Can the Flange connection kit, AISI 304 steel, DIN 933 be used with PN16 and PN40 SZ2 flanges without changing screw length?

Flange connection kit, AISI 304 steel, DIN 933 Format: No - you cannot assume the supplied screws (DIN 933, A2-70, 4 pcs) will fit both PN16 and PN40 SZ2 flanges without changing screw length. The kit notes âSelection of screws and nuts for flanges according to the table in the attachment,â which implies different flange pressure ratings/face types (PN16 vs PN40) require specific screw lengths. PN40 flanges are typically thicker/heavier and often need longer bolts than PN16. Use the manufacturerâs attachment/table to choose proper screw length for each PN class; replace screws if lengths differ.

Are the A2-70 nuts in the Flange connection kit, AISI 304 steel, DIN 933 compatible with galvanic coatings?

Yes. A2-70 nuts in the Flange connection kit, AISI 304 steel, DIN 933 Format are compatible with most common galvanic (electroplated) coatings, but with important caveats. Key points: - Base material: AISI 304 (austenitic stainless steel) is generally compatible with electroplating processes (zinc, nickel, chromium), and coatings will adhere. - Corrosion performance: Applying dissimilar metallic coatings (e.g., zinc) can reduce corrosion resistance at coating defects and may create galvanic couples if mated with different base metals. Uncoated stainless against zinc-plated steel can be vulnerable where the coating is damaged. - Hydrogen embrittlement: A2-70 (a medium-strength stainless fastener) is less susceptible to hydrogen embrittlement than high-strength carbon steels, but some electroplating processes (zinc plating with aggressive pre-treatments) can introduce hydrogen; controls and proper post-treatments (baking) mitigate risk. - Dimensional/fit issues: Plating thickness can alter thread fit; tolerances should be checked for threaded assemblies. - Recommended best practice: - Prefer stainless-compatible coatings (passivation, electropolishing, or trivalent chromium) or use stainless plating processes (e.g., nickel-free passivation) if corrosion resistance must be preserved. - If zinc or other sacrificial coatings are used on mating parts, ensure galvanic compatibility and consider insulating layers or using similarly coated counterparts. - Confirm plating specifications, hydrogen relief bake, and thread tolerances with the coating supplier. Conclusion: A2-70 nuts in the Flange connection kit, AISI 304 steel, DIN 933 Format can be electroplated, but for optimal corrosion and mechanical performance verify coating type, pretreatment, hydrogen relief, and galvanic compatibility with mating parts.

A set for connections flange, steel AISI 304, DIN 933

All products, Flange couplings/

Additional information

A set for connections flange (EN 1092), type SZ2. W set: bolts DIN 933 – 4 pcsi, a nut – 4 pcsi and washer – 4 pcsi. class properties mechanical: A2-70 – bolts; A2-70 – a nut. Selection of bolts and nuts for flanges according to the table in the attachment. Material: steel AISI 304.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Price	Quantity	Actions	Catalogue
TK-SZ2-M16-050-B-SS304	Set (4 pcs) bolts M16x50, nuts, washers, AISI 304	-	-	In stock	0 zł		Enquiry
TK-SZ2-M16-060-B-SS304	Set (4 pcs) bolts M16x60, nuts, washers, AISI 304	-	-	In stock	0 zł		Enquiry

Do you need a larger quantity of products or a bespoke quote?

Call us: +48 61 653 02 22 or email us: tubes@tubes-international.com

SEND ENQUIRY

A set for connections flange (EN 1092), type SZ2. W set: bolts DIN 933 – 4 pcsi, a nut – 4 pcsi and washer – 4 pcsi. class properties mechanical: A2-70 – bolts; A2-70 – a nut. Selection of bolts and nuts for flanges according to the table in the attachment. Material: steel AISI 304.