Screw M8x30

Screw 410363 is a socket head cap screw M8x30 made of A2 stainless steel to DIN 912. The cylindrical head with hexagon socket allows installation in locations with restricted access, where an open-end or socket wrench cannot complete a full rotation. Material A2 (acid-resistant stainless steel, equivalent to AISI 304) provides corrosion resistance in the pressure washer environment – under constant contact with working water, moisture and detergents.

Symptoms – when to replace

• Damaged or rounded hexagon socket in the head – the hex key rotates without gripping, and the screw cannot be removed or tightened.
• Mechanical damage to the thread – the screw does not run in smoothly or shows play after tightening to the nominal torque.
• Thread galling from prolonged contact with carbon steel in a humid environment – a galvanic effect with mixed materials.
• Cracking or deformation of the shank – particularly in connections exposed to motor or pump vibration.

How to select the right part

Three parameters must match simultaneously: thread M8, length 30mm and material A2. The length of a DIN 912 screw is measured from the underside of the head to the end of the shank – it does not include the head. The cylindrical M8 DIN 912 head has a standard height of 8mm – if you measure the total length including the head and get approximately 38mm, the shank is 30mm and the screw is correct.

The most common mistake in this family: ordering M8x55 (410172) instead of M8x30 (410363) or vice versa, because both have an identical thread, material and standard. Before ordering, always measure the shank length of the removed screw – do not assume the length from packaging or a supplier name.

Material A2 is not interchangeable with ordinary galvanised carbon steel – in locations with constant water contact, retain the same material when replacing.

Compatibility

Fastener for Kranzle pressure washers. Verify the range of application by reference number 410363 and dimensions M8x30 DIN 912 A2.

[faq]

How does screw M8x30 (410363) differ from M8x55 (410172), and how to avoid confusing them when ordering?|The only difference is shank length – 30mm vs 55mm. The M8 thread, A2 material and DIN 912 standard are identical. When ordering online, both numbers can appear side by side in search results for "M8 DIN 912 A2 Kranzle screw". Always check the length in the product name before adding to the basket. During disassembly, measure the shank length with a calliper – from the underside of the head to the end of the thread – and order the same dimension. Ordering a screw 25mm longer than the seat may make correct assembly impossible or damage components on the other side of the connection.

What are the risks of fitting a screw that is too long (M8x55) where M8x30 is specified?|In a through-threaded hole, a screw that is too long will protrude on the other side and may clash with adjacent components – the pump housing, motor or accessories. In a blind hole (threaded only to a specific depth), the screw will bottom out before the head flange presses the fitted component down – the connection will not be fully tightened and the component will be loose. In both cases, a connection that is not properly tightened under motor vibration risks the fitted part working loose.

How to correctly measure the depth of a threaded hole to confirm that a 30mm screw is correct and not 55mm?|Measure the hole depth with a feeler gauge or a simple steel rod with a depth mark. From the usable thread depth (hole depth minus the clearance at the bottom in a blind hole) you get the maximum shank length. For M8 in aluminium, the minimum thread engagement for a reliable connection is approximately 12–16mm (1.5–2× thread diameter) – a 30mm screw gives adequate engagement at smaller depths. A 55mm screw would require a seat with at least 55mm of usable depth – which is rare in typical washer housing components.

Is the tightening torque of an M8x30 A2 screw the same as an M8x55 A2 of the same material?|The nominal tightening torque is determined by the material strength class and thread diameter – for A2 M8 screws it is the same regardless of shank length. A practical difference arises with short screws in deep seats – the hex key must have sufficient working arm length to reach the screw head in the recess. With an M8x30 in a recessed mounting position, a short-arm hex key may not allow full torque to be achieved – use a key with sufficient reach or a ball-end key for working at an angle.

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