29552836 1/2 inch spring washer Allison spare parts

29552836 1/2 inch spring washer Allison spare parts

The Allison 29552836 1/2-inch spring washer is a core fastener component of the Allison transmission, designed specifically for original equipment manufacturer (OEM) specifications. As a “protective guardian against loosening” in transmission bolt connections, its core function is to generate continuous axial preload through its own elastic deformation, increasing the friction between the bolt and the connected components. This effectively prevents bolt loosening and detachment caused by equipment vibration. It also functions as a buffer, shock absorber, and compensator for preload loss. Widely used in heavy-duty trucks, construction machinery, buses, special-purpose vehicles, and other equipment equipped with Allison transmissions, it is suitable for bolt fixing scenarios involving transmission housings, control valves, oil pressure gauges, and other components. It is a crucial basic component ensuring secure connections between transmission components and preventing wear and malfunctions caused by loose bolts. Precisely matching OEM installation standards, it requires no additional modifications and can be directly and quickly assembled, significantly improving equipment assembly efficiency and operational safety.

Core technical parameters:

– Product Model: Allison 29552836
– Product Name: 1/2 inch Spring Washer
– Main body material: 65Mn spring steel (default material) / 304 stainless steel (optional), conforming to SAE 1050-1065 carbon steel material standard requirements.
– Specifications: 1/2 inch (nominal diameter), inner diameter 12.7mm ± 0.1mm, outer diameter 22.2mm ± 0.2mm, thickness 2.5mm ± 0.1mm
– Hardness standards: Rockwell hardness HRC44-48 (after heat treatment), Brinell hardness HB380-420, elastic recovery rate ≥85%
– Surface treatment: Zinc/cadmium plating (optional), followed by baking to prevent hydrogen embrittlement, resulting in a smooth, burr-free, and rust-free surface.
– Operating temperature: -40℃~180℃ (suitable for extreme high and low temperature conditions, without brittleness or elastic failure)
– Anti-loosening performance: Axial preload ≥1500N, no loosening after vibration test (10-1000Hz, amplitude ≤0.35mm), anti-loosening effect meets DIN9250 standard.
– Fatigue life: ≥500,000 elastic deformation tests without fracture or permanent deformation, far exceeding the service life of ordinary spring washers.
– Corrosion resistance: Surface electroplating + passivation treatment, resistant to oil, dust, and atmospheric corrosion; no rust after ≥48 hours of salt spray testing.
– Compatible bolts: 1/2 inch bolts of various sizes, suitable for bolting components such as Allison transmission housings, control valves, and oil pressure gauges.

Core advantages:

Firstly, it is reliable and durable in preventing loosening. Made of 65Mn spring steel with a precision heat treatment process, it has strong elastic recovery ability and can continuously provide stable preload force, effectively preventing bolts from loosening due to equipment vibration and avoiding component connection failure. In the elastic recovery test, it can maintain at least one-third of the original minimum crown height.
Secondly, the dimensions are precisely matched, with the 1/2-inch specification accurately conforming to the original factory standard. The inner diameter, outer diameter, and thickness errors are strictly controlled, and there are no sharp edges. The bolts and connecting parts are not damaged during assembly, and the original installation position is perfectly matched.
Thirdly, it has excellent wear and corrosion resistance. The surface is electroplated and baked, which effectively resists the corrosion of the gearbox under the conditions of oil and dust, prevents rust and hydrogen embrittlement, and the service life can be more than 3 times that of ordinary spring washers.
Fourth, it has excellent compatibility, accurately matching the original Allison 29552836 model, and is compatible with 1/2-inch bolts and the entire Allison gearbox series. It can be directly put into assembly without adjustment, making installation convenient. At the same time, stainless steel material can be selected according to needs to adapt to different corrosive working conditions.

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