29505797 Screw Allison spare parts

29505797 Screw Allison spare parts

Allison 29505797 screws, as core fastening components of Allison transmissions, are hailed as the “strong link” connecting transmission components. Their core function is to precisely fasten key parts such as the transmission housing, shaft system, gears, and support components, transmit loads, fix component positions, and prevent screws from loosening or falling off due to vibration during equipment operation. This avoids component displacement, wear, abnormal operating noise, or even transmission failure caused by fastening failure, ensuring stable power transmission of the transmission, extending the service life of the entire machine, and reducing maintenance costs and downtime losses.

Core technical parameters:

-Part Number: Allison 29505797
– Material Specifications: High-quality high-strength alloy steel (grade 10.9/12.9) is selected and processed by professional heat treatment process of carburizing, quenching and tempering. The tensile strength is ≥1000MPa (grade 10.9) and ≥1200MPa (grade 12.9). The Rockwell hardness is controlled at 32-39HRC (grade 10.9) and 38-44HRC (grade 12.9). The material contains a reasonable proportion of alloying elements such as chromium, nickel and molybdenum, and the content of harmful elements such as sulfur (S≤0.03%) and phosphorus (P≤0.03%) is strictly controlled. The screw surface is treated with zinc plating, cadmium plating or Dacromet plating.
– Structure type: Cross-head/Hex socket screw (adapted as needed), with a one-piece molded structure and precision rolled threads; the screw head is countersunk/cylindrical; the screw shank is smooth and burr-free, without cracks or defects.
– Size parameters: Specifications cover M3-M12 (compliant with standard fastener specifications), length 8-100mm, thread pitch 0.5-1.75mm, head diameter 6-18mm, dimensional tolerance controlled within ±0.02mm, precisely matching Allison gearbox mounting hole size and nut specifications, with a fit clearance controlled within 0.01-0.03mm.
– Protective performance: Temperature range -40℃ to 180℃; oil resistance grade meets GB/T 1226-2010 standard, can withstand corrosion from various transmission oils and hydraulic oils, neutral salt spray test ≥96h; impact resistance meets ISO 16750 standard, impact absorption energy at room temperature ≥27J.
– Applicable Scenarios: Dedicated to Allison series transmissions, widely used in commercial vehicles, heavy trucks, construction machinery and other equipment equipped with Allison transmissions. It is used for fastening key parts such as transmission housing, shaft system, gears, support components, and sealing components, undertaking the core tasks of component fixation and load transmission. It can be used for original parts replacement, transmission repair and maintenance, and is suitable for complex working conditions such as heavy load, high frequency vibration, and heavy oil contamination.

Core product advantages:

1. Original factory fit: Precisely corresponds to Allison part number 29505797, no hole modification or adapter required, direct original installation, seamlessly connects to all connection parts and nuts of the gearbox.
2. High tensile strength: Made of high-quality high-strength alloy steel with professional heat treatment process, it has excellent tensile and shear strength, can withstand large tightening torque and equipment operation load, is not easy to break or strip, and has an elongation after fracture of ≥8% (12.9 grade) and ≥9% (10.9 grade), ensuring no risk of brittle fracture.
3. Excellent anti-loosening and wear resistance: The precision rolled thread design, combined with the anti-loosening structure (anti-loosening washer/anti-loosening coating), effectively prevents screws from loosening due to high-frequency vibration of the equipment; the surface is professionally treated with anti-corrosion, with outstanding anti-rust, anti-corrosion and anti-wear capabilities.
4. Convenient and practical: The cross-head/hex socket and countersunk/cylindrical head structure design ensures precise dimensions and clear threads. No complicated tools are required; a single person can complete the installation and disassembly with a screwdriver and wrench. The high thread fit ensures smooth and jam-free installation. It is not easy to loosen after tightening, and the later maintenance is simple, requiring no frequent repairs.
5. Long-lasting and durable: The core components undergo rigorous selection and processing, making them wear-resistant, corrosion-resistant, and anti-aging. They have passed stringent tensile tests, high and low temperature tests, and impact tests, and show no performance degradation after long-term use, with a service life far exceeding the industry average.

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