C93200 SAE 660 High Lead Tin Bearing Bronze Bushing For lift arms application!

The use of SAE 660 bronze as the material for these bushings is a suitable choice given its proven performance in similar applications. By incorporating solid lubricant graphite into the SAE 660 material, you can maintain the mechanical properties and corrosion resistance of the bronze while significantly enhancing its lubrication capabilities.

For systems utilizing lift arms with various-sized bronze bushings that don’t fully rotate 180 degrees, leading to uneven grease distribution and binding, there are two primary solutions to consider:

• Grooved Figure 8 Design Bearings made of SAE 660 Bearing Bronze: This material is frequently chosen for crafting grooved Figure 8 design bearings. These bearings feature oil grooves to enhance lubrication efficiency. The unique “Figure 8” oil grooves in these bronze bushings, constructed from SAE 660 bronze, are tailored for cold-finished shafts to ensure optimal lubrication.
• Cast Bronze Sleeve Bearings with a Grease Groove Design: These bushings, crafted from continuous cast C93200 (SAE 660) bronze, are meticulously designed with grease grooves for effective lubrication. They are particularly effective in applications with oscillatory movements, both axial and radial, as they guarantee the even spread of lubrication to minimize friction and wear.

In the specific scenario of lift arms that don’t complete a full 180-degree rotation, resulting in challenges with grease spreading, the Cast Bronze Sleeve Bearings featuring a Grease Groove Design may offer a better solution. The design of the grease grooves in these bearings is intended to ensure that lubrication reaches all parts of the bushing, even with restricted rotation, thereby aiding in the prevention of binding.

SAE 660 bronze bushings are a versatile and reliable choice for many applications due to their excellent mechanical properties, good corrosion resistance, and ability to withstand high loads. However, their suitability for a specific application should be evaluated based on the specific environmental and load conditions.

C93200, also referred to as SAE 660, is a leaded tin bronze alloy celebrated for its exceptional wear resistance among other advantageous characteristics. This alloy finds widespread use across numerous industrial fields, including automotive, construction equipment, and general machinery, due to its notable qualities. It stands out for its excellent capabilities in brazing and welding, minimal shrinkage coefficient, and its non-magnetic nature. Standard sleeve bearings made from C93200 bronze are readily available, yet there’s also the option for custom fabrication to accommodate specific needs. This material is distinguished by its robust strength and wear resistance, available in a variety of forms like solid pieces, tubes, cored bars, and plates. C93200 bronze bearings are esteemed for their dependable operation, high load-bearing capacity, and superior wear resistance, rendering them ideal for an extensive array of industrial and mechanical uses.

SAE 660 material, also known as C93200, is a type of leaded tin bronze alloy. It is widely recognized for its excellent wear resistance, making it a popular choice for various industrial applications. This alloy is part of the Bronze family, specifically within the high-leaded tin bronze category. SAE 660 is known for its strength, durability, and ability to withstand high loads and speeds, which makes it suitable for bearings, bushings, and similar components.

The composition of SAE 660 includes a mix of copper, tin, lead, and zinc, which provides a good balance between strength and wear resistance, as well as the ability to form a lubricating film to reduce friction in moving parts. Its lead content helps in enhancing its machinability and antifriction properties. SAE 660 is also noted for its good performance in brazing and welding, low shrinkage coefficient during casting, and its non-magnetic properties.

Due to these characteristics, SAE 660 (C93200) is extensively used in applications such as automotive parts, earth-moving machinery, and general mechanical components where durability and reliability are essential.

These bronze alloys contain lead concentrations ranging from 7% to 15%. The presence of high lead levels in these tin bronzes enhances their machinability and maintains advantageous thermal conductivity and lubrication qualities, thanks to the lead. Alloy C93200 stands out as the primary choice within this group, serving as the go-to alloy for numerous bearing applications due to its widespread utility and reliability.

LIFT ARM SEA660 bronze bushing with a groove and circular design

a critical element in mechanical assemblies that demand a robust and low-friction pivot. The term SEA660 is indicative of the SAE 660 bronze alloy, recognized for its superior strength, outstanding resistance to wear, and the ability to withstand high loads as well as resist corrosion and fatigue. This alloy is particularly well-suited for demanding applications found in sectors like maritime, automotive, and heavy machinery due to these properties.

The inclusion of a groove within the bushing’s structure is purposefully engineered to ensure an even spread of lubricant, which is essential for the seamless functioning and increased lifespan of both the bushing and the lift arm it accommodates. The “Figure 8” groove pattern exemplifies one method of lubrication groove implementation aimed at enhancing lubricant spread over the bearing surface to optimize performance and reduce wear. Various groove configurations, including circumferential, spiral, and straight patterns, can be customized to meet specific operational needs.

Manufacturing of SAE 660-bearing bronze is achievable through different techniques, such as casting for intricate shapes and sizes at a lower cost, and machining for superior precision and detail. The self-lubricating feature of this alloy is especially advantageous in scenarios where consistent lubrication is crucial. bronzelube.com, A member of the VIIPLUS of companies.

Bronze Self-Lubricating Bearings

In essence, the grooved LIFT ARM SEA660 bronze bushing represents a premium quality component crafted from SAE 660 bronze alloy, engineered to ensure a friction-minimizing pivot in mechanical systems. Its design not only promotes lubricant distribution for smooth operation but also contributes to the durability of the system under high-stress and load conditions.

Technical Data of Alloys
Material Code
Material Grade	CuZn25Al5Mn4Fe3	CuSn5Pb5Zn5	CuAl10Ni5Fe5	CuSn12	CuZn25Al5Mn4Fe3
Density	8 g/cm3	8.9 g/cm3	7.8 g/cm3	8.9 g/cm3	8 g/cm3
Hardness	>210 HB	>70 HB	>150 HB	>95 HB	>235 HB
Tensile Strength	>750 N/mm2	>200 N/mm2	>600 N/mm2	>260 N/mm2	>780 N/mm2
Yield Strength	>450 N/mm2	>90 N/mm2	>260 N/mm2	>150 N/mm2	>450 N/mm2
Percentage Elongation %	>12	>15	>10	>8	>8
Linear Expansion Coefficient	1.9×10-5/℃	1.8×10-5/℃	1.6×10-5/℃	1.8×10-5/℃	1.9×10-5/℃
Working Temperature	-40~+300 ℃	-40~+400 ℃	-40~+400 ℃	-40~+400 ℃	-40~+400 ℃
Max Load	100 N/mm2	60 N/mm2	50 N/mm2	70 N/mm2	120 N/mm2
Max Speed (Dry)	15 m/min	10 m/min	20 m/min	10 m/min	15 m/min
Max PV (Lubrication) N/mm2·m/min	200	60	60	80	200
Compression Deformation 300N/mm2	<0.01mm	<0.05mm	<0.04mm	<0.05mm	<0.005mm

Bronze Self-Lubricating Bearings, available with or without a flange, are constructed from high-quality cast bronze embedded with a proprietary solid lubricant. This combination is designed to support high-load applications without the need for additional lubrication.

Features & Advantages: The bronze composition enhances the bearing’s mechanical strength and load-bearing capabilities, while the embedded solid lubricant ensures a consistent lubrication supply, creating a reliable lubrication system. These bearings are ideal for medium to high load applications, especially where frequent stops and starts are common.

• Layer 1: Initial Lubricating Film – Provides early lubrication to minimize friction.
• Layer 2: Solid Lubricants – Arranged to align with the motion direction, these create a lubricating film.
• Layer 3: Bronze Alloy – Enhances mechanical strength, as well as impact and corrosion resistance.

Custom fabrication is available to meet specific customer requirements and specifications.

SAE 660 cast bronze sleeve bearings are crafted from continuous cast bronze, specifically C93200 bearing bronze, aligning with ASTM B505 standards. This material blend typically contains around 83% copper, 7% tin, 7% lead, and 3% zinc, offering notable hardness, strength, wear resistance, and superior anti-friction properties. The SAE 660 bronze is particularly adept at supporting heavy loads at moderate speeds or light loads at elevated speeds.

The standard tolerances for these bearings are defined as F7 for the inner diameter (ID) and m6 for the outer diameter (OD). Post press fitting, the F7 tolerance ensures the ID is nearly equivalent to the actual size, facilitating a tight fit within a housing that usually has an H7 tolerance. The m6 tolerance for the OD provides a range of fit that can either slightly interfere or transition, suitable for precise applications where minor interference is permissible.

While specific ID and OD tolerances can vary by manufacturer. Such tolerances guarantee a precise fit, preserving the functionality of the machinery’s moving components. It’s crucial to recognize that these standard tolerances apply to typical bearing sizes and may differ for bespoke sizes or unique requirements. Additionally, manufacturers might offer customization options like resizing, adding oil grooves, or drilling the bearings to accommodate specific needs.