The trade-offs necessary to choose a fluid involve a consideration of application requirements such as health, safety, and environmental effects, and fluid properties such as viscosity, stability, compressibility, gas solubility, and lubricity. measures how a fluid resists flow. It is the single most important property of a hydraulic fluid. A hydraulic fluid that is too viscous usually causes high-pressure drop, sluggish operation, low-mechanical efficiency, and high-power consumption. High-pressure, high-precision systems are particularly sensitive to viscosity at low temperatures. They can be penalized harshly by pump cavitation and sluggish response of critical actuators. Low-viscosity fluids permit efficient low-drag operation, but tend to increase wear, reduce volumetric efficiency, and promote leakage. In theory, this leakage can be predicted on the basis of fluid viscosity and streamline flow through a known gap. But the clearance of some pump leakage paths depends on operating pressure and temperature, so leakage may show considerable deviation from the theoretical viscosity-flow curves. measures how viscosity changes with temperature. Ideally, the fluid should have the same viscosity at very low temperatures as at high temperatures. In reality, this goal is unattainable. Fluids that come close to achieving the goal have high viscosity indexes; low indexes, on the other hand, indicate wide fluctuations of viscosity with temperature. Typical viscosity indexes for petroleum oils range from 90 to 105, and those for polyglycols from 160 to 200. A high viscosity index is most important in applications subjected to a wide temperature range: mobile hydraulic systems used outdoors, industrial systems that are stopped and started during the winter in an unheated plant, and the like. These systems require a high viscosity-index fluid. An industrial system in a heated plant, on the other hand, could get by with a low viscosity-index fluid. Some fluids have fairly high viscosity indexes to begin with. Others commonly
Products & Services
Hitch Pins and Linch Pins
Hitch pins and their variations are simple forms of hardware used to temporarily mount or conjoin mating components. Linch pins are specifically designed to retain wheels or other rotating devices on their axles, but can be used as a fastener as well. Both of these types of pins require mating holes and some form of a lock to be effective.
Cam Followers
Cam followers or track rollers are rolling element bearings with either an integral stud or an inseparable inner ring for yoke mounting on a pin or shaft.
Pulley Blocks
Pulley blocks are assemblies that consist of a hook or shackle, swivel, bearing, sheaves, sprockets, pins and frame. They are suspended by a hoisting rope or load chain and are designed for a variety of lifting applications.
Cotter Pins and Wire Clips
Cotter pins and wire clips are penetrating and/or coupling mechanical fasteners. They are easy to install and remove. Cotter pins come in several forms, with each designed for a specific kind of assembly. Some cotter pins are suitable for use as shear pins.
Product Announcements
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Custom Load Pin Designs from Strainsert
The internally gaged Clevis Pin (invented by Strainsert, U.S. Patent No. 3,695,096) is designed to measure forces transmitted/supported through pin joints.
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Standard Force Sensing Clevis Pins/Bolts, CPA/CBA Series from Strainsert
The Force Sensing Clevis Pin or Clevis Bolt, otherwise known as load pins, are unique strain gage transducers utilizing the...
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Strainsert Company, a premier manufacturer of standard and custom force sensors for research, testing, weighing and control applications in the Aerospace, Military, Marine and Automotive industries,...
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Instrumented Clevis Pins for Sheave Applications from Strainsert
Many Strainsert Instrumented Clevis Pin designs are incorporated into sheave and pulley systems.
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Strainsert Load Sensing Actuator Clevis Pins, SPHC Series
The Force Sensing Actuator Clevis Pin are unique strain gage transducers utilizing the internal strain gage transducer process developed by...
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Strainsert's load cell and clevis pin design expertise lets us guide the custom design process with the customer, identify the requirements, plan out stages to meet them, test and then ship the...
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Strainsert is proud to design and develop successful solutions that match the needs and help our customers be more productive and innovative in their particular industries.
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Strainsert's manufacturing experience allows us to internally engineer solutions and test/certify the products according to specifications.
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For over forty five years, Strainsert has designed and developed many custom strain gage transducers and systems to address specific and unique customer requirements.
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Strainsert load cells and load pins, as well as our force sensing bolts and tension links have been used for decades to support new aircraft and spacecraft hardware designs, assembly, testing and...
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Topics of Interest
Pins are typically used under primarily shear loading. They are separated into two groups: semipermanent and quick release. These general design rules apply to all types of semipermanent pins: Removal...
There are only a few coupling methods that work with high misalignment angles in rotating equipment. A spring retainer on the pins lets users quickly disassemble individual joints. A splined shaft...
Fasteners that maximize assembly life Pins provide a simple and effective way to join parts. Pins can be an economical and durable alternative to other mechanical fasteners. Slotted and coiled spring...
3.6 EMBEDDED RIGID FASTENERS
For some applications it is advantageous, and for some materials and loading situations it is necessary, to embed mechanical fasteners into or permanently attach them...
17.1 The Feed System
The feed system of an injection mould tool comprises four main components (see Figure 17.1):
The sprue (for a cold runner tool)
Cold slug well (for a cold runner tool)...
