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Question: Should I use two chocks instead of one?
Answer: Yes! Two wheel chocks provide twice the protection of one (see Best Use).
Question: On a mine site. What should I use for my pickup?
Answer: OUT-R paired, orange urethane chocks are light weight, easy to see and compliant.
Question: Which chocks are required for my fire trucks?
Answer: HWG Super Grippers exceed all national standards for chock use fire apparatus.
Question: My Corvette sits in a garage and I donít want anything to happen to it.
Question: Are aluminum chocks better than rubber wheel chocks?
Answer: Aluminum chocks generate coefficients of friction from transferring the forces from the axle to the rear teeth of the chock onto a small area that, in turn, creates a high psi or grip. Aluminum chocks keep their shape under extreme loads and will not diminish in height under pressure. Also, aluminum chocks are not affected by cold conditions.
Question: Why are rubber chocks effective?
Answer: Rubber chocks effectively grip with anything they contact except ice and snow.
Question: How do I choose between contour and pyramid rubber chocks?
Answer: Contours capture or fit the tire better than pyramid ones. Pyramid chocks work well considering they stop the rotation of the tire like putting a finger in a clock face. Pyramids transfer the load of the tireís forces vertically to the ground via a wide, stable base.
Question: I haul a backhoe on a dual-axle utility trailer. Which chocks are best?
Question: Our driveway is very steep, paved. What is the best chock to use?
Question: Should I place the chock directly against the wheel?
Answer: Yes. After an 8í roll on a 30% grade velocity can be as high as 3 feet per second.
Question: How do I calculate my percent grade?
Answer: Use rise over run. A 3 foot rise over 10 feet is equal to a 30% grade.
Question: Our loading docks require durable aluminum wheel chocks that will not cut tires or hands and that is easy to use. Which chock best?
Answer: Our HGSY is an excellent chock for this purpose. HGSY-EPR have added features that aid in visibility and ease of deployment. Consider chocking both sides of the trailer HGSY-EPL by adding a left sided chock to meet OSHA regulations. Driver friendly and enforceable!
Question: Our rubber chocks broke. Are there durable, economical chocks for loading docks?
Question: My cement mixer trucks are often on soft ground. What can I do?
Answer: You need a wide based chock to resist soil compression. HRR chocks would work well.
Question: Why is SAE-J348 important?
Answer: Society of Automotive Engineers standard for wheel chocks, SAE-J348, defines the forces a wheel chock can expect under extreme conditions. NOTE: SAE-J348 does not consider coefficients of friction or the benefits of paired usage.
Question: What is the EPDM material used in extruded rubber chocks?
Answer: EPDM is an acronym for a synthetic rubber, Ethylene Propylene Diene Monomer. EPDM has a saturated polymer chemical "backbone" which gives it excellent resistance to ozone and many other advanced chemicals found in today's environment. EPDM is a highly flexible and stable material that is perfect for very demanding environments.
Question: What is SBR rubber?
Answer: SBR (styrene butadiene rubber) is technical chemical: styrene-butadiene copolymer. SBR is an abrasion resistant material with excellent physical strength.
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