13-15
®
GENERAL TORQUE SPECIFICATIONS
8.8 10.9 12.9
8.8
10.9 12.9
NOTICE
Ÿ Do not re-use grade 8 or grade 9 bolts or nuts - replace with new ones.
Ÿ Loose or overtorqued bolts can cause death, severe injury, or property
damage. Maintain proper bolt torque. Visually check bolts daily. Check
torque every 50 hours.
Ÿ Grade 9 bolts must be used with Grade 9 washers.
WARNING
!
This BARKO technical standard lists torque specifications for commonly used threaded fasteners.
This standard is to be followed by all business functions of BARKO Hydraulics, LLC unless otherwise
noted.
NUT & BOLT GRADES AND IDENTIFICATION
UNIFIED THREAD STANDARD (UTS) ISO METRIC SCREW THREAD
ACRONYMS / DEFINITIONS
Ÿ SAE Society of Automotive Engineers
Ÿ ASTM American Society for Testing and Materials
Ÿ ISO International Organization for Standardization
Ÿ ANSI American National Standards Institute
Ÿ UTS Unified Thread Standard
Ÿ SHCS Socket Head Cap Screw
Ÿ UNF Unified National Fine Thread, per ANSI B1.1
Ÿ UNC Unified National Coarse Thread, per ANSI B1.1
Ÿ HHCS Hex Head Cap Screw
Ÿ ASME The American Society of Mechanical Engineers
Grade 5 Class 8.8
Grade 8 Class 10.9Grade 9 Class 12.9
BOLTS BOLTS
NUTS NUTS
LOCK NUTS LOCK NUTS
07/26/2018
Updated
OPERATOR’S
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