DRESSTA TD-25M EXTRA, Service Manual

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INTRODUCTION
SECTION 1
Page 13
DRESSTA TD-25M EXTRA
STANDARD TORQUES
10. BOLT IDENTIFICATION CHART
Type / Class Description
Head
Marking
Type 5
Inch
Thread
Three radial lines on top and none on side of head.
Medium carbon steel quenched and tempered.
Type 5.2
Inch
Thread
Three radial lines on top and none on side of head.
Low carbon boron steel quenched and tempered.
Type 8
Inch
Thread
Six radial lines on top and none on side of head.
Medium carbon or carbon alloy steel quenched and tempered.
Type 8.2
Inch
Thread
Six radial lines on top and none on side of head.
Low carbon boron steel quenched and tempered.
Class 5.8
Metric
Thread
Marked on top or side of head. Low or medium carbon steel.
Class 8.8
Metric
Thread
Marked on top or side of head. Medium carbon or carbon
alloy or low carbon boron steel quenched and tempered.
Class 10.9
Metric
Thread
Marked on top or side of head. Medium carbon or carbon
alloy or low carbon boron steel quenched and tempered.
11. TORQUE VALUES FOR STANDARD FASTENERS
The following charts provide tightening torque for general purpose applications using original
equipment standard hardware as listed in the PARTS CATALOGUE for the machine involved. DO
NOT SUBSTITUTE.
Special torques and applications which are nonstandard are listed separately on a SPECIAL NUT
AND BOLT TORQUE charts in further Sections of the manual.
A torque value to a tolerance of
±
10 [%] of the chart value should be achieved for a satisfactory
applications.
Torque Values for Standard English Fasteners
Original equipment standard hardware is defined as Type 8, coarse thread bolts and nuts and thru
hardened flat washers (Rockwell “C” 38-45), all phosphate coated and assembled without
supplemental lubrication (as received) condition. The torques shown below also apply to the
following: phosphate coated bolts used in tapped holes in steel or gray iron; phosphate coated
bolts used with phosphate coated prevailing torque nuts (nuts with distorted threads or plastic
inserts); phosphate coated bolts used with copper plated weld nuts.
Markings on bolt heads or nuts indicate material grade ONLY and are NOT to be used to
determine required torque.