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techtalk:ref:tools806 [2020/04/29 00:04] – [Grade Marks and Material Properties for Bolts and Screws] hippysmacktechtalk:ref:tools806 [2021/01/29 01:07] (current) – hippysmack
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 [[:techtalk:menu|{{  :techtalk:gototechnicalmenu.jpg|}}]] [[:techtalk:menu|{{  :techtalk:gototechnicalmenu.jpg|}}]]
-====== REF: HD List of Hardware P/N & Descriptions ====== 
-\\ 
  
 ====== Strengths Of Various Fasteners ====== ====== Strengths Of Various Fasteners ======
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 ====== Grade Marks and Material Properties for Bolts and Screws ====== ====== Grade Marks and Material Properties for Bolts and Screws ======
  
-Bolts, screws and other fasteners are marked on the head with a symbol that identifies the grade of the fastener.\\+Bolts, screws and other fasteners are marked on the head with a symbol that identifies the grade of the fastener. ((Machinery's Handbook 27th Edition dated 2004 pg 1508)) \\
 The grade specification establishes the minimum mechanical properties that the fastener must meet. \\ The grade specification establishes the minimum mechanical properties that the fastener must meet. \\
 Additionally, industrial fasteners must be stamped with a registered head mark that identifies the manufacturer. \\ Additionally, industrial fasteners must be stamped with a registered head mark that identifies the manufacturer. \\
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 {{:techtalk:ref:svcproc:bolt_head_grade_markings.jpg?direct&300|}} ((drawing by Hippysmack)) \\ {{:techtalk:ref:svcproc:bolt_head_grade_markings.jpg?direct&300|}} ((drawing by Hippysmack)) \\
 +
  
 ====== Mechanical Properties and Grade Markings of Nuts ====== ====== Mechanical Properties and Grade Markings of Nuts ======
  
-Three grades of hex and square nuts designated Grades 2, 5, and 8 are specified by the SAE 1995 standard covering nuts in the 1/4" to 1-1/2" diameter range. \\+Three grades of hex and square nuts designated Grades 2, 5, and 8 are specified by the SAE 1995 standard covering nuts in the 1/4" to 1-1/2" diameter range. ((Machinery's Handbook 27th Edition dated 2004 pg 1509)) \\
 Grades 2, 5, and 8 nuts roughly correspond to the SAE specified bolts of the same grade. \\ Grades 2, 5, and 8 nuts roughly correspond to the SAE specified bolts of the same grade. \\
 Additional specifications are given for miscellaneous nuts such as hex jam nuts, hex slotted nuts, heavy hex nuts, etc. \\ Additional specifications are given for miscellaneous nuts such as hex jam nuts, hex slotted nuts, heavy hex nuts, etc. \\
 Generally speaking; use nuts of a grade equal to or greater than the grade of the bolt being used. \\ Generally speaking; use nuts of a grade equal to or greater than the grade of the bolt being used. \\
-Grade 2 nuts are not required to be marked, however, all grades 5 and 8 nuts in the 1/4" to 1-1/2" range must be +  * Grade 2 Nuts: 
-marked in one of three ways: \\ +    * Grade 2 nuts are not required to be marked. 
-Grade 5 nuts may be marked with a dot on the face of the nut and a radial or circumferential mark at 120° counterclockwise from the dot. \\  +  * Grade 5 Nuts (1/4" to 1-1/2" range): 
-Or a dot at one corner of the nut and a radial line at 120° clockwise from the nut, or one notch at each of the +    * A dot on the face of the nut and a radial or circumferential mark at 120° counterclockwise from the dot. 
-six corners of the nut. \\ +    * Or a dot at one corner of the nut and a radial line at 120° clockwise from the nut. 
-Grade 8 nuts may be identified by a dot on the face of the nut with a radial or circumferential mark at 60° counterclockwise from the dot. \\ +    * Or one notch at each of the six corners of the nut. 
-Or a dot at one corner of the nut and a radial line at 60° clockwise from the nut, or two notches at each of the six +  * Grade 8 Nuts (1/4" to 1-1/2" range): 
-corners of the nut. \\+    * A dot on the face of the nut with a radial or circumferential mark at 60° counterclockwise from the dot. 
 +    * Or a dot at one corner of the nut and a radial line at 60° clockwise from the nut. 
 +    * Or two notches at each of the six corners of the nut. 
 ====== Detecting Counterfeit Fasteners ====== ====== Detecting Counterfeit Fasteners ======
  
-Fasteners with markings identifying them as a specific grade or property class are counterfeit if they don't meet standards established for that class. \\+Fasteners with markings identifying them as a specific grade or property class are counterfeit if they don't meet standards established for that class. ((Machinery's Handbook 27th Edition dated 2004 pg 1509)) \\
 Counterfeit fasteners may break unexpectedly at smaller loads than expected. \\  Counterfeit fasteners may break unexpectedly at smaller loads than expected. \\ 
 Generally, these fasteners are made from the wrong material or they are not properly strengthened during manufacturing. \\ Generally, these fasteners are made from the wrong material or they are not properly strengthened during manufacturing. \\

Trace: • EVO: Oiling & Lubrication - Sub-03C