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grade 5 bolts not marked if galvanized?

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grade 5 bolts not marked if galvanized?

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2

I went to a local building supply company - one that tends to have a better selection than the big-box places - seeking some Grade 5 carriage bolts.

They pointed me to bins of galvanized carriage bolts. I checked and did not see the 3 radial lines that normally mark Grade 5. They said "galvanized bolts do not have the marking, but rest assured they are Grade 5"; in fact, I believe they implied that galvanized are always Grade 5 (or higher).

I tend to think they are lying or misinformed, but thought I would seek clarification.

hardware

share|improve this question

edited 7 hours ago

RustyShackleford

asked 8 hours ago

RustyShacklefordRustyShackleford

47266 silver badges2020 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm using these to hang an old-school Hunter ceiling fan, the kind that are cast iron and weigh about 50lb. With the poor quality of hardware I've seen recently, I think it's worth getting graded bolts. I can always order them from places like boltdepot, but I would like to source locally.
  
  – RustyShackleford
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Do you need galvanized? Big box stores do sell grade 5 and grade 8 bolts. Auto parts stores are another source.
  
  – JPhi1618
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I don't need galvanized; that's just where they sent me when I said I needed Grade 5.
  
  – RustyShackleford
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  My assumption was that galvanized bolts are not graded and are low grade. Just go to an Ace or Lowes or Home Depot, but I'd be interested if anyone knows better about galvanized.
  
  – JPhi1618
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Those places MIGHT have grade 5 hex bolts, but not carriage.
  
  – RustyShackleford
  7 hours ago
  

  
  
  
  

add a comment | 

2

I went to a local building supply company - one that tends to have a better selection than the big-box places - seeking some Grade 5 carriage bolts.

They pointed me to bins of galvanized carriage bolts. I checked and did not see the 3 radial lines that normally mark Grade 5. They said "galvanized bolts do not have the marking, but rest assured they are Grade 5"; in fact, I believe they implied that galvanized are always Grade 5 (or higher).

I tend to think they are lying or misinformed, but thought I would seek clarification.

hardware

share|improve this question

edited 7 hours ago

RustyShackleford

asked 8 hours ago

RustyShacklefordRustyShackleford

47266 silver badges2020 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm using these to hang an old-school Hunter ceiling fan, the kind that are cast iron and weigh about 50lb. With the poor quality of hardware I've seen recently, I think it's worth getting graded bolts. I can always order them from places like boltdepot, but I would like to source locally.
  
  – RustyShackleford
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Do you need galvanized? Big box stores do sell grade 5 and grade 8 bolts. Auto parts stores are another source.
  
  – JPhi1618
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I don't need galvanized; that's just where they sent me when I said I needed Grade 5.
  
  – RustyShackleford
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  My assumption was that galvanized bolts are not graded and are low grade. Just go to an Ace or Lowes or Home Depot, but I'd be interested if anyone knows better about galvanized.
  
  – JPhi1618
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Those places MIGHT have grade 5 hex bolts, but not carriage.
  
  – RustyShackleford
  7 hours ago
  

  
  
  
  

add a comment | 

I went to a local building supply company - one that tends to have a better selection than the big-box places - seeking some Grade 5 carriage bolts.

They pointed me to bins of galvanized carriage bolts. I checked and did not see the 3 radial lines that normally mark Grade 5. They said "galvanized bolts do not have the marking, but rest assured they are Grade 5"; in fact, I believe they implied that galvanized are always Grade 5 (or higher).

I tend to think they are lying or misinformed, but thought I would seek clarification.

hardware

share|improve this question

edited 7 hours ago

RustyShackleford

asked 8 hours ago

RustyShacklefordRustyShackleford

47266 silver badges2020 bronze badges

share|improve this question

edited 7 hours ago

RustyShackleford

asked 8 hours ago

RustyShacklefordRustyShackleford

47266 silver badges2020 bronze badges

share|improve this question

edited 7 hours ago

RustyShackleford

asked 8 hours ago

RustyShacklefordRustyShackleford

47266 silver badges2020 bronze badges

asked 8 hours ago

RustyShacklefordRustyShackleford

47266 silver badges2020 bronze badges

asked 8 hours ago

RustyShacklefordRustyShackleford

47266 silver badges2020 bronze badges

2 Answers
2

active

oldest

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3

Highly unlikely that a Grade 5 bolt (90.000 psi yield, depending on size) would be galvanized. If electro-galvanizing were used these is a high risk of hydrogen cracking at that hardness level. If it were hot dip galvanized, the required temperature of about 800 F would temper the steel to a lower strength. This tempering affect can be fixed using alloy like chrome/moly, but now you have a pretty expensive bolt; not one available in a hardware store.

share|improve this answer

edited 2 hours ago

isherwood

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answered 3 hours ago

blacksmith37blacksmith37

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add a comment | 

2

I have not seen a carriage bolt in grade 5 or higher. If you want a bolt that will resist rusting then you should use grade 8 bolts. They are so hard that rusting is almost non existent.

share|improve this answer

answered 5 hours ago

d.georged.george

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add a comment | 

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3

Highly unlikely that a Grade 5 bolt (90.000 psi yield, depending on size) would be galvanized. If electro-galvanizing were used these is a high risk of hydrogen cracking at that hardness level. If it were hot dip galvanized, the required temperature of about 800 F would temper the steel to a lower strength. This tempering affect can be fixed using alloy like chrome/moly, but now you have a pretty expensive bolt; not one available in a hardware store.

share|improve this answer

edited 2 hours ago

isherwood

56.8k55 gold badges6868 silver badges150150 bronze badges

answered 3 hours ago

blacksmith37blacksmith37

2,00133 silver badges99 bronze badges

add a comment | 

3

Highly unlikely that a Grade 5 bolt (90.000 psi yield, depending on size) would be galvanized. If electro-galvanizing were used these is a high risk of hydrogen cracking at that hardness level. If it were hot dip galvanized, the required temperature of about 800 F would temper the steel to a lower strength. This tempering affect can be fixed using alloy like chrome/moly, but now you have a pretty expensive bolt; not one available in a hardware store.

share|improve this answer

edited 2 hours ago

isherwood

56.8k55 gold badges6868 silver badges150150 bronze badges

answered 3 hours ago

blacksmith37blacksmith37

2,00133 silver badges99 bronze badges

add a comment | 

Highly unlikely that a Grade 5 bolt (90.000 psi yield, depending on size) would be galvanized. If electro-galvanizing were used these is a high risk of hydrogen cracking at that hardness level. If it were hot dip galvanized, the required temperature of about 800 F would temper the steel to a lower strength. This tempering affect can be fixed using alloy like chrome/moly, but now you have a pretty expensive bolt; not one available in a hardware store.

share|improve this answer

edited 2 hours ago

isherwood

56.8k55 gold badges6868 silver badges150150 bronze badges

answered 3 hours ago

blacksmith37blacksmith37

2,00133 silver badges99 bronze badges

share|improve this answer

edited 2 hours ago

isherwood

56.8k55 gold badges6868 silver badges150150 bronze badges

answered 3 hours ago

blacksmith37blacksmith37

2,00133 silver badges99 bronze badges

edited 2 hours ago

isherwood

56.8k55 gold badges6868 silver badges150150 bronze badges

edited 2 hours ago

isherwood

56.8k55 gold badges6868 silver badges150150 bronze badges

answered 3 hours ago

blacksmith37blacksmith37

2,00133 silver badges99 bronze badges

answered 3 hours ago

blacksmith37blacksmith37

2,00133 silver badges99 bronze badges

2

I have not seen a carriage bolt in grade 5 or higher. If you want a bolt that will resist rusting then you should use grade 8 bolts. They are so hard that rusting is almost non existent.

share|improve this answer

answered 5 hours ago

d.georged.george

6,53322 gold badges88 silver badges1515 bronze badges

add a comment | 

2

I have not seen a carriage bolt in grade 5 or higher. If you want a bolt that will resist rusting then you should use grade 8 bolts. They are so hard that rusting is almost non existent.

share|improve this answer

answered 5 hours ago

d.georged.george

6,53322 gold badges88 silver badges1515 bronze badges

add a comment | 

I have not seen a carriage bolt in grade 5 or higher. If you want a bolt that will resist rusting then you should use grade 8 bolts. They are so hard that rusting is almost non existent.

share|improve this answer

answered 5 hours ago

d.georged.george

6,53322 gold badges88 silver badges1515 bronze badges

share|improve this answer

answered 5 hours ago

d.georged.george

6,53322 gold badges88 silver badges1515 bronze badges

answered 5 hours ago

d.georged.george

6,53322 gold badges88 silver badges1515 bronze badges

answered 5 hours ago

d.georged.george

6,53322 gold badges88 silver badges1515 bronze badges