Richard Casady wrote:
How come stainless cable is more than six times as costly as
galvanized, yet nobody uses the galvanized. Stainless the same size
has about 80% of the breaking strength. Galvanized is what they guy
power poles with.

Casady

OK, while we are at it lets clarify what we are talking about when we
say "Galvanized Wire." Most (all?) of it is 7-strand. It comes in a
variety of dimensions and grades. It is important to understand that
not all "galvanized" wire is the same.

Just look at 1/4" for example:
Common = 1,900 lbs
Siemens Martin = 3, 150 lbs
HS = 4,750 lbs
EHS = 6,650 lbs

It also comes with three levels of galvanizing:
Class A: Minimum amount of zinc coating.
Class B: Twice the amount of zinc coating as “A.”
Class C: Three times the amount of zinc coating as “A.”

Then there are various fittings. The "bullets" form Preformed Line
Products would seem to me to make good connectors.



I copied this from
http://www.anixter.it/AXECOM/AXEDocLib.nsf/(UnID)/8DBC60E3F238E8CF80256F2500690530/$file/WCTHContentsInstallation.pdf


Size Grade Wt/1,000 ft Breaking Strength
3?16 Common 73 1,150
3?16 Utility 2.2M 73 2,400
1?4 Common 121 1,900
1?4 Siemens Martin 121 3,150
1?4 High Strength 121 4,750
1?4 Ex. High Strength 121 6,650
5?16 Common 205 3,200
5?16 Siemens Martin 205 5,350
5?16 Utilities Grade 6M 225 6,000
5?16 High Strength 205 8,000
5?16 Ex. High Strength 205 11,200
3?8 Common 273 4,250
3?8 Siemens Martin 273 6,950
3?8 Utility 10M 273 11,500
3?8 High Strength 273 10,800
3?8 Ex. High Strength 273 15,400
7?16 Siemens Martin 399 9,350
7?16 High Strength 399 14,500
7?16 Utility 16M 399 18,000
1?2 Siemens Martin 517 12,100
1?2 High Strength 517 18,800
1?2 Utility 25M 517 25,000

Then there is 30% EHS Copper-Clad Steel, that might but the best bet of
all??? 6,282 lbs

hpeer wrote:
Richard Casady wrote:
How come stainless cable is more than six times as costly as
galvanized, yet nobody uses the galvanized. Stainless the same size
has about 80% of the breaking strength. Galvanized is what they guy
power poles with.

Casady

OK, while we are at it lets clarify what we are talking about when we
say "Galvanized Wire." Most (all?) of it is 7-strand. It comes in a
variety of dimensions and grades. It is important to understand that
not all "galvanized" wire is the same.

Just look at 1/4" for example:
Common = 1,900 lbs
Siemens Martin = 3, 150 lbs
HS = 4,750 lbs
EHS = 6,650 lbs

It also comes with three levels of galvanizing:
Class A: Minimum amount of zinc coating.
Class B: Twice the amount of zinc coating as “A.”
Class C: Three times the amount of zinc coating as “A.”

Then there are various fittings. The "bullets" form Preformed Line
Products would seem to me to make good connectors.



I copied this from
http://www.anixter.it/AXECOM/AXEDocLib.nsf/(UnID)/8DBC60E3F238E8CF80256F2500690530/$file/WCTHContentsInstallation.pdf



Size Grade Wt/1,000 ft Breaking Strength
3?16 Common 73 1,150
3?16 Utility 2.2M 73 2,400
1?4 Common 121 1,900
1?4 Siemens Martin 121 3,150
1?4 High Strength 121 4,750
1?4 Ex. High Strength 121 6,650
5?16 Common 205 3,200
5?16 Siemens Martin 205 5,350
5?16 Utilities Grade 6M 225 6,000
5?16 High Strength 205 8,000
5?16 Ex. High Strength 205 11,200
3?8 Common 273 4,250
3?8 Siemens Martin 273 6,950
3?8 Utility 10M 273 11,500
3?8 High Strength 273 10,800
3?8 Ex. High Strength 273 15,400
7?16 Siemens Martin 399 9,350
7?16 High Strength 399 14,500
7?16 Utility 16M 399 18,000
1?2 Siemens Martin 517 12,100
1?2 High Strength 517 18,800
1?2 Utility 25M 517 25,000

On Tue, 10 Feb 2009 21:55:47 -0500, hpeer wrote:

OK, while we are at it lets clarify what we are talking about when we
say "Galvanized Wire." Most (all?) of it is 7-strand. It comes in a
variety of dimensions and grades. It is important to understand that
not all "galvanized" wire is the same.

I checked out a cable company website. They have wire rope, galv, and
stainless. No seven strand,they had7x7 and 7x19, and maybe 19x7.
Roebling the guy who built the Brooklyn bridge, invented cable with
three sizes of wire, to have less wasted air space, and be rounder.
They sell it today.

Casady

"Richard Casady" wrote in message
...
On Tue, 10 Feb 2009 21:55:47 -0500, hpeer wrote:

OK, while we are at it lets clarify what we are talking about when we
say "Galvanized Wire." Most (all?) of it is 7-strand. It comes in a
variety of dimensions and grades. It is important to understand that
not all "galvanized" wire is the same.

I checked out a cable company website. They have wire rope, galv, and
stainless. No seven strand,they had7x7 and 7x19, and maybe 19x7.
Roebling the guy who built the Brooklyn bridge, invented cable with
three sizes of wire, to have less wasted air space, and be rounder.
They sell it today.

The first figure (7) is the number of strands. 7 strand wire is six strands
wound round a seventh wire core.
The second number is the number of individual wires in each strand. In 7 x 7
each individual strand is itself six wires wound round a seventh as core.
Some galvanised wires are 6 x (number of wires). This construction is 6
strands wound round a hemp core.
The higher the number of wires in a strand the more flexible the complete
rope is

So 7 x 7 would be a stiffish wire suited to standing rigging. Not so good
for going round pulleys as the individual wires will be thicker and subject
to fatigue..
Having said that however this wire construction is recommended by the makers
of my steering gear which is why I am now having to replace the wires
because the first strand or two have fatigued and are protruding where the
wire goes round the pulleys at the bottom of the pedestal. However I do not
know how many years thee wires have been in service. If using this wire to
go round a pulley make sure the pulley is as large diameter as possible.

7 x 19 would be more flexible for running gear and because the individual
strands are thinner this wire would corrode more rapidly.

Never heard of 19 x 7. If it exists it must be for some special application,
not for boats.

Standing rigging these days is normally 1 x 19 SS wire. This is a single
strand containing 19 wires and cannot be used where any flexibility is
required

Edgar wrote:
"Richard Casady" wrote in message
...
On Tue, 10 Feb 2009 21:55:47 -0500, hpeer wrote:

OK, while we are at it lets clarify what we are talking about when we
say "Galvanized Wire." Most (all?) of it is 7-strand. It comes in a
variety of dimensions and grades. It is important to understand that
not all "galvanized" wire is the same.
I checked out a cable company website. They have wire rope, galv, and
stainless. No seven strand,they had7x7 and 7x19, and maybe 19x7.
Roebling the guy who built the Brooklyn bridge, invented cable with
three sizes of wire, to have less wasted air space, and be rounder.
They sell it today.

The first figure (7) is the number of strands. 7 strand wire is six strands
wound round a seventh wire core.
The second number is the number of individual wires in each strand. In 7 x 7
each individual strand is itself six wires wound round a seventh as core.
Some galvanised wires are 6 x (number of wires). This construction is 6
strands wound round a hemp core.
The higher the number of wires in a strand the more flexible the complete
rope is

So 7 x 7 would be a stiffish wire suited to standing rigging. Not so good
for going round pulleys as the individual wires will be thicker and subject
to fatigue..
Having said that however this wire construction is recommended by the makers
of my steering gear which is why I am now having to replace the wires
because the first strand or two have fatigued and are protruding where the
wire goes round the pulleys at the bottom of the pedestal. However I do not
know how many years thee wires have been in service. If using this wire to
go round a pulley make sure the pulley is as large diameter as possible.

7 x 19 would be more flexible for running gear and because the individual
strands are thinner this wire would corrode more rapidly.

Never heard of 19 x 7. If it exists it must be for some special application,
not for boats.

Standing rigging these days is normally 1 x 19 SS wire. This is a single
strand containing 19 wires and cannot be used where any flexibility is
required



The 7 strand (6 over 1 as you note) is what is commonly used as
messenger or guy wire for "telephone" cable. It's what you will get if
you cut down a telephone pole.

On Wed, 11 Feb 2009 14:57:10 -0500, hpeer wrote:

Never heard of 19 x 7. If it exists it must be for some special application,
not for boats.

19x7 is used for cranes as it lacks the tendency to twist when
loaded.There is also 19x19 and 6x37

Casady