[TowerTalk] mast for two big antennas

[SPWoo]

Hi Jorge,

It's easier to stick to a 2" OD.  I went with 2" OD but with a 3/8" wall 4130 chromoly.  The cost difference between 1/4" and 3/8" is not significant.  I want to make sure the mast outlasts me!  Attached below are the details of my mast and the cost.  I had to pay another vender to galvanize it for me for an additional $150.  So a total cost of $650.  Not cheap but when you look a the big picture it's cheap insurance.  Using the windload calculator this mast is good for 135mph for my two yagis.  We do get 120mph winds here once in a decade.  GL and 73.


CERTIFICATE OF TEST                    
for reference only                      6050 DOWNING STREET
13-Sep-2012                             DENVER
Quote No: 695993                       CO  80216


Description: 4130 CDS TUBING SR, ASTM A 519
2.000 OD X .375 W S/C 15'0" ( 180.0")
Heat: 001M59442            Item: 100549

Specifications: 
ASTM A 519 06            
-----------------------------------------------------------
                 CHEMICAL ANALYSIS
-----------------------------------------------------------
C       MN      P       S       SI      NI      CR      MO      
0.29    0.55    0.009   0.016   0.22    0.13    1.01    0.16    
CU      AL      
0.23    0.02    
-----------------------------------------------------------
RCPT:  R733705
VENDOR:  MICHIGAN SEAMLESS TUBE      COUNTRY OF ORIGIN : USA
----------------------------------------------------------------
                  MECHANICAL PROPERTIES
----------------------------------------------------------------
                YLD STR     ULT TEN    %ELONG   %RED   HARDNESS
DESCRIPTION       PSI        PSI      IN 2 IN  IN AREA     BHN
                  104628.0   122695.0  18.7                 101
----------------------------------------------------------------
EDDY CURRENT: OK

------------------------------------------------------------
------------------------------------------------------------
ITEM#: 100549
CUST. PART NO: 
PO NO: 
DATE/TYPE: 9/21/2012 (DELIVERY DATE)
DESCRIPTION: 1 PC-15 FT              
             4130 CDS TUBING SR, ASTM A 519
             2.000 OD X .375 W S/C 15'0" ( 180.0")
ORD. QTY.:            1
UOM: EA
UNIT PRICE:      $480.00
EXT. PRICE:       $480.00
OTHER: CUTTING SAW
TOLERANCE: +1/8 -0
        SHIP VIA: OUR TRUCK
Ship Weight: 98 LB
----------
Total Ship Weight For The Order: 98 LB
TOTAL: $480.00
Sales Tax: $31.19
Grand Total: $511.19
====================
 
Best Regards,
Jonathan Woo
(970) 646-1711