single mast arm with t-base

T-Base

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Details

RTA Mast Arm Breakaway T-base Pole Specifications

Pole

The pole shaft will be constructed of seamless extruded tube of 6063 Aluminum Alloy per the requirements of ASTM B221. The shaft assembly shall be full-length heat treated after base weld to produce a T6 temper.

Base Style

Cast Aluminum Transformer Base (T-Base) of Alloy 356-T6 with Aluminum Door and Stainless Steel Hex Head Screw. FHWA Approved Breakaway.

 

Handhole

6″-10″ Butt Diameters – Tapered Door Opening (9-3/4″ W Base x 9-1/4″ W Top x 11-3/4″ H) with Flush Mount Aluminum Cover and Stainless Steel Hex Head Screw. Grounding Provisions tapped 1/4″-20NC and 1/2″-13NC are provided.
 
T-Base Cover On

Anchorage

Base Anchorage includes four (4) L-shaped Steel Anchor Bolts conforming to AASHTO M314-90 Grade 55, four (4) each Heavy-Duty Flat Washers, Lock Washers, and Hex Nuts (all components Galvanized Steel). Ten inches (10″) of threaded end will be galvanized per ASTM A153. Top Connecting Hardware includes four (4) each 1″-8NC x 3-3/4″ Hex Head Bolts, Flat Washers, Heavy-Duty Flat Washers, Lock Washers, and Hex Nuts (all components Galvanized Steel). A bolt circle template will be provided.

Base and Anchorage Details
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T-base anchor bolts in the ground

Vibration Damper

When determined necessary by Hapco, a Vibration Damper will be factory-installed inside the pole shaft. Customer specification of the damper is available.

Vibration Dampers
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Satin Aluminum Finish

Pole surface will contain a uniform Brushed Aluminum natural finish. Finish to be achieved utilizing specially formulated abrasives in a multi-pass, rotary sanding operation.

Powder Coat Finish

Coating material will be a thermosetting polyester AAMA 2604 Super Durable powder electrostatically applied, oven cured and bonded in a closed loop, automated system. Minimum thickness of finish will be two (2) mils. Hapco’s Powder Coat Finish Warranty on aluminum poles is five (5) years.

Finish Options
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Pole Shaft Warranty

Hapco warrants its aluminum pole assemblies for their lifetime to be free of defects in material and workmanship.

Hapco Lifetime Pole Assembly Warranty
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Specification Drawings – RTA Mast Arm Breakaway T-Base

Click on the Product No. to download interactive PDF specification drawing.

Pole HeightProduct No.Butt DiaWallOld Product No.
20′RTA20C7BFM14-**7″0.156”[ 4′ ] 23-092
RTA20C7BFM16-**7″0.156”[ 6′ ] 23-095
RTA20C7BFM18-**7″0.156”[ 8′ ] 23-097
25′RTA25C7BFM14-**7″0.156”[ 4′ ] 23-362
RTA25C7BFM16-**7″0.156”[ 6′ ] 23-365
RTA25C7BFM18-**7″0.156”[ 8′ ] 23-367
RTA25D7BFM14-**7″0.188”[ 4′ ] 23-292
RTA25D7BFM16-**7″0.188”[ 6′ ] 23-295
RTA25D7BFM18-**7″0.188”[ 8′ ] 23-297
RTA25D8BFM16-**8″0.188”[ 6′ ] 23-305
RTA25D8BFM18-**8″0.188”[ 8′ ] 23-307
30′RTA30C7BFM14-**7″0.156”[ 4′ ] 23-692
RTA30C8BFM14-**8″0.156”[ 4′ ] 23-642
RTA30C8BFM16-**8″0.156”[ 6′ ] 23-645
RTA30C8BFM18-**8″0.156”[ 8′ ] 23-647
RTA30D8BFM14-**8″0.188”[ 4′ ] 23-582
RTA30D8BFM16-**8″0.188”[ 6′ ] 23-585
RTA30D8BFM18-**8″0.188”[ 8′ ] 23-587
35′RTA35D8BFM14-**8″0.188”[ 4′ ] 23-862
RTA35D8BFM16-**8″0.188”[ 6′ ] 23-865
RTA35D8BFM18-**8″0.188”[ 8′ ] 23-867
RTA35E8BFM14-**8″0.219”[ 4′ ] 23-872
RTA35E8BFM16-**8″0.219”[ 6′ ] 23-875
RTA35E8BFM18-**8″0.219”[ 8′ ] 23-877
40′RTA40D8BFM14-**8″0.188”[ 4′ ] 50702-041
RTA40D8BFM16-**8″0.188”[ 6′ ] 50702-001
RTA40D8BFM18-**8″0.188”[ 8′ ] 50702-002
RTA40E8BFM14-**8″0.219”[ 4′ ] 50702-043
RTA40E8BFM16-**8″0.219”[ 6′ ] 50702-005
RTA40E8BFM18-**8″0.219”[ 8′ ] 50702-006
RTA40D1CFM14-**10″0.188”[ 4′ ] 50702-047
RTA40D1CFM16-**10″0.188”[ 6′ ] 50702-013
RTA40D1CFM18-**10″0.188”[ 8′ ] 50702-014
45′RTA45D8BFM14-**8″0.188”[ 4′ ]
RTA45D8BFM16-**8″0.188”[ 6′ ]
RTA45D8BFM18-**8″0.188”[ 8′ ]
RTA45E8BFM14-**8″0.219”[ 4′ ]
RTA45E8BFM16-**8″0.219”[ 6′ ]
RTA45E8BFM18-**8″0.219”[ 8′ ]
RTA45D1CFM14-**10″0.188”[ 4′ ]
RTA45D1CFM16-**10″0.188”[ 6′ ]
RTA45D1CFM18-**10″0.188”[ 8′ ]
RTA45E1CFM14-**10″0.219”[ 4′ ]
RTA45E1CFM16-**10″0.219”[ 6′ ]
RTA45E1CFM18-**10″0.219”[ 8′ ]