![double mast 4-bolt base](https://www.hapco.com/wp-content/uploads/d-mast-arm-4bolt-base.jpg)
4-Bolt Base
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To download a printable file, click PDF Download >
Details
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
4-Bolt Cast Aluminum Base Flange of Alloy 356-T6 with Aluminum Bolt Covers (Alloy 356-F) and Stainless Steel Hex Head Attaching Screws.
![](https://www.hapco.com/wp-content/uploads/2021/01/4bolt-Base-BC-off.jpg)
Handhole
6″ Butt Diameter – Reinforced, 3″ x 5″ curved Cast Aluminum Frame (Alloy 356-T6) with Aluminum Door and two (2) SS Hex Head Screws. A Grounding Provision incorporating a 3/8″ diameter hole is provided opposite the Handhole.
![](https://www.hapco.com/wp-content/uploads/2021/01/HH-3x5-Rnd-Re-duo.jpg)
7″+ Butt Diameters – Reinforced, 4″ x 6″ curved Cast Aluminum Frame (Alloy 356-T6) with Aluminum Door and two (2) SS Hex Head Screws. Reinforced Frame will contain a tapped 3/8″-16NC Grounding Provision.
![](https://www.hapco.com/wp-content/uploads/2021/01/HH-4X6-500X500.jpg)
Anchorage
Anchorage Kit will include four (4) L-shaped Steel Anchor Bolts conforming to AASHTO M314-90 Grade 55. Ten inches (10″) of threaded end will be galvanized per ASTM A153. Kits will contain four (4) Hex Nuts, four (4) Lock Washers, and four (4) Flat Washers (all components Galvanized Steel). A bolt circle template will be provided.
Base and Anchorage Details
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![](https://www.hapco.com/wp-content/uploads/2021/01/ABs-4bolt-split-500x567-1.jpg)
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 Double Mast Arm 4-Bolt Base
Click on the Product No. to download interactive PDF specification drawing.
Pole Height | Product No. | Butt Dia | Wall | Arm Length | Old Product No. |
---|---|---|---|---|---|
20′ | RTA20C6B4M24-** | 6″ | 0.156” | 4′ | 22-082 |
RTA20C6B4M26-** | 6″ | 0.156” | 6′ | 22-085 | |
RTA20C6B4M28-** | 6″ | 0.156” | 8′ | 22-087 | |
RTA20D6B4M24-** | 6″ | 0.188” | 4′ | 22-002 | |
RTA20D6B4M26-** | 6″ | 0.188” | 6′ | 22-005 | |
RTA20D6B4M28-** | 6″ | 0.188” | 8′ | 22-007 | |
RTA20C7B4M26-** | 7″ | 0.156” | 6′ | 22-095 | |
RTA20C7B4M28-** | 7″ | 0.156” | 8′ | 22-097 | |
RTA20D7B4M26-** | 7″ | 0.188” | 6′ | 22-015 | |
RTA20D7B4M28-** | 7″ | 0.188” | 8′ | 22-017 | |
25′ | RTA25C6B4M24-** | 6″ | 0.156” | 4′ | 22-412 |
RTA25D6B4M24-** | 6″ | 0.188” | 4′ | 22-282 | |
RTA25D6B4M28-** | 6″ | 0.188” | 8′ | 22-287 | |
RTA25C7B4M24-** | 7″ | 0.156” | 4′ | 22-362 | |
RTA25C7B4M26-** | 7″ | 0.156” | 6′ | 22-365 | |
RTA25C7B4M28-** | 7″ | 0.156” | 8′ | 22-367 | |
RTA25D7B4M24-** | 7″ | 0.188” | 4′ | 22-292 | |
RTA25D7B4M26-** | 7″ | 0.188” | 6′ | 22-295 | |
RTA25D7B4M28-** | 7″ | 0.188” | 8′ | 22-297 | |
RTA25C8B4M24-** | 8″ | 0.156” | 4′ | 22-372 | |
RTA25C8B4M26-** | 8″ | 0.156” | 6′ | 22-375 | |
RTA25D8B4M26-** | 8″ | 0.188” | 6′ | 22-305 | |
RTA25D8B4M28-** | 8″ | 0.188” | 8′ | 22-307 | |
30′ | RTA30C7B4M24-** | 7″ | 0.156” | 4′ | 22-692 |
RTA30C7B4M26-** | 7″ | 0.156” | 6′ | 22-695 | |
RTA30D7B4M24-** | 7″ | 0.188” | 4′ | 22-572 | |
RTA30C8B4M24-** | 8″ | 0.156” | 4′ | 22-642 | |
RTA30C8B4M26-** | 8″ | 0.156” | 6′ | 22-645 | |
RTA30C8B4M28-** | 8″ | 0.156” | 8′ | 22-647 | |
RTA30D8B4M24-** | 8″ | 0.188” | 4′ | 22-582 | |
RTA30D8B4M26-** | 8″ | 0.188” | 6′ | 22-585 | |
RTA30D8B4M28-** | 8″ | 0.188” | 8′ | 22-587 | |
RTA30F8B4M26-** | 8″ | 0.250” | 6′ | 22-605 | |
RTA30F8B4M28-** | 8″ | 0.250” | 8′ | 22-607 | |
RTA30D1C4M24-** | 10″ | 0.188” | 4′ | 22-662 | |
35′ | RTA35C8B4M24-** | 8″ | 0.156” | 4′ | 22-922 |
RTA35D8B4M24-** | 8″ | 0.188” | 4′ | 22-862 | |
RTA35D8B4M26-** | 8″ | 0.188” | 6′ | 22-865 | |
RTA35D8B4M28-** | 8″ | 0.188” | 8′ | 22-867 | |
RTA35E8B4M26-** | 8″ | 0.219” | 6′ | 22-875 | |
RTA35F8B4M24-** | 8″ | 0.250” | 4′ | 22-882 | |
RTA35F8B4M26-** | 8″ | 0.250” | 6′ | 22-885 | |
RTA35F8B4M28-** | 8″ | 0.250” | 8′ | 22-887 | |
RTA35D1C4M24-** | 10″ | 0.188” | 4′ | 22-942 | |
RTA35D1C4M26-** | 10″ | 0.188” | 6′ | 22-945 | |
RTA35D1C4M28-** | 10″ | 0.188” | 8′ | 22-947 | |
40′ | RTA40D8B4M24-** | 8″ | 0.188” | 4′ | 50701-041 |
RTA40D8B4M26-** | 8″ | 0.188” | 6′ | 50701-001 | |
RTA40F8B4M24-** | 8″ | 0.250” | 4′ | 50701-045 | |
RTA40F8B4M26-** | 8″ | 0.250” | 6′ | 50701-009 | |
RTA40F8B4M28-** | 8″ | 0.250” | 8′ | 50701-010 | |
RTA40D1C4M26-** | 10″ | 0.188” | 6′ | 50701-013 | |
RTA40D1C4M28-** | 10″ | 0.188” | 8′ | 50701-014 | |
RTA40E1C4M26-** | 10″ | 0.219” | 6′ | 50701-015 | |
RTA40E1C4M28-** | 10″ | 0.219” | 8′ | 50701-016 | |
RTA40F1C4M26-** | 10″ | 0.250” | 6′ | 50701-017 | |
RTA40F1C4M28-** | 10″ | 0.250” | 8′ | 50701-018 |