Lockable Mailbox on Thin-Wall Galvanized Tube with Type 2 Foundation

Report Number(s): TRNo. 0-6946-R3

Description: This system consisted of a lockable mailbox attached to a galvanized thin-wall steel tube support secured inside a 12-gauge galvanized anchor socket embedded in a concrete footing. The bottom (floor) of the mailbox was mounted 42 inches above grade. Details of this system are described in Maintenance Division standard MB-15(1). The Oasis Jr. Elite lockable mailbox (Model #620010B-10) had approximate dimensions of 15 inches tall by 12 inches wide by 18.1 inches deep and weighed 23 lb. Attachment of the mailbox to the post was accomplished using a mailbox bracket with an integral collar (DHT #161443). The bracket was secured to the bottom of the mailbox using four ⅜-inch-diameter by 1¼-inch-long SAE Grade 5 hex bolts, two 2-inch by 5½-inch by ⅛-inch ASTM A36 plate washers, and associated hardware. The collar on the mailbox bracket was positioned over and secured to the top of the support post using a 5/16-inch-diameter by 3-inch-long SAE Grade 5 hex bolt with associated hardware. The support post was a 2⅜-inch-outside-diameter by 0.095-inch-thick galvanized thinwall steel tube (DHT #143426). The support post was inserted approximately 8 inches into a 2⅜-inch-outside-diameter by 0.125-inch-thick galvanized thin-wall steel tube socket (DHT #143434) and secured with a curved steel wedge plate (DHT #143433) on the impact side. The socket was embedded 27 inches deep and installed flush with the top of a TxDOT Type 2 nonreinforced concrete footer that measured approximately 12 inches in diameter by 30 inches deep.

Test Level: 3

MASH Test Number: 3-61

Proprietary/Non-proprietary: Non-proprietary

Pass/Fail: Pass

Evaluation: Full-Scale Crash Testing

Sponsor: TxDOT