Hub Discs

Hub Disc 24HUBDISC

$12.95

ChrisNik Plastic Hub Disc
1-1/2in diameter plastic Two-Sided Hub Disc
1/8in center hole
Color: Orange/Yellow
Legend: "SURVEY MARKER DO NOT REMOVE"
100 per pack (5 sheets, 20 per sheet)

Collections: Nails & Tacks, Supplies

Presco Texas Roll Flagging -Texas Flagging & Accessories- eGPS Solutions Inc.

Seymour Stripe Solvent-Based Inverted Marking Paint 17 oz -Inverted Tip Marking Paint- eGPS Solutions Inc.

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Mag nails 100 ct. -Nails & Tacks- eGPS Solutions Inc.

Mag nails 100 ct.

$5.95

Size

3/4" X 1/8"

1" X 5/32"

1-1/4 X 3/16"

1-1/2" X 1/4"

2" X 1/4"

2-1/2" X 1/4"

Qty

Mag Nails at a Glance
There are many different tasks we use mag nails in the field of surveying and construction for.

Control Points
Most commonly used during a survey or for construction would be setting control. This can be achieved by using a robotic total station or a GPS/VRS unit. Typically you would set the point in location to your liking and occupy it with a GPS unit, or it could be shot in using a set instrument like a robotic gun. Once coordinates are set on the point you could move and occupy this as a known point. Since the Mag nails have a dimple or depression in the center of the nail's head it is very easy to occupy this using a survey rod and elevation can be check or set with a leveling rod in the future. Don't forget to ribbon up the nail and spray some paint around it so you can find it again!

Construction offsets
During construction many surveyors will set offsets to points because the original location or centerline of points will typically be where construction is taking place. Critical points include offsetting curb, manholes, underground pipes, building corners, and so on. If I was setting manholes in an existing pavement parking lot I would set a centerline of manhole point, then a 15' offset followed by a 25' offset in a straight line with painted instructions to the cut/fill for the manholes Rim and Invert elevations according to the engineering plans provided. This concept could potentially work for a situation involving proposed waterline underneath a road, where I would set nails online or where the waterline was purposed but also pull offsets so when the road was being dug up the contractor could use my offsets to reestablish the original center points.

Property & Boundary
This is another example of a situation where mag nails may be used. Let us say a Farmers property goes to the centerline of a road near and it then follows said centerline until it reaches the corner of his lot. This would be an example where we could use mag nails to set points along the road to depict his property. Although mag nails may not be the most permanent type of boundary point, they are called out and accepted on surveys as such.

Cross Ties & Benchmarks
Another common use for mag nails in the field of surveying would be setting cross ties to critical points and benchmarks for future purposes of construction. If you set a permanent monument in say the center of the road depicting a section corner or boundary, you could potentially set several cross ties to reestablish that point in the future using mag nails. A Benchmark is a vertical reference to elevation previously established for a survey using a level or possible GPS system. Most benchmarks like control are established for future reference concerning a construction project or topographic survey to be completed. Mag nails do a good job of establishing these points as they create a semi-permanent point of reference for the surveyor to use at his or her discretion.

Personal Experience
Once I had an opportunity to use and try out mag nails, I was pleasantly surprised. In the past we had only used PK nails as they were the only thing available. Thankfully ChrisNik Mag Nails came out and we purchased a few boxes, which quickly made our decision to switch to the mag nails an easy one. We noticed that the nails would indeed be found father away from the locator, and instead of being right on top of the nail we could sweep areas around it and still get a good sounding. In addition the nails ability to accept a stronger striking blow was immediately apparent as it did not bend as easily nor did the head snap off like so many PK nails I managed to deal with in the past.

Sizes
The sizes range from smaller nails to more custom size larger nails, the particular model I've been discussing and using for the purpose of this review is the 1 ½" x ¼" . We use the smaller nails as the costs are less between 20-25 bucks for a box of 100. I've seen mag nails usually 5 bucks more a box than PK's, but I believe you get what you pay for and the quality is well worth the extra money. In all honesty it can get pretty expensive if you are setting many of these points, for lets say a centerline of road every 50' for 2 miles.

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