PN: 1.5TH-M Category: .

Product Description

1.5TH-M Series Magnetic Base SMR Adapters

For a more secure hold

The 1.5TH-M Series magnetic adapters provide all of the features of our 1.5TH Series, with the addition of three magnets on the bottom surface of the adapter. These magnets provide a holding force if the adapter is placed in a hole in a ferrous material. The SMR seats on a 3-point conical land and is held in place by a magnet. An optical alley allows the SMR to be rotated down for a lower shooting angle. Various diameters and offsets are available – see tables below to construct the part number for the item you want.

Part Number Construction: 1.5TH-M-A-B.
Choose an “A” value, and pair with desired “B” value (at right) to create the item number for the product you want.
Offset Value “A”
1.000″ 1
25 mm 25MM
Shank Diameter Value “B” Shank Diameter Value “B”
0.100″ .1 4 mm 4MM
1/8″ .125 5 mm 5MM
3/16″ .1875 6 mm 6MM
1/4″ .25 7 mm 7MM
5/16″ .3125 8 mm 8MM
3/8″ .375 9 mm 9MM
7/16″ .4375 10 mm 10MM
1/2″ .5 11 mm 11MM
9/16″ .5625 12 mm 12MM
5/8″ .625 13 mm 13MM
3/4″ .75 14 mm 14MM
7/8″ .875 15 mm 15MM
1″ 1

May Be Used With

Any 1.5″ diameter SMR 


Adapter dia.: 1.6″
Material: Stainless steel
Shank diameter tolerance:
−0.0001″ to −0.0005″ (−0.003mm to −0.013mm)
Offset tolerance: ±0.0005″ (±0.013mm)
Target centering tolerance: ±0.0005″ (±0.013mm)
Hardness: HRC 42-4



English (PDF)


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Brunson 1.5TH-M drawing

PN: 1.5TH-M Category: .