The APT Model 137 Rock Drill is a versatile midsize Rock Drill used in general construction, utility work, and plant maintenance. It is designed for drilling through granite, hard faced rock, quarry drilling and for drilling secondary holes for blasting. It can also be used in conjunction with dowel hole drilling machines. This Model 137 is adaptable to wet drilling application by attaching the APT valve, wet tube and swivel assembly.
View and/or Download M137: Spec Sheet / Manual
| Part # | Units | 5223 | 5224 | 5225 | 5226 | 5227 | 5228 |
| Type | in | Dry | Wet | Dry | Wet | Dry | Wet |
| Hex Chuck Size | in | 7/8" x 3 - 1/4" | 7/8" x 4 - 1/4" | 1" x 4 - 1/4" | |||
| Bore Diameter | in | 2 - 3/8" | |||||
| Stroke | in | 2 - 5/8" | |||||
| Blows per Minute | bpm | 2300 | |||||
| CFM @ 90 psi | in | 85 - 90 | |||||
| Weight | lbs | 38 | |||||
| Length | in | 19 - 3/4" | |||||
| Air Inlet NPT | 1/2 MALE NPT | ||||||
The recommended air requirement for the operation of APT tools is 90 psi (6.2 bar). Lower air pressure will decrease power, too high a pressure will increase unwanted stresses in the tool. For proper CFM ratings, please refer to the specification charts shown for each tool in this catalog.
APT recommends the use of at least 1⁄2” inside diameter or larger hoses to assure sufficient air flow to the tool. For portable compressor hose and longer lengths, 3⁄4 “ hose is recommended. Keep the overall length of the hose to a minimum to prevent pressure loss at the tool.
Hoses should be rated for a minimum of 250 psi (17.2 bar). Before connecting the air hose to the tool, check the tool inlet connector to be sure it is clean and free of dirt or debris. Keeping dirt and debris from entering the tool will assure long and satisfactory operation.