L-708LD Bore Alignment Laser

L-708LD Bore Alignment Laser


The L-708 Standard and L-708LD Long Distance Bore Lasers are the latest addition to the bore alignment family of lasers. With the new coarse and fine adjustment capabilities, the L-708 is able to expand the range of adjustment to make setup easier and faster and require less precise fixturing. The L-708LD is a long distance version of the L-708 for applications up to 200 feet (61 M). The L-708 can be used out to 100 feet (30.5 M).

Both lasers have a mounting surface with a 1.2498 in. (31.74 mm) OD. The laser beam is centered to the mounting OD to within .0004 in. (0.010 mm).

High-pitch adjustment knobs adjust the pointing control of the laser beam down to .000007 in. /ft. (0.0006 mm/M). By turning each knob, an operator can adjust the vertical or horizontal angle of the laser beam to find the center of the reference bore ID.

Both lasers will operate for up to 8 hours on a battery pack with standard, replaceable 9-volt cells. An AC adapter is provided for continuous operation.


  • Crankshaft and camshaft line bores.
  • Cylinder straightness.
  • Deep bore straightness checks on parts.
  • Propeller shaft bearing bores.
  • Gearbox installation in new ships.
  • Stern tube alignment.


  • Visible laser beam with collimated 5 mm beam for L-708. L-708LD has collimated 10 mm beam.
  • Designed to fit into our A-514 Self-Centering Adapters to directly mount and center the laser in a bore.
    • A-514 Self-Centering Bore Adapters have adjustable legs to fit any bore diameter in the range of the A-514 adapters from 3.75 to 40 in (95 to 1,000 mm).  
    • Uses A-514GS Leg-Setting Gage to set adapter to nominal bore ID.
  • Portable, battery-operated, compact, and rugged design.
  • Built-in horizontal and vertical angular coarse and fine adjustments for quick alignment of laser beam to bore reference.
  • Long-range, high accuracy:
    • L-708 can be used up to 100 feet (30.5 m)
    • L-708LD can be used out to 200 feet (61 m)
  • Beam straightness of +/- .0001 in. (0.0025 mm) in 10 feet (3 m) or +/- .001 in. (0.025 mm) in 10 feet’ (30.5 m).
  • Readouts and targets provide real-time display of bore alignment values.
  • Wireless transmission of alignment data via 2.4GHz link to Bore9 Alignment Software.


See Drawing in Dimensions
1.6 lbs. (0.7 kilograms)
9V external battery / AC adapter
Beam Concentricity
Laser aperture ground concentric to within .0003 in. (0.008 mm). No adjustment
Angular Adjustment Resolution
Coarse: .0006 in/ft. (0.05 mm/m)Fine: .000007 in/ft. (0.0006 mm/m)
Angular Adjustment Range
Coarse: ± 1.0° (± .21 in/ft. or 17.5 mm/m)
Fine: ± 0.03° (± .007 in/ft. or 0.6 mm/m)
Operating Distance
L-708: Up to 100' (30.5 m)
L-708LD: Up to 200' (61 m)
Laser Beam Diameter
L-708: < 0.25 in./6.4 mm dia.
L-708LD: <0.38 in. (9.6 mm) dia.
Laser Type
Laser < 1 mW Cw, BRH Class 11. Blinking and Continuous Modes
Laser Wavelength
635 nanometers
Aluminum Flange. All mounting surfaces: 303 SS