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757 MAINTENANCE MANUAL
ST878D TOOL ASSEMBLY

ST878D TOOL ASSEMBLY

Preset Pressures (PSI) for the Cherry G-85 Lockbolt Gun with ST878D Presetting Tool Assembly (BACS13AP Sleeves) Figure 818 (Sheet 1)
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MAINTENANCE MANUAL

RECOMMENDED AIR PRESSURE (PSI) TUBE WALL
ALUMINUM STEELTOOL NO.
SIZE THICKNESS 6061-T6 AISI 304-1/8 HARD
3/16  0.020-0.035  ST878D-3-020 ST878D-3-035  22.5  30.0 
1/4  0.020-0.035  ST878D-4-035 ST878D-4-020  27.5  40.0 
5/16  0.020-0.035  ST878D-5-035 ST878D-5-020  30.0  40.0 
3/8  0.020-0.035  ST878D-6-035 ST878D-6-020  30.0  52.5 
1/2  0.028-0.035  ST878D-8-035 ST878D-8-028  42.5  75.0 
5/8  0.028-0.083  ST878D-10-083 ST878D-10-028  50.0  80.0 
3/4  0.020-0.049  ST878D-12-049 ST878D-12-020  52.5  85.0 

NOTE: ALL DIMENSIONS ARE IN INCHES.
Preset Pressures (PSI) for the Cherry G-85 Lockbolt Gun
with ST878D Presetting Tool Assembly (BACS13AP Sleeves)
Figure 818 (Sheet 2)

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MAINTENANCE MANUAL

AFTER PRESET BY HAND

Preset by Hand with Preset Tool ST879A
Figure 819

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SLEEVE BOW

TUBE END DEFORMATION
MAKE SURE THE ID DOES NOT DECREASE MORE THAN 0.005 INCH AFTER PRESET OR 0.015 INCH AFTER YOU TIGHTEN MANY TIMES.

Properties of Preset BACS13AP Flareless Sleeve/Tube End
Figure 820

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MAINTENANCE MANUAL

NOTE: ALL DIMENSIONS ARE IN INCHES.
HAND PRESETTING FLARELESS FITTINGS - NO MANDREL
(STEEL TUBING)
TABLE A

ST879A). WHEN IN DOUBT, MAKE A TEST PRESET TO MAKE SURE THE RING CUT MINIMUM DEPTH IS 0.002 INCH.

MEASURE DISPLACEMENT FROM THE POINT WHERE THE FITTING, SLEEVE, AND NUT ARE FIRMLY HAND-TIGHTENED, AND A WRENCH IS NECESSARY TO FURTHER TIGHTEN.
APPLY TORQUE, LOOSEN, AND APPLY INDICATED TORQUE THREE TIMES.
Displacement Turns and Torque Values for Hand Preset of Flareless Sleeves
Figure 821

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MAINTENANCE MANUAL

H-Coupling Installation
Figure 822

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