Astro Pneumatic 78825 Master Front Wheel Drive Bearing Adapter Kit, XL Grade 8, Drive Bolt, 25-Piece,

• The Astro Pneumatic 78825 XL Grade 8 Drive Bolt 25-Piece Master Front Wheel Drive Bearing Adapter Kit is a front wheel drive bearing puller and installer set that uses a heavy-duty 7/8" Grade 8 drive bolt to retain knuckle alignment while servicing bearings.
• Features:
  • Includes a 7/8" (1.25" hex) Grade 8 drive bolt for enhanced strength over standard tooling.
  • Black phosphate finish on sleeves and adapters for improved corrosion resistance.
  • Allows replacing or installing wheel bearings without moving strut or knuckle alignment.
  • Master set covers wide range of applications using multiple sleeve sizes, bushing ranges, and plate adapters.
• Includes:
  • Grade 8 drive bolt 7/8" D (1.25" hex)
  • Sleeves with outside diameters: 2.18", 2.50", 2.62", 2.78", 2.82", 2.88", 2.90", 2.96", 3.05", 3.21", 3.28", 3.48"
  • Step sleeves / plate adapters: 3.00" O.D. x 2.50" long; 3.25" O.D. x 2.53" long; 3.63" O.D. x 2.53" long; 4.00" O.D. x 2.53" long; 3.25" O.D. x 2.72" (step); 4.00" O.D. x 3.20" (step)
  • Sliding screws: Grade 8, 7.5" long x 0.875" diameter x 1.25" hex
  • Nut: 3.00" long x 0.875" ID x 1.25" hex internal size
  • Washer: 1.50" O.D. washer for use under nut on bolt face
• Specifications:
  • Manufacturer: Astro Pneumatic
  • Part Number: 78825
  • Drive Bolt: 7/8" D (1.25" hex), Grade 8
  • Sleeve Coverage Range (O.D.): 2.18" to 3.48" (12 sizes)
  • Step / Adapter Plates: six configurations for larger diameters
  • Sliding Screw Size: 7.50" x 0.875" dia x 1.25" hex
  • Nut: 3.00" length x 0.875" I.D. x 1.25" external hex
  • Washer: 1.50" outer diameter washer for drive bolt assembly
  • Finish: Black phosphate coating on sleeves and adapters
  • System Compatibility: designed for pulling and installing front wheel drive bearings while keeping strut and knuckle in proper alignment during service
• The Astro Pneumatic 78825 XL can also be referred to as master bearing adapter kit 78825, XL grade 8 drive bolt bearing puller set, Astro 25-piece FWD bearing press kit, 78825 bearing adapter kit, and front wheel drive bearing installer kit.

Astro Pneumatic manufactures professional air tools and shop equipment, including the ONYX series of compact impact wrenches engineered for high torque and accessibility in cramped applications.

Q: What sleeve sizes does the kit support?
A: It includes sleeves from 2.18" up to 3.48" outer diameter, plus step/adapter plates for larger sizes.

Q: Why use a Grade 8 drive bolt?
A: The 7/8" Grade 8 drive bolt is significantly stronger than typical bolts, improving fatigue life and reducing thread slip under high load.

Q: Does the kit preserve wheel alignment during bearing service?
A: Yes, Its design allows removal and installation without disturbing the strut, steering knuckle, or alignment geometry.