GY 8300 Bayonet Type Back Plate For Taper Spindle Nose (DIN 55027)

Engineered for precision and durability, our Type 8300 Back Plates are designed specifically for mounting chucks onto Taper Spindle Noses. These Bayonet type back plates provide a rigid, high-accuracy interface between your machine spindle and work-holding equipment. Whether you are upgrading your current setup or outfitting a new lathe, these back plates ensure minimal runout and maximum stability for heavy-duty machining..

Key Features

  • A2 Spindle Compatibility: Designed to fit standard 4, 5, 6, 8, and 11 taper spindle noses.
  • High-Grade Construction: Manufactured from premium materials to withstand high rotational speeds and clamping forces.
  • Precision Machined: Features a pre-machined short taper and through-hole to reduce setup time and ensure perfect alignment.
  • Versatile Sizing: Available in diameters ranging from 160mm (6 ¼”) to 400mm (15 ¾”) to accommodate a wide variety of chuck sizes.
GY 8300 Model Numbers
Size (MM) Size (Inches) Short Taper Through Hole Order Code
160 6 ¼” 4 42 16401604
160 6 ¼” 5 42 16401605
200 8″ 4 50 16402004
200 8″ 5 50 16402005
200 8″ 6 50 16402006
200 8″ 8 50 16402008
250 10″ 4 55 16402504
250 10″ 5 65 16402505
250 10″ 6 65 16402506
250 10″ 8 65 16402508
315 12 ½” 6 85 16403156
315 12 ½” 8 85 16403158
315 12 ½” 11 85 164031511
400 15 ¾” 8 110 16404008
400 15 ¾” 11 110 164040011
Technical Specification
Spindle Nose 4 5 6
Size 160mm 200mm 250mm 160mm 200mm 250mm 200mm 250mm 315mm
A 160 200 250 160 200 250 200 250 315
B 112 112 112 135 135 135 170 170 170
C 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5
D 14.7 14.7 14.7 16.3 16.3 16.3 19.45 19.45 19.45
E M10 M10 M10 M10 M10 M10 M12 M12 M12
F 63.513 63.513 63.513 82.563 82.563 82.563 106.375 106.375 106.375
G 85 85 85 104.8 104.8 104.8 133.4 133.4 133.4
H 13 13 13 15 15 15 16 16 16
K (Min) 12 50 55 12 50 65 50 65 85
M 33 33 33 35 35 35 40 40 40
No. of ‘E’ Studs 4 4 4 4 4 4 4 4 4
Technical Specification
Spindle Nose 8 11
Size 200mm 250mm 315mm 400mm 315mm 400mm
A 220 250 315 400 315 400
B 220 220 220 220 290 290
C 8 8 8 8 10 10
D 24.25 24.25 24.25 24.25 29.4 29.4
E M16 M16 M16 M16 M20 M20
F 139.719 139.719 139.719 139.719 196.869 196.869
G 171.4 171.4 171.4 171.4 235 235
H 18 18 18 18 20 20
K (Min) 50 65 85 110 85 110
M 45 45 45 45 50 50
No. of ‘E’ Studs 4 4 4 4 6 6