GY 4200 Self Centering Chucks

Double Guide Standard Jaws With A2 PlateType

Upgrade your machining precision with Self-Centering Chucks, engineered for consistent quality and a longer service life. Engineered with a double guide system, this chuck provides superior stability and gripping accuracy for a wide range of turning applications.

Key Features

Construction & Material Specifications
Our self-centering lathe chucks are engineered for high-precision performance and long-term industrial use.Equipped with A2 Type Plates for specialized spindle noses.
    • Premium Chuck Bodies: Available in three configurations to match your RPM and durability requirements:
      • High-Tensile Cast Iron: Alloyed with Chromium, Nickel, and Manganese for superior wear resistance (Hardness: 210 BHN).
      • SG Iron (500/7 Grade): Designed for high-speed operations and extended service life (Hardness: 210 BHN).
      • Nickel-Chrome Alloy Steel: Features hardened and ground jaw ways for maximum accuracy and high-RPM stability (Hardness: 45 HRC).
    • Generous Through-Hole: Designed with large bore diameters to accommodate bar stock and long workpieces easily.
    • Precision Scroll: Drop-forged from high-tensile alloy steel, precision machined, and hardened to 35 HRC for consistent centering accuracy.
    • Hardened Jaws: Constructed from low-carbon alloy steel, case-hardened to 62 HRC, and ground on both sides to ensure a smooth fit and perfect pitch.
    • Durable Pinions: Made from specialized alloy steel and case-hardened to 50 HRC for high torque resistance.
    • Included Accessories: Every chuck includes a high-strength operating key and a full set of mounting bolts (3, 4, or 6 pieces).
    • Precision Jaw Systems: Available in both 3-jaw and 4-jaw configurations to provide superior grip and centering accuracy.
    • Extensive Size Range: We offer a comprehensive selection of sizes, from compact 80mm (5″) units up to heavy-duty 400mm (15.3/4″) chucks.

Accessories Included

Every Chuck comes ready for immediate setup with a comprehensive set of standard accessories:
  • 1 Set of Outside Hard Solid Jaws
  • 1 Set of Inside Hard Solid Jaws
  • 1 Pc. Chuck Operating Key
  • 1 Set of Mounting Bolts
Looking for more flexibility? Optional accessories including Soft Solid Jaws. are also available to customize your setup.

Applications

Self Centring Lathe Chucks are geared scroll chucks for use on lathes, rotary tables, dividing heads, milling machines etc.
GY 4200 Model Numbers
Chuck Size (MM) Chuck Size (Inches) Short Taper Through Hole C.I. Body S.G. Body Steel Body
3 Jaw 4 Jaw 3 Jaw 4 Jaw 3 Jaw 4 Jaw
125 5″ A2-4 32 12231254 12241254 22231254 22241254 32231254 32241254
160 6 1/4″ A2-4 42 12231604 12241604 22231604 22241604 32231604 32241604
160 6 1/4″ A2-5 42 12231605 12241605 22231605 22241605 32231605 32241605
200 8″ A2-4 55 12232004 12242004 22232004 22242004 32232004 32242004
200 8″ A2-5 55 12232005 12242005 22232005 22242005 32232005 32242005
200 8″ A2-6 55 12232006 12242006 22232006 22242006 32232006 32242006
250 10″ A2-6 76 12232506 12242506 22232506 22242506 32232506 32242506
250 10″ A2-8 76 12232508 12242508 22232508 22242508 32232508 32242508
315 12 1/2″ A2-6 105 12233156 12243156 22233156 22243156 32233156 32243156
315 12 1/2″ A2-8 105 12233158 12243158 22233158 22243158 32233158 32243158
400 15 3/4″ A2-8 136 12234008 12244008 22234008 22244008 32234008 32244008
400 15 3/4″ A2-11 136 122340011 122440011 222340011 222440011 322340011 322440011
Technical Specification
Size 125mm 160mm 200mm
Taper Nose A2-4 A2-4 A2-5 A2-4 A2-5 A2-6
A 125 160 160 200 200 200
B 63.513 63.513 82.563 63.513 82.563 106.375
C 32 42 42 55 55 55
D 66 75 75 83 83 83
E 20 30 30 29 29 29
F 21 22 23 22 23 26
G 51 70 70 85 85 85
H 13 13 15 13 15 16
J M 8 M 10 M 10 M 10 M 10 M 10
P.C.D K 108 140 140 176 176 176
Tol. on K ±0.25 ±0.30 ±0.30 ±0.30 ±0.30 ±0.30
L 5 5 6 5 6 8
M 108 108 133 108 133 165
N 82.6 82.6 104.8 82.6 104.8 133.4
P 12 12 12 12 12 14
R 14.7 14.7 16.3 14.7 16.3 19.45
S 6.5 6.5 6.5 6.5 6.5 6.5
Size of Sq. Key 9 11 11 11 11 11
Technical Specification
Size 250mm 315mm 400mm
Taper Nose A2-6 A2-8 A2-6 A2-8 A2-8 A2-11
A 250 250 315 315 400 400
B 106.375 139.719 106.375 139.719 139.719 196.869
C 76 76 105 105 136 136
D 96 96 110 110 120 120
E 34 34 43 43 55 55
F 28 30 32 32 34 36
G 105 105 125 125 145 145
H 16 18 16 18 18 20
J M 12 M 12 M 16 M 16 M 16 M 16
P.C.D K 224 224 286 286 362 362
Tol. on K ±0.35 ±0.35 ±0.40 ±0.40 ±0.40 ±0.40
L 8 8 8 8 8 10
M 165 210 165 210 210 280
N 133.4 171.4 133.4 171.4 171.4 235
P 14 18 14 18 20 20
R 19.45 24.2 19.45 24.2 24.2 29.4
S 6.5 8 6.5 8 8 10
Size of Sq. Key 14 14 14 14 17 17