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3-781-2120 - 3 Jaw, 21", Lg Bore, Power Chuck, A2-20

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3 Jaw, 21", Lg Bore, Power Chuck, A2-20
Workholding/Power Lathe Chucks/Large Bore Precision Power Lathe Chucks & Accessories/3-Jaw Large Bore, A2 Mount
3 Jaw, 21", Lg Bore, Power Chuck, A2-20
Item #: 3-781-2120
3 Jaw, 21" (530 mm) Diameter, A2-20, High Speed, Hydraulic, Power, Lathe Chuck, Large Bore, 5.5118” Through Hole, Drawbar, Max Gripping Force 234(23861) N(kgf), 3mm x 60 Serrated Jaw Interface, 84mm to 530mm Jaw Capacity, 1,700 RPM, Steel Body. The chuck includes one Blank Draw Nut. TMX offers a Draw Nut Threading Service to machine the Blank Nut to fit your machine specifications.

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Item Number: 3-781-2120

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images/3-781_back1.jpgimages/3-781_back2.jpgimages/3-781-0650_front.jpg
Chuck Size in 21
Spindle Nose A2-20
Thru Hole in(mm) 5.512 (140)
Jaw Stroke in(mm) 0.417 (10.6)
Plunger Stroke in(mm) 0.906 (23)
Gripping Dia Max in(mm) 20.866 (530)
Gripping Dia Min in(mm) 3.307 (84)
Max Permissible Input Force lbf(kgf) 20189.4 (9177)
Max Gripping Force lbf(kgf) 52494.2 (23861)
Max Speed RPM 1700
Weight lb (kg) 541.2 (246)
Moment of Inertia lb*ft2 7.5782
A in(mm) 20.866 (530)
B in(mm) 6.339 (161)
C in(mm) 14.961 (380)
D in(mm) 16.251 (412.775)
E in(mm) 1.063 (27)
F in(mm) 0.236 (6)
G in(mm) 13 (330.2)
H in(mm) 13 (330.2)
J in(mm) 5.512 (140)
K 6 - M22
L in(mm) 1.339 (34)
M in(mm) 2.362 (60)
N max in(mm) 3.878 (98.5)
N min in(mm) 3.669 (93.2)
O max in(mm) 3.445 (87.5)
O min in(mm) 0.846 (21.5)
P max in(mm) 1.496 (38)
P min in(mm) 0.591 (15)
Q in(mm) 2.559 (65)
R in(mm) 0.984 (25)
S in(mm) 1.535 (39)
T in(mm) 0.197 (5)
U max M155x3.0
V 3-M12
W in 6.535 (166)
X in 3.15 (80)
Y in 2.874 (73)
Z in 7.087 (180)
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