A 3J Collet is a heavy-duty workholding collet used in automatic lathes, capstan lathes, turret lathes, and SPM machines. It delivers strong gripping force, durable construction, and reliable performance for medium-diameter, repetitive production jobs, making it well suited for Indian machine shop applications requiring consistent and rugged holding.
A 3J Collet is a heavy-duty Workholding collet commonly used in automatic lathes, capstan lathes, turret lathes, and SPM machines.
It is designed for strong gripping force, durability, and reliable performance in medium-diameter, repetitive production jobs.
3J collets are widely used in Indian machine shops where robust construction and consistent holding are required.
Key Features
Strong and uniform gripping force
Suitable for continuous mass production
Simple, rugged design
Long service life
Easy installation and replacement
Available in round, hex, square & step types
📐 3J Collet – Exact Dimension Details
|
Parameter |
Typical Value / Range |
|
Collet Type |
3J Collet |
|
Outer Diameter (OD) |
30 – 55 mm |
|
Overall Length (L) |
50 – 90 mm |
|
Clamping Range |
4 – 32 mm |
|
Nose Angle |
30° |
|
Grip Type |
External gripping |
|
Accuracy (TIR) |
≤ 0.01 mm |
📌 Exact OD, length, and bore are manufactured as per machine spindle and job requirement.
Construction Details
Material: Spring Steel
Heat Treatment: Hardened & tempered
Hardness: 58 HRC
Slots: Precision slit pattern for uniform grip
Finish: Bore ground / semi-ground as required
Types of 3J Collets
Round 3J Collet
Hex 3J Collet
Square 3J Collet
Step 3J Collet
Special profile 3J Collet
Applications
Automatic lathes
Capstan & turret lathes
SPM machines
Fasteners, shafts, bushes
Brass, MS & aluminum components
Supply Options
Standard & custom sizes
Hardened or soft (machinable)
Made as per drawing or sample
Suitable for manual & semi-automatic machines
Export-quality packing available
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