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JM71 SC Stright shank collets

JM71 straight handle clamp spring, also known as SC strong tube clamp, is a needle roller type strong milling chuck matched with elastic clamp sleeve. It is a standard model of the original factory in China and is suitable for milling machines, machining centers MT Mohs cone, 7:24 cone handle, R8, ISO30/40 tool holder. It focuses on high clamping force and high concentricity, and is suitable for heavy cutting milling, drilling, and boring processing.

Material: 65Mn elastic manganese steel, quenched HRC44-48, with long-lasting elasticity and resistance to cracking

Accuracy: Regular 0.015mm, Precision 0.01mm

Structure: 3-petal open elastic groove, straight handle outer circle, compatible with JM71 series milling clamp body

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Order NO.	D (mm)	d (mm)	L (mm)
JM7112	16	4–12	45
JM7116	22	4–16	55
JM7116A	20	4–16	50
JM7120	25	4–20	60
JM7125	32	4–25	65
JM7132	42	6–32	80
JM7132A	40	6–32	80

Matching tool holder and applicable machine tool

1. Supporting tool holders: MT3-JM71, MT4-JM71, BT40-JM71, R8-JM71, ISO30-JM71 needle rolling milling chuck

2. Applicable equipment: vertical milling machine, turret milling machine, machining center, rocker drill

3. Processing scenario: Strong clamping of end mills, drill bits, reamers, and taps to prevent slipping

Advantage

1. With the locking structure of the rolling needle, the clamping force is much greater than that of ordinary ER cylinder clamps, and the tool will not loosen during heavy cutting

2. Straight handle outer circle contact, uniform force, longer service life

3. The specifications cover 4-32mm, and conventional cutting tools are fully covered

FAQ:
Q1: What sizes are available?
A: SC16, SC20, SC25, SC32 and SC42. Clamping range covers 4-12mm to 6-32mm.

Q2: What material and hardness?
A: 65Mn special elastic steel, HRC44-48.

Q3: What is the runout accuracy?
A: Standard runout is 0.015mm.

Q4: Which tool holders are compatible?
A: BT40, BT50, DIN69871 (SK40/SK50) and DIN2080 NT holders.

Q5: Is OEM available?
A: Yes. OEM customization is supported. Standard MOQ is 10 pieces.