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Molly Thread Jack Nut Inserts
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Molly Thread Jack Nut Inserts

Molly Jack inserts – Molly Jack or jack nut inserts are specifically designed for use with thin or brittle materials. They have four ribs instead of a solid body and are designed to collapse on the blind side to form a permanent, reusable threaded insert. They are available in steel, brass, and coated steel and can be installed by hand.
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Jack nut or Molly threaded inserts are an economical type of blind fastener typically used in assembly line applications. They are made of thin, soft, or brittle materials. When tightened, the legs collapse on the blind side of the parent material, leaving a firm, reusable threaded insert.

jack (103)

  • Fastens in blind holes

  • Won't distort soft or brittle materials

  • Not hole diameter sensitive

  • One-step installation with manual or pneumatic tools

  • Fastens securely despite burrs & uneven substrates 

  • Suitable for wide grip range


jack nut drawing

Thread Size

Grip Range

L

Hole Dia.

D

T

d

By inch

6-32

0-0.197"

0.67

0.32-0.33

0.47

0.06

0.32

6-32

0.197-0.394"

0.86

0.32-0.33

0.47

0.06

0.32

10-24

0-0.197"

0.7

0.38-0.40

0.55

0.06

0.38

10-32

0-0.197"

0.7

0.38-0.40

0.55

0.06

0.38

10-24

0.197-0.394"

0.9

0.38-0.40

0.55

0.06

0.38

10-32

0.197-0.394"

0.9

0.38-0.40

0.55

0.06

0.38

1/4-20

0-0.197"

0.7

0.47-0.48

0.63

0.06

0.47

1/4-20

0.197-0.394"

0.9

0.47-0.48

0.63

0.06

0.47

Thread Size

Grip Range

L

Hole Dia.

D

T

d

METRIC

M4X0.7

0-5MM

17

8.0

12

1.6

8

M4X0.7

5-10MM

22

8.0

12

1.6

8

M5X0.8

0-5MM

18

10.0

13.9

1.6

10

M5X0.8

5-10MM

23

10.0

13.9

1.6

10

M6X1.0

0-5MM

18

12.0

16

1.6

12

M6X1.0

5-10MM

23

12.0

16

1.6

12

M8X1.25

0-5MM

19

15.0

18

1.8

15

M8X1.25

5-8MM

24

15.0

18

1.8

15



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