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Spring Plungers

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Spring plungers are hollow grub screws with a captive spring loaded hardened ball protruding from one end.

They are commonly used in machine tool  indexing applications where a pre-defined positional stop is required.

We stock these black phosphated finish high tensile steel spring plungers with slot drive, from M3 to M10.

Other larger sizes are also available on request.

All prices include 20% VAT  Click here for details

Metric Spring Plungers
Slot drive, black phosphated finish

Thread O/A Length Screw Length Ball Dia Preload Max load MF Ref Pack Qty Pack Price You can enter/change the number of items on the order form
  mm mm mm N N        
M3 7.5 7 1.5 2 3 MF-SPM3 2 £3.84

10 £17.28

M4 9.8 9 2.5 6 12 MF-SPM4 2 £4.20

10 £18.90

M5 12.9 12 3 7 13 MF-SPM5 2 £4.50

10 £20.25

M6 15 14 3.5 9 16 MF-SPM6 2 £4.80

10 £21.60

M8 17.5 16 5 20 35 MF-SPM8 2 £5.34

10 £24.03

M10 21 19 6 25 45 MF-SPM10 2 £6.24

10 £28.08


Thread Threads are all metric and coarse pitch. Click here for more thread data
O/A Length The length of the screw plus the ball with no compression
Screw Length The length of the screw section only
Preload The force required to start to depress the ball (in Newtons). 
Max load The force required to fully press the ball into the screw body.

All force figures are approximate and will vary with usage

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