Frequently Asked Questions
- How do I mount/secure a bushing?
- What are the recommended hole sizes for press-fits and slip-fits?
- What type of lubrication is used between the threads of matched sets?
- Can I alter or customize any of your standard items?
- Do you provide material certificates?
- What is the maximum allowable applied force on a screw?
How do I mount/secure a bushing?
A bushing can be mounted either using a press-fit or slip-fit. For a press-fit, the hole should be .0002"-.0003" smaller than the barrel diameter of the bushing. A slip fit requires a hole .0005"-.002" larger than the barrel diameter of the bushing (and adhesive to secure the bushing in place).
What are the recommended hole sizes for press-fits and slip-fits?
Below are the recommended hole sizes for our bushings (and matched set bushings):
TB187 & TSB187 series
Press-fit hole diameter: .2502"-.2503"
Slip-fit hole diameter: .2510"-.2525"
TB250 & TSB250 series
Press-fit hole diameter: .3122"-.3123"
Slip-fit hole diameter: .3130"-.3145"
TB3 & TBM3 series
Press-fit hole diameter: .1764"-.1765"
Slip-fit hole diameter: .1772"-.1787"
TB2 series
Press-fit hole diameter: .1553"-1554"
Slip-fit hole diameter: .1561"-.1576"
What type of lubrication is used between the threads of matched sets?
We use Apiezon M Silcone-Free High-Vacuum grease for lubrication. This is applied standard to all matched sets. If you do not want lubrication applied to your matched sets, please write "no grease" on the comments section when checking out.
Can I alter or customize any of your standard items?
Yes, we are a full service machine shop, and make everything in our New Jersey facility. You can send us a RFQ with any requests, or you can attach a drawing of your own and send it to info@kozakmicro.com. Once we receive your information, we will review it and send a quote as soon as we can.
Do you provide material certificates?
Yes, we will send you a copy of the applicable material certificate(s) if requested.
What is the maximum allowable applied force on a screw?
The list below shows the maximum applied axial forces that our screws (and matched sets) can manage before failure occurs. The maximum applied axial force is measured in two ways; first by measuring the force at which failure occurs when the screw is not moving (static), second by measuring the force at which failure occurs when the screw is moving/rotating (dynamic). Failure is characterized by material deformation where the screw is no longer able to turn (static), and when the screw seizes due to galling (dynamic).
Please keep in mind that these load ratings are under ideal conditions. The actual maximum load may be less than stated if other forces are present. Additionally, as the applied load increases, so does galling, so it is a good idea to keep applied loads lower to prevent excessive wear.
TS3 & TSBM3 Series:
0.25mm pitch: 350 lbf (1.55 kN) static (screw not rotating); 65 lbf (289 N) dynamic (screw is rotating)
0.20mm pitch: 280 lbf (1.24 kN) static (screw not rotating); 52 lbf (231 N) dynamic (screw is rotating)
0.10mm pitch: 135 lbf (0.60 kN) static (screw not rotating); 32 lbf (142 N) dynamic (screw is rotating)
0.05mm pitch: 70 lbf (0.31 kN) static (screw not rotating); 22 lbf (98 N) dynamic (screw is rotating)
TS187 & TSB187 Series:
100 TPI: 650 lbf (2.89 kN) static (screw not rotating); 110 lbf (489 N) dynamic (screw is rotating)
127 TPI: 511 lbf (2.27 kN) static (screw not rotating); 86 lbf (386 N) dynamic (screw is rotating)
200 TPI: 324 lbf (1.44 kN) static (screw not rotating); 55 lbf (248 N) dynamic (screw is rotating)
254 TPI: 266 lbf (1.18 kN) static (screw not rotating); 44 lbf (195 N) dynamic (screw is rotating)
TS250 & TSB250 Series:
80 TPI: 850 lbf (3.78 kN) static (screw not rotating); 130 lbf (584 N) dynamic (screw is rotating)
100 TPI: 680 lbf (3.02 kN) static (screw not rotating); 111 lbf (495 N) dynamic (screw is rotating)
127 TPI: 535 lbf (2.38 kN) static (screw not rotating); 87 lbf (390 N) dynamic (screw is rotating)
200 TPI: 339 lbf (1.51 kN) static (screw not rotating); 56 lbf (250 N) dynamic (screw is rotating)
254 TPI: 266 lbf (1.18 kN) static (screw not rotating); 45 lbf (200 N) dynamic (screw is rotating)
508 TPI: 130 lbf (0.58 kN) static (screw not rotating); 23 lbf (102 N) dynamic (screw is rotating)