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A superb range of gothic arch thread form lead screws that ensure smooth linear movement. The lead screws are manufactured from 304 or 303 Stainless Steel delivering high postional accuracy and excellent corrosion resistance. Available in diameters of 4mm, 6mm, 8mm, & 12mm with leads of 1 to 30mm makes the series ideal for a multitude of precision linear applications. Complimented by a range of matched precision plastic nuts, all the screws can be delivered with machined end journals that are ready to fit directly into an application.
MRH-A,B series : KSS products
Using a non reactive Polyamide type resin for the nut material gives an excellent coefficient of friction. The material is impregnated with a lubricating agent that allows the nut and screw to be used without lubrication if required. However, lubrication is advised to increase operational and longevity. Other nut materials are available on request.
MRH-BP2 series : KSS products
Using a non reactive Polyamide type resin for the nut material gives an excellent coefficient of friction. Backlash free nut designs can be supplied using a double nut design with a captivated wound spring between them providing a preload. Other nut materials are available on request. .
R-MSS (Y) series : NTN Corp. products
Using Bearee AS5000 plastic material for the nut enables a wide range of environmental application challenges to be overcome. Please note that high lead types (3 times as diameter.) are also available in this series.
|Shaft Dia. (mm)||Lead (mm)|
Note1 ) The numbers in each cell show pages in the catalogue. D105 and D109 are for backlash nut design type, D106 is for the antibacklash nut design.
Accuracy grade and Axial play
Accuracy grade of KSS Resin Lead Screws is based on Japanese Industry Standard Ct10. The tolerance on the specified travel is calculated by
following formula. Axial play is 0.05 to 0.10mm (except Backlash free type).
Tolerance on specified travel ep: ep =±𝓁u300 ×0.21 (mm)
𝓁u : Useful travel (mm)
|Shaft||Stainless Steel 304 or 303|
|Nut||MC nylon (MC703HL)|
Mitsubishi Chemical Advanced Materials
Note 1) Please refer to page D104 for Nut material suitable for special environment.
Note 2) Other nut materials are available on request.
Description of Run-out and location tolerance
Each part of run-out tolerance is based on Japanese Industry Standard Ct10 of Ball Screws.
Thread groove profile
The thread grooves are of a gothic arch design. This is basically the same as those used in the KSS Ball Screw ranges.
Mechanical efficiency of KSS Resin Lead Screws η(%) can be calculated by the following formula.
The expected “Mechanical efficiency” calculated from measurements is 20%-50%.
Generally, as the Lead increases, “Mechanical efficiency” tends to be high. Please use this number as a reference.
η = Fa×𝓁T × 2 ϖ ×100 (%)
Fa : Axial load(N)
𝓁 : Screw Lead(m)
T : Rotational torque(Nm)
FV value limits on use and endurance data
• FV value limits on use
For KSS Resin Lead Screws, the product of Axial Load and relative velocity of Screw surface is defined as FV, and this definition is reference to check if it is usable or not. Fig. D-11 is maximum FV which can be operated without lubricants in case of using Nut material MRH (Material : MC703HL). Applying lubricants will improve operational efficiency.
Fig. D-11 : FV value limits
Model : MRH0805 / Lubricant : None
◎ Stable operational conditions were maintained for the long term.
◯ Operation were good, but some wears were seen on the Nuts.
△ Operations became difficult in a relatively short time.
╳ Operations became difficult in the short time.
In case of FV<5(N·m/s), stable operations were maintained.
Operations under FV>10 (N·m/s), maintaining stability was difficult.
Axial Load should be treated more carefully as to upper limits
rather than relative speed.
• Endurance test data of Preloaded products(BP2 type)
Model : ø10mm、Lead = 6mm
Load : None
Speed : 1000rpm
Travel : 400mm(bi-directional)
Lubricant : None
Result : After running 100km, operation were good
Starting Torque monitor : see diagram below
The standard material of the nut is MC nylon(MC703HL), but we also provide with the following nut materials, detailed in the chart below.
Higher volume applications can take advantage of nuts manufactured by injection molding as well as a selection of materials.
Table D-12 ： Product performance comparison
|Operating environment||Standard environment||Standard environment||Standard environment||Special environment|
|Material||Polyamide resin type||Polyamide resin type||Polyamide resin type||Polyether|
ether ketone type
|Features||Balanced performance||Balanced performance||Balanced performance||Flame resistance,|
|Other||Good C of E||-||Good electrical|
Fig. D-13 ： Evaluation each material
2) Additional end-journal machining