SDC Clean-Bolt Series

It is only one proven technology in the world.

No lubricant grease or oil, Ag (silver) plating nor dry film lubricant are required to prevent galling.
Stainless steel fasteners are particularly susceptible to thread galling.
During the tightening of the fastener, pressure builds between the contacting and sliding thread surfaces and breaks down the protective oxide coatings. With the absence of the protective oxide, interface metal high points shear or lock together. In the extreme, galling leads to seizing and welding.
SDC Clean bolt is the most effective fastener to withstand wear and galling, while meeting corrosion resistance, when there is need for cleanness as in semiconductor devices or sanitation as in food or pharmaceutical processing, which precludes the use of lubricants.
Hex Socket Cap Screw
Hex Bolt, Hex Nut

Applicable Industries

Semiconductor, FPD and Solar Panel
Pharmaceutical and Cosmetic Chemicals
Food and Beverage etc...
Hard disk drive

Features and Benefits

No risk of contamination generated by lubricant, coating and plating
Extends life of frequently screwed fastener and reduces damage on equipments fastened
Eliminates idle time of maintenance and assembling process by "galling" fastener after heating and cryogenic process cycles (recommended to use under 300 ºC or 572 ºF)
Maintains good corrosion resistant and nonmagnetic properties
Available in a wide range of fastener type and size
Other materials are available upon request


Material: S31603(316L)
There is no crack nor peeled in case
hardened layer despite the base mate -
rial was plastically deformed with high
load impact. The case hardened layer
followed the base material deformation.

Thread Anti-Galling During Tightening

SDC Clean Bolt

Product Information

SS316 (S31600) or SS316L (S31603)
(Other materials are available upon request)
Surface Treatment:
SDC plasma surface-hardening process
Options (available upon request):
Vent hole for vacuum chamber
Extra precision cleaning and packaging for clean room
ANSI, DIN and other standards
Non standard customer designed parts according to engineering drawing
Item Description in Metric:
Hex Bolt, Hex Nut
Hex Socket Cap Screw
Hex Socket Set Screw