Is a special/unique fastener needed to secure a machine guard?

Generally speaking, OSHA requires that guards be securely fastened and not be able to be inadvertently dislodged or removed. However, it depends on the specific standard that applies as to what the exact wording is in some cases the OSHA regulation does not address the issue).

One prominent requirement is in 1910.219(m) requiring that guards on mechanical power transmission being securely fastened.

OSHA does further address this issue in a May 07, 2006, Letter of Interpretation (LOI) which states “the guards may be fastened by any secure method that prevents the guard from being inadvertently dislodged or removed, including, but not limited to, such means as screws, bolts, wing nuts and lock fasteners. OSHA would allow guards that could be easily removed to allow maintenance or repair activities in the most efficient manner, provided that the guard can be attached securely in place to protect employees once the maintenance or repair activities are completed.”

Also, in an August 25, 2006 LOI, OSHA says that “with respect to performance–oriented machine guarding requirements, guard design and construction must be of such design and strength to protect workers from the machine hazards. Guards must be affixed to the machine, where possible, and they may be fastened by any method (e.g., bolts) that prevents the guard from being inadvertently dislodged or removed. See 1910.212(a)(2) and 1910.219(m)(1).”

And, in OSHA publication, “Safeguarding Equipment and Protecting Workers from Amputations,” the agency says the following:

“Guards usually are preferable to other control methods because they are physical barriers that enclose dangerous machine parts and prevent employee contact with them. To be effective, guards must be strong and fastened by any secure method that prevents the guard from being inadvertently dislodged or removed. Guards typically are designed with screws, bolts and lock fasteners and usually a tool is necessary to unfasten and remove them. Generally, guards are designed not to obstruct the operator’s view or to prevent employees from doing a job.” [emphasis added]