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Subchapter 7. General Industry Safety Orders
Group 8. Points of Operation and Other Hazardous Parts of Machinery
Article 54. Scope and General Definitions

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§4186. Maintenance and Use of Point of Operation Tools and Guards.

(a) All saws, cutting tools, heads, shears, and knives that are part of any machine shall be kept sharp, properly set up, adjusted and firmly secured.

(b) All point of operation guards shall be properly set up, adjusted and maintained in safe and efficient working condition in conformance with Figure G-8 and Table G-3 or other guard configurations which will prevent the operator's hand from entering the point of operation.

(c) All repair work performed on metal forming and/or cutting machines, such as punch presses, press brakes, forming rolls, shears, power presses, forging presses and hammers, shall be made:

 (1) In accordance with the recommendation of the manufacturer(s), or 

 (2) In accordance with good engineering practice. 

Point of Operation Guarding

Figure G-8

 Explanation of Above Diagram: 

 This diagram shows the accepted safe openings between the bottom edge of a guard and feed table at various distances from the point of operation. 

 The minimum guarding line is 1/2-inch from the point of operation. The various openings are such that with average size hands, an operator's fingers will not reach the point of operation. 

 After installation of point of operation guards and before a job is released for operation, a check should be made to verify that the guard will prevent the operator's hands from reaching the point of operation. 

Table G-3

Distance of Opening                    
from Point ............ Maximum Width  
of Operation Hazard ... of Opening     
(Inches) .............. (Inches)       
1/2 to 1 1/2...........   1/4          
1 1/2 to 2 1/2.........   3/8          
2 1/2 to 3 1/2.........   1/2          
3 1/2 to 5 1/2.........   5/8          
5 1/2 to 6 1/2.........   3/4          
6 1/2 to 7 1/2.........   7/8          
7 1/2 to 12 1/2........ 1 1/4          
12 1/2 to 15 1/2....... 1 1/2          
15 1/2 to 17 1/2....... 1 7/8          
17 1/2 to 31 1/2....... 2 1/8          
 Refer to Table G-1 in Section 3944 for the maximum width of openings permitted in guards at various distances from the moving parts of power transmission equipment, prime movers, machines and machine parts. 

    Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.  

1. Repealer and new section filed 10-25-74; effective thirtieth day thereafter 
(Register 74, No. 43).

2. Amendment of subsection (b) and new Figure G-8 and Table G-3 filed 11-18-76;
effective thirtieth day thereafter (Register 76, No. 47).

3. New subsection (c) filed 4-28-81; effective thirtieth day thereafter 
(Register 81, No. 18).

4. Amendment of subsections (b), (c), Figure G-8 and Table G-3 filed 10-31-85;
effective thirtieth day thereafter (Register 85, No. 44).

5. Change without regulatory effect providing a more legible copy of Figure G-8
with no amendments filed 3-13-2000 pursuant to 
section 100, title 1,California Code of Regulations (Register 2000, No. 11).

6. Change without regulatory effect providing more legible illustration for
Figure G-8 filed 2-18-2009 pursuant to 
section 100, title 1, California Codeof Regulations (Register 2009, No. 8).

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