How To Create a No.4 Stainless Steel Finish

 

 

 

 

 

 

 

# 4 Finish Stainless Steel is the workhorse of the light fabrication industry. This general-purpose finish is widely used for restaurant and kitchen equipment, storefronts, handrails, food processing and dairy equipment. No. 4 is the easiest of the stainless finishes to maintain. Depending on the requirements of the application, the final finish can be anywhere between 120 and 320 grit.  Higher grit numbers produce finer polishing lines and more reflective finishes

 

 

Recommended steps for creating or blending a #4 finish on stainless steel.

 

 

Step #1 LEVELING THE WELD 

 

  •  Preferred’s Firestorm Fiber Sanding Disc – 60 grit (7 x 7/8″ arbor hole 60 Grit #37529*) use with 7″ medium back-up pad #50410.

 

  Or

 

  •  Premium Zirc Flap Disc – 60 grit (4-1/2 x 7/8 #10625-FF)

 

 Tip: Use 7″ grinder if possible. (The grind lines from 7″ diameter discs are easier to blend than small radius grind lines left by 4-1/2 or 5″ diameter discs.) Align the grind line scratches with the grain line direction of the original stock. (Perpendicular scratches are more difficult to blend while parallel scratches are easier to blend.)

 

 *Made with our original Firestorm ceramic grain for fast cut and long life. Includes a grinding aid for cooler running temperatures and less loading.

 

 

Step #2 SETTING THE GRAIN – to remove circular grind lines from step #1

 

  •  Preferred’s Firestorm abrasive sanding belt 120 grit (3-1/2 x 15-1/2″ 120 grit #70696-C3*) Note: mount on inflatable rubber sanding drum that is available from other sources (we recommend Dynabrade 5″ dia. x 3-1/2 wide.

 

Or

 

  •  Mounted Flap Wheel – 120 grit (3 x 1 x 1/4 Shank #11393)

 

Tip: It is best to move the tool in an elliptical motion rather than straight back and forth to avoid noticeable finishing lines. Stay as close as possible to the weld area to minimize the time spent on final blending.

 

*Made with our original Firestorm ceramic grain for fast cut and long life. Includes a grinding aid for cooler running temperatures and less loading.

 

 

 

Step #3 FINAL FINISHING

 

 

  • Preferred’s Surface Conditioning Belt (A-Med) (3-1/2 x 15-1/2″ A-Med #53789)
    Note: mount on inflatable rubber sanding drum that is available from other sources (we recommend Dynabrade 5″ dia. x 3-1/2″ wide)

 

 

 

Step #4 FINAL BLENDING / TOUCH-UP

 

  • Preferred’s Black Flex-N-Finish Hand Pad 6 x 9 (#07446)

 

Tip: Use these flexible hand pads with a sanding block for final blending and touch-up.