Surface Roughness of Stainless Steel Sanitary Tubing

Table of Sanitary Tubing Surface Roughness and Ra


Polish Grade Comparison
Buffing Type

(Emery Size or Grit Size)

Ra Rmax AARH Machining Mark
60# 3_2a 12.5s 125 **
180# 1.6a 6.3s 63 ***
220# 1.2a 4.8s 48 ***
250# 0.8a 3.2s 32 ***
300# 0.4a 1.6s 16 ***
350# 0J5a 1.0s 10 ***
400# 0.2a 0.8s 8 ****
600# 0.1a 0.4s 4 ****

The reason why sanitary tubing is used in food, gas and other fluid pipeline engineering is mainly related to the external roughness (finishness) of its surface.

sanitary tubings

The characteristics of most sanitary fittings: bright appearance, smooth inner hole, inner and outer surface roughness standard Ra 0.8 Micron.

1. Control caliber: DIN standard (DN10-DN150), 3A / IDF standard (1/2 “-12”), ISO standard (diameter from 12.7-319.3);

2. International industrial standards: DIN, ISO, SMS, 3A, IDF, etc .;

3. Product material: stainless steel 304, 304, 316, 316L;

4. Quality and use: Used for internal and external polishing equipment to achieve surface precision requirements; suitable for dairy, food, beer, beverage, pharmaceutical, cosmetics and other industrial fields;

5. Applicable medium: water, oil, gas and some corrosive liquids;

6. Product features: beautiful appearance, smooth surface, acid and alkali resistance, anti-corrosion, strong texture performance.

7. Product quality: Comply with export and nationally enforced product high-pressure pipe product standards