304带内外环金属缠绕垫
用金属薄板压制成同心的波纹形状，由波纹提供机械支撑，其回弹性能根据采用的形式、金属厚度、波纹间距及波纹高度来决定。再根据需要加贴软质密封层材料，使其具有更好的压缩回弹性能，可选择柔性石墨、PTFE、无石棉板或其它一些软金属，粘贴在垫片的二面，利用软性覆盖层的密封性以及金属的强度、弹性好的优点，以达到更好的密封效果.
304带内外环金属缠绕垫
下表是缠绕垫片直径公差（即用于法兰的名义管道直径）：
DIN (mm)ANSI B16.5
BS1560 (mm)
Mss sp-44API 605公差内环内径
垫片内径<=600<=24">=26" and <=34"±0.5>600 and <=800>24" and <=34">=36" and <=60"±0.9>800 and <=1600>34" and <=60" ±1.3>1600>60" ±1.6垫片外径<=600<=24"<=24"±0.9>600 and <=16000>24" and <=60">24" and <=60"±1.81600>60" ±2.2外环外径 >=1/2" and <=60"±0.9<=600<=24" 0-1.0>600 and <=1000>24" and <=34" 0-1.8>1000 and <=1600">34" and <=60 0-2.2