Helical螺纹护套按尺寸分类为：公制和美制。
Helical螺纹护套按材料分类为：304不锈钢（美国产不锈钢），Inconel X750合金，磷青铜合金，钛合金，Nitronic60TM。
Helical螺纹护套按功能分类为：普通型和螺栓锁紧型。
Helical螺纹护套按镀（涂）层分类为：无镀（涂）层，干性润滑剂涂层（二硫化钼），镀镉，Primer FreeTM，镀银。
Helical螺纹护套依据的技术标准：

●化学成分和物理性能符合AS7245，ASME SA-497，AS7246标准。
●符合军事标准MS21208，NASM21209，NASM122076至NASM12275，NASM124651至NASM124850，MS9018和军事规格NASM8846。
●符合航空标准MA3279，MA3280，MA3281，MA3329，MA3330，MA3331，MA1565。

●符合ISO9001-ISO/TS 16949标准。

        Helical® ins erts are precision formed screw thread coils of stainless steel wire having a diamond shaped cross section.

        When they are installed into Helical® tapped holes, they provide permanent conventional 60' internal screw threads that accommodate any standard bolt or screw.

        All related tooling such as STI Taps, hand and power installation tools, gages and tang break-off tools are also available. Typical Applications would include: Automotive,Communication, Aerospace, Military and the Defense industries