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| Subject | English | German |
| opt. | centre-to-centre pitch of adjacent fibres | regelmäßiger Mittenabstand benachbarter Fasern (the pitch determines the resolving power of a bundle when the fibre shape is not distorted) |
| opt. | fibre pitch | Mittenabstand der Fasern (centre-io-centre distance of adjacent fibres) |
| brit. | pitch fibre | Pechfaser |
| construct. | pitch fibre pipe | Bitumenzellulosefaserrohr |
| construct. | pitch fibre pipe | Bitumencellulosefaserrohr |
| brit. | pitch fibres | Pechfasern |
| industr., construct. | pitch-impregnated fibre | pechimprägnierte Faser |