Kanggo nambah resistance teyeng lan mréntahaké estetis saka knurled ngawut-awut spring sirah, padha biasane rampung karo macem-macem lapisan lumahing. Lapisan umum kalebu seng plating (transparan, kuning utawa ireng kromat), electroless nikel plating, Geomet (seng flake) coating, lan stainless steel passivation.
Nalika milih lapisan, kudu digarap karo bahan sekrup lan desain knurled. Lapisan ora bisa mungkasi bagean knurled saka nresep menyang materi, lan iku kudu ora kekacoan karo carane spring washer dianggo yen wis Applied.
Sampeyan bisa njaluk sekrup spring kepala knurled ing ukuran standar metrik lan kekaisaran. Pangukuran utama sing sampeyan kudu ngerti yaiku:
Ukuran benang (kaya M3 nganti M10) lan pitch
Total dawa meneng
Bentuk sirah (biasane pan utawa hex)
Ukuran bit knurled (diameter lan dawa)
Ukuran spring washer (diameter njaba lan njero, kekandelan)
| Mon | 440 | 632 | 832 | 032 | 0420 |
| P | 40 | 32 | 32 | 32 | 20 |
| d1 | #4 | #6 | #8 | #10 | 1/4 |
| dk maks | 0.432 | 0.462 | 0.522 | 0.522 | 0.589 |
| dk min | 0.404 | 0.443 | 0.502 | 0.502 | 0.569 |
| h maks | 0.043 | 0.075 | 0.075 | 0.075 | 0.075 |
| h min | 0.035 | 0.067 | 0.067 | 0.067 | 0.067 |
| k | 0.445 | 0.602 | 0.614 | 0.614 | 0.76 |
| Ora. | 1 | 2 | 2 | 2 | 3 |
| d2 maks | 0.186 | 0.212 | 0.265 | 0.265 | 0.322 |