Song: "Harden My Heart"
Artist: Quarterflash
Peak position on the Cashbox Singles chart: #4
Number of weeks on the Cashbox Singles chart: 24
Weekly data:
| Week ending | Rank | Title | Artist | Label |
|---|---|---|---|---|
| October 17, 1981 | 80 | Harden My Heart | Quarterflash | Geffen 49824 |
| October 24, 1981 | 60 | Harden My Heart | Quarterflash | Geffen 49824 |
| October 31, 1981 | 46 | Harden My Heart | Quarterflash | Geffen 49824 |
| November 7, 1981 | 36 | Harden My Heart | Quarterflash | Geffen 49824 |
| November 14, 1981 | 29 | Harden My Heart | Quarterflash | Geffen 49824 |
| November 21, 1981 | 23 | Harden My Heart | Quarterflash | Geffen 49824 |
| November 28, 1981 | 18 | Harden My Heart | Quarterflash | Geffen 49824 |
| December 5, 1981 | 14 | Harden My Heart | Quarterflash | Geffen 49824 |
| December 12, 1981 | 12 | Harden My Heart | Quarterflash | Geffen 49824 |
| December 19, 1981 | 10 | Harden My Heart | Quarterflash | Geffen 49824 |
| December 26, 1981 | 9 | Harden My Heart | Quarterflash | Geffen 49824 |
| January 2, 1982 | 9 | Harden My Heart | Quarterflash | Geffen 49824 |
| January 9, 1982 | 9 | Harden My Heart | Quarterflash | Geffen 49824 |
| January 16, 1982 | 7 | Harden My Heart | Quarterflash | Geffen 49824 |
| January 23, 1982 | 6 | Harden My Heart | Quarterflash | Geffen 49824 |
| January 30, 1982 | 5 | Harden My Heart | Quarterflash | Geffen 49824 |
| February 6, 1982 | 4 | Harden My Heart | Quarterflash | Geffen 49824 |
| February 13, 1982 | 4 | Harden My Heart | Quarterflash | Geffen 49824 |
| February 20, 1982 | 5 | Harden My Heart | Quarterflash | Geffen 49824 |
| February 27, 1982 | 7 | Harden My Heart | Quarterflash | Geffen 49824 |
| March 6, 1982 | 18 | Harden My Heart | Quarterflash | Geffen 49824 |
| March 13, 1982 | 48 | Harden My Heart | Quarterflash | Geffen 49824 |
| March 20, 1982 | 57 | Harden My Heart | Quarterflash | Geffen 49824 |
| March 27, 1982 | 92 | Harden My Heart | Quarterflash | Geffen 49824 |
Rankings greater than 100 are from the Cashbox 'Looking Ahead' charts.