| Newark | 51K9876 | 5 | | 5 | 1 @ $7.73, 10 @ $7.27, 25 @ $6.37, 50 @ $5.60, 100 @ $5.35, 250 @ $5.10, 500 @ $4.70, 1000 @ $4.52 |
| Newark | 83R2963 | 1 | | 1 | |
 Newark | 29AJ4165 | 10 | 1019 | 10 | 1 @ $0.99 |
| standardelectricsupply.com | 2383766 | 1 | | 1 | 1 @ $21.00 |
 Walker Industrial | S501-63-R | 5 | 3 to 5 Days | 5 | 1 @ $2.58 |
| MRO Supply | 1376922 | 1 | | 1 | |
 Raptor Supplies | AB8WUE | 1 | | 1 | 1 @ $52.18 |
 TME | BK1-S501-6-3-R | 10 | 909 | 10 | 10 @ $1.38, 50 @ $1.14, 100 @ $0.95, 500 @ $0.79, 1000 @ $0.69 |
| Waldom | EATON ELECTRONICS BK1/S501-63-R | 1 | | 1 | |
| Waldom | EATON ELECTRONICS S501-63-R | 1 | | 1 | |
 Platt.com | 0966744 | 1 | | 1 | 1 @ $6.15 |
| us.rs-online.com | 74057119 | 100 | | 5 | 100 @ $4.29 |
| Dale-Electric | S501-63-R | 1 | | 1 | 1 @ $2.82 |
 Zoro | G2068692 | 1 | | 1 | 1 @ $16.60 |
| us.rs-online.com | 74056488 | 1000 | | 1000 | 1000 @ $0.90 |
| Digi-Key | 2173077 | 1 | | 1 | 1000 @ $0.89 |
| Digi-Key | 2174055 | 1 | | 1 | 100 @ $5.05 |
| Waldom | EATON BK1/S501-63-R | 1 | | 1 | 1 @ $0.69, 250 @ $0.66, 500 @ $0.64, 1000 @ $0.62, 5000 @ $0.61 |
| Waldom | EATON S501-63-R | 1 | | 1 | 1 @ $3.44, 2 @ $3.28, 3 @ $3.20, 5 @ $3.09 |
 Avnet | BK1-S501-63-R | 1000 | | 1 | 1000 @ $0.69, 10000 @ $0.62 |
| Mouser | 504-S501-63-R | 1 | 8 | 1 | 1 @ $6.39, 10 @ $5.95, 100 @ $3.86, 1000 @ $3.03, 10000 @ $2.76 |
| Amazon | B003ATW2WC | 1 | | 1 | |
 Digi-Key | S501-63-R-ND | 1 | | 1 | |
 AI Consolidated | S501-63-R-BUSSMANN | 1 | -2 | 1 | 1 @ $2.81 |
| Hotenda | H579871 | 1 | | 1 | |
| Hotenda | H602680 | 1 | | 1 | |
| Future Electronics | 7019826 | 1000 | | 1000 | 1000 @ $0.68, 800 @ $0.60 |