For Challenge 370 E and G series models, and 420, National, and early Seybold Paper Cutters. This 1/2-12 thread steel hex head cap screw fits the Challenge 370 E and G models, Challenge 420, most National, and early Seybold Paper Cutters. (Equivalent to the original Challenge "1/2 x 1" V-Thread knife bolt, part number S-645, with the equivalent washer, originally part number S-353.)
The 1/2"-12 thread is 1-3/32" long below the washer. The washer is captive, it spins in place but it will not fall off.
Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.
To complete your return, we require a receipt or proof of purchase.
Customized products and gift cards are exempt from being returned.
Heidelberg OEM Parts are subject to re Stocking fees.
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 30 days.
Late or missing refunds
- If you haven’t received a refund yet, first check your bank account again.
- Then contact your credit card company, it may take some time before your refund is officially posted.
- Next contact your bank. There is often some processing time before a refund is posted.
- If you’ve done all of this and you still have not received your refund yet, please contact us at