AB Biller New Stainless Steel Shaft 60 Inch Speargun (AP-319)
Details: Introducing a new stainless steel shaft for the “48 Special” speargun. This shaft is 5/16″ stainless spring steel and is manufactured from a special alloy originally developed for the U.S. Navy. Heat treated to Rockwell 44C, this shaft will produce a unique combination of hardness and spring tension.
Item Condition: New
Specifications
| Feature | Material: 5/16″ stainless spring steel |
|---|---|
| Alloy Origin | Originally developed for the U.S. Navy |
| Heat Treatment | Rockwell 44C |
| Compatibility | Designed for AB Biller “48 Special” speargun |
| Length | 60 inches |
FAQ
What is the material composition of the shaft?
The shaft is made from 5/16″ stainless spring steel, manufactured from a special alloy originally developed for the U.S. Navy.
What is the hardness level of the shaft?
The shaft is heat treated to Rockwell 44C hardness.
Is this shaft compatible with the 48 Special speargun?
Yes, this shaft is specifically designed for the AB Biller “48 Special” speargun.

Blake Hunter –
Fitted the shaft to my 48 Special speargun without any issues. The spring tension feels strong and responsive. The stainless steel construction feels durable and the heat treatment gives it a good balance of hardness and flexibility.
Frank Martin –
Received the shaft quickly and it matches the specifications listed. The material feels solid and the length is perfect for my speargun. It’s a reliable upgrade for the original shaft.
Jason Abraham –
The shaft performs well under repeated use. The Rockwell 44C treatment ensures it holds its shape and maintains tension. It’s a high-quality replacement that fits perfectly.