Product Description
Diamond Eye BC400S409 is a universal 4.0-inch Torca band clamp built from corrosion-resistant 409 stainless steel for a clean, even seal on butt-joint connections—no welding, no crushed tubing. Ideal for serviceable joints on diesel and performance exhaust systems.
- Uniform 360° clamping force for a leak-resistant seal
- 409 stainless band and hardware for daily-use durability
- Serviceable design—remove and re-fit sections without damage
- Fits standard 4.0" OD-to-OD butt-joint couplings
Fitment
Universal for 4.0" exhaust systems using a butt-joint (band clamp) connection. Works across diesel and gas applications where both tubes are 4.0" OD.
Cross-Reference / Alternatives (Diamond Eye only)
- BC400A – 4" Aluminized Torca Band Clamp
- BC400S304 – 4" 304 Stainless Torca Band Clamp
- BC400S430 – 4" 430 Bright Stainless Torca Band Clamp
Why CPP Diesel
We stock the hardware that saves installs—band clamps, lap joints, elbows, and more—backed by real diesel techs and fast shipping from the U.S.
Specifications for DIAMOND EYE BC400S409
| Specifications for BC400S409 | |
|---|---|
| Brand | Diamond Eye Performance |
| Part Number | BC400S409 |
| Size / Type | 4.0" Torca band (butt-joint) |
| Material | 409 stainless steel |
| UPC | 841963119978 |
| GTIN (14) | 00841963119978 |
| Engine Compatibility | Universal 4.0" systems (diesel/gas) |
| Country of Origin | Not specified |
| Shipping Weight | ~1 lb |
| Package Dimensions | Approx. 8" × 6" × 6" |
| Shipping Method | Ground (standard) |
| Prop 65 | Not listed by manufacturer |
FAQ
Will this fit my 4" exhaust?Yes—if both mating tubes are 4.0" OD and designed for a butt-joint band clamp. For lap-joints (ID-to-OD overlap), use Diamond Eye “L” series lap-joint clamps.
What’s the benefit of a Torca band clamp vs. a U-bolt?
Band clamps apply even, 360° pressure without crushing the pipe, so sections can be removed and re-installed without distortion.
What’s the difference between 409 and 304 stainless?
409 offers great heat resistance and value; 304 has higher chromium/nickel for enhanced corrosion resistance. Choose 304 for harsh winter/salt use; choose 409 for solid everyday durability at a lower cost.
Is this a lap-joint or butt-joint clamp?
BC-series band clamps are for butt-joint (OD-to-OD) connections. For overlap (ID/OD) connections, select an “L” series lap-joint clamp.
