DIAMOND EYE BC400S304 EXHAUST CLAMP 4 INCH 304 STAINLESS STEEL TORCA BAND CLAMP

Product Description

Diamond Eye BC400S304 is a 4.0" (101.6mm) Torca band clamp built from 304 stainless steel for a uniform, 360° seal on butt-joint (end-to-end) exhaust connections. The preformed band and reaction block design applies even clamping force without crushing tubing, making installs clean, repeatable, and fully serviceable. Ideal for diesel and performance applications where corrosion resistance and leak control matter.

Fitment

• Universal 4.0" OD exhaust systems using butt-joint (gapless, end-to-end) connections.
• Works with most aluminized or stainless straight tubing and adapters sized for true 4.0" joints.
• Not for lap-joint (slip/overlap) connections—use a Torca lap-joint clamp instead (see alternatives below).

Why Choose This Clamp

• 304 stainless construction for superior corrosion resistance.
• Even, 360° sealing prevents exhaust leaks and soot streaking.
• Serviceable design—remove and re-install sections without cutting or welding.

Cross-Reference / Alternatives (Diamond Eye Only)

• Same size, aluminized: BC400A 4" Aluminized Torca Band Clamp
• Same size, 409 stainless: BC400S409 4" 409 Stainless Torca Band Clamp
• Same size, 430 bright stainless: BC400S430 4" 430 Bright Stainless Torca Band Clamp
• Lap-joint option (for slip/overlap joints): L40AA 4" Aluminized Torca Lap-Joint Clamp

FAQs

Is this a butt-joint or lap-joint clamp?

BC400S304 is a butt-joint Torca band clamp for end-to-end, gapless connections. For slip/overlap (male/female) joints, choose a lap-joint clamp such as Diamond Eye L40AA.

Will it fit 4.0" stainless and aluminized tubing?

Yes—it's designed for true 4.0" OD joints on both stainless and aluminized straight tubing, adapters, and mufflers sized for butt-joint connections.

Can I re-use this clamp?

Yes. The Torca band design allows serviceable removal and re-installation when you need to swap or adjust exhaust sections.

What torque should I use?

Typical Torca band clamps are tightened to approximately 45–60 ft-lb. Always verify with your hardware and check for uniform band compression and a gas-tight seal.

Specifications