Sierra T-Bolt Band Clamp for Marine Exhaust Hose - Available in 2" and 6" ID

This Sierra T-Bolt Band Clamp is a heavy-duty stainless steel clamp built to secure marine exhaust hose in below-the-waterline applications. It is designed to fit Shields Series 200 and 250 exhaust hose, with the larger size also suited to Series 202 silicone hose. The band is 316 stainless steel,.025 inch thick and.75 inch wide, chosen for its resistance to corrosion in wet, salt-exposed engine and exhaust environments. The bolt, nut, and trunion are 18-8 (304) stainless steel, and each clamp includes an extra-long 1/4 inch bolt paired with a nylon insert locknut to resist vibration loosening over time. Each clamp carries a maximum torque rating of 75 inch-pounds, which should not be exceeded during installation to avoid damaging the hose or band.

This T-Bolt clamp line is sold as a single product family covering two inside-diameter sizes so boat owners can match the clamp to their exhaust hose without hunting through separate listings. Use it anywhere a standard worm-gear clamp is not robust enough, such as securing large-diameter exhaust hose to risers, mufflers, or through-hull fittings below the waterline.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-720
• Material: 316 stainless steel band; 18-8 (304) stainless steel bolt, nut, and trunion
• Band Thickness: 0.025 inch
• Band Width: 0.75 inch
• Bolt: Extra-long 1/4 inch bolt with nylon insert locknut
• Maximum Torque: 75 inch-pounds
• Fitment: Shields Series 200 and 250 hose (Series 202 silicone hose for the 6 inch size)
• Application: Below-the-waterline marine exhaust hose connections
• Available Sizes: 2 inch ID, 6 inch ID

Sizes & Options

Choose the clamp by the inside diameter (ID) of the exhaust hose it will secure. The 2 inch clamp fits a diameter range of 2.27-2.67 inches and is intended for 2 inch ID hose. The 6 inch clamp fits a diameter range of 6.38-7.04 inches and is intended for 6 inch ID hose. Measure the outside diameter of the hose at the clamping point and select the size whose range matches your measurement.

Frequently Asked Questions

What sizes does the Sierra T-Bolt Band Clamp come in? This clamp line comes in two sizes: a 2 inch ID clamp (Sierra 18-720-2000) that fits a diameter range of 2.27-2.67 inches, and a 6 inch ID clamp (Sierra 18-720-6000) that fits a diameter range of 6.38-7.04 inches.

What hose does this clamp fit? The Sierra 18-720 T-Bolt Band Clamp is designed to fit Shields Series 200 and 250 exhaust hose, and the 6 inch size additionally fits Series 202 silicone hose.

Is this clamp safe to use below the waterline? Yes, the Sierra 18-720 T-Bolt Band Clamp is specifically designed for below-the-waterline exhaust hose applications.

What is the band made of? The band on this Sierra T-Bolt clamp is 316 stainless steel, 0.025 inch thick and 0.75 inch wide, chosen for corrosion resistance in wet marine environments.

What hardware comes with the clamp? Each Sierra 18-720 clamp includes an extra-long 1/4 inch bolt and a nylon insert locknut, with the bolt, nut, and trunion made of 18-8 (304) stainless steel.

How much torque should I apply when tightening this clamp? The maximum torque rating for the Sierra 18-720 T-Bolt Band Clamp is 75 inch-pounds; exceeding this can damage the hose or band.

How do I know which size clamp to order? Measure the outside diameter of the exhaust hose at the clamping point: choose the 2 inch clamp (18-720-2000) for a 2.27-2.67 inch diameter, or the 6 inch clamp (18-720-6000) for a 6.38-7.04 inch diameter.

Is this a genuine Sierra part? Yes, both the 18-720-2000 and 18-720-6000 clamps are genuine Sierra parts.

What is the difference between the two clamp sizes besides diameter? Beyond the ID and clamping diameter range, the two sizes in the 18-720 line differ in overall band dimension ("C" measurement), which is larger on the 6 inch clamp (18-720-6000) than on the 2 inch clamp (18-720-2000) to match the larger hose.

Can this clamp be used for anything other than exhaust hose? The Sierra 18-720 T-Bolt Band Clamp is designed as an exhaust hose clamp for below-the-waterline applications, matched to Shields Series 200, 250, and (on the 6 inch size) 202 hose.