S and S Machine
Bicycle Torque Couplings (BTCs)
Your Travel Bike........Your Only Bike!
Stainless Steel "Classic" BTC™ Specifications
Frame Tube Diameter Coupling Weight
5/8" 15.8 mm 2.36 oz 67 grams 3/4" 19.0 mm 3.07 oz 87 grams 7/8" 22.2 mm 3.47 oz 98 grams 1" 25.4 mm 4.23 oz 120 grams 1 1/8" 28.6 mm 4.58 oz 130 grams 1 1/4" 31.7 mm 5.11 oz 145 grams 1 3/8" 34.9 mm 5.64 oz 160 grams 1 1/2" 38.1 mm 6.17 oz 175 grams 1 3/4" 44.5 mm 8.38 oz 238 grams 1 7/8" 47.6 mm 9.55 oz 271 grams 2" 50.8 mm 10.39 oz 295 gramsImportant
Heat Hard. UTS .2% YS Elong
Part Name Material treat Rc ksi ksi % in 2"
Coupling Lugs 17-4 PH SS H1150 c33 145 125 19
Coupling Nut 17-4 PH SS H900 c44 200 185 14
Data shown above is believed to be representative but should not be used for design or application selection purposes. Specifications are subject to change without notice.
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Custom Carved "Classic" Lugs Some of the builders will custom carve the lugs to create a one of a kind masterpiece. To see more, visit our carved lug page. |
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| Additional dimensions (in tifor our "Classic Stainless Steel Couplings" | ||||
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| Coupling size or frame tube diameter |
Overall length Tip to tip A |
Radius to radius B |
Tube removed for a retrofit (approximate) |
Socket depth, each side (approximate) A-B/2 |
| 5/8" | 2.900" | 1.900" | 1.375" | .762" |
| 3/4" | 2.900" | 1.900" | 1.375" | .762" |
| 7/8" | 3.375" | 1.900" | 1.375" | 1.000" |
| 1" | 3.375" | 1.900" | 1.375" | 1.000" |
| 1 1/8" | 3.375" | 1.900" | 1.393" | .991" |
| 1 1/4" | 3.375" | 1.900" | 1.393" | .991" |
| 1 3/8" | 3.375" | 1.900" | 1.393" | .991" |
| 1 1/2" | 3.375" | 1.900" | 1.393" | .991" |
| 1 3/4" | 3.625" | 2.100" | 1.500" | 1.0625" |
| 1 7/8" | 3.625" | 2.100" | 1.500" | 1.0625" |
| 2" | 3.625" | 2.100" | 1.500" | 1.0625" |
