S and S Machine
Bicycle Torque Couplings (BTCs)
Your Travel Bike........Your Only Bike!

Stainless Steel "Classic" BTC™ Specifications

Coupling Size and Weight


  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 grams 

Important

Mechanical Properties of Materials


                            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.

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.


Click to see the bike


This is a standard BTC with pointed lugs.
Most carved BTCs start out looking like this.


This is a straight lug BTC (no points). 
This configuration allows total freedom for the framebuilder to carve any artistic design.
Imagine the possibilities!


Additional dimensions (in tifor our "Classic Stainless Steel Couplings"
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"

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S and S Machine, 9334 Viking Place, Roseville, CA. 95747
TEL. 916-771-0235 FAX 771-0397
e-mail: steve@sandsmachine.com