SRP makes Titanium stem expander bolts in several lengths, of Titanium Ti 6-4 alloy. Each of these bolts is turned on a lathe to reduce the rod stock to the dimensions required for head and shank of the bolt. The head, which has 12.7mm outer diameter, is drilled for the hex head (allen), then "broached", which is the punching of the 6mm hex shape into the head, then the threads are rolled onto the shank. The expander bolt has 8mm threads with a 1.25mm thread pitch. They come in four lengths, (top of shank to bottom of threads), 70mm, (for Control stems), 90mm (for the Zoom stem), 135mm, and 143mm which most of the remaning stems. Replacements should not be any shorter than the useful length your stem requires. They may be longer, but not shorter. The 70mm bolt weighs 16 grams, the 90mm weighs 19 1/2 grams, the 130mm weighs 27 grams, and the 143mm weighs 29 grams.
The expander bolt for the Ritchey Force Comp Road stem, made by Nitto doesn't follwo conventionality in theading, by using a 8mm diameter shank, nor does it adopt the 7mm shank used in the Ritchey Taiwan stems. Instead it uses a 6mm x 1mm pitched thread on a bolt that is 129mm long. The SRP exact replacement weighs 14 grams.
6mm x 1mm x 129mm $ Price in Catalog
The 1A and XA expander bolt is rather unique. It is 135mm long with 7mm x 1mm thread pitch. The head is 12mm in diameter, with a 9.5mm height to recess flush into the stem. This SRP bolt is an exact replica of Ti 6Al-4V and has a weight of 25 grams.
7mm x 1mm x 135mm $ Price in Catalog
SRP recognized that some XA owners may want to change their steel binder bolt to Titanium, this is that bolt. The rod is turned to the proper dimensions for head and shank. The head is drilled and broached, making a 6mm hex head, then the threads are rolled onto it. The outer diameter of the head is 12.8mm. The bolt has 8mm threads by 1.25mm thread pitch. The bolt is 20mm long and weighs 7 grams, nearly half the weight of the steel original.
8mm x 1.25mm x 20mm $ Price in Catalog
In many instances people want to replace their steel binder bolts with Titanium ones, these bolts make that possible. They are made like the other SRP bolts, machined, with rolled threads of lightweight Ti 6-4 Titanium alloy. These bolts have a 5mm hex head with 6mm threads by 1mm thread pitch. The outer diameter of the head is 9.6mm. They come in three lengths, 20mm, 33mm, and 45mm. The 20mm length weighs 3 grams, the 33mm bolt weighs just under 5 grams, while the 45mm bolt weighs 6 grams. These also fit other parts like brakes and seatposts.
6mm x 1mm x 15mm $ Price in Catalog
6mm x 1mm x 20mm $ Price in Catalog
6mm x 1mm x 25mm $ Price in Catalog
6mm x 1mm x 30mm $ Price in Catalog
6mm x 1mm x 33mm $ Price in Catalog
6mm x 1mm x 45mm $ Price in Catalog
6mm x 1mm x 55mm $ Price in Catalog
These are really the long version of SRP Titanium water bottle cage bolts, but they fit perfectly as replacement binder bolts for the IRD Macaroni and Ricky Racer stems. They are made of Ti 6-4 Titanium rod, which is turned to the proper dimension for the head and shank, the head is drilled then broached with a 4mm hex head. The threads on these are rolled. The outer diameter of the head is 8.3mm. The bolt has 5mm threads by .8mm thread pitch and is 18mm long. Each bolt weighs 2 grams. Sold in pairs.
5mm x .8mm x 18mm - pair $ Price in Catalog
This kit contains Titanium 6Al-4V replacements for the two steel bolts used in the Control Mountain and Road stems. The expander bolt, is 70mm long, with 8mm threads by a 1.25mm thread pitch. The expander bolt has a 6mm allen head and weighs 16.5 grams. The binder bolt, has a 5mm hex head, with 6mm by 1mm thread pitch, is 15mm long, and weighs 3 grams. The threads on both bolts are cold rolled onto the machined shank. $ Price in Catalog
This kit contains Titanium 6Al-4V replacements for the three steel binder/clamp bolts and an aluminum replacement for steel cap/SFN bolt used on the Control Ahead stems. The binder (1) /clamp (2) bolts, have a 5mm hex head, with 6mm by 1mm thread pitch, are 15mm long, and weighs 3 grams each. The cap/SFN bolt is machined from aluminum rod with 6mm x 1mm with a 30mm length. It ha a 5mm hex head and weighs a slim 3 grams, (aluminum, ever-light). The threads on all three bolts are cold rolled onto the machined shank.