Defenderno9 wrote:

they do not make clear what grade stainless they are. They might be 304. Or have I missed something?

Quote:

Stainless Steel

Fit & Forget! Manufactured from 316 Stainless Steel, which is superior in strength and corrosion resistance to the more common A2 - we are proud to offer a product of exceptional quality. Pro-Bolt is the first to provide Tapered Socket Caps, Flanged Hex Heads and Domed/Mushroom Fairing Bolts. We offer a unique material in unique head styles - and to a mirror finish, absolutely no polishing is required. Forget rough nuts and take a close look at our buffed nuts! No stamp marks in the bolt heads or cracked and grainy finishes. No matter how many dark winter nights you spend polishing mass-produced inferior quality bolts, you will never achieve the quality of finish and material that we offer. Please be aware that not all stainless steel is suitable for stress areas. However, our 316 stainless steel is suitable for Engine Casings, Fairings, Screens, Front Axle Pinch, Caliper Pinch Bolts, Caliper Mount Bolts, Footrest Hanger Bolts, Clip-On Handle Bar Bolts, Brake/ Clutch Pinch Perch, Top/Bottom Yoke Clamp Bolts. Also available are 1/4 Turn D-Ring Quick Release Fasteners, 1/4 Turn Allen key Drive Fasteners, Banjo Bolts, Bleed Nipples, Axle Nuts and Motorcycle Disc Rotor Bolts.

Material specification - 316

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Manufacturing process: We manufacture in a single process on multi axis CNC machining centres, which includes thread rolling. Thread standards are to BS3692:1967 which is the British standard for ISO Precision metric threads. Route radii vary between 0.8mm and 0.4mm, this is the maximum that we can use and improves shear strength. Thread lead varies between K1 and K2

The head and shank designs are unique to Pro-Bolt and have been successfully tested in the field for the last four years
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Stainless steels are iron alloys with a minimum of 10.5% chromium with other elements (Nickel, Molybdenum, Titanium, Copper, Carbon, Nitrogen) added to enhance properties such as formability and strength. But it is the chromium-rich, oxide film that gives the corrosion resistance of stainless steel. This protective film is strong and chemically stable (i.e. passive) where there is sufficient oxygen on the surface. This strong protective film is extremely thin and will usually self repair if sufficient oxygen available. Under certain conditions the passive state can be broken down and corrosion can result
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Alloy Designations: Stainless steel 316 also corresponds to the following standard designations and specifications:

Euromorm UNS BS EN Grade
1.4401 S31600 316S31 58B 316

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Heat Resistance: 316 has good resistance to oxidation in intermittent service to 870oC and in continuous service to 925oC. However, continuous use at 425-860oC is not recommended due to its resistance to carbide precipitation. Where high strength is required at temperatures above 500oC, grade 316H is recommended.
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Torque & lubrication: Wherever possible, use torque values specified by your original equipment manufacturer. Fasteners in general use, please refer to the torque values listed. We recommend antiseize or copper based paste be applied to the threads to prevent galling - with the exception of bleed nipples and banjo bolts which should be fitted dry. If your preference is to use Threadlock we recommend a medium grade.

Thread Diameter 3mm 4mm 5mm 6mm 8mm 10mm 12mm
Max Torque in NM 1.73 3.57 6.90 11.1 28.30 37.60 97.50

Cost always comes into the equasion and Probolt are probably some of the finest made nuts and bolts in the world.... unfortunatly you have to pay the extra for it.

Glyn

XS Pete wrote:

Those titanium socket cap screws look nice. I think I have a job at work which could benefit from a handfull of those. I might accidentally order a few extras

Pete

Pete, are you sure there aren't 2 jobs that need it

Glyn