A2-70 SS Bolts in Flat Mount?
Moderator: robbosmans
Hi,
Is it ok, to use A2-70 Stainless Steel bolts in Flat Mount calipers?
I used them in PM calipers without issues, but it were M6 bolts. Flat Mount uses quite short M5 and I am little worried.
I see that e.g SRAM has Stainless Steel bolts, but I am not sure if they are better/ worse than mentioned A2-70.
Is it ok, to use A2-70 Stainless Steel bolts in Flat Mount calipers?
I used them in PM calipers without issues, but it were M6 bolts. Flat Mount uses quite short M5 and I am little worried.
I see that e.g SRAM has Stainless Steel bolts, but I am not sure if they are better/ worse than mentioned A2-70.
-
- Posts: 65
- Joined: Tue May 19, 2020 11:44 pm
Why would it not be ok? FWIW I use A2 torx bolts on my calipers as it's what I had lying around at the time.
Sent from my CPH2207 using Tapatalk
Sent from my CPH2207 using Tapatalk
Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓ Broad Selection ✓ Worldwide Delivery ✓
www.starbike.com
-
- Posts: 1162
- Joined: Fri Feb 18, 2005 6:50 pm
- Location: Wilmington, DE
- Contact:
A2-70 is roughly equivalent to metric grade 8.8. -80 is the true equivalent (typically A4 SS, 316) but quite rare to see. Unless you are replacing an alloy steel fastener (like a crank bolt) or a specialized stem bolt, it will be strong enough.
-
- Posts: 1162
- Joined: Fri Feb 18, 2005 6:50 pm
- Location: Wilmington, DE
- Contact:
Based on that torque spec, Shimano and Orbea are assuming/insisting that an alloy steel fastener (metric grade 10) is used. That's surprising to me, but you are right to be concerned about using a lower strength fastener. You could try to find some A4-80 fasteners that get you closer to grade 10 strength, or go all in and use A286 stainless steel screws, assuming you can find them in the size you need. All the strength of grade 10, in stainless, but you'll pay dearly for them (>$5 per screw).
Of course, if you simply want an alternative to Shimano/SRAM/TRP hardware, any grade 10 steel fastener will do. You'll likely be stuck with an 3mm hex recess, though.
Of course, if you simply want an alternative to Shimano/SRAM/TRP hardware, any grade 10 steel fastener will do. You'll likely be stuck with an 3mm hex recess, though.
Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓ Broad Selection ✓ Worldwide Delivery ✓
www.starbike.com