Fastener specifications

[capescw]

I could use some help in translating 'army talk' to English, and this is AFTER reading a previous post:

http://www.willysmjeeps.com/v2/modules. ... ight=grade

For example:

G740-7372864, Mfrs P/N SP-S6-73-124, SCREW, hex-hd, s-fin, alloy-S, 3/8-16NC-2 x 1 1/2

I trasnslate to ' Screw, hex head, 3/8-16 thread, unified coarse thread, fit rating 2, 1-1/2 inches long'. What do 's-fin' & 'alloy-s' actually mean.

Additionally, there are several grades of fasteners, ranging from 'Home Depot nickel plated' to 'Grade 2,5,& 8' (and beyond). How is that specified in this example?

Beyond this, was the thread length vs overall screw length ever specified?

What would we do without this forum ???

[wesk]

Bill,

As mentioned in the referenced post you should use at least grade 5 bolts in all structural installations.

Grip length vs thread length vs overall length is as standard in standard hardware. There are some critical bolts listed in the parts manual that are not standard hardware but are special hardware usually either made to order or of a much higher MIL Spec then the civvy grade 5 or 8. These will have have special length specs.

All of those material abbreviations are spelled out in the front of your ORD 9 SNL G-740 1955 on pages 5 & 6.

What do 's-fin' & 'alloy-s' actually mean

S = steel
fin = finish
Alloy-S = Steel alloy.

[TomM]

Bill,

See page 5 of Ord 9 G740 for more abbreviations/translations.

Tom