I hate to rain on the parade but stock-drive / sterling Instruments has the same pitch
acetal chain for a lot less per foot:

SDP-SI's part:

Part Number A 6M 7-12
Unit Inch
Pitch 0.1227"
Material Acetal
Chain Type Roller
Assembly Method Snap
Sell Unit Priced Per Foot
Approx. Links / Foot 98
No. Of Strands 1
Ult. Tensile Load 6 lbs
Operating Speed 1000 ft/min

Quantity Price
1 to 29 $8.52
30 to 99 $6.99
100 and up $6.06
Availability In Stock
Sell Unit Foot


Micro Mark's :
Power animated displays, robotics, model trains and other miniature mechanisms. Tough, durable, self-lubricating acetal resin chain links snap apart for easy adjustment. Chain pitch: .1227 inch; width .162 inch; thickness .082 inch. (Note: Chain sold only in increments of one foot.) Our Price (per foot): $17.45

This isn't a post to slam Micro Mark; I love 'em. You just have to know what you're buying...

Jerry