The Fastener Enquiry Checklist: 9 Details for an Accurate Quote
Send these nine details with your fastener enquiry and you get a firm price and lead time in one reply instead of a chain of quest...
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10 articles by S A Engineering Team
Bolt Preload and Tightening Torque: A Practical Guide for Maintenance Teams
Why a bolt has to be tightened to the right tension, how torque relates to preload, and the habits that keep bolted joints from lo...
Corrosion Protection for Bolts: Black, Oiled, Galvanised or Painted?
How common bolt finishes compare, where each makes sense, and the details to watch when you specify galvanised bolts and nuts.
How to Read an RDSO Drawing Before Ordering Track Fasteners
Drawing number, alteration, title block and notes — the parts of an RDSO drawing that decide what your supplier manufactures.
Foundation Bolts: Types, IS 5624 and How to Specify Them for Machinery
L-type, J-type, rag and plate-anchored foundation bolts — what each is for, and the dimensions you need to give your manufacturer.
Railway Plate Screws: Their Role and the RDSO T-3911 to T-3918 Drawings
Plate screws hold bearing plates and base plates to sleepers. What they do, where they are used and how to order them by RDSO draw...
Track Bolts for Points and Crossings: What They Do and How to Order Them
Turnouts are full of bolted assemblies, each with its own RDSO drawing. How track bolts for points and crossings are specified and...
Bolt Property Classes 4.6, 8.8 and 10.9: What the Numbers Mean
The two numbers stamped on a bolt head tell you its tensile and yield strength. Here is how to read them and match nuts correctly.
IS 1363 Hexagon Head Bolts Explained: Product Grade C, Sizes and Thread Pitch
IS 1363 covers product grade C hexagon head bolts and nuts. Here is what that means, which thread pitches apply from M12 to M64, a...
Fish Bolts in Railway Rail Joints: Function, Sizes and RDSO Drawings
What a fish bolt does at a rail joint, why the RDSO drawing matters, and what to check before you order fish bolts with nuts.