What Does a g5 Tolerance Mean on a Shaft? (And How to Read Any ISO Tolerance Code)
A g5 tolerance on a shaft is an ISO 286 designation the lowercase g sets where the tolerance zone sits relative to the nominal diameter slightly below it guaranteeing the shaft is always a touch undersize and the 5 sets how wide that zone is a tight IT5 grade precision territory Together…
How to Remove Rust from Stainless Steel
Surface rust on stainless steel can usually be removed without damaging the finish using nothing more exotic than baking soda water and a soft cloth for light cases working up to an oxalic acid cleaner for stubborn spots The key rules are to scrub with the grain never use steel wool and…
Is Zinc Plated Rust Proof? No — Here’s What “Rust-Resistant” Actually Means
No zinc plating is not rust proof It’s rust resistant the zinc layer protects the steel underneath through sacrificial corrosion but it isn’t a permanent shield Once the zinc coating is worn away or consumed the underlying steel is exposed and will rust the way any bare steel does Whether the coating…
NPT vs. BSPP: Why They Don’t Interchange
NPT and BSPP are both common pipe thread standards but they’re incompatible different thread angle different thread shape and a completely different sealing approach Even in the rare case where thread counts happen to line up the geometry doesn’t and forcing them together risks a leak or damaged threads
Cobalt vs. Titanium Drill Bits: What’s the Real Difference?
The real difference isn’t the metal in the name it’s where that metal sits A cobalt drill bit is high speed steel alloyed with 5 8 cobalt running through the entire bit A titanium drill bit is ordinary high speed steel with a thin titanium nitride TiN coating on the surface it…
Rockwell vs. Brinell Hardness: What’s the Actual Difference
Rockwell measures how deep an indenter penetrates the material under load Brinell measures the diameter of the indentation left behind after the load is removed That single difference in what’s being measured drives everything else which indenter is used how fast the test runs and which materials each method suits
Brushed vs. Polished Stainless Steel: What’s the Difference?
Brushed and polished are the two most common stainless steel surface finishes and the difference is entirely about how the surface is worked after fabrication not a different alloy or grade Brushed also called satin finishes are matte with visible directional lines polished finishes are buffed to a smooth reflective sometimes mirror…
A2 vs A4 Stainless Steel: What’s the Difference?
A2 and A4 are fastener specific stainless steel designations from ISO 3506 not separate alloys in their own right A2 roughly corresponds to grade 304 stainless steel and A4 roughly corresponds to grade 316 If you’re buying bolts screws or nuts and see A2 or A4 stamped on the head you’re looking…
Static Load vs. Dynamic Load: What’s the Real Difference?
A static load is a force that stays essentially constant over time and produces no meaningful acceleration a parked car on a bridge a building’s own weight A dynamic load changes over time in magnitude direction or position and produces acceleration inertia and often vibration which is why the same weight can…
410 vs 304 Stainless Steel: What’s the Difference?
410 and 304 belong to two different stainless steel families entirely 410 is martensitic 400 series 304 is austenitic 300 series and that structural difference is what drives everything else about how they behave 410 trades corrosion resistance for hardness and heat treatability 304 trades hardness for corrosion resistance and easy fabrication…
Thread Class 2B vs. 3B: What the Numbers and Letters Actually Mean
Thread class 2B and 3B both describe internal threads the B nuts tapped holes under ASME B1 1 and the difference between them is tolerance Class 3B allows a tighter narrower clearance range between mating threads than Class 2B Class 2B is the commercial default the class assumed when a print or…
How to Calculate, Measure, and Test Tensile Strength
There are two ways to answer what’s the tensile strength depending on what you already have If you already know the maximum force a part carried before failing and its original cross sectional area it’s a one line calculation Fmax A If you don’t have those numbers yet you need to run…