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Shoulder Bolts
These shoulder bolts come in both metric and imperial sizes, made from tough alloy steel and stainless-steel options. Perfect for those jobs where regular fasteners just give up – these bolts keep working when failure isn’t an option. What Makes These Different From Regular Bolts?Most people ignore bolts until one breaks and ruins their day. Shoulder bolts (some folks call them shoulder screws or stepped bolts) have that distinctive smooth section between the head and threads. This isn’t random – that smooth part lets attached parts rotate or slide without much friction. The precise sizing keeps everything properly spaced, which matters a ton in machines where tiny tolerances make or break performance.
Specifications:-
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Shoulder Bolts – Product Benefits
- High Precision & Dimensional Accuracy
Engineered per ISO 7379 and ANSI B18.3 standards, ensuring consistent shoulder dimensions for precise alignment and smooth rotation. - Corrosion Resistance
Manufactured using corrosion-resistant materials like SS-304 and SS-316, making them ideal for challenging environments. - Versatility in Applications
Perfect for integration into tooling, dies, jigs, pulleys, and heavy mechanical assemblies thanks to a robust, load-bearing design. - Smooth Bearing Surface
Features a polished shoulder that minimizes friction and wear, promoting efficient movement in sliding or rotating parts. - Available in Multiple Material Grades
Offered in various grades—SS-304 for general use, SS-316 for harsh environments, and Alloy Hardened for heavy-duty needs—providing the right solution for every application.
These high-performance Shoulder Head Bolts are widely used across segments such as Aerospace, Automotive, and Industrial applications.
Why Our Shoulder Bolts?
High Precision That Actually Matters
Built to meet ISO 7379 and ANSI B18.3 standards, so they maintain consistent dimensions. The tight tolerances (h9 grade) really matter because tiny variations can cause huge headaches later. We’ve seen whole production runs scrapped because of loose tolerance fasteners – not something you want to deal with. Each batch gets thoroughly checked – nothing leaves that doesn’t measure up perfectly.
Corrosion Resistance
Made from like SS-304 and SS-316, these hold up in tough environments where ordinary fasteners rust away to nothing. The passivated finish on the stainless versions gives extra protection against chemicals and moisture. Might seem excessive for some jobs, but for equipment sitting outside or in harsh industrial settings? That protection pays for itself many times over.
Works In Pretty Much Everything
Great for tooling, dies, jigs, pulleys, and heavy mechanical assemblies because of their solid, load-bearing design. The ground shoulders create bearing surfaces that normal bolts just can’t match. Put these in automation systems, conveyor equipment, or precision machinery, and you’ll notice the difference right away – smoother operation and way longer component life.
Super Smooth Where It Counts
Has a polished shoulder that cuts down on friction and wear, letting parts slide or rotate efficiently. This fine surface finish (around Ra 0.8) often means you don’t need separate bushings – so assembly gets simpler while keeping exact tolerances. Bottom line? Less maintenance, longer service life, and fewer surprise problems ruining your day.
Different Materials For Different Jobs
Not every job needs the same stuff. SS-304 works fine for most general uses. Need something tougher for caustic environments? SS-316 handles that perfectly. And for those really demanding load-bearing spots, the heat-treated alloy steel versions give superior strength where regular fasteners would just bend and give up.
Real-World Uses of our Shoulder Bolts
These specialized bolts solve actual problems across many industries:
- Automotive segments use them for assembly fixtures, stamping dies and test equipment where precise movement really matters.
- Aerospace facilities need them in ground support equipment and assembly tooling that absolutely cannot have any play or misalignment.
- Factory automation depends on them in robot systems, conveyor setups, and positioning equipment.
- Mold makers rely on them for ejector mechanisms and slide systems in injection molding operations.
- Medical equipment manufacturers choose them for pivoting components and adjustment mechanisms where smooth operation and cleanliness count.
Quality You Can Count On
Every batch goes through multiple quality checks – dimensional verification, material testing, performance validation. This strict attention to detail means fewer failures and more reliable performance in the field.
Custom shoulder bolts made to exact specifications are available when standard sizes just won’t work. Just provide your specs for quick quotes and production.
Our engineering team offers technical guidance based on your specific application to help select the perfect shoulder bolts for your job. Dealing with alignment issues that keep coming back? Getting a quote now might save weeks of frustration down the road. Contact Us directly with specific technical questions that need immediate answers.
Frequently Asked Questions
What’s the real difference between shoulder bolts and standard bolts?
That precision-machined unthreaded shoulder provides a bearing surface for rotating components that normal bolts just don’t have.
How do I pick the right shoulder length?
Match shoulder diameter to your bearing hole, make sure shoulder length covers the total thickness of moving parts, and pick thread size based on how much holding strength you need.
Can you make custom dimensions?
Absolutely – non-standard dimensions, materials, and finishes can be ordered for specialized applications.
Who actually uses these shoulder bolts?
Any industry needing precise alignment and controlled movement – automotive, aerospace, factory automation, mold making, and medical equipment manufacturers rely on them every single day.
