When the Catalogue Shoulder Diameter Isn't Right
Standard shoulder bolts come in fixed diameter steps — 6, 8, 10, 12 mm and so on. When your jig bore, linear guide or die set calls for 9 mm, 11 mm, 14 mm or any size between catalogue increments, there is no standard part. EKINSUN turns custom shoulder bolts to your exact diameter and tolerance from solid bar.
The same applies when a stripper bolt wears or breaks — the shoulder is a precision fit and a close-enough replacement won't do. Send us the original and we reproduce it to the same spec, with the shoulder tolerance your tooling was designed for.
What We Make
| Type | Detail |
|---|---|
| Stripper / shoulder bolts | Precision unthreaded shoulder between head and thread; shoulder held to h6 or h7; any diameter |
| Stepped bolts | Two or more diameters along the shank; can combine threaded and unthreaded steps |
| Jig locating pins with thread | Ground or turned shoulder for accurate location; threaded shank for clamping |
| Non-standard shoulder diameter | Any diameter — 7 mm, 9 mm, 11 mm, or your exact dimension — not limited to catalogue sizes |
| Custom shoulder length | Any shoulder length to suit your stack height, spring pocket or guide travel |
Applications
Punch & Die Sets
Stripper bolts that guide the stripper plate and limit its travel — precision shoulder for consistent strip
Injection Moulds
Ejector guide pins, return pins and stripper bolts in hardened alloy steel for mould tooling
Jig Fixtures
Shoulder pins that locate workpieces repeatably — h6 tolerance for slip fit, h7 for light press
Linear Guides
Stepped bolts with precision bearing shoulder for linear rail or slide assemblies
Custom Machinery
Wherever a bolt also serves as a pivot, locating pin or travel stop — one part, two functions
Have a worn or broken stripper bolt? Send it in any condition — even a sheared shank. We measure the shoulder diameter, thread and lengths, rebuild the drawing for free and manufacture a compatible replacement. See parts from a sample or replacement bolts from a sample for how the process works.
Frequently Asked Questions
Typically h6 or h7 — the standard classes for tooling and jig pins. If your application calls for a different fit, tell us the bore diameter and fit class and we machine the shoulder accordingly.
Yes. Send the worn or broken bolt in any condition and we measure the shoulder diameter, thread, pitch, head type and all lengths. We rebuild the drawing free of charge, confirm the spec with you, then machine a compatible replacement.
A shoulder bolt has a precise unthreaded shank (the shoulder) as a locating or bearing surface between the head and the thread. A stepped bolt has two or more diameters along its length which may both be threaded. We make both and can combine features to suit your design.
Yes — that is the main reason to come to us for this part. Standard catalogues fix diameter increments. When you need 9 mm, 11 mm, 14 mm, or any size the catalogue doesn't stock, we machine it to your exact dimension and tolerance from bar.
Alloy steel (hardened for tooling), 304/316 stainless for corrosive environments, titanium for lightweight assemblies, and brass for non-magnetic applications. Material and heat treatment are matched to the wear and load requirements of your specific application.
No minimum. Single replacement stripper bolts and small sets of jig pins are normal orders. If you need one spare for a die set, that is a welcome order.
Yes. Cross-drilled shanks, wired heads, hex socket drives and other locking features are available. Specify the hole size and position or send the original bolt and we match it.
Get Shoulder Bolts Quoted
Drawing or sample both accepted. Engineers reply in 24h.