Shoulder Screws Precision‑Shoulder Fasteners For Positioning, Pivoting And Spacing Assembly

Short Description:

Shoulder Screws Precision‑Shoulder Fasteners For Positioning, Pivoting And Spacing Assembly

Product Detail

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1. Functional Structure Break‑Down

Each shoulder screws consists of three core functional sections, each serving distinct engineering purposes:

Head & drive section: Transmit tightening torque; available in socket hex, phillips pan‑head, torx drive for different tooling conditions.
Precision‑ground shoulder (key functional part): Smooth un‑threaded cylindrical journal, determines fit tolerance for bore hole, bearing or bushing mating; undertakes shear load, acts as pivot shaft or spacing limit.
Threaded end section: Only provides clamping pre‑load, does NOT participate in positioning or rotation fit.

2. Main Parameter Overview Table

Parameter	Available Options
Product	shoulder screws
Head & Drive	Socket hex, pan‑head phillips, torx drive
Standards	ISO‑7379, DIN9841, custom non‑standard
Shoulder Tolerance	f9 / h6 precision ground grade
Material	Carbon‑steel, alloy‑steel, 304 /316 stainless steel
Surface Treatment	Zinc‑plated, black‑oxide, passivated stainless finish
Metric Size	Shoulder Dia Ø3‑Ø25mm; custom shoulder length
Key Feature	Positioning shoulder independent from clamping thread

3. Simple Selection Decision Tree For shoulder screws

Follow these branches to narrow down your specification：

If for pivot / bearing‑rotating joint

Requirement: smooth rotation, minimal clearance ‑ Pick h6 precision ground shoulder tolerance ‑ Material: alloy‑steel for heavy load; stainless‑steel for damp environment ‑ Confirm bore hole adopts matching H7 fit tolerance

If only for fixed spacing & limit stop

Requirement: fixed spacing dimension, no continuous rotation ‑ Adopt f9 commercial‑grade shoulder tolerance ‑ Carbon‑steel is acceptable for indoor dry environment

If working under heavy shear force

Requirement: resist shear fracture ‑ Select alloy‑steel heat‑treated shoulder screws ‑ Avoid using stainless‑steel for high‑shear heavy‑load scenarios

If exposed to humid / coastal atmosphere

Requirement: anti‑corrosion ‑ Choose 304 or 316 stainless‑steel shoulder screws

4. Our Custom Manufacturing & Delivery Workflow

When standard‑catalog shoulder screws cannot meet special shoulder diameter, shoulder length, drive‑type or tolerance demand：

Submit technical drawing: mark shoulder diameter, shoulder length, thread spec, tolerance grade, material and surface finish.
Engineering team reviews manufacturability, returns formal quotation plus production lead‑time.
Produce pre‑production samples for fit‑test, pivot test or spacing‑verification on customer’s real workpiece.
After sample confirmation, proceed to mass‑volume manufacturing and shipment.