Shaft Nut w/ Pin Holes

Our DIN 981 metric shaft nuts with pin holes are precision-machined round nuts designed for bearing retention, shaft locking, and precise axial positioning. The radial pin holes accept a spanner wrench or locking pin for secure installation and removal, making them essential in gearboxes, motor shafts, and machine tool spindles.

Shaft Nut With Pin Holes — Metric Sizes

What Are Shaft Nut With Pin Holes?

Shaft nuts with pin holes are precision-machined cylindrical nuts featuring radial holes around the outer circumference. These holes accept a pin spanner or hook spanner for installation and removal, allowing the nut to be torqued accurately without the need for a flat-jaw wrench. Typically used with lock washers (DIN 5406) for positive locking, shaft nuts with pin holes are a standard solution for bearing pre-load adjustment, shaft retention, and axial component positioning in rotating machinery, machine tool spindles, and automotive drivelines.

Key Features and Benefits

• Pin Hole Design: Radial holes accept pin spanners and hook spanners for precise torque application and removal in confined shafts.
• Precision Machined: Close tolerances ensure accurate axial positioning and consistent bearing pre-load on precision shafts.
• Compatible with Lock Washers: Designed for use with DIN 5406 lock washers for positive locking in vibration-prone rotating assemblies.
• High Load Capacity: Heavy-duty wall thickness sustains axial forces in bearing retention and shaft clamping applications.
• Metric Fine Thread: Fine-pitch thread enables precise axial adjustment and provides higher resistance to vibration loosening.

Materials and Finishes

• Carbon Steel (Zinc Plated): Standard material for general machinery and industrial applications.
• Stainless Steel (A2 / A4): For food processing, pharmaceutical, or corrosive industrial environments.
• Alloy Steel: For high-load bearing retention in heavy machinery and automotive drivelines.

Standards Compliance

• DIN 981 — Slotted round nuts for bearing retention
• ISO 2982 — Metric round nuts with slots and holes

Size Range and Availability

Available in M12 through M100 metric fine thread.

Frequently Asked Questions (FAQs)

1. What is a shaft nut with pin holes used for?

Shaft nuts with pin holes are used for bearing retention, axial shaft positioning, and component locking on precision machinery shafts, gearboxes, motor spindles, and automotive drivelines.

2. What tool is used to tighten a shaft nut with pin holes?

A pin spanner or hook spanner is inserted into the radial holes to apply and control torque. Adjustable pin spanners are available for multiple sizes.

3. Do shaft nuts with pin holes require a lock washer?

For secure locking under vibration and dynamic loads, shaft nuts are typically used with DIN 5406 lock washers, whose tabs engage both the shaft keyway and the nut slots.

4. What thread type do shaft nuts with pin holes use?

Shaft nuts typically use metric fine thread for precise axial adjustment and improved vibration resistance compared to coarse thread.

5. What is the DIN standard for shaft nuts with pin holes?

Shaft nuts with pin holes conform to DIN 981, specifying dimensions, tolerances, and pin hole geometry.

6. What size range do you stock for shaft nuts with pin holes?

We stock M12 through M100 in metric fine thread shaft nuts with pin holes.

7. Are stainless steel shaft nuts suitable for food processing environments?

Yes. Stainless steel A4 variants are recommended for food processing and pharmaceutical machinery where hygiene and corrosion resistance are critical.

8. Can shaft nuts be used without a lock washer?

In low-vibration static applications, shaft nuts may be used without a lock washer. However, for rotating or vibration-prone assemblies, a DIN 5406 lock washer is strongly recommended.

9. What is the metric fine thread pitch for M30 shaft nut?

M30 metric fine thread is typically available in 1.5mm or 2.0mm pitch. Confirm the required pitch when ordering.

10. Can shaft nuts be used in aluminium housings?

Yes. Use stainless steel variants in aluminium housings to prevent galvanic corrosion between the nut and housing.