China Metric Lock Nuts Manufacturers Suppliers Factory - Customized Service

Precision Metric Lock Nuts for High-Load Shaft & Bearing Alignment

Engineered with ISO-compliant metric threads and positive locking mechanisms to prevent axial movement in high-speed automation assemblies.

Shaft Lock Nuts
Precision shaft lock nuts locate bearings, gears, and drive components accurately along rotating shafts, maintaining preload under severe dynamic load and vibration conditions. Engineered with
Jam Lock Nuts
Precision Metric Jam Lock Nuts provide rigid axial positioning for ball screws, spindle bearings, and linear drive assemblies. Featuring a low-profile body integrated with a three-point radial brass
Thin Lock Nuts
Thin Lock Nuts are precision axial locking fasteners designed for assemblies with limited axial space. These components integrate radial brass pins to secure shaft threads without altering pitch
Slotted Lock Nuts
Slotted lock nuts provide positive axial locking and bearing positioning across rotating shafts and drive assemblies. Designed in accordance with DIN 981 and ISO 2982 standards, these fasteners
Face Lock Nuts
Face Lock Nuts secure bearings and ball screw support units with zero axial play. Axially positioned locking screws press copper insert pins against shaft threads, holding tight preloads and
Radial Lock Nuts
Radial lock nuts utilize high-tensile brass pins positioned perpendicular to the main axis to lock against mating shaft threads. This radial pressure creates a vibration-proof friction lock without

Category Overview

Metric Lock Nuts provide accurate axial positioning and secure clamping for bearings, ball screws, and rotating shafts. Manufactured to ISO thread standards, these components integrate radial, axial, or steel-insert locking pins to maintain clamp force under continuous vibration, rapid direction changes, and high dynamic loads.

Product Structures & Types

Radial Locking Nut (RN Series)

Employs set screws oriented perpendicular to the shaft axis. Tightening the set screw drives a brass shoe into the shaft threads without altering axial pitch alignment.

Axial Locking Nut (AF Series)

Utilizes locking screws parallel to the thread axis. Clamping force applies directly along the thread flank, offering higher breakaway torque in compact bearing housings.

Three-Point Contact Precision Lock Nut (F-Type)

Features three equally spaced locking pins angled to match the thread profile. Distributes clamping pressure evenly to eliminate thread deformation during high-speed rotation.

Heavy-Duty Slotted Lock Nut (KM/KML Series)

Designed for standard industrial bearing mounting using spanner wrenches and external locking washers. Built for high static axial loads.

Technical Specifications

Parameter	Standard Specification	Custom Option
Thread Range	M6 x 0.5 to M200 x 3.0	Custom pitch & left-hand threads
Thread Precision	ISO 4H / 6H	ISO 4h ground class
Axial Runout	0.002 mm – 0.005 mm	Under 0.002 mm
Material Base	42CrMo, 40Cr, S45C Steel	Stainless steel 304/316, Aircraft alloys
Locking Pin Material	Copper alloy, Soft brass	Sintered bronze, Polymer inserts
Hardness	HRC 28 – 32 (Thread body)	Surface induction hardened HRC 55+
Surface Treatment	Black oxide, Phosphate	Nickel plating, Zinc-nickel alloy

Core Advantages

Sub-Five-Micron Axial Runout
Thread and contact face ground in a single setup to eliminate angular misalignment and premature bearing wear.

Positive Mechanical Locking
Brass locking shoes match thread flanks directly, eliminating the need for chemical threadlockers or keyways.

Reusable Thread Alignment
Non-destructive pin designs allow repeated installation, adjustment, and disassembly without galling shaft threads.

Balanced High-Speed Operation
Symmetrical body geometries and precise concentricity reduce rotational vibration in spindle applications.

Application Fields

Machine Tool Spindles

Secures precision angular contact bearings under combined radial and heavy thrust loads.

Ball Screw Support Units

Maintains rigid preload settings on linear motion drives in continuous-duty machinery.

Robotic Gearboxes & Actuators

Prevents axial backlash accumulation in dynamic multi-axis movement.

Medical Diagnostic Systems

Delivers smooth, non-magnetic, or corrosion-resistant positioning in drive units.

Selection Guide

Determine Axial Load Requirements:

Calculate peak thrust forces to select thread size and body thickness.

Verify Rotational Speeds:

For operations exceeding 10,000 RPM, specify fine-balanced radial or three-point locking configurations.

Check Spatial Clearance:

Choose axial locking designs for narrow bearing housings where radial tool access is restricted.

Confirm Environmental Conditions:

Match surface treatments to ambient moisture and chemical exposures.

Custom & OEM Services

Non-Standard Pitch & Geometry: Production of specialized threads, left-hand threads, or custom outer diameter spanner slots.

Material Adaptation: Machining from solid stainless steel bar stock for specialized operating environments.

Quality Inspection: Material composition reports, 100% thread gauge verification, and coordinate measuring machine runout validation.

Customized Packaging: Part labeling, barcode marking, and protective industrial packaging for automated assembly lines.

Why Choose Us

Integrated Grinding Process: Threads and locating faces are finished in a continuous CNC setup to maintain tight geometric tolerances.

In-House Quality Assurance: Every batch undergoes optical projector checks, hardness testing, and axial deflection measurement prior to dispatch.

Flexible Batch Production: Dedicated manufacturing runs support small sample quantities as well as large production volume contracts.

Factory Technical Support: Engineering drawings and tolerance calculations are reviewed directly by production specialists.

FAQ

Q: What thread pitch options are available for Metric Lock Nuts?

A: Standard inventory covers metric fine pitch threads ranging from 0.5 mm to 3.0 mm, matching standard drive shaft dimensions. Custom pitches can be produced based on technical drawings.

Q: How do brass locking pins protect shaft threads?

A: The locking pins feature threads machined directly into their face. When set screws press against them, the brass deforms slightly around the mating steel shaft thread, generating friction without damaging the shaft profile.

Q: Are these lock nuts reusable after torque adjustments?

A: Yes. Because the locking mechanism does not deform the primary steel thread body, the nuts can be loosened, re-adjusted, and retightened multiple times without loss of locking torque.

Q: What surface treatments prevent corrosion in harsh environments?

A: Standard units feature black oxide or phosphate coatings. For high humidity or washdown conditions, electroless nickel plating and full stainless steel options are available.

Q: What is the maximum allowable face runout for high-precision models?

A: Precision-ground series maintain perpendicularity between the pitch diameter and contact face within 0.002 mm to 0.005 mm depending on thread diameter.

Need Precision Metric Lock Nuts for Your Assembly Line?

Submit your engineering drawings, required thread specs, and target batch volume to receive a fast, detailed technical quote and lead-time estimate.

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As one of the leading metric lock nuts manufacturers and suppliers in China, we warmly welcome you to wholesale customized metric lock nuts made in China here from our factory. For quotation, contact us now.