High-Strength Steel Locking-Collar Rivets (Steel Lockbolts)

High-Strength Steel Locking-Collar Rivets and Ring-Groove Lockbolts for OEM Structural Assemblies

Product Overview

JUXIN FASTENERS supplies high-strength steel locking-collar rivets, also known as steel lockbolts or ring-groove fastening systems, for industrial OEM manufacturing and mechanically demanding metal assemblies.

JUXIN Product Reference: JX-D-L-ST

This steel fastening system uses a grooved steel pin and a compatible steel locking collar. During installation, dedicated tooling draws the joint together and plastically deforms the collar into the locking grooves of the pin.

The resulting pin-and-collar connection provides permanent mechanical fastening without relying on a conventional threaded nut.

Steel lockbolts may be evaluated for applications involving vibration, cyclic loading and structural assembly requirements, provided the selected system has verified mechanical performance.

Unlike conventional blind rivets, typical two-piece steel locking-collar rivets require access to both sides of the joined components.

The exact steel grades, pin geometry, collar design, surface treatment, strength and installation requirements must be confirmed from the approved engineering specification.

Product Specifications

Steel Lockbolt Components: Pin and Collar

A steel locking-collar rivet assembly normally consists of two separate engineered components.

1. Steel Lockbolt Pin

The pin passes through the mounting holes of the joined components.

Depending on the design, it may incorporate:

• Formed head

• Load-bearing shank

• Locking grooves

• Grip section

• Installation gripping section

• Designed breakneck or other installation feature

The actual geometry must be established from the approved drawing.

2. Steel Locking Collar

The collar is positioned over the pin on the opposite side of the joint.

During installation, the collar is swaged into the pin grooves.

The collar material, hardness, dimensions and swaging characteristics must be compatible with the selected pin.

The pin and collar should be specified and purchased as a matched fastening system.

Engineering Solution 1 — How Steel Locking-Collar Rivets Work

A steel lockbolt creates a permanent mechanical connection by swaging a collar into the locking grooves of a pin.

The typical installation sequence is:

1. Prepare the mounting holes.

2. Align the joined components.

3. Insert the steel pin through the joint.

4. Position the compatible steel collar on the opposite side.

5. Engage the approved installation tool.

6. Apply the required installation force.

7. Draw the joined components together.

8. Swage the collar into the pin grooves.

9. Complete the designated installation cycle.

10. Inspect the installed pin and collar.

For break-pintail designs, the excess installation tail breaks at its designated location.

For pintail-less systems, installation is completed without a conventional break-off tail.

These two designs require different engineering and tooling considerations.

Engineering Solution 2 — Steel Lockbolts vs. Conventional Bolts and Nuts

Steel lockbolts and threaded bolts use different fastening mechanisms.

Neither system should be substituted for the other without engineering review.

Engineering Solution 3 — Steel Lockbolts vs. Structural Blind Rivets

The main difference is installation access and joint formation.

A conventional structural blind rivet uses a rivet body and pull mandrel, allowing installation from one side.

A typical steel locking-collar rivet uses a grooved pin and separate collar, requiring access to both sides.

The collar is swaged into the grooves rather than forming a blind-side rivet body.

For assemblies with restricted rear-side access, a structural blind rivet may be more appropriate.

For accessible joints requiring a pin-and-collar fastening system, a steel lockbolt may be evaluated.

Engineering Solution 4 — Ring-Groove Mechanical Locking

The ring-groove profile is a critical part of the locking mechanism.

During installation, the collar material flows into the grooves under the action of the swaging tool.

This establishes mechanical engagement between the pin and collar.

Important engineering parameters include:

• Groove diameter

• Groove profile

• Groove spacing

• Collar internal geometry

• Collar material properties

• Swaging force

• Pin strength

• Installed collar dimensions

A collar from one system should not be assumed compatible with another manufacturer's pin.

Engineering Solution 5 — Steel Pin and Collar Material Selection

The original JUXIN product description identifies steel for the pin and collar.

It also mentions traditional material descriptions corresponding to 35 steel for the pin and 10 steel for the collar.

However, those exact grades have not been verified against current material certificates or approved drawings.

The engineering specification should establish:

• Pin steel grade

• Collar steel grade

• Heat treatment, where applicable

• Material condition

• Tensile properties

• Hardness requirements

• Surface coating

• Corrosion protection

• Traceability

The pin and collar may require different mechanical properties because they perform different functions.

The pin carries the primary fastener loads, while the collar must deform correctly during swaging and maintain engagement with the grooves.

Engineering Solution 6 — Shear Strength

Shear strength is important in metal assemblies exposed to transverse loading.

Steel lockbolt shear performance depends on:

• Pin diameter

• Steel grade

• Heat treatment

• Shear-plane location

• Pin geometry

• Joint thickness

• Hole diameter

• Installation quality

The complete joint must also be evaluated for panel bearing, edge tear-out and other failure modes.

No numerical shear values are claimed without verified product testing.

Engineering Solution 7 — Tensile Strength

Tensile loading acts along the fastener axis.

Potential failure mechanisms include:

• Pin fracture

• Collar deformation

• Collar disengagement

• Pin head pull-through

• Panel deformation

• Local material failure

The pin-and-collar connection must be qualified as a complete system.

A high-strength steel pin alone does not establish the tensile capacity of the installed assembly.

Engineering Solution 8 — Joint Clamp and Installation Consistency

The installation process draws the connected components together while the collar is swaged into the pin grooves.

The resulting clamp behavior depends on the selected fastener system.

Relevant factors include:

• Joint thickness

• Component stiffness

• Surface condition

• Collar design

• Tooling condition

• Installation force

• Groove geometry

• Joint relaxation

No specific clamp force or preload value is claimed without supporting data.

Engineering Solution 9 — Vibration Resistance

Steel locking-collar systems may be considered for assemblies exposed to vibration and repeated mechanical loading.

The mechanically engaged collar can provide an alternative to threaded fastening where permanent joints are appropriate.

However, vibration resistance depends on the complete assembly.

Engineering validation should consider:

• Joint stiffness

• Clamp retention

• Collar engagement

• Cyclic loading

• Hole fit

• Fatigue

• Corrosion

• Installation quality

The term vibration-resistant should not be interpreted as a guarantee against every dynamic failure condition.

Engineering Solution 10 — Fatigue and Dynamic Loading

Fatigue performance is important in commercial vehicles, industrial machinery and heavy equipment.

Relevant design considerations include:

• Applied load spectrum

• Pin diameter

• Joint geometry

• Material properties

• Fastener spacing

• Hole quality

• Clamp retention

• Environmental exposure

Where fatigue is critical, representative joint testing and approved acceptance criteria are required.

Engineering Solution 11 — Thermal Expansion and Contraction

Temperature changes can alter the relative dimensions and loading of joined components.

Steel lockbolts may be evaluated for assemblies exposed to thermal cycling, but suitability depends on:

• Pin steel grade

• Collar steel grade

• Mating materials

• Thermal expansion

• Joint stiffness

• Temperature range

• Long-term relaxation

No universal temperature capability is claimed.

Engineering Solution 12 — Corrosion Protection for Steel Lockbolts

Steel lockbolts may require protective surface treatments.

The original JUXIN specification does not confirm the actual coating.

Potential engineering considerations include:

• Coating type

• Coating thickness

• Corrosion environment

• Coating damage during swaging

• Galvanic compatibility

• Hydrogen embrittlement risk where applicable

• Inspection requirements

No zinc-plating specification, salt spray rating or corrosion service life is claimed without verification.

Engineering Solution 13 — Grip Range and Pin Length Selection

The correct pin length must accommodate the combined thickness of the connected components and the required collar engagement.

Engineers should confirm:

• Minimum joint thickness

• Maximum joint thickness

• Pin grip range

• Collar dimensions

• Locking groove engagement

• Installation tail geometry

• Tooling clearance

• Final pin projection

Incorrect grip selection may prevent complete collar swaging.

Engineering Solution 14 — Mounting-Hole Diameter and Joint Preparation

Hole dimensions affect mechanical performance and installation consistency.

Important parameters include:

• Hole diameter

• Hole tolerance

• Hole alignment

• Edge distance

• Fastener spacing

• Burr condition

• Surface cleanliness

• Joint gap

Oversized, cracked or damaged holes must not be accepted without engineering approval.

Engineering Solution 15 — Break-Pintail and Pintail-Less Designs

Not all ring-groove lockbolts use the same installation sequence.

Break-Pintail Lockbolts

These designs include an installation section that breaks at a designated location after the required installation sequence.

Pintail-Less Lockbolts

These designs use a different installation system that completes the collar swaging operation without a conventional break-off pintail.

Huck BobTail is an example of a proprietary pintail-less system.

The JUXIN JX-D-L-ST configuration must be checked against its actual drawing before assigning either design.

Engineering Solution 16 — Installation Tooling

Steel locking-collar rivets require compatible installation tooling.

Tool selection should consider:

• Pin diameter

• Collar diameter

• Pin geometry

• Required pulling force

• Swaging force

• Tool stroke

• Nose assembly

• Working clearance

• Production cycle time

• Tool maintenance

• Operator safety

The correct tool and nose assembly are essential to consistent installation.

A conventional blind-rivet tool should not be assumed suitable.

Engineering Solution 17 — Production Quality Control

For production managers and manufacturing engineers, reliable steel lockbolt assembly requires controlled components, tooling and inspection.

Important quality-control items include:

• Approved pin part number

• Approved collar part number

• Pin material verification

• Collar material verification

• Dimensional inspection

• Hole diameter

• Grip range

• Collar orientation

• Tool identification

• Nose assembly condition

• Swage completion

• Installed collar dimensions

• Pin projection

• Pintail break condition, if applicable

• Joint gap

• Material traceability

Production validation should be performed before high-volume assembly where required.

Engineering Solution 18 — Metric and Inch Size References

Common industrial lockbolt diameter references include:

These are general dimensional references, not confirmed available sizes for JX-D-L-ST.

Actual pin diameters, hole sizes, collars and installation tools must be verified before substituting metric and inch-designated fasteners.

Industrial Applications and OEM Engineering Solutions

The following applications are potential engineering uses, subject to approval of the actual fastener system and joint design.

1. Commercial Truck Manufacturing

Steel lockbolts may be evaluated for approved metal assemblies in commercial trucks, where vibration, fatigue and permanent fastening are relevant.

2. Trailer Manufacturing

Trailer manufacturers may consider steel locking-collar fasteners for selected structural frames, brackets and metal connections.

3. Heavy Construction Equipment

Heavy equipment manufacturers may evaluate steel lockbolts for mechanically demanding assemblies exposed to vibration and repeated loading.

4. Agricultural Machinery

Agricultural machinery may use permanent pin-and-collar fastening in suitable frames, brackets and structural equipment components.

5. Rail Equipment

Rail equipment manufacturers may consider lockbolt systems where permitted by approved engineering specifications. Fatigue, vibration and project-specific requirements must be verified.

6. Industrial Steel Structures

Steel lockbolts may be evaluated for structural connections where the fastener system has the necessary engineering qualification and applicable approvals.

7. Industrial Machinery Frames

Machinery frames and equipment supports may require permanent fastening with controlled installation procedures.

8. Material Handling Equipment

Conveyor systems and material handling machinery may use suitable steel lockbolt assemblies where joint loading and installation access permit.

9. Mining Equipment

Mining equipment may contain mechanically demanding steel assemblies requiring evaluation of fatigue, corrosion and impact loading.

10. Industrial Vehicle Equipment

Industrial vehicles and specialized transport equipment may use approved steel pin-and-collar connections.

11. Container and Modular Equipment

Steel containers and modular equipment may incorporate structural brackets, frames and permanent metal joints.

12. Power Infrastructure

Power equipment frames and auxiliary structural supports may be evaluated for steel lockbolt fastening where electrical and mechanical requirements are satisfied.

13. Energy Storage Equipment

Energy storage infrastructure may use steel equipment frames and support assemblies. Electrical isolation and structural qualification must be reviewed separately.

14. AI Data Center Infrastructure

Large data center infrastructure may include equipment supports, mechanical frames and auxiliary structural assemblies where two-sided fastening access is available.

15. Industrial Enclosures

Heavy-duty industrial enclosures may use steel lockbolts for suitable frame and structural connections.

16. Custom OEM Metal Fabrication

OEM manufacturers may specify steel locking-collar rivets according to approved drawings, installation requirements and annual production volumes.

Application Selection Matrix

Common Installation Problems and Corrective Checks

International Standards and Technical Qualification

Steel lockbolts may be specified using manufacturer technical specifications, customer-approved drawings and applicable industry standards.

The term locking-collar rivet does not identify one universal standard covering every pin-and-collar system.

Different designs may use different:

• Pin geometries

• Groove profiles

• Collar configurations

• Material grades

• Head styles

• Grip ranges

• Installation procedures

• Mechanical performance requirements

Where ISO, DIN, EN, ASTM, SAE or customer-specific requirements apply, conformity must be verified against the actual product.

Huck Magna-Grip and Huck BobTail are proprietary systems. Similar appearance or generic terminology does not establish equivalence.

No unverified standard conformity, proprietary interchangeability or certification is claimed.

OEM Procurement and Supplier Development

Purchasing managers, supply chain managers and supplier development engineers should specify steel lockbolts as matched pin-and-collar fastening systems.

A complete RFQ should include:

• Pin drawing

• Collar drawing

• Steel material specifications

• Pin diameter and length

• Head style

• Groove configuration

• Grip range

• Mounting-hole dimensions

• Shear and tensile requirements

• Clamp requirements

• Fatigue requirements

• Surface coating

• Installation tooling

• Inspection criteria

• Expected order volume

• Annual demand forecast

Purchasing teams should confirm whether the quotation includes pins, collars or complete matched assemblies.

The total installed cost should consider component price, tooling, installation time, quality inspection and maintenance.

Frequently Asked Questions

What are steel locking-collar rivets?

They are two-piece mechanical fasteners consisting of a grooved steel pin and a compatible locking collar that is swaged into the pin grooves.

Are steel locking-collar rivets also called lockbolts?

Yes. Steel lockbolts is a widely used engineering term for this type of fastening system.

Are steel lockbolts the same as blind rivets?

No. Typical two-piece lockbolts require access to both sides of the joint, while conventional blind rivets are installed from one side.

Are lockbolt pins and collars interchangeable between manufacturers?

Not automatically. Groove geometry, collar material, dimensions and tooling must be verified.

Does every steel lockbolt have a break-off pintail?

No. Break-pintail and pintail-less designs use different installation mechanisms.

Are these products equivalent to Huck Magna-Grip?

Equivalence has not been established. Any proposed substitution requires engineering verification.

Are steel lockbolts suitable for vibration-exposed equipment?

They may be suitable when the selected fastening system and complete joint have been properly qualified.

Are the steel pins and collars zinc plated?

The original JUXIN product information does not confirm the coating. Surface finish must be specified and verified.

Can JUXIN supply the pin and collar as a complete set?

The required matched pin-and-collar configuration can be submitted for supply feasibility review and quotation. Packaging and supply scope should be confirmed in the quotation.

Can JUXIN review custom steel lockbolt drawings?

Yes. Customers may submit drawings, material requirements, dimensions and performance criteria for technical evaluation and quotation.

Request a Steel Locking-Collar Rivet OEM Quotation

JUXIN FASTENERS supplies industrial fastening solutions for OEM manufacturing, commercial vehicle production, heavy equipment and metal fabrication projects.

Please provide the following information for technical review:

• JUXIN reference: JX-D-L-ST

• 2D engineering drawing or 3D CAD model

• Steel pin grade

• Steel collar grade

• Pin diameter and length

• Head geometry

• Ring-groove profile

• Grip range

• Mounting-hole diameter and tolerance

• Required shear strength

• Required tensile strength

• Clamp and fatigue requirements

• Break-pintail or pintail-less design

• Installation tooling and nose assembly

• Surface coating and corrosion requirements

• Inspection and traceability requirements

• Pin and collar supply quantities

• Expected annual demand

• Packaging specifications

• Target delivery schedule

Email: info@juxinfasteners.com

Website: https://www.juxinfasteners.com/

JUXIN FASTENERS — Steel Locking-Collar Rivets and High-Strength Lockbolts for Global OEM Manufacturing.

Packaging Standard

At Juxin Fasteners, we apply standardized export packaging to ensure product protection, traceability, and compliance with international logistics requirements.

1. Standard Export Packaging

Unless otherwise specified, all products will be packed according to our factory standard export packaging, which includes:

Moisture-resistant inner protection

Poly bag or small box packing as required

Reinforced export cartons

Clear labeling with part number, specification, batch number, and quantity

Palletizing for sea or air shipment when necessary

Our standard packaging is designed to ensure safe transportation, efficient warehousing, and long-distance international shipping.

2. Customized Packaging Options

We also provide customized packaging solutions according to customer requirements, including but not limited to:

Private labeling

Customized barcodes

Specific carton dimensions

Retail packaging

Special pallet configuration

Customer-specific marking and identification

So that you know, customized packaging may involve additional costs and extended lead time depending on the complexity of the requirements.

3. Compliance & Quality Assurance

All packaging processes are controlled under our ISO 9001 quality management system to ensure consistency, traceability, and product integrity throughout the supply chain.