Slotted Nuts Suppliers

Zhejiangxinye Automobile Technology Co., Ltd. has produced automotive fasteners and stamping parts from its Jiaxing Port Area plant since 1995 and today works as Custom Slotted Nuts Suppliers, Exporter for wheel-end, suspension, steering and general machinery assemblies. Slotted nuts sit inside a wider nut programme covering more than 500 product varieties, produced in-house from raw material analysis through finished-part mechanical performance testing under IATF 16949-2016.

How a Slotted Nut Holds a Joint

A slotted nut carries castellations cut across the top face so a cotter pin, split pin or safety wire can pass through the slots and through a cross-drilled hole in the mating stud. The lock is mechanical and does not depend on prevailing torque, which is why slotted nuts are specified where vibration, thermal cycling or restricted access make re-torque impractical.

• Positive retention that remains effective after the joint relaxes under load
• Disassembly and re-assembly without destroying the thread or the locking element
• Locking condition visible at inspection — the pin is present or it is not
• Slot-to-hole alignment must be engineered into the stud and nut pairing, not forced at assembly
• Slot edges require deburring; sharp corners act as stress raisers on the pin

Our Slotted Nut Range and Configuration

The listed catalogue item is the Carbon Steel Hex Flanged Slotted Nut, a hexagon body with an integrated bearing flange and castellations, used where washer retention and pin locking are both required. Tools, thread sizes, slot counts and flange geometry beyond that item are quoted against drawing through our Non-Standard Nuts capability, which runs on the same cold heading and tapping lines as the standard range.

• Body form: hexagon, hexagon with flange, cylindrical, or a drawing-specific outline
• Thread: metric coarse or fine pitch, unified threads, left-hand threads on request
• Castellation: number of slots, slot width and depth, radial or angled entry
• Bearing face: flat flange, chamfered, or with a controlled contact annulus
• Material and property class selected against the axial load and the mating stud
• Marking, surface finish and packaging specified per release

Application Fit Across Vehicle and Machine Assemblies

Slotted nuts suit joints that combine a drilled stud with a pin, especially where the nut must be locked at a specific angular position rather than at a fixed torque. Our automotive work is concentrated in wheel-end, chassis and interior structures, and the same nuts transfer directly to off-highway equipment, agricultural machinery and industrial drives.

• Axle and hub retaining positions locked by split pin
• Steering tie rod ends, ball joint studs and drag link pivots
• Suspension link pins and stabiliser connections
• Prop shaft, yoke and coupling joints subject to torsional cycling
• Seat frames, adjustment pivots and body mechanism pins
• Trailer, lifting and general mechanical assemblies with pin-locked fastening

Materials, Strength and Surface Performance

Material selection follows the property class and the environment. Carbon steel covers general chassis and body positions; alloy steel is used as strength rises; plating and temperature-resistant finishes follow the exposure of the joint. The control points below are those we define in the quotation for each slotted nut.

Nut Families We Supply Alongside Slotted Nuts

Most slotted nut projects sit inside a broader fastener schedule. We quote the combined requirement so thread sizes, materials and coatings stay consistent across the assembly.

Quality Control and Acceptance

Our management system is certified to IATF 16949-2016, supported by an environmental management system certification and work safety standardisation certification. Work instructions are issued for special and critical processes such as heading, heat treatment and thread forming, and inspection is placed at each production step rather than only at final release.

• Incoming raw material analysis before coils enter the heading machines
• Dimensional and gauge checks on thread, across-flats, flange and slot features
• Hardness testing with in-house hardness testers after heat treatment
• Finished-part mechanical performance testing against the specified property class
• Coating verification against the agreed salt-spray target
• Visual inspection of castellation edges, marking and thread condition

Information We Use to Configure Your Solution

A slotted nut quotation is only as precise as the joint data behind it. These inputs let us fix the material, tooling, coating and inspection plan before pricing.

• Drawing or standard reference, including thread size, pitch and thread hand
• Property class and material grade, and the mating stud specification
• Castellation arrangement: slot count, width, depth and position relative to the drilled hole
• Flange or bearing-face geometry and the surface it seats against
• Coating system, salt-spray target and any operating temperature
• Annual volume, release frequency and container or packaging requirement
• Marking, labelling, documentation set and required language
• Assembly method — manual, pin-fed or automated press and driver tooling

Documentation, Packaging and Delivery Scope

Nuts are supplied bulk-packed or in ordered containers with the marking agreed at quotation, and shipped from Jiaxing Port Area with the inspection and material records for the released batch. Our engineering team supports drawing review before tooling is committed, and confirms the installation guidance for castellation alignment so the pin seats correctly at the specified torque. Slotted nuts are quoted together with the rest of the complete nuts range when a project spans several positions.

Frequently Asked Questions

When should a slotted nut be used instead of a self-locking nut?

Choose a slotted nut when the mating stud can be cross-drilled and the joint needs a lock that stays effective after preload relaxes, or where the nut must be locked at a particular angular position. Self-locking nuts suit joints without a drilled stud and rely on prevailing torque instead of a pin.

Can you produce slotted nuts to our own drawing rather than a catalogue item?

Yes. Custom bodies, slot arrangements, flange geometry, thread forms and coatings are quoted from drawing through our non-standard nut capability, using the same cold heading, tapping, thread rolling and heat treatment equipment as the standard slotted range.

Which strength classes can you deliver for slotted nuts?

Production has progressed from Class 5 and Class 8 to Class 12, and Class 13–14 ultra-high-strength nuts have completed pre-research. The class is confirmed against the axial load of the joint and the grade of the mating stud.

What coatings and corrosion performance do you offer?

Trivalent zinc plating tested to 480 h salt spray and Zn-Ni alloy plating tested to 480–720 h salt spray, all from our in-house surface finishing line. Temperature-resistant finishes are available in 300 °C, 550 °C and 650–700 °C grades for exhaust and engine-periphery positions.

How is slot-to-hole alignment handled at assembly?

Slot position is controlled during forming and checked as a dimensional feature, and the tightened nut should present a slot to the cross-drilled hole within the specified torque window. Where the window is tight, we review slot count, stud hole position and washer thickness with your engineering team before tooling release.

What leads a slotted nut quotation?

Drawing or standard reference, thread and property class, slot and flange geometry, coating and temperature, annual volume with release pattern, and the marking and documentation package. With those defined, we confirm tooling, inspection plan and delivery scope in the offer.