Zhejiang Huayuan Automotive Technology Co., Ltd.

Combination fasteners consisting of a bolt or screw pre-assembled with a spring washer and a flat washer. The enlarged bearing surface maintains axial tension during service and increases friction against the workpiece, providing secure fastening with anti-loosening performance; since the components are pre-assembled, installation is faster and more efficient.

Size: M5-M12; Mechanical property class: 8.8-12.9

• Structural fastening of vehicle body and chassis
• Fastening of automotive electrical and electronic parts
• Structural fastening in machinery, power and marine equipment

Self-tapping screws for locking thin metal sheets and plastic parts in automotive interior and exterior trim. They offer strong self-tapping and anti-loosening capability, with the required mechanical properties obtained through carburizing or quench-and-temper heat treatment.

Series: ST/NST/PF/PT-H/PT-K/TP; Thread size: ST2.2-ST4.8 (typical); Heat treatment: carburizing, quench and temper

• Locking of thin metal sheets in automotive interior trim
• Locking of automotive plastic parts

Pin shafts machined into various complex shapes and structures to meet different service requirements of parts, widely used for functional connections in limit stops, positioning, guide pins and rotating locations of automotive interior and exterior trim.

Diameter range: Φ3mm-Φ24mm; Mechanical properties: customized to customer requirements

• Limit and positioning locations in automotive trim
• Functional connections for guide pins and rotating parts

Screws for locking and joining automotive interior and exterior structures. Common internal drive types include Phillips, hex socket, hexalobular socket and twelve-point spline, adapting to complex assembly conditions. The proprietary high-efficiency thread-rolling screw HY-SCPT2012(TM)M, a high-strength triangular-thread self-locking fastener, forms a precision internal thread on the mating part through surface hardening or local induction quenching, achieving clearance-free fits with secure fastening and anti-loosening.

Size: M3-M12; Property class: 4.8-12.9; Drive types: Phillips, hex socket, hexalobular socket, twelve-point spline

• Locking connections in automotive interior and exterior structures
• Threaded joints requiring self-locking

High-strength welding pin shafts formed by cold heading combined with precision CNC machining. Overall heat treatment (ultra-high-speed oil quenching plus medium-temperature tempering) delivers high strength and toughness, while low-carbon alloy steel markedly improves weldability.

Diameter range: Φ10mm-Φ30mm; Mechanical properties: above 1000MPa; Forming process: cold heading + precision CNC machining; Heat treatment: overall quenching + medium-temperature tempering

• Welded joints on vehicle body and chassis
• High-strength load-bearing connections

Bushings for rotating locations between automotive interior and exterior structures. Precise shaft-to-bushing fit delivers smooth rotation while fit clearances are minimized, reducing wobble and abnormal noise.

Diameter range: Φ5mm-Φ30mm; Mechanical properties: customized to customer requirements

• Rotating locations in automotive interior and exterior structures
• Precision bushing fits for noise reduction

Rivets for permanent fastening between non-detachable structures in automotive interior and exterior trim. The material requires good toughness for riveting together with certain tensile and shear strength to ensure structural safety under load.

Diameter range: Φ3mm-Φ20mm; Mechanical properties: customized to customer requirements

• Non-detachable joints in automotive interior and exterior structures

Welding bolts with weld points and threads designed for different welding methods and structural locations. Made of low-carbon alloy steel, they combine high strength with good weldability after heat treatment.

Size: M5-M12; Property class: 4.8-10.9; Material: low-carbon alloy steel

• Welded joints on vehicle body
• Welded fastening in powertrain systems

Welding nuts produced to GB national and other recognized standards, widely used for fastening in automotive interior structures. After welding they provide sheet metal parts with reusable threaded connection points.

Size: M5-M12; Property class: 6-10

• Fastening in automotive interior structures

Non-standard special-shaped bolts customized to customer drawings, a core category of special fasteners widely used for fastening in different functions and structures of automotive interior and exterior trim.

Size: M15-M12 (as shown on official site, presumably M5-M12); Property class: 4.8-12.9

• Fastening of special-shaped structures in automotive trim

General-purpose standard bolts produced to Chinese GB, automotive QC, American, German and Japanese standards, widely used for structural fastening in automobiles, electrical equipment, power systems, machinery, electronics, appliances and ships.

Size: M5-M24; Property class: 4.8-12.9; Standards: GB, QC, ANSI/ASME, DIN, JIS

• Vehicle body and chassis fastening
• Structural fastening in electrical, power, machinery and marine fields

Thread-locking bolts with pre-applied adhesive for threaded connections. Adhesive types include NYLOK, Precote, 3MI, ND and Loctite, complying with DIN-267 PART 27, IFI-125 and WX200; widely used for thread locking in automotive, electrical, power, machinery and electronic structures.

Size: M3-M12; Property class: 4.8-12.9; Adhesive types: NYLOK, Precote, 3MI, ND, Loctite; Standards: DIN-267 PART 27, IFI-125, WX200

• Anti-loosening of automotive threaded joints
• Thread locking in electrical and appliance structures

Non-standard welding nuts customized to customer drawings, widely used for fastening in different functions and structures of automotive interior and exterior trim.

Size: M5-M12; Property class: 6-10

• Fastening of non-standard structures in automotive trim

Stamped functional accessories including flat washers, spring washers, wave washers, retaining rings, thrust retaining rings, special-shaped gaskets, self-lubricating bushings, cotter pins and hoop clamps, produced to customer-specific dimensions and properties.

Sheet thickness: 0.5-4.0mm; Dimensional tolerance: ±0.1mm; Material grades: SPCC/SUS304 (typical); Mechanical properties: customized to customer requirements

• Functional accessories in automotive trim (washers, retaining rings, cotter pins, hoops, etc.)

Non-standard step bolts commonly used for fastening at rotating locations in automotive interior and exterior structures, offering high tensile and shear strength.

Size: M5-M12; Property class: 8.8-12.9

• Fastening at rotating locations in automotive trim

Various metal buckles for snap-fitting and locking between metal and plastic parts in automotive interior and exterior structures, produced to customer-specific dimensions and properties.

Sheet thickness: 0.8-2.5mm; Assembly pull-out force: ≥100N; Neutral salt spray test: 48h (typical); Mechanical properties: customized to customer requirements

• Snap-fit locking of metal and plastic parts in automotive trim

General-purpose standard nuts produced to Chinese GB, automotive QC, American, German and Japanese standards, widely used for structural fastening in automobiles, electrical equipment, power systems, machinery, electronics, appliances and ships.

Size: M3-M24; Property class: 6-10; Standards: GB, QC, ANSI/ASME, DIN, JIS

• Vehicle structural fastening
• Structural fastening in electrical, machinery and marine fields

Plastic parts widely used for flexible connections in automotive interior structures, injection-molded to customer-specific requirements.

Material: PA66+GF30 (typical); Operating temperature: -40~85°C; Flammability rating: UL94 V-0 (typical); Mechanical properties: customized to customer requirements

• Flexible connections in automotive interior structures

New-structure seat latch (recliner locking mechanism) Series X, supporting two release modes — release lever, or cable plus release lever — and fitting Φ8/Φ10 striker pins for seat backrest angle locking in vehicles.

Release force: 10N~49N; Locking force: ≤50N; Static strength F1: ≥25KN; Static strength F2: ≥10KN; Static strength F3: ≥10.5KN; Durability: ≥7000 cycles; Critical release travel: 16.9mm(33.8°); Unit weight: 228g; Tolerance: ±4mm/±3mm; Striker pins: Φ8, Φ10

• Seat backrest angle locking in vehicles
• Front and rear seat locking mechanisms

New-structure seat latch Series W with cable release, offered in two grades (≤85N / ≤49N release force) and a 5.5° adjustment angle, for seat backrest angle adjustment and locking.

Release force: ≤85N, ≤49N; Locking force: ≤120N; Static strength F1: ≥25KN; Static strength F2: ≥13KN(45°); Static strength F3: ≥8KN; Durability: ≥8000 cycles; Critical release travel: 13.6mm, 17.5mm(32.1°); Unit weight: 565g, 899g; Adjustment angle: 5.5°; Striker pin: Φ8

• Seat backrest angle adjustment and locking
• Fine-angle seat adjustment mechanisms

New-structure seat latch Series D with release-lever unlocking, fitting Φ8/Φ10 striker pins and reaching static strength F1 of 25/35KN for seat backrest angle locking.

Release force: 10N~49N; Locking force: ≤70N; Static strength F1: ≥25/35KN; Static strength F2: ≥4.55KN; Static strength F3: ≥10.5KN; Durability: ≥7000 cycles; Critical release travel: 20.3mm(39.4°); Unit weight: 373g; Tolerance: ±4mm/±3mm; Striker pins: Φ8, Φ10

• Seat backrest angle locking
• High-strength seat locking scenarios

Traditional-structure seat latch Series J with cable release, cable tolerance ±3.8mm, fitting Φ8 striker pins for seat backrest angle adjustment and locking.

Release force: 29.4±9.8N; Locking force: ≤294N; Static strength F1: ≥22KN; Durability: ≥7000 cycles; Critical release travel: 18mm; Unit weight: 496g, 531g; Cable tolerance: ±3.8mm; Striker pin: Φ8

• Seat backrest angle adjustment and locking
• Cable-release seat latch applications

Traditional-structure seat latch Series C with compact overall dimensions of 125*70*22mm and 0° static strength of at least 23KN, for seat backrest locking.

Release force: ≤49N; Locking force: ≤294N; Static strength F(0°): ≥23KN; Static strength F(80°): ≥10.5KN; Durability: ≥5000 cycles; Critical release travel: 8.0mm; Maximum release travel: 9.6mm; Mounting dimension: 102.2mm×36mm; Overall dimensions: 125×70×22mm; Unit weight: 410g

• Seat backrest locking
• Seat latches for compact installation spaces

Traditional-structure seat latch Series V supporting dual release modes — cable or release lever — offered in several weight versions (303g/400g/450g) and fitting Φ8/Φ9 striker pins.

Release force: 10N~49N; Locking force: ≤250N; Static strength F1: ≥23KN; Static strength F2: ≥10.5KN; Durability: ≥7000 cycles; Critical release travel: 11mm(21.5°); Unit weight: 303g, 400g, 450g; Tolerance: ±5mm, ±4mm; Striker pins: Φ8, Φ9

• Seat backrest angle locking
• Seat scenarios with multiple release modes

Traditional-structure seat latch Series T with encoder release mode, tolerance ±1.7mm, fitting Φ7 striker pins for seat backrest angle adjustment and locking.

Release force: 15N-35N; Locking force: ≤300N; Static strength F1: ≥25KN; Static strength F2: ≥20KN; Static strength F3: ≥12.5KN; Durability: ≥7000 cycles; Full release travel: 13.1mm(28.5°); Unit weight: 221g; Tolerance: ±1.7mm; Striker pin: Φ7

• Seat backrest angle locking
• Encoder-release seat latch scenarios

Traditional-structure seat latch Series E with lightweight dual-version design (153g/162g), supporting release-strap plus lever and encoder plus lever plus cable release modes respectively, fitting Φ6/Φ7/Φ8 striker pins.

Release force: ≤49N, 10N~35N; Locking force: ≤200N, 30N~100N; Static strength F1: ≥5KN, ≥10KN; Static strength F2: ≥5KN; Durability: ≥5000 cycles; Critical release travel: 12.1mm(28.5°), 8.4mm(28.5°); Unit weight: 153g, 162g; Tolerance: ±1.5mm, ±1.9mm; Striker pins: Φ6, Φ7, Φ8

• Seat backrest angle locking
• Lightweight seat latch scenarios

Floor latch Series G with cable release, static strength F3 up to ≥70KN, fitting Φ8/Φ10/Φ12.5/Φ15 striker pins, for locking the connection between vehicle seats and the body floor.

Release force: 29.4±9.8N; Locking force: ≤600N; Static strength F1: ≥30KN; Static strength F2: ≥35KN; Static strength F3: ≥70KN; Durability: ≥7000 cycles; Critical release travel: 10mm(19°); Unit weight: 430g; Tolerance: ±5mm; Striker pins: Φ8, Φ10, Φ12.5, Φ15

• Locking between vehicle seats and body floor
• High static strength floor fixing scenarios

Floor latch Series F with cable release and 30N~50N release force, fitting Φ8 striker pins, for vehicle seat-to-floor connection locking.

Release force: 30N~50N; Locking force: 80N~100N; Static strength F1: ≥30KN; Static strength F2: ≥30KN; Durability: ≥7000 cycles; Critical release travel: 14.7mm(31°); Unit weight: 220g; Striker pin: Φ8

• Vehicle seat-to-floor connection locking

Floor latch Series Q with cable release, dual-version design (593g/221g) and static strength F1 up to ≥32KN, fitting Φ12 striker pins.

Release force: ≤60N, 10N~49N; Locking force: ≤300N, ≤150N; Static strength F1: ≥32KN, ≥23KN; Static strength F2: ≥15KN, ≥4.5KN; Durability: ≥7000 cycles; Critical release travel: 9mm(19°), 7.5mm(18.5°); Unit weight: 593g, 221g; Tolerance: ±3mm; Striker pin: Φ12

• Vehicle seat-to-floor connection locking
• Dual-version floor latch scenarios

Automotive armrest and tool-box latch with complete test parameters covering locking force, durability, torque and opening angles, used for closing and opening of interior armrest boxes and tool or glove boxes.

Locking force: 4.86±0.45N; Durability: 11000 cycles; Torque: M1=4±2N·MM, M2=6±4N·MM; Opening angle: A1=3±3°, A2=25±3°, A3=45±3°; Test forces: F1=0.18N, F2=0.23N, F3=20N

• Central armrest box locking
• Tool box/glove box locking

Core gearbox assembly of the HDM product line; combined with the lead screw it forms the reduction drive unit of electric actuators such as seat adjusters.

Reduction ratio: 50-200:1 (typical); Output torque: ≤3N·m (typical); Operating noise: ≤55dB (typical); Operating voltage: DC12V (typical)

• Electric seat adjustment actuators
• Drive assemblies such as power tailgates

Lead screw assembly of the HDM product line, specification SGW Tr8×3(P1.5), length 330±0.5mm, with precise pitch and helix deviation control; paired with the gearbox for linear transmission in electric actuators.

Thread specification: SGW Tr8×3(P1.5); Length: 330±0.5mm; Major diameter: Φ8.0mm; Pitch: 1.5mm; Lead: 3mm; Number of starts: 2; Pitch diameter: 7.25mm; Normal thread thickness: 0.603-0.644mm; Helix deviation: ≤28μm; Cumulative pitch deviation: ≤36μm

• Linear transmission for electric seat adjustment
• Lifting/telescoping transmission in electric actuators

Body latch product line showcased in the application scenarios of the official website, covering hood locks, trunk/tailgate locks and door latch applications for body closures; belongs to the Huayuan lock product segment alongside seat latches.

Locking cycle life: ≥20000 cycles (typical); Release force: 40-60N (typical); Static strength: ≥10KN (typical); Operating temperature: -40~85°C (typical)

• Engine hood (front lid) locking
• Trunk/tailgate (rear lid) locking
• Door latching

Electrical connection product line corresponding to the electrical component connector application scenario and the HDM product segment of the official website; the HDM segment also covers gearboxes, lead screws and other electric actuator assemblies, serving intelligent automotive electronic system connection solutions.

Terminal current: ≤13A (typical); Operating voltage: DC12V/24V (typical); Contact resistance: ≤5mΩ (typical); Mating cycles: ≥100 (typical)

• Automotive intelligent electronic system connections
• Electrical component connector applications