Fasteners & connection components,
made measurable.
Ten product families engineered for the world's most demanding joints. Expand any family for the technical detail — materials, sizes, finishes and the industries where it performs.
High-strength aluminum alloy bolts
Cold-headed aluminum bolts — including our flagship ZT68 series — deliver steel-level strength at up to 65% lower weight. Because their electrochemical potential matches magnesium and aluminum substrates, they eliminate galvanic corrosion without washers or isolation coatings, and their matched thermal expansion keeps joints tight under heat.
- ZT68: tensile ≥ 615 MPa · yield ≥ 490 MPa · elongation ≥ 8%
- Stable to 150 °C, 12 h endurance at ≥ 600 MPa
- Integral flange (bolt + washer in one) — fewer parts, less inventory
- Short 1.3–1.5d engagement enables thinner, lighter housings
Aluminum bolts are alloy-grade choices matched to the joint's strength and corrosion demands.
| Alloy | Position | Typical use |
|---|---|---|
| ZT68 (7xxx) | Ultra-high strength | Transmissions, Mg/Al housings, structural EV joints |
| 6056 (6xxx) | High strength | Grade 8.8 / 10.9-equivalent general light-alloy fastening |
| Surface | Anodized | Passes 60-day neutral salt spray; hard, wear-resistant |
| Surface | Lubricant coating | Total friction coefficient 0.09–0.15 for torque-angle control |
Verified performance on M8×35 test specimens (5 mm/min crosshead, uniform standard).
| Parameter | Typical value | Test |
|---|---|---|
| Thread sizes | M5 – M12 standard; M6×1.0 / M8×1.25 common | Custom per drawing |
| Tensile strength Rm | ≥ 615 MPa (avg. 629 MPa) | Tensile test |
| Yield strength Rp0.2 | ≥ 490 MPa (avg. 510 MPa) | Tensile test |
| Elongation Af | ≥ 8% | 2d gauge |
| Failure torque | > 25 N·m (M8×35) | Torque to failure |
| Hardness | HV 202 – 209, uniform | Vickers |
| Thermal endurance | 150 °C / 12 h at ≥ 600 MPa | Thermal exposure |
- Electric & hybrid drivetrains — transmission and e-motor housings in Mg or Al die casting
- Battery trays, converters and structural light-alloy assemblies
- Two-wheelers, motorcycles and lightweight vehicle programs
- Low-altitude platforms and any weight-critical structure
Micro precision screws
Micro fasteners from M0.5 — manufactured to micron-level tolerances for consumer electronics that demand high strength, anti-vibration security, and non-magnetic, interference-free materials. Drive geometry is engineered for stable, automated screw-driving at high line speeds.
- Sizes from M0.5, lengths down to ~1 mm
- Non-magnetic grades for sensors and RF modules
- Stable drive seating — optimized for torque & angle assembly
- Full dimensional & drive inspection by CCD optical sorting
- Non-magnetic austenitic stainless (e.g. 303 / 316) for sensors, cameras and RF assemblies
- Martensitic / carbon grades where hardness matters more than magnetism
- Passivation, electropolish, nickel and custom coatings; friction-coefficient-controlled finishes
| Thread | Head styles | Drives | Typical length |
|---|---|---|---|
| M0.5 – M1.0 | Pan, flat, countersunk | Cross / Phillips, slotted, custom | 0.8 – 4 mm |
| M1.2 – M1.6 | Pan, flat, wafer, stepped | Cross, TORX®, hex | 1.5 – 8 mm |
| M1.7 – M2.0 | As above + shoulder | All standard + TORX PLUS® | 2 – 12 mm |
- Smartphones, tablets, notebooks and foldable devices
- Wearables, hearables, smart glasses and medical wearables
- Camera modules, haptics, speakers and micro-actuators
- High-volume SMT and automated assembly lines
Cutting-tool screws
The screw that decides tool performance. Our cutting-tool screws clamp carbide inserts firmly in CNC tool holders with a patented groove geometry that seats the driver deeper and transfers torque more evenly — so inserts stay locked under heavy interrupted cuts.
- Patented groove design ensures stable, repeatable drive
- Special X surface treatment prevents cold welding & galling
- Premium SCM435 alloy steel, Grade 12.9 high-strength
- Licensed TORX® / TORX PLUS® manufacturer
- SCM435 alloy steel, quenched & tempered to Grade 12.9 (HV 28–37 equivalent hardness range available)
- X surface treatment — hardened, anti-adhesion finish that prevents screw-to-driver cold welding
- Stainless steel versions for corrosive or clean environments
| Thread | Drive | Head type | Typical use |
|---|---|---|---|
| M1.6 – M2.5 | TORX PLUS® 5IP – 8IP | Flat countersunk | Micro turning & milling inserts |
| M2.5 – M4 | TORX PLUS® 10IP – 20IP | Flat / cone / socket | Indexable milling, turning, drilling |
| M4 – M6 | TORX PLUS® 25IP – 40IP | Socket / flange | Heavy machining, grooving, threading |
- CNC milling, turning, boring and drilling tooling
- Carbide insert clamping for automotive, aerospace & general machining
- Toolholder brands and cutting-tool OEMs worldwide
Blind rivet nuts & rivet bolts
Permanently install a strong threaded point in thin sheet metal, profiles, composites or plastic — from one side, in about three seconds. Ideal where the rear side is inaccessible, and engineered with anti-loosening features where vibration is the enemy.
- Single-sided, blind installation in ~3 seconds
- Creates strong threads in thin or soft materials
- Stabilized rivet-bolt & anti-loosening designs patented
- No access hole on the blind side, no tapping
- Carbon steel, stainless steel and aluminum bodies to suit substrate & environment
- Zinc, zinc-nickel (up to 480 h red-rust), passivation and dry-film lubricant options
- Knurled, hex and round body forms for pull-out resistance in different materials
| Type | Thread | Grip range | Head form |
|---|---|---|---|
| Rivet nut (internal thread) | M3 – M12 | 0.5 – 6 mm sheet | Flat, countersunk, flange |
| Rivet bolt / stud (external thread) | M4 – M10 | 0.5 – 5 mm sheet | Knurled body, headless |
| Heavy-duty | M8 – M16 | 1 – 8 mm | Per drawing |
- EV battery pack enclosures & service covers
- White goods, HVAC, automotive body panels & frames
- Electronics racks, enclosures and field-service joints
Thread inserts, wire inserts & bushings
When soft metal or repeated service destroys threads, inserts restore and even improve them. Wire-thread inserts create stronger internal threads than direct tapping, while threaded bushings repair damaged holes, convert thread standards, and add reusable, wear-resistant threads to aluminum and magnesium.
- Wire inserts from high-strength stainless wire
- Repair, size conversion & thread-standard change in soft metals
- Repeat disassembly without damaging the base material
- Anti-loosening versions with friction coatings for vibration
| Type | Function | Best for |
|---|---|---|
| Wire-thread insert | Free-running / locking internal thread | Aluminum, magnesium, plastics — strength & wear |
| Threaded bushing (nest) | Repair & thread-standard conversion | Damaged soft-metal holes, M4 – M20 |
| Insert with coating | Anti-loosening under vibration | Motors, machinery, aerospace-adjacent joints |
- Repairing stripped threads in die-cast housings on the production line
- Converting metric / inch threads without replacing components
- Giving aluminum & magnesium parts reusable, maintenance-friendly threads
Sleeves & custom cold-headed parts
Our signature combination — cold heading plus minimal secondary machining — turns "over-engineered" CNC parts into strong, low-cost, mass-producible components. The flagship is the 6061 aluminum lifting sleeve for EV battery packs: precision threads, continuous grain flow, and a 60% cost reduction over full CNC.
- Up to 98% material utilization — near-zero waste
- Unbroken grain flow = superior fatigue & fracture resistance
- Unit cost cut ~60%, output up to 5× vs. pure CNC
- Custom studs, pins, plungers, spacers & assemblies
- Aluminum 6061 & other light alloys for weight-critical components
- Carbon & alloy steels, stainless steel for strength-critical parts
- Anodizing, chromate, plating, pre-applied sealant/adhesive options
| Component | Function | Typical spec |
|---|---|---|
| 6061 lifting sleeve | Battery pack lifting, positioning & securing | Flanged hollow sleeve, precision top threads |
| Threaded studs & standoffs | Spacing & mounting | M3 – M12, custom length |
| Spring-loaded pins / plungers | Detent, retention, positioning | Ball & spring assemblies, steel or stainless |
| Combined male-female fasteners | Two-in-one joining | Patented inner-outer thread parts |
- EV & PHEV battery pack lifting and assembly stations
- Structural fastening in new-energy vehicles
- Any high-volume component currently over-priced by full CNC machining
Insert screws & captive panel fasteners
Captive screws engineered to install into self-clinching or moulded threaded inserts — holding service panels, racks and covers without spin-out. Their controlled head height and drive geometry suit automated assembly and repeated maintenance, keeping the panel secure while the screw stays attached to the cover.
- Captive design — the screw never separates from the panel
- Matched to self-clinching inserts and moulded-in nuts
- Low-profile head for flush, vibration-resistant panels
- Automation-friendly drive for high-volume lines
- Stainless steel (A2 / A4) for corrosion-resistant captive panels
- Carbon alloy steel with zinc-nickel plating for electronics enclosures
- Passivation, black-oxide and custom low-hydrogen coatings
| Thread | Head styles | Drives | Typical use |
|---|---|---|---|
| M2 – M3 | Pan / wafer captive | Phillips, Torx | Thin electronics covers |
| M4 – M6 | Pan / flat / countersunk | Phillips, Torx, hex | Racks & enclosure panels |
| M6 – M8 | Flanged / shoulder | Torx PLUS®, hex | Heavy-duty access panels |
- Server, networking and telecom racks
- Electronic enclosures and access covers that must stay attached
- Automotive interior and instrument panels
Sealing screws & watertight fasteners
Screws with a bonded elastomer seal that compresses under clamp load to form an IP67 / IP69K barrier around the joint. They seal housings exposed to water, dust and washdown without separate gaskets or loose O-rings, simplifying assembly and eliminating seal-loss during service.
- Integrated seal compresses to IP67 / IP69K rating
- Eliminates loose O-rings and extra sealing washers
- Temperature-stable seal for outdoor and under-hood use
- Corrosion-resistant bodies for washdown environments
- Stainless steel, brass or coated carbon steel bodies
- NBR, EPDM and FKM (Viton) seal compounds per temperature & fluid
- Bonded-in seal retained permanently on the screw head
| Thread | Seal material | Rating | Typical use |
|---|---|---|---|
| M3 – M6 | NBR / EPDM | IP67 | Indoor enclosures, LED lighting |
| M6 – M8 | EPDM / FKM | IP67 / IP69K | Outdoor & washdown housings |
| M8 – M12 | FKM | IP69K | EV battery & high-seal joints |
- Outdoor lighting and telecom junction boxes
- EV battery housings and power electronics
- Marine, food-processing and high-washdown equipment
Anti-loosening & lock fasteners
Joints that see vibration, thermal cycling or dynamic load need more than torque alone. Prevailing-torque threads, distorted locking sections and pre-applied patches hold residual preload stable — so the joint does not walk loose in service and maintains a consistent, inspectable breakaway torque.
- Prevailing torque keeps residual preload under vibration
- Nylon-insert, distorted-thread and pre-applied patch options
- Reusable where required; one-way where tamper evidence matters
- Consistent breakaway torque for production quality control
- Alloy steel to 8.8 / 10.9 / 12.9 grades
- Stainless steel for corrosive or clean environments
- Pre-applied nylon patch, micro-encapsulated patch or distorted thread
| Thread | Lock type | Behaviour | Typical use |
|---|---|---|---|
| M3 – M6 | Nylon patch | Reusable 5–15 cycles | Electronics & small assemblies |
| M6 – M10 | Distorted thread | High vibration | Motors, robotics & actuators |
| M10 – M16 | Two-nut / lock patch | Structural | Chassis, rail & heavy equipment |
- Electric motors, gearboxes and pumps
- Robot joints and actuators under cyclic load
- Automotive chassis and rail / off-highway equipment
Bonding screws & structural riveting
Where bolting is impractical, structural blind rivets and bonded screw combinations distribute load across sheet, extrusion or composite — creating rigid, vibration-proof joints from one side, without welding or heat distortion on soft substrates.
- Structural blind rivets set in seconds from one side
- High clamp force with no heat-affected zone
- Multi-grip bodies accommodate mixed sheet thicknesses
- Combined screw + rivet solutions for serviceable joints
- Steel, stainless and aluminum rivet bodies
- Pulled mandrel with locked spindle for shear strength
- Zinc-nickel or stainless finishes for corrosion resistance
| Diameter | Grip range | Head form | Typical use |
|---|---|---|---|
| 3/16" (M4.8) | 1 – 5 mm | Flange / countersunk | Thin sheet & panels |
| 1/4" (M6.4) | 2 – 8 mm | Large flange / sealing | EV enclosures & bodywork |
| Heavy structural | 3 – 12 mm | Multi-grip | Extrusions & composites |
- Bus, truck and trailer body panels
- EV battery enclosures and structural assemblies
- Sheet-metal enclosures and composite-to-metal joints
Even more in the full Toprecision catalog
The group catalog carries 130+ additional standard parts — browse the full range with complete specifications.
Don't see the fastener you need?
We develop custom solutions around customer drawings every week — cold-headed, machined, or a hybrid of both. Send us the print and we'll engineer the process.
