Partial Thread Screw becomes an indispensable standard machine fastener across diversified modern industrial assembly fields. Differing from fully threaded machine screws, it is structured with smooth unthreaded shank on upper shaft and precision rolled machine thread at the tail end. Growing demands for thick sheet metal splicing, fragile plastic shell fixation and precision jig assembly push global manufacturers to replace full thread screws with qualified Partial Thread Screw to solve common assembling defects like hole scratching, plastic cracking and over-tightening damage.
Full-thread screws easily scratch inner bore of through-hole or split thin plastic during tightening, while the plain shank design of Partial Thread Screw slides freely inside pre-drilled holes without damaging workpiece base material, greatly lowering finished product reject rate during mass production.
1. Electronic Cabinet & Equipment Rack Assembly
Large-sized electrical cabinets and mechanical equipment frames mostly adopt thick cold-rolled steel plates for splicing installation. Partial Thread Screw runs through sheet metal through hole with smooth shank staying inside bore, and tail thread locks into pre-tapped bottom base.
Working requirements
• High shear resistance to resist long-term equipment running vibration
• Zinc-plated anti-rust surface to adapt humid factory workshop environment
• Fixed shank length limits screwing depth to prevent plate surface indentation
Matching product
Carbon steel zinc plated Partial Thread Screw, cross recess pan head, mainstream metric specs M3~M12, customized unthreaded shank length based on actual board thickness.
Testing instruments, power supply casings and small household electrical equipment widely use plastic outer shell matched with internal metal fixing brackets. Thin plastic material is prone to crack under squeezing force from full thread screws, making Partial Thread Screw the preferred fastener for plastic-metal combined connection.
Working requirements
• Smooth shank prevents radial extrusion crack on plastic hole edge
• Moderate thread hardness to avoid sliding teeth during repeated disassembly
• Multiple surface finish options to match shell appearance demand
Matching product
304 stainless steel polished Partial Thread Screw, compact round head, customizable thread pitch for various plastic component assembly.
3. Precision Jig & Machining Fixture Fastening
Mechanical processing production line fixtures, positioning molds and clamping tools need accurate locking stroke control. The fixed-length plain shank of Partial Thread Screw acts as natural limit stop; operators stop screwing once shank end face touches workpiece surface, effectively avoiding excessive compression of precision fixture parts.
Working requirements
• High tensile strength to bear cyclic clamping load
• Stable dimensional tolerance for consistent positioning accuracy
• Black oxide surface to resist cutting fluid corrosion on processing site
Matching product
10.9 grade high-strength carbon steel blackened Partial Thread Screw, hex socket head for big torque locking.
4. Fastener Combination With Flat & Spring Washers
For assembly needing shock absorption and anti-loosening, customers equip Partial Thread Screw with flat washer and spring washer. Unthreaded shank section fixes washers in position to avoid washer shifting and extrusion deformation during tightening.
Working requirements
• Uniform shank outer diameter to stably clamp supporting washers
• Consistent thread dimension to cooperate with standard spare washers
Matching product
Electro-galvanized standard Partial Thread Screw, full set supporting assorted size washers for one-stop procurement.
5. New Energy Equipment Internal Component Mounting
New energy storage cabinets, small battery pack inner frames and controller housings adopt mixed plastic-metal structures, where anti-crack and stable fastening are core requirements, driving rising bulk order volume of customized Partial Thread Screw.
Working requirements
• Excellent salt spray resistance for long-term outdoor equipment service
• Custom head type to fit narrow internal installation space
Matching product
Passivated 316 stainless steel anti-corrosion Partial Thread Screw, low-profile thin head design for compact layout installation.
Core Advantages Of Qualified Partial Thread Screw
Inferior irregular half-thread fasteners easily bring hidden troubles including workpiece cracking, loose connection and thread sliding under continuous vibration and temperature change. Premium grade Partial Thread Screw undergoes precise cold heading and thread rolling processing: smooth shank keeps intact circular dimension, standardized machine thread guarantees uniform locking force. It helps manufacturers cut post-assembly maintenance cost and upgrade overall production assembly efficiency for batch production.
Manufacturing Strength & Production Parameter Range
We own over 28 years specialized precision fastener manufacturing experience, capable of custom developing non-standard size Partial Thread Screw to satisfy multi-industry personalized fastening demands from global B2B buyers.
Raw material: Carbon Steel, 304/316 Stainless Steel, Brass, 6061 Aluminum Alloy
Thread standard: Metric M2~M20, Inch UNC/UNF, customized non-standard pitch available
Head options: Cross recess, Hex socket, Pan head, Round head, Countersunk head
Surface treatment: Zinc plating, Black oxide, Nickel plating, Passivation, Color anodizing
Custom service: Shank length customization, special surface coating, dimension drawing-based OEM production
Strict Factory Quality Control
All finished Partial Thread Screw items go through full-automatic optical appearance inspection to check shank smoothness, thread integrity and surface flaw. Raw material chemical composition is verified via spectral analysis; tension, torsion and hardness tests follow international industrial standards. Finished goods complete 48~72 hours salt spray anti-corrosion testing, with production system certified by ISO9001, ROHS and REACH specifications.
Practical Customer Application Case
One domestic new energy equipment manufacturer originally used full thread screws for battery plastic housing assembly, facing over 8% monthly plastic crack rejection rate. After switching to customized M5*0.8 pitch stainless steel Partial Thread Screw with designated unthreaded shank length, product cracking rate drops below 0.5%, saving over 30% of component replacement cost monthly for the client. The optimized fastening solution improves their final product yield greatly and establishes long-term repeat bulk order cooperation.
Summary
Small-sized Partial Thread Screw delivers prominent practical value for modern lightweight industrial assembling. As more industries shift toward thin-wall plastic and thin sheet composite structural design, the demand for anti-crack, depth-controllable half-thread fasteners keeps rising year by year.
Supported by mature production technique, strict QC management and flexible OEM customization service, our factory supplies standard and bespoke Partial Thread Screw covering sample trial order and large-volume bulk purchase demands for global machinery, electronic, new energy and fixture clients.
Send online inquiry to acquire detailed product specification sheet, customized fastening solution and free sample supply offer.
Post time: Jun-10-2026
