1. Product Overview
We deliver one-stop customized Injection Mold development and PP circular snap washer injection molding service. This four-lug plastic snap retaining ring is integrally molded from virgin PP raw material, paired with tailor-made Injection Mold processed from 738H pre-hardened mold steel at hardness HRC35~40. The Injection Mold adopts 1×2 dual-cavity layout to produce 2 pieces of snap washers per single molding cycle for balanced medium-batch production. It combines dual feeding system: submarine hidden gate for appearance surface and side gate for thick-wall lug position to optimize plastic filling balance. All core & cavity surfaces go through precision polishing treatment; each finished Injection Mold passes strict dimensional inspection before shipment to guarantee stable long-run PP mass production.
2. Technical Specification Table
| Item | Detailed Specification |
| Molded Product | PP Circular Snap Washer / 4-Lug Retaining Ring |
| Molding Raw Material | Virgin PP Polypropylene |
| Mold Cavity Layout | 1×2 Double Independent Cavity |
| Core & Cavity Mold Steel | 738H Pre-hardened Mold Steel |
| Steel Hardness | HRC35~40 |
| Cavity Surface | High Gloss Polished Finish |
| Gating Design | Combined Submarine Gate + Side Gate Dual Runner System |
| Cooperation Mode | OEM/ODM Custom Injection Mold + Bulk Plastic Molding |
![Plastic Circular Snap Washer Mold]( "Plastic Circular Snap Washer Mold")
3. Core Advantages of Mold & PP Snap Washer
✅ Stable 738H HRC35-40 Injection Mold
738H pre-hardened mold steel features uniform internal hardness at HRC35-40, excellent machinability and superior polishing performance without post quenching heat treatment, effectively shortening mold production lead time. Its stable wear resistance supports long-term continuous PP injection and prolongs overall service life of the whole Injection Mold. Polished cavity avoids surface flow lines, sink marks and burrs to reduce defective rate of snap washers.
✅ 1×2 Double-Cavity Cost-Efficient Layout
Two finished circular snap washers are completed per injection shot, balancing production efficiency and mold manufacturing cost. Ideal for medium-volume order and new product iterative trial production, compared with single cavity it cuts down unit molding cost greatly.
✅ Dual Submarine + Side Hybrid Gate System
Submarine hidden gate is arranged on the smooth annular main body to auto-break during ejection without residual gate mark on visible surface; side gate is set on thick mounting lugs to ensure full plastic filling at four positioning tabs, preventing short-shot or shrinkage defect on snap lug structure.
✅ Practical 4-Lug Snap Washer Structure
Four evenly distributed outer lugs realize snap-fit locking and anti-rotation positioning after assembly; integrated engraved logo mark on single lug eliminates extra post-printing procedure. Virgin PP brings outstanding chemical resistance, lightweight and good toughness for durable spacing & locking performance on equipment assembly.
✅ Full Customization Support
We adjust ring inner/outer diameter, lug width/thickness and logo content on the Injection Mold strictly according to clients’ 2D/3D drawings or physical samples, available for material switch to ABS/PA6 upon requirement.
4. Main Application Fields
Small motor end cap locking retaining washer
Household appliance gearbox internal locating snap ring
Mini bearing outer plastic fixing spacer
Water pump & pneumatic equipment assembly gasket
5. Standard Custom Service Flow
Client provides 3D drawing or physical snap washer sample →2. DFM analysis & Injection Mold structural design →3. CNC precision machining + cavity polishing for 738H core and cavity →4. Dual submarine & side gate runner machining + mold assembly →5. Virgin PP trial injection & sample confirmation →6. Mass production after customer sample approval
FAQ Section
Q1: How many molding shots can this 738H Injection Mold sustain?
A: With regular daily maintenance, the HRC35-40 738H Injection Mold can steadily achieve over 420,000 shots for PP snap washer continuous production.
Q2: Can we revise lug dimension or logo pattern on finished Injection Mold?
A: Our in-house mold workshop can modify mold inserts to adjust lug size or update engraved mark based on revised technical drawings.
Q3: Can customers get pre-production trial samples before bulk molding?
A: Yes, we arrange PP prototype samples after mold completion for your dimension and appearance quality inspection.
Q4: Can this Injection Mold adapt ABS/PA6 material besides PP?
A: After fine-tuning injection parameters and gate flow optimization, this mold supports ABS or PA6 snap washer molding with our professional technical evaluation.
