Long PA66 Nylon Gear Rack, 20 Degree Involute Profile, Full Length Machined
PA66 gear rack near 470 mm: 20 degree pressure angle involute teeth on an 18.5 mm pitch line, straightness 0.15 mm full length, 10-32 UNF ends, Ra 0.8 tooth faces. Quote in 24 hours.
Medical Devices
A long slender white nylon rack for medical mechanism motion transfer. Form milled full length on a four axis center with vacuum and long fixtures, gauge and CMM verified over the whole travel.
Or email drawings to kgl@kglmfc.com
Key Specifications
| Parameter | KGL Capability |
|---|---|
| Material | PA66 nylon (NYLON 6/6), white |
| Process | 4 axis CNC milling with vacuum and long fixtures, form milling of the full tooth profile, cold air cooling, micro deburring, stress relief and drying |
| Dimensions | approx 470 x 10 x 18.5 mm |
| Tooth form | 20 degree pressure angle, 18.5 mm pitch height |
| Straightness | 0.006 in (0.15 mm) full length |
| End fixings | 10-32 UNF 2B, Ø.362 in csk holes |
| Inspection | Tooth profile snap gauge, gantry CMM on pitch and straightness, UNF plug gauges |
| Tolerance | ±0.005 mm standard on metals, engineering plastics, and carbon fiber composite |
| Certifications | ISO 9001:2015, ISO 13485:2016, AS9100D |
| Capacity | 100+ CNC machines including 11 five-axis centers |
| MOQ | No MOQ; 1-piece prototypes supported |
| Quote | Within 24 hours for complete 2D/3D files |
About This Part
Nylon racks are quiet, self lubricating, and forgiving on mating gears, which is why medical mechanisms like them. They are also four hundred and seventy millimeters of material that wants to bend. This rack is roughed and finished in staged passes on vacuum fixturing with cold air cooling, holding full length straightness within 0.006 in, 0.15 mm.
The tooth form is a 20 degree pressure angle involute profile form milled along the full 18.5 mm pitch height, with cumulative pitch error checked gauge to gauge along the travel. Tooth faces finish at 32 RA, Ra 0.8 um, with the sharp plastic tools and cold air keeping fuzz and smearing off the flanks.
Both ends carry 10-32 UNF 2B threads and Ø.362 in countersunk fixing holes for rail mounting. Inspection pairs a dedicated tooth profile snap gauge with the gantry CMM over the full length, plus UNF plug gauges on the threads.
This part family supports the Medical Device Parts industry. Read how KGL machines parts for that sector, then send your drawing for a quote.
Why Machine It at KGL
Five-Axis Fleet
100+ CNC machines including 11 five-axis centers run complex geometry in single setups, so tolerances do not stack up across refixturing.
Verified Accuracy
±0.005 mm standard on metals, plastics, and carbon fiber composite, verified on Hexagon and Zeiss CMMs (0.0015 mm accuracy).
Fast Prototypes
Engineering feedback with every quotation; prototype parts typically machined in 15 to 25 days.
One Supplier, End to End
Material sourcing, machining, heat treatment coordination, finishing, CMM inspection and export packaging under one roof.
Part-Specific Advantages
- 20 degree pressure angle involute teeth, 18.5 mm pitch line
- Full length straightness 0.006 in (0.15 mm) over nearly 470 mm
- Tooth faces Ra 0.8 (32 RA), no fuzz or smearing
- 10-32 UNF 2B threads and countersunk holes on both ends
- PA66 nylon, cleaned and stress relieved after machining
Typical Applications
- Motion transfer racks in medical and laboratory mechanisms
- Low noise linear drives for instrument slides
- Polymer racks mating with pinions in automation
Commercial Terms
| Commercial | Detail |
|---|---|
| MOQ | No MOQ; 1-piece prototype supported |
| Quote | Within 24 hours for complete 2D/3D files |
| Terms | EXW / FOB Shenzhen |
| Certifications | ISO 9001:2015, ISO 13485:2016 |
| Packaging | Individual bubble wrap, export carton or wooden case |
| Lead Time | Prototypes 7 to 15 days; production scheduled by volume |
Common Questions
Why nylon for a rack?
It runs quiet, needs no grease near product or samples, and is gentle on the mating pinion. The trade is stiffness and thermal growth, so the mounting design keeps the span supported.
How do you keep 470 mm of nylon straight?
Low force cutters, cold air instead of flood coolant, staged passes on vacuum fixturing, and stress relief before the final tooth passes. Fighting the material after it moves never works.
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Send your 2D/3D drawings and get a quote within 24 hours. No MOQ for prototypes and small lots.
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