---
title: "Pen Needles 31g 5mm — $186K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/pen-needles-31g-5mm"
last_updated: "2026-08-11T22:13:21.556Z"
locale: en
meta:
description: "Niche score 55/100 · $186K/yr market · 67K searches/yr · $17.64 avg price. Strong incumbent ratings (4.7★) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 55/100 · $186K/yr market · 67K searches/yr · $17.64 avg price. Strong incumbent ratings (4.7★) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Pen Needles 31g 5mm — $186K/yr Amazon US Niche (2026) - Flapen"
---
# **pen needles 31g 5mm**
**Worth a look**
Shows low returns (0.1%), but strong incumbent ratings (4.7★) keeps it on the watch list.
Market size 37Growth 33Conversion 97Competition 46Returns 99Price range 83Avg price 82Brand share 48Review moat 64Quality gap 21
**Returns**
**Incredible****0.1%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****15.7%**
search→purchase rate — share of searches ending in a sale
**Price range**
**Great****$8.60–$50.25**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Great****$17.64**
avg listing price — sweet spot $15–$100
**Review moat**
**Good****946**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Okay****76%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****57%**
top-5 click share — leaders hold, buyers still browse
**Market size**
**Okay****$186K**
$186K/yr · 67K searches
**Growth**
**Okay****+6.2%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Signals**[** Out of Stock**](https://flapen.com/research/niches?market=us&signal=out_of_stock "OOS rate > 10%")
According to Flapen's Amazon United States niche tracking, pen needles 31g 5mm is a $186K/yr Amazon United States market (67K searches/yr). The top 5 brands hold 76% of demand. Demand peaks in May. Verdict: Worth a look — 55/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **pen needles 31g 5mm market data**
- **Units sold / yr**
- **10K–13K**
- avg 250–500/product
- **Revenue / yr**
- **$176K–$221K**
- units × avg price
- **Conversion rate**
- **15.7%**
- **Avg BSR**
- **#447**
- **Page quality**
- **0%**
- **Prime**
- **90%**
- **Sponsored**
- **62%**
- **Out of stock**
- **13.0%**
- **Avg brand age**
- **58 months**
- **Avg seller age**
- **187 days**
## **Competition & brand share**
The top 5 products take 57% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**12 **▲rising
**Sellers**
**16**
**Top-5 brand share**
**76%**
Top 20: 97%
**Top-5 click share**
**57%**
Top 20: 100%
**Open market**
**18%**
- Medt35% - GLUCO-CARE16% - Sensifine10% - Pro Comfort9% - Pharmacy Choice7% - Aicare5%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +6.2% search growth over the last 90 days.
2K1KHoliday '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: May · busiest ÷ quietest = 1.7×
[**Open Trend **](https://flapen.com/research/us/health-household/pen-needles-31g-5mm/trend)
## **Top pen needles 31g 5mm search terms**
- **pen needles 31g 5mm**27K/yr+6.5%13.9% conv. - **insulin pen needles 31g 5mm**11K/yr+6.2%11.1% conv. - **31g 5mm pen needles**5K/yr+79.5%13.9% conv. - **ultra fine pen needles 31g 5mm**4K/yr+1.5%13.0% conv. - **needles for insulin pens 5mm**3K/yr+25.8%9.5% conv. - **embecta pen needles 31g 5mm**4K/yr-16.7%8.2% conv. - **5mm pen needles**3K/yr+20.8%12.3% conv. - **bd ultra fine mini pen needles 5mm x 31g**8K/yr-50.2%9.6% conv. - **bd uf mini pen needle 5mmx31g**2K/yr-23.8%5.0% conv. [**All search terms **](https://flapen.com/research/us/health-household/pen-needles-31g-5mm/search-terms)
## **Top pen needles 31g 5mm products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%$19K20%$37K30%$56K40%$75K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted
All 21 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Medt Fine Insulin Pen Needles 31G 5mm - Ultra-Fine Diabetic Pen Needles Designed for Comfort Universal Fit for Most Pen-Style Devices Sterile Single-Use Pen Tips 100 Count (Pack of 1)**Medt**$8.61**4.8★5,065 rev](https://www.amazon.com/dp/B0DJ9T6C92) [2**GLUCO-CARE Pen Tips 31G x 5mm Universal Fit and Twist-On Design Thin Wall Compatible with Most Pen Devices 100 Pieces per Box**GLUCO-CARE**$10.30**4.7★292 rev](https://www.amazon.com/dp/B0DL51WSYJ) [3**31G 5mm Pen Tips Universal Fit Easy to Use 100CT Comfortable Design**Pro Comfort**$12.23**4.6★46 rev](https://www.amazon.com/dp/B0GYD7FJFJ) [4**Sensifine Pen Tips 31G x 5mm Box of 100 Universal Compatibility with most Pen Devices**Sensifine**$16.00**4.9★45 rev](https://www.amazon.com/dp/B0GH7CVPPD) [5**Medt - Fine Insulin Pen Needles (31G 5mm) - Diabetic Needles for Insulin Injections Ultra Fine Compatible with Most Diabetes Pens - 100 Ct Pack of 2**Medt**$15.96**4.8★5,065 rev](https://www.amazon.com/dp/B07HB7N8ZJ)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**31G 5mm Pen Tips Universal Fit Easy to Use 100CT Comfortable Design**Pro Comfort**$12.23**46 rev2mo ago](https://www.amazon.com/dp/B0GYD7FJFJ) [**Pen Tips 31Gx5mm Box of 200 Count Universal Design Extra Thin Single-Use**Suqaoae**$26.47**13 rev2mo ago](https://www.amazon.com/dp/B0GXK81LLQ) [**BD Ultra-Fine Mini Pen Tips 31G x 5mm 90 Count**Generic**$50.25**0 rev3mo ago](https://www.amazon.com/dp/B0H2BVMFZB) [**31G x 5mm(3/16) Pen Tips Universal Fit SterileUltra-Thin Wall Technology. Comfortable and Precise100 Count**Pharmacy Choice**$10.07**25 rev4mo ago](https://www.amazon.com/dp/B0GRV6KVZD) [**Pen Tips 31G x 4mm(5/32) Universal Fit SterileUltra-Thin Wall Technology. Comfortable and Precise100 Count**Pharmacy Choice**$10.41**31 rev4mo ago](https://www.amazon.com/dp/B0GR4YXQVR)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Pen Tips 31Gx5mm Box of 200 Count Universal Design Extra Thin Single-Use**Suqaoae**$26.47**4.8★**▲ 132%**](https://www.amazon.com/dp/B0GXK81LLQ) [**31G 5mm Pen Tips Universal Fit Easy to Use 100CT Comfortable Design**Pro Comfort**$12.23**4.6★**▲ 132%**](https://www.amazon.com/dp/B0GYD7FJFJ) [**31G x 5mm(3/16) Pen Tips Universal Fit SterileUltra-Thin Wall Technology. Comfortable and Precise100 Count**Pharmacy Choice**$10.07**4.8★**▲ 131%**](https://www.amazon.com/dp/B0GRV6KVZD) [**Pen Tips 31G x 4mm(5/32) Universal Fit SterileUltra-Thin Wall Technology. Comfortable and Precise100 Count**Pharmacy Choice**$10.41**4.6★**▲ 131%**](https://www.amazon.com/dp/B0GR4YXQVR) [**Sensifine Pen Tips 31G x 5mm Box of 100 Universal Compatibility with most Pen Devices**Sensifine**$16.00**4.9★**▲ 131%**](https://www.amazon.com/dp/B0GH7CVPPD)
**~~View all trending →~~**
## **What buyers say about pen needles 31g 5mm**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Value For Money**23%
*“Great deal”*
**Quality-Overall**15%
*“Overall build quality is consistent”*
**Ease Of Use**11%
*“easy to open”*
**Size-Overall**11%
*“fit securely”*
**Advertised Vs Actual Product**7%
*“Item as described”*
**Comfort-Overall**5%
*“Extremely comfortable”*
**Compatibility-Overall**3%
*“Designed with universal fit compatibility”*
**Sharpness**3%
*“Great pen tips-sharp”*
**Efficiency**3%
*“performed well in everyday use”*
**Leak-Proof**2%
*“doesnt leak out”*
### **What buyers complain about **
**Size-Overall**12%
*“But got the wrong size”*
**Pain Relief-Overall**6%
*“There is more discomfort initially”*
**Thickness**5%
*“They are super thin”*
**Comfort-Overall**3%
*“Lower quality needles can be quite uncomfortable”*
**Value For Money**3%
*“much cheaper”*
**Quality-Overall**3%
*“they didn't have enough quality control to identify”*
**Jamming/Clogging**3%
*“Some are clogged up & don't work”*
**Functionality-Overall**3%
*“do not work”*
**Ease Of Use**2%
*“it takes a little more effort and time”*
**Blood Sugar Level**2%
*“In fact I can barely even feel it when I'm administering my insulin”*
### **Top return reasons **
**Size-Overall**42%
**Compatibility-Overall**18%
**Advertised Vs Actual Product**10%
**Functionality-Overall**8%
**Design-Overall**2%
**Safety Standards**2%
**Comfort-Overall**2%
**Leak-Proof**2%
**Shape/Style**1%
**Quality-Overall**1%
## **Common questions**
- **Is pen needles 31g 5mm profitable to sell on Amazon United States?**
- The niche generates $186K/yr across 21 tracked products. 6 of 11 products launched in the last 360 days are still selling. 90-day search growth is +6.2%. Flapen's verdict: Worth a look (55/100).
- **How competitive is the pen needles 31g 5mm niche?**
- 12 brands and 16 sellers compete. The top 5 products take 57% of clicks and top 5 brands hold 76% of demand.
- **What do buyers complain about in pen needles 31g 5mm?**
- Top complaints mined from reviews: Size-Overall, Pain Relief-Overall, Thickness. The return rate is 0.1%.
- **When does demand for pen needles 31g 5mm peak?**
- Demand peaks in May; the busiest month runs 1.7× the quietest.
- **What does it cost to enter the pen needles 31g 5mm niche?**
- Listings span $8.60–$50.25; the average listing price is $17.64 (sweet spot $15–$100). The average incumbent carries 946 reviews — the moat a new listing must climb.
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