Spark Plug Gap Tool Market Report: Sales Volume, Market Share, Leading Brands & Market Trends
Spark Plug Gap Tool sales on Amazon US totaled 26,900 units in July 2026 (▼ 5.4% vs. the prior month), generating an estimated $303,329 in revenue across the 50 top-ranked ASINs for this search term. Demand is heavily concentrated at the top of the ranking — the ten best performers capture 62.8% of unit volume and 53.8% of revenue, while a typical listing is priced at $12.76. The keyword itself pulled 32,198 Amazon queries over the same period (▼ 0.8% MoM).
Zooming out to the 12-month window ending July 2026, the spark plug gap tool Top 50 moved 275,050 units and $3,095,274 in cumulative sales — an average of 22,921 units and $257,939 per month. Monthly throughput topped out at 32,600 units in April 2026 and dipped to 16,600 in May 2026, leaving the latest reading 27.8% higher than August 2025.
Spark Plug Gap Tool Sales Trend (Trailing 12 Months)
Based on the top 50 ASINs by monthly sales for this keyword
2025/08
2025/09
2025/10
2025/11
2025/12
2026/01
2026/02
2026/03
2026/04
2026/05
2026/06
2026/07
Monthly Sales 2026/07
26.9K
▼ 5.4% MoM
Monthly Revenue 2026/07
$303.3K
▼ 4.3% MoM
Top 10 Market Share 2026/07
62.8%
Spark Plug Gap Tool Market Share & Sales Concentration on Amazon US — July 2026
The most-sold spark plug gap tool listing on Amazon US in July 2026 is ASIN B0FJR8M3ZV (Brand: Hoiny), which sold 4,000 units at $6.99 apiece — equal to 14.9% of every unit tracked in this report and 33% ahead of the No. 2 listing.
The Top 10 ASINs account for 16,900 units and $163,201 in July 2026 — 62.8% of unit volume and 53.8% of revenue among all 50 ranked ASINs in this report.
Sales Volume of Top ASINs for 'Spark Plug Gap Tool' on Amazon
July 2026
Is 62.8% Top 10 share highly concentrated?
Ask AI to evaluate competition, market structure, and entry opportunities using ’s tracked Amazon sales, ranking, and keyword data.
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Top 5 Volume Share breakdown
B0FJR8M3ZV
Hoiny 2pcs Feeler Gauges Set Stainless Steel, Spark Plug Gap Tool | 32 Straight & 16 Angled Blades, Dual Marked SAE/Metric Wider Range, Filler Gauges Kit for Valves, Automotive, Piston, Guitar
4K
▲ 0.0%vs. prior month
$31K
latest month
12-month trend
B00144AZ6K
CTA Tools 3235 Spark Plug Gapper: Coin-Style Spark Plug Gap Tool, 0.020"–0.100" Measurement Range, Plated Steel, Quick-Check Reference Tool
3K
▲ 0.0%vs. prior month
$15K
latest month
12-month trend
B0CGRZKT71
Mutt Tools Feeler Gauge Set Metric and Inch for Valves, Spark Plug Gap Tool | Dual Gauge, Metric and SAE, 32 Blade, Stainless Steel, Valve Gap
3K
▲ 0.0%vs. prior month
$38.9K
latest month
12-month trend
B07B3TQQSV
Spurtar Feeler Gauges 0.001-0.04" (0.03-1.00mm) 32 Blades Tapered | Dual Marked SAE and Metric, For Spark Plug, Valve, Piston, Guitar, For Measuring Gap Thickness Width
1K
▲ 0.0%vs. prior month
$8.8K
latest month
12-month trend
B07MH5ZDMD
LEXIVON 5/8" Swivel Magnetic Spark Plug Socket, 3/8" Drive x 10" Total Length | Enhanced Magnetic Design with Thin Wall Socket, Cr-v Steel (LX-122)
1K
▲ 0.0%vs. prior month
$15K
latest month
12-month trend
B0FL2HPGYJ
Spark Plug Gap Tool with 32 Blade Steel Feeler Gauge, Spark Plug Gapping Tool for Most 10mm 12mm 14mm 16mm Thread Spark Plugs, Red
1K
▲ 0.0%vs. prior month
$17K
latest month
12-month trend
Unlock to view all Top 50 ASIN competitors and their sales contributions
Best Spark Plug Gap Tool Brands on Amazon US — Top 3 Brand Sales Concentration (July 2026)
Hoiny is the best-performing spark plug gap tool brand in July 2026, moving 4,000 units across 1 ASIN for 23.7% of Top 10 volume. CTA Tools follows with 3,000 units (17.8%), ahead of AMERICAN MUTT TOOLS on 3,000 units (17.8%).
Volume is spread across 10 brands, with the top three holding 59.2% between them. No single label controls the shelf, which usually leaves room for a well-differentiated listing to take share without outspending an incumbent. Average selling prices among the leaders run from $5.02 to $13.99, which frames the price band a competing listing has to justify.
Brand share of Top 10 volume
Hoiny
1 ASIN in Top 10
23.7%
Units
4K
Revenue
$31K
Avg. price
$6.99
B0FJR8M3ZV
$6.99·★4.7·660 revsHoiny 2pcs Feeler Gauges Set Stainless Steel, Spark Plug Gap Tool | 32 Straight & 16 Angled Blades, Dual Marked SAE/Metric Wider Range, Filler Gauges Kit for Valves, Automotive, Piston, Guitar
Units sold4K
CTA Tools
1 ASIN in Top 10
17.8%
Units
3K
Revenue
$15K
Avg. price
$5.02
B00144AZ6K
$5.02·★4.6·7.5K revsCTA Tools 3235 Spark Plug Gapper: Coin-Style Spark Plug Gap Tool, 0.020"–0.100" Measurement Range, Plated Steel, Quick-Check Reference Tool
Units sold3K
AMERICAN MUTT TOOLS
1 ASIN in Top 10
17.8%
Units
3K
Revenue
$38.9K
Avg. price
$13.99
B0CGRZKT71
$13.99·★4.7·1.7K revsMutt Tools Feeler Gauge Set Metric and Inch for Valves, Spark Plug Gap Tool | Dual Gauge, Metric and SAE, 32 Blade, Stainless Steel, Valve Gap
Units sold3K
Trending Spark Plug Gap Tool Products — Growth Leaders & New Top 10 Entrants
Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, one ASIN forced its way in: B0D78S2L7Q booked 1K units at $6.94, with ▲ 11.1% MoM change. On the growth side, B0GDR91X62 leads positive momentum with ▲ 300.0% MoM growth on 400 units, with B0FWBVKJJP close behind at ▲ 300.0% MoM on 200 units.
The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.
B0D78S2L7Q
Spark Plug Socket Wrench T-Handle 5/8" (16mm) & 13/16" (21mm) | Remover Installer Tool, For Motorcycles, For Lawn Mowers, For Small Motor Vehicles
Price
$6.94
Rating
4.4
Reviews
420
Latest month sales
B0GDR91X62
Feeler Gauges Set, 2pcs Stainless Steel 32 Straight & 16 Angled Blades | Dual Marked SAE/Metric, Spark Plug Gap Tool for Valves, Automotive, Piston, Guitar
Price
$5.99
Rating
4.5
Reviews
59
Latest month sales
B0FWBVKJJP
Spark Plug Gap Tool with 32 Blade Steel Feeler Gauge, Spark Plug Gapping Tool for Most 10mm 12mm 14mm 16mm Thread Spark Plugs, Blue
Unlock to view ASIN details and product titles
Price
$16.99
Rating
4.6
Reviews
248
Latest month sales
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