ACH-M9
Metric to Inch End Mill Ultra Precision Extension Holder, Inch Shank
Metric Accuhold Extension Holder 9mm ID, 0.750in Shank, 4.50in OAL, 5/16-24 Screw
Accuhold ultra-precision end mill extension holders — +.00015"/-0 hole tolerance to eliminate runout and tool breakage.
- Hole diameter tolerance +.00015"/-.00000 — the tightest-tolerance end mill extension, made to eliminate runout (TIR) and reduce tool breakage
- Reaches into deep parts: standard lengths 2-1/8" to 6-1/2" including -L long versions (ACH-04-L, ACH-06-L, ACH-08-L, ACH-12-L, ACH-16-32-L)
- Inch ACH line holds 3/32" to 1" tool shanks on 3/8" to 1-1/4" holder shanks
- ACH-M metric-to-inch line holds 3mm to 25mm tool shanks on inch holder shanks — converts an inch tool holder to metric tooling
- MAH all-metric line: 3-12mm holes on 10-25mm shanks, 82.5-150mm OAL
- Set screw sizes from 5-40 up to 7/16-20 matched to each holder
- Large sizes use stepped heads: ACH-16/M12 have a 1" dia x 1.5" head; ACH-24/32 and ACH-M18/M25 have 1-1/4" dia x 2-1/4" heads with 2" hole depth
- Shank tolerance -.0001/-.0003, OAL +/-.060
From the RobbJack Applications Guide.
About this series
ACH-M Metric-to-Inch End Mill Ultra Precision Extension Holders
Convert your inch tool holder to hold metric shanks
The ACH-M is a metric end mill extension holder with an inch shank. Use this precision end mill extension holder to convert your inch tool holder to be able to hold onto metric shanks. It is the tightest tolerance end mill extension, used to reach into parts that need longer length; precision end mills need precision holders to eliminate runout (TIR) and reduce tool breakage. Metric hole sizes range from 3 mm to 25 mm with inch shanks.
- Metric end mill extension holder with inch shank
- Converts an inch tool holder to hold metric shanks
- Tightest tolerance end mill extension
- Eliminates runout (TIR) and reduces tool breakage
- Hole Dia. tolerance +.004/-.000 mm
- Shank Dia. tolerance +.000/-.007 mm
- OAL tolerance +/-1.5 mm
Converts inch tool holders to metric shanks; ACH-M12 has a 1" diameter x 1.5" long head, and ACH-M18 and ACH-M25 have a 1-1/4" diameter x 2-1/4" long head with a hole depth of only 2" deep
Headline spec
Metric hole diameters 3 mm-25 mm; inch shanks 3/8" to 1-1/4"; 3-1/4" to 6-1/2" OAL
Best for
- Converting an inch tool holder to hold metric-shank end mills
- Reaching into parts that need longer length
Specifications
US machining terms with ISO 13399 codes.
- Holder DiameterDMM
- 0.752″
- Accessory Type
- Extension Holder
- Overall Length (OAL)OAL
- 4.5″
- Series
- ACH-M — Metric to Inch End Mill Ultra Precision Extension Holder, Inch Shank
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Tolerances
| Type | Min | Max |
|---|---|---|
| Hole Diameter | 0 | +0.00015 |
| Overall Length | -0.06 | +0.06 |
| Shank Diameter | -0.0001 | -0.0003 |
Made & shipped in the USA · lead time confirmed at order. Buy at retail or through your distributor.
Performance guaranteed. Run it against the tool you use today — if it doesn't beat it, we'll make it right.
Adds Uncoated · $402.30 — our pick for your material. Choose another finish below.
Proven in the field
- $548,290saved per year drilling carbon-fiber aircraft
- $216,000saved per year trimming aircraft skins
- 1,000%metal-removal increase in Inconel 718 (SPS)
Finishes (1)
Uncoated
ACH-M9
$402.30
Available to order
Starting at
$402.30
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More in the ACH-M series
Same series, different size — what changes from this tool is shown in red.