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Product Specifications:
| Item | Chucking Reamer |
| Application | Through Hole |
| Coolant Fed | Non Coolant Through |
| Coolant Through | No |
| Cutting Dia. Tolerance | 0" to 0.0005" |
| Cutting Direction | Right Hand |
| Cutting Direction-machining | Right Hand |
| Decimal Equivalent | 0.4375 |
| Dimensions Type | Fractional Inch |
| Finish | Bright Uncoated |
| Flute Length | 3 27/64" |
| Flute Type | Straight |
| List Number | 257 |
| Material | Carbide |
| Material Application | Aluminum, Composite, Plastic, Thermoplastic |
| No. Of Flutes | 2 |
| Overall Length | 6" |
| Primary Material Application | Carbon Fiber |
| Primary Material Application Iso Code | O |
| Reamer Application | Through Hole |
| Reamer Size | 7/16" |
| Shank Dia. | 0.438" , 7/16" |
| Shank Type | Straight |
| Size-decimal | 7/16" |
| Spiral Direction | Neutral |
| System Of Measurement | Imperial |
Shipping Info:
| Ship weight (kg) | 0.14 |
| Ship height (cm) | 2.54 |
| Ship length (cm) | 15.24 |
| Ship width (cm) | 2.54 |
| Country of Origin | US |
Product Variants
| Product | Model | Shank Dia. | Primary Material Application Iso Code | Flute Length | Reamer Size | Size-decimal | Spiral Direction | Decimal Equivalent | List Number | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
![]() |
300-2280 | 0.219" | K, M, N, P | 1" | #1 | #1 | Neutral | 0.228 | 300D | €81.61 | |
![]() |
257-1935 | 3/16" | O | 1 29/32" | #10 | #10 | Neutral | 0.1935 | 257 | €163.48 | |
![]() |
300-1935 | 3/16" | K, M, N, P | 7/8" | #10 | #10 | Neutral | 0.1935 | 300D | €70.26 | |
![]() |
257-1910 | 3/16" | O | 1 7/8" | #11 | #11 | Neutral | 0.191 | 257 | €131.68 | |
![]() |
257-1916 | 3/16" | O | 1 7/8" | #11 | #11 | Neutral | 0.191 | 257 | €162.47 | |
![]() |
300-1910 | 3/16" | K, M, N, P | 7/8" | #11 | #11 | Neutral | 0.191 | 300D | €70.26 | |
![]() |
300-1890 | 0.172" | K, M, N, P | 7/8" | #12 | #12 | Neutral | 0.189 | 300D | €70.70 |
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OSG 257-4376 Chucking Reamer, 7/16 Inch Reamer Size, 3 27/64 Inch Flute Length, 6 Inch Overall Length
€413.58 /unit


