Reamer Bits

When completing high-performance projects that require the forming of precise holes in or through materials, the sides of the hole may require additional work to ensure they are completely smooth. In this case, reamers are designed to completely smooth the hole to a high degree of accuracy.


Due to the removal of the uneven material, reaming will slightly enlarge the hole you have created, therefore making it advisable to form the initial hole fractionally smaller to allow for the reaming space – this is called the allowance. It is recommended that the drilled hole should not be enlarged by more than 5% of the drilled diameter.


Typically made from carbide or high-speed steel (HSS), these multi-edged rotary cutting tools are used in metalworking for enlarging and finishing holes to a high level of precision and accuracy.


What types of reamer are there?


At RS Components, we have both machine reamer bits and hand reamer bits. The main difference between the two is that hand reamer bits have a longer taper or lead in at the front end of the bit, which compensates for the difficulty of using hand power alone.


Straight reamer bits are used to make only minor enlargements to holes, typically ones used for the force-fitting of location dowel pins or for unthreaded shoulder bolts.


With helical/spiralled reamer bits, a clockwise reamer will pull any debris up and out of a blind hole, whereas an anti-clockwise reamer will push debris forward, which can be helpful when creating a through-hole.


A tapered reamer is used to make a tapered hole for a tapered pin, which is a self-tightening device due to the shallow angle of the taper. They are commonly used in aircraft assembly and may only be re-reamed a small number of times during an aircraft’s career.


Combination reamers have two or more cutting surfaces, cut to resemble the part’s multiple internal diameters. Using combination reamers reduces the number of separate operations as well as precisely creating relative depths and diameters.


Adjustable reamers consist of several blades along a tapered groove that can be adjusted to cover a small range of hole sizes. They are restricted to light usage due to the absence of any spiral in the flute, meaning they will only remove minimal material for each diameter setting, and cannot be used in holes that have an axial split.


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Description Price Shank Type Diameter Overall Length Material
RS Stock No. 394-279
BrandRS PRO
TWD2,819.00
Each
units
Straight 11.75 → 12.75mm 130 mm HSS
RS Stock No. 698-023
Mfr. Part No.B101 1/2
BrandDormer
TWD1,399.00
Each
units
Morse Taper 1/2in 156 mm HSS
RS Stock No. 698-051
Mfr. Part No.B101 3/4
BrandDormer
TWD2,429.00
Each
units
Morse Taper 3/4in 200 mm HSS
RS Stock No. 394-295
BrandRS PRO
TWD3,331.00
Each
units
Straight 15.25 → 17mm 165 mm HSS
RS Stock No. 698-102
Mfr. Part No.B101 6MM
BrandDormer
TWD1,194.00
Each
units
Morse Taper 6mm 125 mm HSS
RS Stock No. 698-219
Mfr. Part No.B101 20MM
BrandDormer
TWD2,866.00
Each
units
Morse Taper 20mm 200 mm HSS
RS Stock No. 394-239
BrandRS PRO
TWD6,021.00
Each
units
Straight 21 → 23mm 85.72 mm HSS
RS Stock No. 394-302
BrandRS PRO
TWD4,431.00
Each
units
Straight 19 → 21mm 180 mm HSS
RS Stock No. 188-2503
BrandRS PRO
TWD1,764.00
Each
units
Morse Taper 14mm 152 mm HSS
RS Stock No. 394-289
BrandRS PRO
TWD3,119.00
Each
units
Straight 12.75 → 13.75mm 145 mm HSS
RS Stock No. 394-245
BrandRS PRO
TWD2,406.00
Each
units
Straight 7.75 → 8.5mm 100 mm HSS
RS Stock No. 188-2506
BrandRS PRO
TWD2,718.00
Each
units
Morse Taper 26mm 184 mm HSS
RS Stock No. 394-273
BrandRS PRO
TWD2,005.00
Each
units
Straight 7 → 7.75mm 90 mm HSS
RS Stock No. 698-174
Mfr. Part No.B101 14MM
BrandDormer
TWD1,650.00
Each
units
Morse Taper 14mm 161 mm HSS
RS Stock No. 224-4476
Mfr. Part No.B901 5.0MM
BrandDormer
TWD926.00
Each
units
Straight 5mm 87 mm HSS
RS Stock No. 394-241
BrandRS PRO
TWD2,516.00
Each
units
Straight 8.5 → 9.25mm 105 mm HSS
RS Stock No. 394-267
BrandRS PRO
TWD2,743.00
Each
units
Straight 10 → 10.75mm 125 mm HSS
RS Stock No. 224-4482
Mfr. Part No.B901 6.0MM
BrandDormer
TWD1,094.00
Each
units
Straight 6mm 93 mm HSS
RS Stock No. 698-152
Mfr. Part No.B101 12MM
BrandDormer
TWD1,476.00
Each
units
Morse Taper 12mm 156 mm HSS
RS Stock No. 394-263
BrandRS PRO
TWD1,982.00
Each
units
Straight 6.5 → 7mm 85 mm HSS