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. 188-2505
BrandRS PRO
SGD107.39
Each
units
Morse Taper 22mm 184 mm HSS
RS Stock No. 188-2501
BrandRS PRO
SGD63.84
Each
units
Morse Taper 10mm 127 mm HSS
RS Stock No. 394-267
BrandRS PRO
SGD116.23
Each
units
Straight 10 → 10.75mm 125 mm HSS
RS Stock No. 698-152
Mfr. Part No.B101 12MM
BrandDormer
SGD60.94
Each
units
Morse Taper 12mm 156 mm HSS
RS Stock No. 188-2508
BrandRS PRO
SGD70.13
Each
units
Morse Taper 1/2in 5-15/16 in HSS
RS Stock No. 698-219
Mfr. Part No.B101 20MM
BrandDormer
SGD119.45
Each
units
Morse Taper 20mm 200 mm HSS
RS Stock No. 394-279
BrandRS PRO
SGD124.90
Each
units
Straight 11.75 → 12.75mm 130 mm HSS
RS Stock No. 188-2504
BrandRS PRO
SGD86.81
Each
units
Morse Taper 16mm 167 mm HSS
RS Stock No. 224-4505
Mfr. Part No.B901 10.0MM
BrandDormer
SGD59.16
Each
units
Straight 10mm 133 mm HSS
RS Stock No. 394-263
BrandRS PRO
SGD87.83
Each
units
Straight 6.5 → 7mm 85 mm HSS
RS Stock No. 188-2507
BrandRS PRO
SGD63.84
Each
units
Morse Taper 3/8in 127 mm HSS
RS Stock No. 188-2502
BrandRS PRO
SGD70.13
Each
units
Morse Taper 12mm 152 mm HSS
RS Stock No. 394-241
BrandRS PRO
SGD106.55
Each
units
Straight 8.5 → 9.25mm 105 mm HSS
RS Stock No. 188-2509
BrandRS PRO
SGD115.83
Each
units
Morse Taper 1in 7-1/4 in HSS
RS Stock No. 188-2477
BrandRS PRO
SGD148.31
1 Set
Set(s)
Straight 14 mm, 18 mm, 22 mm 105 mm HSS
RS Stock No. 394-239
BrandRS PRO
SGD266.86
Each
units
Straight 21 → 23mm 85.72 mm HSS
RS Stock No. 698-023
Mfr. Part No.B101 1/2
BrandDormer
SGD62.00
Each
units
Morse Taper 1/2in 156 mm HSS
RS Stock No. 698-146
Mfr. Part No.B101 10MM
BrandDormer
SGD56.49
Each
units
Morse Taper 10mm 146 mm HSS
RS Stock No. 394-295
BrandRS PRO
SGD147.63
Each
units
Straight 15.25 → 17mm 165 mm HSS
RS Stock No. 698-124
Mfr. Part No.B101 8MM
BrandDormer
SGD55.05
Each
units
Morse Taper 8mm 138 mm HSS
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