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庫存編號 394-273
BrandRS PRO
HK$483.04
單位
Straight 7 → 7.75mm 90 mm HSS
RS庫存編號 394-245
BrandRS PRO
HK$552.65
單位
Straight 7.75 → 8.5mm 100 mm HSS
RS庫存編號 698-124
製造零件編號B101 8MM
BrandDormer
HK$309.57
單位
Morse Taper 8mm 138 mm HSS
RS庫存編號 224-4460
製造零件編號B901 4.0MM
BrandDormer
HK$222.64
單位
Straight 4mm 76 mm HSS
RS庫存編號 698-152
製造零件編號B101 12MM
BrandDormer
HK$349.54
單位
Morse Taper 12mm 156 mm HSS
RS庫存編號 698-146
製造零件編號B101 10MM
BrandDormer
HK$317.80
單位
Morse Taper 10mm 146 mm HSS
RS庫存編號 394-295
BrandRS PRO
HK$793.61
單位
Straight 15.25 → 17mm 165 mm HSS
RS庫存編號 698-219
製造零件編號B101 20MM
BrandDormer
HK$685.18
單位
Morse Taper 20mm 200 mm HSS
RS庫存編號 224-4498
製造零件編號B901 8.0MM
BrandDormer
HK$306.02
單位
Straight 8mm 115 mm HSS
RS庫存編號 394-251
BrandRS PRO
HK$623.26
單位
Straight 9.25 → 10mm 115 mm HSS
RS庫存編號 224-4448
製造零件編號B901 2.0MM
BrandDormer
HK$360.82
單位
Straight 2mm 50 mm HSS
RS庫存編號 698-023
製造零件編號B101 1/2
BrandDormer
HK$348.69
單位
Morse Taper 1/2in 156 mm HSS
RS庫存編號 698-203
製造零件編號B101 19MM
BrandDormer
HK$678.28
單位
Morse Taper 19mm 193 mm HSS
RS庫存編號 188-2507
BrandRS PRO
HK$350.29
單位
Morse Taper 3/8in 127 mm HSS
RS庫存編號 188-2505
BrandRS PRO
HK$615.99
單位
Morse Taper 22mm 184 mm HSS
RS庫存編號 394-267
BrandRS PRO
HK$623.26
單位
Straight 10 → 10.75mm 125 mm HSS
RS庫存編號 698-051
製造零件編號B101 3/4
BrandDormer
HK$605.63
單位
Morse Taper 3/4in 200 mm HSS
RS庫存編號 394-291
BrandRS PRO
HK$900.35
單位
Straight 17 → 19mm 170 mm HSS
RS庫存編號 188-2508
BrandRS PRO
HK$384.84
單位
Morse Taper 1/2in 5-15/16 in HSS
RS庫存編號 698-174
製造零件編號B101 14MM
BrandDormer
HK$382.90
單位
Morse Taper 14mm 161 mm HSS