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Adjustable reamer 11-12 mm NRZe
15022
€22.66 tax inc.
Net price: €18.42
Description
Adjustable reamer 11-12 mm – reamer adjustable to 12 mm
Technical data – HSS blades, shank with square drive for a tap wrench
| Technical data | |
|---|---|
| Adjustment range | 11–12 mm |
| Designation | NRZe to PN |
| Blades | HSS, in inclined grooves |
| Diameter adjustment | two nuts |
| Shank diameter | 6.0 mm |
| Shank square | 5 mm |
| Overall length | 135 mm |
| Blade length | 43 mm |
| Drive | tap wrench |
Adjustable reamer 11-12 mm The NRZe finishes holes from 11 to 12 mm, including the full 12 mm size. Set the diameter with two nuts that move the high-speed steel (HSS) blades along inclined grooves. Straight shank drill bits to DIN 338 are available in 0.1 mm increments, for example 10.9, 11.4, and 11.9 mm. This allows you to select a drill bit for single-pass reaming at any diameter within the range. Operate it by hand with a tap wrench fitted over the square on the shank.
Manufacturers design adjustable blade reamers for repair and assembly work. They are useful wherever a hole needs to be fitted to the part at hand. The diameter is then set to the size of the part, rather than to the standard size series of fixed reamers.
Which size to choose: 11-12 or 10.5-12 mm
The 11–12 mm range falls entirely within the range of the 10.5-12 mm reamer. Choose the latter if you also need holes from 10.5 to 11 mm. The 10.25-11 mm reamer covers holes from 10.25 to 10.5 mm, and the 12-13.5 mm reamer covers holes larger than 12 mm. The 11-12 mm reamer has a 5 mm square and is 135 mm long, while the 10.5-12 mm reamer has a 4.8 mm square and is 140 mm long. Both can be driven with the same No. 1 tap wrench.
How diameter adjustment works – blades and two nuts
NRZe reamer construction and measuring the diameter setting
The body has inclined grooves around its circumference, each holding an HSS blade. Two nuts, front and rear, retain the blades at both ends. Moving the blades along the grooves moves their cutting edges away from or toward the axis. This changes the cutting diameter over a range of 1 mm, from 11 to 12 mm. This is why the tool is also called an adjustable reamer.
Adjustment in three steps
First, loosen one nut. Then tighten the other — the blades will move to the new diameter. Finally, lock the blades by tightening the first nut. The rear nut, on the shank side, provides the main clamping force; the front nut is only snugged up. Tighten carefully. Excessive force bows the blades outward and causes the reamer to catch in the hole.
How to measure the set diameter
With an even number of blades, measure the diameter across two opposite blades using a micrometer. With an odd number, a groove lies opposite each blade, so the micrometer will read too low. In this case, use a setting ring or a hole of known diameter. Insert the reamer and expand the blades until they contact the hole wall.
How to ream step by step – tap wrench and clockwise rotation
Guidelines for using an adjustable hand reamer
Insert the reamer into the hole and apply light pressure so the blades engage the wall immediately. The tap wrench must fit the square closely to ensure smooth rotation without jerking. Align the reamer axis with the hole axis. For a longer hole, check the alignment with a square.
Hand reaming in six steps
1
Drill a hole
0.05–0.15 mm smaller than the finished hole, e.g., 11.4 mm for 11.5 mm.
2
Set the diameter
Loosen one nut, move the blades with the other, then lock the first nut.
3
Fit the tap wrench
Fit it to the square and align the reamer with the hole axis.
4
Turn clockwise
Turn smoothly with light, even pressure.
5
Withdraw the reamer
Keep turning clockwise, including as the blades leave the hole.
✓
Check the hole
Too tight? Set a larger diameter and make a second pass.
Guidelines based on adjustable reamer manufacturers' instructions.
As the blades emerge from the far end of the hole, resistance drops suddenly. Reduce pressure at this point, but maintain the same turning speed. Otherwise, the reamer will jump through the end of the hole and leave it uneven.
▲
Never turn counterclockwise
Turning counterclockwise in the hole dulls the blades and may chip them. It can also loosen a nut and change the setting. Turn clockwise when withdrawing the tool as well; otherwise, you will scratch the hole wall.
How much material one pass removes
Reaming allowance and drill bit selection
This tool finishes a hole rather than drilling it. It removes a thin layer: 0.05 to 0.15 mm on diameter in one pass. A smaller allowance produces a smoother hole wall. Too little allowance is detrimental because the blades rub against the wall instead of cutting and dull faster. The drawing shows a 11.5 mm hole after a 11.4 mm drill.
Calculation: 12 mm hole after drilling with a 11.9 mm drill bit
Allowance on diameter = finished hole diameter 12.0 mm − drill diameter 11.9 mm = 0.1 mm. Half of this, or 0.05 mm, is on each wall. This layer is thinner than a sheet of paper. A reamer set to 12.0 mm will remove it in one pass.
| Finished hole [mm] | Drill bit [mm] | Diametral allowance [mm] | Layer thickness at the wall [mm] | Passes |
|---|---|---|---|---|
| 11.0 | 10.9 | 0.1 | 0.05 | 1 |
| 11.5 | 11.4 | 0.1 | 0.05 | 1 |
| 12.0 | 11.9 | 0.1 | 0.05 | 1 |
| 12.0 | 11.8 | 0.2 | 0.1 | 2: set to 11.9, then 12.0 |
A 11.8 mm drill bit leaves a 0.2 mm allowance for a 12 mm hole. Remove it in two passes: set the first to 11.9 mm and the second to 12.0 mm. Two passes, preliminary and finishing, also produce the smoothest bore surface. However, each must remove at least 0.05 mm.
Tap wrench and lubrication – what to prepare
Tap wrench for a 5 mm square and oil suited to the material
Tap wrench No. 1
The shank square measures 5 mm, nearly the same as M5–M8 hand taps with a 4.9 mm square. The same tap wrench therefore fits. Choose an adjustable tap wrench to DIN 1814, size No. 1. It accepts squares from 2 to 6.3 mm and fits M1–M10 taps. The smaller No. 0 tap wrench has an upper limit of 5 mm, exactly at the size of the reamer square.
With oil or dry
| Workpiece material | Lubrication |
|---|---|
| Steel and cast steel | cutting oil or emulsion |
| Aluminum alloys | cutting oil or emulsion |
| Gray and malleable cast iron | dry |
| Bronze and brass | dry |
Remove chips from the reamer after use. Before adjusting the blades, also clean the body grooves so the blades move evenly.
Adjustable reamer 11-12 mm The NRZe range ends at the full 12 mm size. Drill bits in 0.1 mm increments allow any hole from 11 to 12 mm to be prepared for one pass. The blades then remove 0.05 to 0.15 mm on the diameter. Operate the reamer with a No. 1 tap wrench, the same one used for M5–M8 taps, always turning clockwise.
Questions about drill bits, size selection, and operation
Frequently asked questions about hand reaming
With a 11.9 mm straight shank drill bit to DIN 338. It leaves a 0.1 mm allowance on the diameter, so the reamer set to 12.0 mm removes it in one pass. After drilling with a 11.8 mm drill bit, ream twice: to 11.9 and 12.0 mm.
Both are suitable for holes from 11 to 12 mm. The 10.5-12 mm reamer additionally covers holes from 10.5 to 11 mm. The 11-12 mm reamer has a 5 mm square, while the 10.5-12 mm model has a 4.8 mm square, and both use a No. 1 tap wrench.
Clockwise, just as when reaming. Clockwise rotation protects the blades and the hole wall. It also keeps the nuts in place, so the setting does not change.
Yes, at very low speed and with plenty of oil. At high speed, the hole may end up larger than the setting. Using a tap wrench provides the best control.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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