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Adjustable reamer 56-70 mm NRZe
498253
€155.37 tax inc.
Net price: €126.32
Description
Adjustable reamer 56-70 mm – adjustable, 33 mm square
Technical data – HSS blades, shank with square drive for a tap wrench
| Technical data | |
|---|---|
| Adjustment range | 56–70 mm |
| Designation | NRZe to PN |
| Blades | HSS, in inclined grooves |
| Diameter adjustment | two nuts |
| Shank diameter | 40.5 mm |
| Shank square | 33 mm |
| Overall length | 460 mm |
| Blade length | 130 mm |
| Drive | tap wrench |
Adjustable reamer 56-70 mm NRZe finishes holes from 56 to 70 mm. Set the diameter with two nuts that move the high-speed steel (HSS) blades in the inclined slots in the body. The adjustment range is 14 mm, and the shank square measures 33 mm – 1 mm more than the No. 7 tap wrench can accept. Drills in this range are available in 1 mm increments, so bore the initial hole. Operate it by hand with a tap wrench fitted to 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: 56-70 or 64-74 mm
Both reamers cover holes from 64 to 70 mm. The 64-74 mm reamer extends to 74 mm and has a 50 mm shank and a 39 mm square. This reamer has a 40.5 mm shank, an 33 mm square, and a length of 460 mm versus 400 mm. Use the 46-56 mm reamer below 56 mm.
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 14 mm, from 56 to 70 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
Prepare the hole
0.05–0.15 mm smaller than the finished hole, e.g., 62.9 mm for 63.0 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 initial hole
This tool finishes a hole rather than drilling it. It removes a thin layer: from 0.05 to 0.15 mm on the diameter in one pass. A smaller allowance produces a smoother wall. Too little allowance is detrimental, as the blades rub against the wall instead of cutting and become dull faster.
Calculation: 63 mm hole from a 62.9 mm initial hole
Allowance on diameter = finished hole diameter 63.0 mm − initial hole diameter 62.9 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 63.0 mm will remove it in one pass.
| Finished hole [mm] | Initial hole [mm] | Diametral allowance [mm] | Layer thickness at the wall [mm] | Passes |
|---|---|---|---|---|
| 56.0 | 55.9 | 0.1 | 0.05 | 1 |
| 63.0 | 62.9 | 0.1 | 0.05 | 1 |
| 63.0 | 62.8 | 0.2 | 0.1 | 2: set to 62.9, then 63.0 |
| 70.0 | 69.9 | 0.1 | 0.05 | 1 |
The 62 mm drill in the range would leave a 1.0 mm allowance for a 63 mm hole, or 0.5 mm per wall. This is approximately 6.7 times the amount the blades remove in one pass. Remove this amount beforehand by boring the hole. Remove a larger allowance from the initial hole, e.g., 0.2 mm, in two passes: to 62.9 and 63.0 mm.
Tap wrench and lubrication – what to prepare
Tap wrench for a 33 mm square and oil suited to the material
Tap wrench No. 8
The shank square measures 33 mm. Select an adjustable tap wrench to DIN 1814, size No. 8. It accommodates squares from 16 to 40 mm and fits M25–M68 taps.
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 56-70 mm NRZe has a 33 mm square that fits a No. 8 tap wrench, designed for squares from 16 to 40 mm. The reamer is 460 mm long, with 130 mm blades. Bore the initial hole with an allowance of 0.05 to 0.15 mm on diameter. The 14 mm adjustment range covers holes from 56 to 70 mm. Always turn clockwise.
Questions about size selection, pilot holes, and operation
Frequently asked questions about hand reaming
A No. 8 adjustable tap wrench, which accepts squares from 16 to 40 mm. The No. 7 tap wrench has a maximum capacity of 32 mm. The No. 8 tap wrench also fits taps from M25 to M68.
Either can produce holes from 64 to 70 mm. The 56-70 mm reamer covers holes from 56 mm, while the 64-74 mm reamer covers holes up to 74 mm. They have different squares, 33 and 39 mm, but both fit a No. 8 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.
Product accessories
Metal drill bit 54 NWKc HSS DIN 345 Baildon
Reference: 0452 In stock > 10 items
€136.84
€168.32 brutto
Metal drill bit 64 NWKc HSS DIN 345 Baildon
Reference: 0461 In stock < 10 items
€226.32
€278.37 brutto
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Shipping
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| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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