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Adjustable reamer 37.5-45 mm NRZe
13319
€199.07 tax inc.
Net price: €161.84
Description
Adjustable reamer 37.5-45 mm – reamer adjustable to 40 mm
Technical data – HSS blades, shank with square drive for a tap wrench
| Technical data | |
|---|---|
| Adjustment range | 37.5–45 mm |
| Designation | NRZe to PN |
| Blades | HSS, in inclined grooves |
| Diameter adjustment | two nuts |
| Shank diameter | 19.7 mm |
| Shank square | 15 mm |
| Overall length | 348 mm |
| Blade length | 125 mm |
| Drive | tap wrench |
Adjustable reamer 37.5-45 mm NRZe finishes holes from 37.5 to 45 mm. The diameter is set using two nuts that move the high-speed steel (HSS) blades along inclined grooves in the body. Up to 40.5 mm, drill bits in the range are available in 0.25 mm increments; above that, in 0.5 mm increments. Holes up to 40.5 mm are therefore reamed after drilling, while larger holes require a bored pilot hole. The tool is operated by hand using a tap wrench fitted to the shank square.
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 for 37–45 mm holes
Holes from 37 to 37.5 mm are covered by the 34-38.75 mm reamer. This reamer works from 37.5 to 45 mm. The 38.75-46 mm reamer has the same dimensions: 19.7 mm shank, 15 mm square, and 348 mm overall length. However, it starts at 38.75 mm and ends at 46 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 7.5 mm, from 37.5 to 45 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
Use a 39.75 mm drill bit for a 40.0 mm hole. Remove the 0.25 mm allowance in two passes.
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: 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: 40 mm hole after drilling with a 39.75 mm drill bit
Diametral allowance = finished hole diameter 40.0 mm − drill bit diameter 39.75 mm = 0.25 mm. This exceeds the 0.15 mm that the blades remove in one pass. Set the first pass to 39.9 mm – it will remove 0.15 mm. Set the second to 40.0 mm – it will remove the remaining 0.1 mm.
| Finished hole [mm] | Drill bit [mm] | Diametral allowance [mm] | Layer thickness at the wall [mm] | Passes |
|---|---|---|---|---|
| 38.0 | 37.75 | 0.25 | 0.125 | 2: set to 37.9, then 38.0 |
| 39.0 | 38.75 | 0.25 | 0.125 | 2: set to 38.9, then 39.0 |
| 40.0 | 39.75 | 0.25 | 0.125 | 2: set to 39.9, then 40.0 |
| 40.5 | 40.25 | 0.25 | 0.125 | 2: set to 40.4, then 40.5 |
Above 40.5 mm, drill bits in the range are available in 0.5 mm increments. A 41.5 mm drill bit leaves a 0.5 mm allowance for a 42 mm hole, more than three times the amount the blades remove in one pass. First bore such a hole to 41.9 mm, then ream it in one pass.
Tap wrench and lubrication – what to prepare
Tap wrench for a 15 mm square and oil suited to the material
Tap wrench No. 4
The shank square measures 15 mm. Select an adjustable tap wrench to DIN 1814, size No. 4. It accommodates squares from 5.5 to 16 mm and fits M9–M27 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 37.5-45 mm NRZe reams drilled holes up to 40.5 mm and bored holes above that size. The reamer is 348 mm long, with 125 mm blades. For a 40 mm hole, use a 39.75 mm drill with a Morse taper MT4 shank and ream in two passes. A No. 4 tap wrench fits the 15 mm square. Always turn clockwise.
Questions about drill bits, size selection, and operation
Frequently asked questions about hand reaming
This reamer covers holes from 37.5 to 45 mm. The 34-38.75 mm reamer covers holes from 37 to 37.5 mm. A 45 mm hole can also be made with the 38.75-46 mm and 45-54 mm reamers.
Drill it with a 39.75 mm drill bit with Morse taper MT4. Remove the 0.25 mm allowance in two passes: to 39.9 and 40.0 mm.
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 37 NWKc HSS DIN 345 Werko
Reference: 0419 In stock > 10 items
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€48.55 brutto
Metal drill bit 41 NWKc HSS DIN 345 Baildon
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