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EWN precision boring bar, diameter 20-510mm

Kortools

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EWN20-36 LBK1

EWN25-47 LBK2

EWN32-60 LBK3

EWN41-74 LBK4

EWN53-95 LBK5

EWN68-150 LBK6

EWN100-203 LBK6

EWN200-310 BST

EWN300-410 BST

EWN400-510 BST

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Product description

SMS EWN fine boring heads — 20–510 mm

LBK heads · BST bridge boring heads · ENH insert holders

The SMS EWN system includes adjustable fine boring heads and replaceable ENH insert holders. The working range depends on the selected head and holder. BST bridge heads have separate ranges for internal boring and external turning.

1. System components and applications

Component	Application
SMS EWN / LBK	Fine boring with diameter micro-adjustment; forward and back-boring ranges depend on the holder.
BST	Bridge heads for large bores and external diameters within the ranges listed below.
ENH	Replaceable insert holders. An ENH option is the holder alone, without a head or cutting insert.

The heads have steel bodies with an adjustment mechanism and a setting lock. The insert is a separate cutting component. Select the head, holder and insert family together.

2. LBK head specifications

Head	Range [mm]	Interface	Working L [mm]	Insert
SMS20-36	20–36	LBK1	33.5	TP0802
SMS25-47	25–47	LBK2	37	TP0802
SMS32-60	32–60	LBK3	43	TP0802
SMS41-74	41–74	LBK4	51.5	TC1102
SMS53-95	53–95	LBK5	60	TC1102
SMS68-150	68–150	LBK6	71	TC1102
SMS100-203	100–203	LBK6	71	TC1102

L refers to the working section marked by dimension lines on the head card. The LBK interface is listed separately. A holder number in the range table identifies a configuration of that particular head, not universal compatibility with every ENH holder carrying the same final number.

3. Complete ranges for holders 1, 2 and 3

Head	Operation	Holder 1 [mm]	Holder 2 [mm]	Holder 3 [mm]
SMS20-36	Forward	20–26	25–31	30–36
SMS20-36	Back	—	30–31	30–36
SMS25-47	Forward	25–33	32–40	39–47
SMS25-47	Back	—	36–40	39–47
SMS32-60	Forward	32–42	41–51	50–60
SMS32-60	Back	—	46–51	50–60
SMS41-74	Forward	41–54	50–63	61–74
SMS41-74	Back	—	53–63	61–74
SMS53-95	Forward	53–70	65–82	78–95
SMS53-95	Back	62–70	69–82	78–95
SMS68-150	Forward	68–100	94–126	118–150
SMS68-150	Back	80–100	94–126	118–150
SMS100-203	Forward	100–153	126–179	150–203
SMS100-203	Back	112–153	126–179	150–203

All ranges are diameters in millimetres. A dash indicates no back-boring range for that configuration in this table. SMS53–95 remains a head with a maximum range of 95 mm. When selecting a separate holder, also check its own card: ENH1-3 (30–35) TP08 has a forward range of 30–35 mm and a back-boring range of 30–36 mm; these are not replaced by the overall head range.

4. BST bridge boring heads

Internal boring [mm]	External turning [mm]	Interface	Overall height [mm]	Cutting-head height [mm]	Insert
200–310	86–216	BST	117	60	TC1102
300–410	186–316	BST	117	60	TC1102
400–510	286–416	BST	121	60	TC1102

External turning and back boring are different operations. For bridge heads, use either the internal-boring or external-turning range above, according to the operation. The BST toolholder is selected separately.

5. Ranges of separate ENH holders

Holder	Head designation	Forward [mm]	Back [mm]	Insert version
ENH1-1	SMS20-36	20–26	—	TP08
ENH1-2	SMS20-36	25–31	30–31	TP08
ENH1-3	SMS20-36	30–35	30–36	TP08
ENH2-1	SMS25-47	25–33	—	TP08
ENH2-2	SMS25-47	32–40	36–40	TP08
ENH2-3	SMS25-47	39–47	39–47	TP08
ENH3-1	SMS32-60	32–42	—	TP08
ENH3-2	SMS32-60	41–51	46–51	TP08
ENH3-3	SMS32-60	50–60	50–60	TP08
ENH4-1	SMS41-74	41–54	—	TC11 / TP11
ENH4-2	SMS41-74	50–63	53–63	TC11 / TP11
ENH4-3	SMS41-74	61–74	61–74	TC11 / TP11
ENH5-1	SMS53-105	53–72	—	TC11 / TP11
ENH5-2	SMS53-105	70–88	70–88	TC11 / TP11
ENH5-3	SMS53-105	85–105	85–105	TC11 / TP11
ENH6-1	SMS68-150	68–100	80–100	TC11 / TP11
ENH6-2	SMS68-150	94–126	94–126	TC11 / TP11
ENH6-3	SMS68-150	118–150	118–150	TC11 / TP11

TC11 and TP11 denote separate holder versions, not two interchangeable insert choices for one holder. A dash is shown where no back-boring range is specified. Select an ENH option by its complete designation and insert family.

ENH5 and SMS53–95: the ENH5 holders in this table carry the SMS53–105 head designation and have their own ranges of 53–72, 70–88 and 85–105 mm. These are separate from the SMS53–95 head table. Similar 53–95 and 53–105 designations do not establish compatibility.

6. Scale and fine-adjustment sequence

One division changes the diameter setting by 0.01 mm, equivalent to 0.005 mm radially. This describes the mechanism setting, not a guaranteed finished-bore tolerance or roundness.

Step	Action
1	Release the adjustment mechanism locking screw.
2	Turn the dial back by half a turn to take up clearance before the final setting.
3	Adjust the dial to the required diameter within the range of the head and insert holder.
4	Tighten the locking screw again after setting.

7. Insert and mounting selection

Head version	Insert system	Insert retaining screw
SMS20–36 / 25–47 / 32–60	TP0802 (TP08)	M2×4
SMS41–74 / 53–95 / 68–150 / 100–203	TC1102 (TC11)	M2.5×6
BST 200–310 / 300–410 / 400–510	TC1102 (TC11)	M2.5×6

Cutting inserts are sold separately. The screw table applies to the listed head versions and insert systems; it does not extend that specification to optional TP11 holders. The LBK or BST head connection and the insert retaining screw are separate interfaces.

8. Questions before selection

Is the head range enough to choose a holder?
No. Check the holder number, its own forward and back ranges and its insert type.

Is an ENH holder a complete boring head?
No. An ENH option is a separate insert holder, without the head or cutting insert.

Does back boring have the same range as forward boring?
Not always. Use the two separate rows for the head, or the card for the particular holder.

What should be checked when selecting a bridge head?
The internal or external diameter range, overall height, BST interface and TC1102 insert system.