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Mongtec HSK-A end mill holders

136 article numbers on HSK50A · HSK63A · HSK80A · HSK100A. Weldon side-lock, Whistle Notch and coolant-channel end mill holders on the HSK-A taper, Ø6 to Ø50 mm. Mongtec Precision is a Taiwanese brand, designed and engineered in Taichung, Taiwan.

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Side lock on a face-contact taper

A Weldon holder clamps a set screw against a ground flat on the tool shank. It is the most positive drive available — the tool cannot rotate in the bore no matter what the cut does — and that is why roughing cutters and high-feed mills are held this way.

The trade is concentricity: the screw pushes the shank sideways by design, so a side-lock holder always runs out more than a collet or a shrink fit. Rough in Weldon; finish in something concentric.

Putting that on an HSK-A taper is a deliberate combination. Weldon is the grip that handles the heaviest cuts, and HSK is the interface that stays put under them — face contact means the holder cannot creep out of the spindle as the load and the speed change. If you are going to rough hard, this is the pairing that holds its setting.

The three families

SLA (Weldon) — Ø6–50 mm, HSK50A to HSK100A, in standard lengths and to 160 mm. Above Ø25 mm the catalogue specifies two clamping screws rather than one, which spreads the load and keeps the shank straighter.

SLA K version — the same body with coolant channels added.

SLB (Whistle Notch) — the angled flat locks rotation and simultaneously pulls the tool back against the holder face, so it locates axially as well. Ø6–40 mm.

SEMC — dedicated coolant-channel holders, Ø16–40 mm, for solid cutters without internal coolant where the flow has to be guided down the outside to clear a deep pocket.

Article numbers — dimensions in mm

Dimension symbols are the catalogue's own and refer to the dimension drawing printed for each product. A dash means the catalogue does not print a usable value for that cell; those are confirmed in writing at RFQ. Where a table's printed header disagrees with its drawing, a note above the table says so.

End Mill Holder with Coolant Channels — 23 article numbers

Article no.	d	D	L	L1
HSK50AQSEMC16Q50	16	32	50	17
HSK50AQSEMC22Q50	22	40	50	19
HSK50AQSEMC27Q65	27	48	65	21
HSK50AQSEMC32Q65	32	58	65	24
HSK63AQSEMC16Q60	16	32	60	17
HSK63AQSEMC22Q60	22	40	60	19
HSK63AQSEMC27Q60	27	48	60	21
HSK63AQSEMC32Q60	32	58	60	24
HSK63AQSEMC40Q70	40	70	70	27
HSK63AQSEMC16Q100	16	32	100	17
HSK63AQSEMC22Q100	22	40	100	19
HSK63AQSEMC27Q100	27	48	100	21
HSK63AQSEMC32Q100	32	58	100	24
HSK80AQSEMC16Q60	16	32	60	17
HSK80AQSEMC22Q60	22	40	60	19
HSK80AQSEMC27Q60	27	48	60	21
HSK80AQSEMC32Q60	32	58	60	24
HSK80AQSEMC40Q70	40	70	70	27
HSK100AQSEMC16Q60	16	32	60	17
HSK100AQSEMC22Q60	22	40	60	19
HSK100AQSEMC27Q60	27	48	60	21
HSK100AQSEMC32Q60	32	58	60	24
HSK100AQSEMC40Q70	40	70	70	27

End Mill Holder (Weldon) — 91 article numbers

Article no.	d	D	L	M	Screw Quantity
HSK50AQSLA06Q65	6	25	65	M6	1
HSK50AQSLA08Q65	8	28	65	M8	1
HSK50AQSLA10Q65	10	35	65	M10	1
HSK50AQSLA12Q80	12	42	80	M12	1
HSK50AQSLA14Q80	14	44	80	M12	1
HSK50AQSLA16Q80	16	48	80	M14	1
HSK50AQSLA18Q80	18	50	80	M14	1
HSK50AQSLA20Q80	20	52	80	M16	1
HSK50AQSLA25Q110	25	60	110	M18*2	2
HSK50AQSLA32Q110	32	60	110	M20*2	2
HSK63AQSLA06Q65	6	25	65	M6	1
HSK63AQSLA08Q65	8	28	65	M8	1
HSK63AQSLA10Q65	10	35	65	M10	1
HSK63AQSLA12Q80	12	42	80	M12	1
HSK63AQSLA14Q80	14	44	80	M12	1
HSK63AQSLA16Q80	16	48	80	M14	1
HSK63AQSLA20Q80	20	52	80	M16	1
HSK63AQSLA25Q110	25	65	110	M18*2	2
HSK63AQSLA32Q110	32	72	110	M20*2	2
HSK63AQSLA40Q125	40	80	125	M20*2	2
HSK63AQSLA06Q100	6	25	100	M6	1
HSK63AQSLA08Q100	8	28	100	M8	1
HSK63AQSLA10Q100	10	35	100	M10	1
HSK63AQSLA14Q100	14	44	100	M12	1
HSK63AQSLA16Q100	16	48	100	M12	1
HSK63AQSLA18Q100	18	50	100	M14	1
HSK63AQSLA20Q100	20	52	100	M16	1
HSK63AQSLA06Q160	6	25	160	M6	1
HSK63AQSLA08Q160	8	28	160	M8	1
HSK63AQSLA10Q160	10	35	160	M10	1
HSK63AQSLA12Q160	12	42	160	M12	1
HSK63AQSLA14Q160	14	44	160	M12	1
HSK63AQSLA16Q160	16	48	160	M14	1
HSK63AQSLA18Q160	18	50	160	M14	1
HSK63AQSLA20Q160	20	52	160	M16	1
HSK63AQSLA25Q160	25	65	160	M18*2	2
HSK63AQSLA32Q160	32	72	160	M20*2	2
HSK80AQSLA06Q80	6	25	80	M6	1
HSK80AQSLA08Q80	8	28	80	M8	1
HSK80AQSLA10Q80	10	35	80	M10	1
HSK80AQSLA12Q80	12	42	80	M12	1
HSK80AQSLA14Q80	14	44	80	M12	1
HSK80AQSLA16Q100	16	48	100	M14	1
HSK80AQSLA18Q100	18	50	100	M14	1
HSK80AQSLA20Q100	20	52	100	M16	1
HSK80AQSLA25Q100	25	65	100	M18*2	2
HSK80AQSLA32Q110	32	72	110	M20*2	2
HSK80AQSLA40Q120	40	80	120	M20*2	2
HSK100AQSLA08Q80	8	28	80	M8	1
HSK100AQSLA10Q80	10	35	80	M10	1
HSK100AQSLA12Q80	12	42	80	M12	1
HSK100AQSLA14Q80	14	44	80	M12	1
HSK100AQSLA16Q100	16	48	100	M14	1
HSK100AQSLA18Q100	18	50	100	M14	1
HSK100AQSLA20Q100	20	52	100	M16	1
HSK100AQSLA25Q100	25	65	100	M18*2	2
HSK100AQSLA32Q100	32	72	100	M20*2	2
HSK100AQSLA40Q105	40	80	105	M20*2	2
HSK100AQSLA50Q130	50	100	130	M24*2	2
HSK100AQSLA08Q160	8	28	160	M8	1
HSK100AQSLA10Q160	10	35	160	M10	1
HSK100AQSLA12Q160	12	42	160	M12	1
HSK100AQSLA14Q160	14	44	160	M12	1
HSK100AQSLA16Q160	16	48	160	M14	1
HSK100AQSLA18Q160	18	50	160	M14	1
HSK100AQSLA20Q160	20	52	160	M16	1
HSK100AQSLA25Q160	25	65	160	M18*2	2
HSK100AQSLA32Q160	32	72	160	M20*2	2
HSK100AQSLA40Q160	40	80	160	M20*2	2
HSK63AQSLA06Q65K	6	25	65	M6	1
HSK63AQSLA08Q65K	8	28	65	M8	1
HSK63AQSLA10Q65K	10	35	65	M10	1
HSK63AQSLA12Q80K	12	42	80	M12	1
HSK63AQSLA14Q80K	14	44	80	M12	1
HSK63AQSLA16Q80K	16	48	80	M14	1
HSK63AQSLA18Q80K	18	50	80	M14	1
HSK63AQSLA20Q80K	20	52	80	M16	1
HSK63AQSLA25Q110K	25	65	110	M18*2	2
HSK63AQSLA32Q110K	32	72	110	M20*2	2
HSK63AQSLA40Q125K	40	80	125	M20*2	2
HSK100AQSLA06Q80K	6	25	80	M6	1
HSK100AQSLA08Q80K	8	28	80	M8	1
HSK100AQSLA10Q80K	10	35	80	M10	1
HSK100AQSLA12Q80K	12	42	80	M12	1
HSK100AQSLA14Q80K	14	44	80	M12	1
HSK100AQSLA16Q100K	16	48	100	M14	1
HSK100AQSLA18Q100K	18	50	100	M14	1
HSK100AQSLA20Q100K	20	52	100	M16	1
HSK100AQSLA25Q100K	25	65	100	M18*2	2
HSK100AQSLA32Q100K	32	72	100	M20*2	2
HSK100AQSLA40Q105K	40	80	105	M20*2	2

End Mill Holder (Whistle Notch) — 22 article numbers

Article no.	d	D	L	M	Screw Quantity
HSK63AQSLB06Q80	6	25	80	M6	1
HSK63AQSLB08Q80	8	28	80	M8	1
HSK63AQSLB10Q80	10	35	80	M10	1
HSK63AQSLB12Q90	12	42	90	M12	1
HSK63AQSLB14Q90	14	44	90	M12	1
HSK63AQSLB16Q100	16	48	100	M14	1
HSK63AQSLB18Q100	18	50	100	M14	1
HSK63AQSLB20Q100	20	52	100	M16	1
HSK63AQSLB25Q110	25	65	110	M18*2	2
HSK63AQSLB32Q110	32	72	110	M20*2	2
HSK63AQSLB40Q125	40	80	125	M20*2	2
HSK100AQSLB06Q90	6	25	90	M6	1
HSK100AQSLB08Q90	8	28	90	M8	1
HSK100AQSLB10Q90	10	35	90	M10	1
HSK100AQSLB12Q100	12	42	100	M12	1
HSK100AQSLB14Q100	14	44	100	M12	1
HSK100AQSLB16Q100	16	48	100	M14	1
HSK100AQSLB18Q100	18	50	100	M14	1
HSK100AQSLB20Q110	20	52	110	M16	1
HSK100AQSLB25Q120	25	65	120	M18*2	2
HSK100AQSLB32Q120	32	72	120	M20*2	2
HSK100AQSLB40Q120	40	80	120	M20*2	2

Source: Mongtec HSK-A Tooling System catalogue, Ver 2026.

Check the HSK form, not just the size. HSK-A, C, E and F share the size number but not the drive slots, coolant provision or flange geometry, and they are not interchangeable. Send Mongtec the machine make, model and the spindle interface designation with the RFQ.

Frequently asked

Why put a side-lock holder on an expensive HSK taper?

Because the two solve different problems. The side lock stops the tool turning in the holder; the HSK face contact stops the holder moving in the spindle. Heavy roughing attacks both, and this pairing answers both.

How much run-out does a Weldon holder add?

Enough to matter for finishing and not enough to matter for roughing. Mongtec does not publish a single figure because it depends on the tolerance of the tool shank. If the operation is finish-critical, use a collet, hydraulic or shrink-fit holder.

SLA or SLA K?

Identical geometry; the K version adds coolant channels. Choose K if your cutters have no internal coolant and you are cutting deep.