DIN 610 Hex Fit Bolts (Short Thread)

DIN 610 hex fit bolts with short thread, M8–M42 — the shank-dominated fitted bolt for precision shear joints, with the collected per-size tables: coarse/fine pitches, b ladder, d s k6, d 0, dual-value e/s cells, k, k 1 and r.

Last updated: 2026-11

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DIN 610 Hex Fit Bolts (Short Thread) in an industrial setting — Illustrative image redrawn from real product references — not a photograph of stocked items.

Specifications

DIN 610 is the short-thread member of the fit-bolt pair: same ground shank idea as DIN 609 (a K6/k6-toleranced cylindrical bearing surface for reamed holes) but with the thread kept short so the fitted shank dominates the bolt length. The collected b ladder runs 11.5–15.5 at M8–M12 against DIN 609's 14.5–27.5 — on a pure shear joint, that extra unthreaded length is what bears the load, with the nut just holding the stack together. The result is a bolt that locates like a dowel and clamps like a bolt: gear housings, bearing blocks, machine frames and die sets assembled to position without dowel-pinning twice. The collected tables run M8 to M42 in coarse plus two fine pitches, with the fitted shank printed "(k6)" max/min, the unthreaded portion d 0, head height k, bearing-check k 1 and fillet r. Two source quirks matter when reading the tables (both carried as table footnotes): several e and s cells print dual values separated by "/" — two variants as printed, no legend — and the across-flats at M10/M12 carries parenthesized alternates (16/(17), 18/(19)), so check the printed cell against your wrench standard. Property classes and finishes stay per RFQ.

Standard	DIN 610 — hexagon fit bolts with short thread (fitted shank for reamed holes)
Series	M8 – M42 (six source column groups; parenthesized non-preferred sizes) — coarse plus fine thread-1/2 pitch rows as printed
Tabulated geometry	Per size: pitch P (coarse/fine-1/fine-2), b ladder (L≤50 / 50<L≤150 / L>150), fitted shank d s (k6) max/min, unthreaded shank d 0 (min/max), e (min, dual '/'-separated values at some sizes), k (nominal/min/max), k 1 (min), r (min/max), s (max=nominal, min, dual/parenthesized values at some sizes)
Shank fit	d s to k6 as printed — size the reamed hole from the shank column (M8→9 mm, M10→11 mm …), not the thread designation
Property classes / finishes	Not tabulated by the collected specification — per RFQ (state hole diameter, ream tolerance and class at quotation)

DIN 610 hex fit bolts (short thread) - per-size dimensions (M8 - M12)All dimensions in millimeters. Attribute labels follow the source: P = thread pitch (coarse plus fine thread-1/2 rows, '-' where a fine pitch does not apply); b = thread length in three regimes; d s = fitted shank diameter with k6 tolerance as printed; d 0 = unthreaded shank diameter; e = width across corners; k = head height; k 1 = head-bearing check height; r = fillet radius; s = width across flats. Several cells print dual values separated by '/' (two tabulated variants as printed, no legend in the source) — kept verbatim. Parenthesized sizes are the non-preferred series as printed.
Attribute	M8	M10	M12
P — Pitch — Coarse thread	1.25	1.5	1.75
Fine thread-1	1	1.25	1.25
Fine thread-2	-	1	1.5
b — L≤50	11.5	13.5	15.5
50＜L≤150	13.5	15.5	17.5
L＞150	18.5	20.5	22.5
d s — (k6) — Nominal Size	9	11	13
max	9.01	11.012	13.012
min	9.001	11.001	13.001
d 0 — min	7.9	9.9	11.5
max	8.2	10.2	11.8
e — min	14.38	17.77/18.9	19.85/20.85
k — Nominal Size	5.3	6.4	7.5
min	5.15	6.22	7.21
max	5.45	6.58	7.79
k 1 — min	3.61	4.35	5.05
r — min	0.4	0.4	0.6
max	0.55	0.55	0.75
s — max=nominal size	13	16/(17)	18/(19)
min	12.73	15.73/16.73	17.57/18.48

Row 12 (e — min): Dual e values separated by '/' at M10 and M12 (17.77/18.9, 19.85/20.85) — two variants as printed; no legend is published for the split.
Row 19 (s — max=nominal size): Dual s values separated by '/' at M10 and M12, including parenthesized across-flats (16/(17), 18/(19)) — kept verbatim.

DIN 610 hex fit bolts (short thread) - per-size dimensions ((M14) - (M18))All dimensions in millimeters. Attribute labels follow the source: P = thread pitch (coarse plus fine thread-1/2 rows, '-' where a fine pitch does not apply); b = thread length in three regimes; d s = fitted shank diameter with k6 tolerance as printed; d 0 = unthreaded shank diameter; e = width across corners; k = head height; k 1 = head-bearing check height; r = fillet radius; s = width across flats. Several cells print dual values separated by '/' (two tabulated variants as printed, no legend in the source) — kept verbatim. Parenthesized sizes are the non-preferred series as printed.
Attribute	(M14)	M16	(M18)
P — Pitch — Coarse thread	2	2	2.5
Fine thread-1	1.5	1.5	1.5
Fine thread-2	-	-	2
b — L≤50	17	19	21.5
50＜L≤150	19	21	23.5
L＞150	24	26	28.5
d s — (k6) — Nominal Size	15	17	19
max	15.012	17.012	19.015
min	15.001	17.001	19.002
d 0 — min	13.5	15.5	17.5
max	13.8	15.8	17.8
e — min	22.78/23.91	26.17	29.56
k — Nominal Size	8.8	10	11.5
min	8.51	9.71	11.15
max	9.09	10.29	11.85
k 1 — min	5.96	6.8	7.81
r — min	0.6	0.6	0.6
max	0.75	0.75	0.75
s — max=nominal size	21/(22)	24	27
min	20.16/21.15	23.16	26.16

Row 12 (e — min): Dual e values separated by '/' at (M14) (22.78/23.91) — two tabulated variants as printed, no legend in the source; kept verbatim.
Row 19 (s — max=nominal size): Dual s values separated by '/' at (M14), including parenthesized across-flats (21/(22)) — kept verbatim.
Row 20 (min): Dual s min values separated by '/' at (M14) (20.16/21.15) — kept verbatim.

DIN 610 hex fit bolts (short thread) - per-size dimensions (M20 - M24)All dimensions in millimeters. Attribute labels follow the source: P = thread pitch (coarse plus fine thread-1/2 rows, '-' where a fine pitch does not apply); b = thread length in three regimes; d s = fitted shank diameter with k6 tolerance as printed; d 0 = unthreaded shank diameter; e = width across corners; k = head height; k 1 = head-bearing check height; r = fillet radius; s = width across flats. Several cells print dual values separated by '/' (two tabulated variants as printed, no legend in the source) — kept verbatim. Parenthesized sizes are the non-preferred series as printed.
Attribute	M20	(M22)	M24
P — Pitch — Coarse thread	2.5	2.5	3
Fine thread-1	1.5	1.5	2
Fine thread-2	2	2	1.5
b — L≤50	22.5	24.5	26.5
50＜L≤150	24.5	26.5	28.5
L＞150	29.5	31.5	33.5
d s — (k6) — Nominal Size	21	23	25
max	21.015	23.015	25.015
min	21.002	23.002	25.002
d 0 — min	19.1	21.1	23.1
max	19.4	21.4	23.4
e — min	32.95	35.03/37.29	39.55
k — Nominal Size	12.5	14	15
min	12.15	13.65	14.65
max	12.85	14.35	15.35
k 1 — min	8.51	9.65	10.26
r — min	0.8	0.8	0.8
max	0.95	0.95	0.95
s — max=nominal size	30	(32)/34	36
min	29.16	31/33	35

Row 12 (e — min): Dual e values separated by '/' at (M22) (35.03/37.29) — two tabulated variants as printed, no legend in the source; kept verbatim.
Row 19 (s — max=nominal size): Dual s values separated by '/' at (M22), including parenthesized across-flats ((32)/34) — kept verbatim.
Row 20 (min): Dual s min values separated by '/' at (M22) (31/33) — kept verbatim.

DIN 610 hex fit bolts (short thread) - per-size dimensions ((M27) - (M33))All dimensions in millimeters. Attribute labels follow the source: P = thread pitch (coarse plus fine thread-1/2 rows, '-' where a fine pitch does not apply); b = thread length in three regimes; d s = fitted shank diameter with k6 tolerance as printed; d 0 = unthreaded shank diameter; e = width across corners; k = head height; k 1 = head-bearing check height; r = fillet radius; s = width across flats. Several cells print dual values separated by '/' (two tabulated variants as printed, no legend in the source) — kept verbatim. Parenthesized sizes are the non-preferred series as printed.
Attribute	(M27)	M30	(M33)
P — Pitch — Coarse thread	3	3.5	3.5
Fine thread-1	2	2	2
Fine thread-2	-	-	-
b — L≤50	-	-	-
50＜L≤150	31.5	34	36
L＞150	36.5	39	41
d s — (k6) — Nominal Size	28	32	34
max	28.015	32.018	34.018
min	28.002	32.002	34.002
d 0 — min	25.7	29.7	31.7
max	26	30	32
e — min	45.2	50.85	55.37
k — Nominal Size	17	19	21
min	16.65	18.58	20.58
max	17.35	19.42	21.42
k 1 — min	11.66	13.01	14.41
r — min	1	1	1
max	1.15	1.15	1.15
s — max=nominal size	41	46	50
min	40	45	49

DIN 610 hex fit bolts (short thread) - per-size dimensions (M36 - M42)All dimensions in millimeters. Attribute labels follow the source: P = thread pitch (coarse plus fine thread-1/2 rows, '-' where a fine pitch does not apply); b = thread length in three regimes; d s = fitted shank diameter with k6 tolerance as printed; d 0 = unthreaded shank diameter; e = width across corners; k = head height; k 1 = head-bearing check height; r = fillet radius; s = width across flats. Several cells print dual values separated by '/' (two tabulated variants as printed, no legend in the source) — kept verbatim. Parenthesized sizes are the non-preferred series as printed.
Attribute	M36	(M39)	M42
P — Pitch — Coarse thread	4	4	4.5
Fine thread-1	3	3	3
Fine thread-2	-	-	-
b — L≤50	-	-	-
50＜L≤150	40	42	46
L＞150	45	47	51
d s — (k6) — Nominal Size	38	40	44
max	38.018	40.018	44.018
min	38.002	40.002	44.002
d 0 — min	35.7	37.7	41.7
max	36	38	42
e — min	60.79	66.44	71.3
k — Nominal Size	22	25	26
min	21.58	24.58	25.58
max	22.42	25.42	26.42
k 1 — min	15.11	17.21	17.91
r — min	1	1	1
max	1.15	1.15	1.15
s — max=nominal size	55	60	65
min	53.8	58.8	63.1

DIN 610 hex fit bolts (short thread) - per-size dimensions ((M45) - (M52))All dimensions in millimeters. Attribute labels follow the source: P = thread pitch (coarse plus fine thread-1/2 rows, '-' where a fine pitch does not apply); b = thread length in three regimes; d s = fitted shank diameter with k6 tolerance as printed; d 0 = unthreaded shank diameter; e = width across corners; k = head height; k 1 = head-bearing check height; r = fillet radius; s = width across flats. Several cells print dual values separated by '/' (two tabulated variants as printed, no legend in the source) — kept verbatim. Parenthesized sizes are the non-preferred series as printed.
Attribute	(M45)	M48	(M52)
P — Pitch — Coarse thread	4.5	5	5
Fine thread-1	3	3	3
Fine thread-2	-	-	-
b — L≤50	-	-	-
50＜L≤150	48	51	55
L＞150	53	56	60
d s — (k6) — Nominal Size	46	50	55
max	46.018	50.018	55.021
min	46.002	50.002	55.002
d 0 — min	43.7	47.7	52.7
max	44	48	53
e — min	76.95	82.6	88.25
k — Nominal Size	28	30	33
min	27.58	29.58	32.5
max	28.42	30.42	33.5
k 1 — min	19.31	20.71	22.75
r — min	1	1	1
max	1.15	1.15	1.15
s — max=nominal size	70	75	80
min	68.1	73.1	78.1

Materials

Material and property class specified per RFQ — shear-critical fit-bolt joints are typically assembled with class 8.8/10.9 into H7-reamed holes; confirm the fit pair at quotation

Ordering & documentation

Documents

Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.

Quotation

The fastener family (DIN 610 Hex Fit Bolts (Short Thread)) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
Quantity per size and your target delivery date.
Destination country, and any required documents (for example a mill test certificate) so the quote includes them.

Sample & supply

Minimum order quantity is 1,000–10,000 pieces depending on size. Stock items run 3–7 days. High-strength and custom parts run 15–25 days. Quantities or variants outside the standard range are confirmed at quotation.

Storage & shipping

Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.

Frequently asked questions

Why choose a short-thread fit bolt for a shear joint?

Because in shear, the unthreaded ground shank is the working surface. A thread crest is a saw profile — running shear across an engaged thread chews the hole and plays in the clearance. DIN 610 keeps that thread to the minimum needed to draw the joint (the collected tables show b at roughly two-thirds of DIN 609's for the same size) and hands the rest of the bolt to the k6 shank, which bears across the plates in a reamed hole with line-to-line fit. Use it where the parts are already located and the bolt's job is to hold that location under reversing or shock load: bearing blocks on shafts, machine feet, die segments, slewing-ring splices. Where the joint needs drawing-up over a stack or adjustment range, step to long-thread DIN 609 instead. When ordering, quote three things together — shank diameter (for the hole), thread size (for the nut) and the reamed tolerance — and note the source's dual e/s cells (see the table footnotes) so the wrench sizes are confirmed against the variant you receive.

What is the MOQ and lead time for this bolt type?

The minimum order quantity is 1,000–10,000 pieces depending on size. Stock items ship in 3–7 days; high-strength and custom parts in 15–25 days. Common sizes in this bolt type are widely stocked; confirm the exact schedule against quantity and size mix at quotation.

Related knowledge

Request a Quote

Get factory-direct pricing from the manufacturer.

What to include in your inquiry

✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
✓ Sizes, lengths and thread type (metric or inch).
✓ Quantity per size and your target delivery date.
✓ Destination country, plus any coating or finish requirement.
✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.

✓ Factory-direct pricing
✓ Standard and custom specifications
✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
✓ Full fastener family support

DIN 610 Hex Fit Bolts (Short Thread)

Specifications

Materials

Ordering & documentation

Documents

Quotation

Sample & supply

Storage & shipping

Frequently asked questions

Why choose a short-thread fit bolt for a shear joint?

What is the MOQ and lead time for this bolt type?

Related grades & products

Related knowledge

Request a Quote

What to include in your inquiry