ISO 8765 Hex Head Bolts (Fine Pitch)

ISO 8765 hexagon head bolts with shank and metric fine pitch thread, M8×1 to M64×4 — the partially threaded fine-pitch counterpart of ISO 4014, with the collected per-size tables: pitch, b thread-length regimes, c, d a, d s, d w, e, k, k 1, L 1, r, s and the b 1/b 2/b 3 summary rows.

Last updated: 2026-11

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ISO 8765 Hex Head Bolts (Fine Pitch) in an industrial setting — Illustrative image redrawn from real product references — not a photograph of stocked items.

Specifications

ISO 8765 is the fine-pitch version of the classic partially threaded hex bolt: hex head, plain shank, machine thread, but with a metric fine pitch instead of the coarse ISO 4014 thread. The fine pitch earns its place where a coarse thread is the weak point: thin-walled or hard materials where full coarse depth will not fit, dynamic loading where the finer helix resists backing off, and adjustment duty where each turn moves the clamp less. The collected tables (the page notes it replaces DIN 960) run M8×1 to M64×4, with sizes repeated where two fine pitches exist — M10 appears at 1.25 and at 1, M12 at 1.5 and 1.25, and so on — so order by diameter and pitch together. Per size the tables carry the b thread-length ladder across the three length regimes (L≤125 / 125<L≤200 / L>200), chamfer c, transition d a, shank d s, bearing-face d w, across-corners e, head height k, k 1, the L 1 grip adder, fillet r and across-flats s, in product grades A and B — with "/" where Grade A data is not tabulated above M24, kept verbatim and disclosed. Property classes and finishes are not printed by the collected specification and stay per RFQ.

Standard	ISO 8765 — hexagon head bolts with shank (partially threaded), metric fine pitch thread; the collected page notes it replaces DIN 960
Series	M8×1 – M64×4 (nine source column groups; sizes repeated per pitch option as printed — M10 at 1.25 and 1, M12 at 1.5 and 1.25, M16/M20/M22/M24/M27/M30 likewise)
Tabulated geometry	Per size: pitch P, b per length regime (L≤125 / 125<L≤200 / L>200), c, d a, d s (max/min), d w (Grade A/B min), e (Grade A/B min), k (nominal, Grade A/B max/min), k 1, L 1 (max), r (min), s (max=nominal, Grade A/B min)
Product grades	A and B as printed; Grade A rows are "/" above M24 — per the source, Grade B applies in the large series
Property classes / finishes	Not tabulated by the collected specification — per RFQ (state class and pitch explicitly: 10.9 M12×1.25, not "fine M12")

ISO 8765 hex head bolts (fine pitch) - per-size dimensions (M8 - (M10))All dimensions in millimeters. Attribute labels follow the source: P = thread pitch; b = thread length in the three length regimes (L≤125 / 125<L≤200 / L>200) as printed; c = chamfer height; d a = transition diameter; d s = shank diameter; d w = bearing-face diameter; e = width across corners; k = head height; k 1 = head-bearing check height; L 1 = min grip length adder; r = fillet radius; s = width across flats; b 1/b 2/b 3 = the 'Length of Thread b' summary rows the source reprints. '/' where the source does not tabulate the cell; '-' where a regime does not apply. The collected page states the standard replaces DIN 960.
Attribute	M8	M10	(M10)
P — Pitch	1	1.25	1
b — L≤125	22	26	26
125＜L≤200	28	32	32
L＞200	41	45	45
c — max	0.6	0.6	0.6
min	0.15	0.15	0.15
d a — max	9.2	11.2	11.2
d s — max=nominal size	8	10	10
Grade A — min	7.78	9.78	9.78
Grade B — min	7.64	9.64	9.64
d w — Grade A — min	11.63	14.63	14.63
Grade B — min	11.47	14.47	14.47
e — Grade A — min	14.38	17.77	17.77
Grade B — min	14.2	17.59	17.59
k — Nominal Size	5.3	6.4	6.4
Grade A — max	5.45	6.58	6.58
min	5.15	6.22	6.22
Grade B — max	5.54	6.69	6.69
min	5.06	6.11	6.11
k 1 — Grade A — min	3.61	4.35	4.35
Grade B — min	3.54	4.28	4.28
L 1 — max	2	2	2
r — min	0.4	0.4	0.4
s — max=nominal size	13	16	16
Grade A — min	12.73	15.73	15.73
Grade B — min	12.57	15.57	15.57
Length of Thread b — b 1	22	26	26
b 2	28	32	32
b 3	-	45	45

ISO 8765 hex head bolts (fine pitch) - per-size dimensions (M12 - (M14))All dimensions in millimeters. Attribute labels follow the source: P = thread pitch; b = thread length in the three length regimes (L≤125 / 125<L≤200 / L>200) as printed; c = chamfer height; d a = transition diameter; d s = shank diameter; d w = bearing-face diameter; e = width across corners; k = head height; k 1 = head-bearing check height; L 1 = min grip length adder; r = fillet radius; s = width across flats; b 1/b 2/b 3 = the 'Length of Thread b' summary rows the source reprints. '/' where the source does not tabulate the cell; '-' where a regime does not apply. The collected page states the standard replaces DIN 960.
Attribute	M12	(M12)	(M14)
P — Pitch	1.5	1.25	1.5
b — L≤125	30	30	34
125＜L≤200	36	36	40
L＞200	49	49	57
c — max	0.6	0.6	0.6
min	0.15	0.15	0.15
d a — max	13.7	13.7	15.7
d s — max=nominal size	12	12	14
Grade A — min	11.73	11.73	13.73
Grade B — min	11.57	11.57	13.54
d w — Grade A — min	16.63	16.63	19.64
Grade B — min	16.47	16.47	19.15
e — Grade A — min	20.03	20.03	23.36
Grade B — min	19.85	19.85	22.78
k — Nominal Size	7.5	7.5	8.8
Grade A — max	7.68	7.68	8.98
min	7.32	7.32	8.62
Grade B — max	7.79	7.79	9.09
min	7.21	7.21	8.51
k 1 — Grade A — min	5.12	5.12	6.03
Grade B — min	5.05	5.05	5.96
L 1 — max	3	3	3
r — min	0.6	0.6	0.6
s — max=nominal size	18	18	21
Grade A — min	17.73	17.73	20.67
Grade B — min	17.57	17.57	20.16
Length of Thread b — b 1	30	30	34
b 2	36	36	40
b 3	49	49	53

ISO 8765 hex head bolts (fine pitch) - per-size dimensions (M16 - (M18))All dimensions in millimeters. Attribute labels follow the source: P = thread pitch; b = thread length in the three length regimes (L≤125 / 125<L≤200 / L>200) as printed; c = chamfer height; d a = transition diameter; d s = shank diameter; d w = bearing-face diameter; e = width across corners; k = head height; k 1 = head-bearing check height; L 1 = min grip length adder; r = fillet radius; s = width across flats; b 1/b 2/b 3 = the 'Length of Thread b' summary rows the source reprints. '/' where the source does not tabulate the cell; '-' where a regime does not apply. The collected page states the standard replaces DIN 960.
Attribute	M16	(M18)	(M18)
P — Pitch	1.5	2	1.5
b — L≤125	38	42	42
125＜L≤200	44	48	48
L＞200	/	/	/
c — max	0.8	0.8	0.8
min	0.2	0.2	0.2
d a — max	17.7	20.2	20.2
d s — max=nominal size	16	18	18
Grade A — min	15.73	17.73	17.73
Grade B — min	15.57	17.57	17.57
d w — Grade A — min	22.49	25.34	25.34
Grade B — min	22	24.85	24.85
e — Grade A — min	26.75	30.14	30.14
Grade B — min	26.17	29.56	29.56
k — Nominal Size	10	11.5	11.5
Grade A — max	10.18	11.715	11.715
min	9.82	11.285	11.285
Grade B — max	10.29	11.85	11.85
min	9.71	11.15	11.15
k 1 — Grade A — min	6.87	7.9	7.9
Grade B — min	6.8	7.81	7.81
L 1 — max	3	3	3
r — min	0.6	0.6	0.6
s — max=nominal size	24	27	27
Grade A — min	23.67	26.67	26.67
Grade B — min	23.16	26.16	26.16
Length of Thread b — b 1	38	42	42
b 2	44	48	48
b 3	57	61	61

ISO 8765 hex head bolts (fine pitch) - per-size dimensions (M20 - (M22))All dimensions in millimeters. Attribute labels follow the source: P = thread pitch; b = thread length in the three length regimes (L≤125 / 125<L≤200 / L>200) as printed; c = chamfer height; d a = transition diameter; d s = shank diameter; d w = bearing-face diameter; e = width across corners; k = head height; k 1 = head-bearing check height; L 1 = min grip length adder; r = fillet radius; s = width across flats; b 1/b 2/b 3 = the 'Length of Thread b' summary rows the source reprints. '/' where the source does not tabulate the cell; '-' where a regime does not apply. The collected page states the standard replaces DIN 960.
Attribute	M20	(M20)	(M22)
P — Pitch	2	1.5	2
b — L≤125	46	46	50
125＜L≤200	52	52	56
L＞200	/	/	69
c — max	0.8	0.8	0.8
min	0.2	0.2	0.2
d a — max	22.4	22.4	24.4
d s — max=nominal size	20	20	22
Grade A — min	19.67	19.67	21.67
Grade B — min	19.48	19.48	21.48
d w — Grade A — min	28.19	28.19	31.71
Grade B — min	27.7	27.7	31.35
e — Grade A — min	33.53	33.53	37.72
Grade B — min	32.95	32.95	37.29
k — Nominal Size	12.5	12.5	14
Grade A — max	12.715	12.715	14.215
min	12.285	12.285	13.785
Grade B — max	12.85	12.85	14.35
min	12.15	12.15	13.65
k 1 — Grade A — min	8.6	8.6	9.65
Grade B — min	8.51	8.51	9.56
L 1 — max	4	4	4
r — min	0.8	0.8	0.8
s — max=nominal size	30	30	34
Grade A — min	29.67	29.67	33.38
Grade B — min	29.16	29.16	33
Length of Thread b — b 1	46	46	50
b 2	52	52	56
b 3	65	65	69

ISO 8765 hex head bolts (fine pitch) - per-size dimensions ((M22) - M27)All dimensions in millimeters. Attribute labels follow the source: P = thread pitch; b = thread length in the three length regimes (L≤125 / 125<L≤200 / L>200) as printed; c = chamfer height; d a = transition diameter; d s = shank diameter; d w = bearing-face diameter; e = width across corners; k = head height; k 1 = head-bearing check height; L 1 = min grip length adder; r = fillet radius; s = width across flats; b 1/b 2/b 3 = the 'Length of Thread b' summary rows the source reprints. '/' where the source does not tabulate the cell; '-' where a regime does not apply. The collected page states the standard replaces DIN 960.
Attribute	(M22)	M24	M27
P — Pitch	1.5	2	2
b — L≤125	50	54	60
125＜L≤200	56	60	66
L＞200	69	73	79
c — max	0.8	0.8	0.8
min	0.2	0.2	0.2
d a — max	24.4	26.4	30.4
d s — max=nominal size	22	24	27
Grade A — min	21.67	23.67	/
Grade B — min	21.48	23.48	26.48
d w — Grade A — min	31.71	33.61	/
Grade B — min	31.35	33.25	38
e — Grade A — min	37.72	39.98	/
Grade B — min	37.29	39.55	45.2
k — Nominal Size	14	15	17
Grade A — max	14.215	15.215	/
min	13.785	14.785	/
Grade B — max	14.35	15.35	17.35
min	13.65	14.65	16.65
k 1 — Grade A — min	9.65	10.35	/
Grade B — min	9.56	10.26	11.66
L 1 — max	4	4	6
r — min	0.8	0.8	1
s — max=nominal size	34	36	41
Grade A — min	33.38	35.38	/
Grade B — min	33	35	40
Length of Thread b — b 1	50	54	60
b 2	56	60	66
b 3	69	73	79

ISO 8765 hex head bolts (fine pitch) - per-size dimensions (M30 - M36)All dimensions in millimeters. Attribute labels follow the source: P = thread pitch; b = thread length in the three length regimes (L≤125 / 125<L≤200 / L>200) as printed; c = chamfer height; d a = transition diameter; d s = shank diameter; d w = bearing-face diameter; e = width across corners; k = head height; k 1 = head-bearing check height; L 1 = min grip length adder; r = fillet radius; s = width across flats; b 1/b 2/b 3 = the 'Length of Thread b' summary rows the source reprints. '/' where the source does not tabulate the cell; '-' where a regime does not apply. The collected page states the standard replaces DIN 960.
Attribute	M30	M33	M36
P — Pitch	2	2	3
b — L≤125	66	72	/
125＜L≤200	72	78	84
L＞200	85	91	97
c — max	0.8	0.8	0.8
min	0.2	0.2	0.2
d a — max	33.4	36.4	39.4
d s — max=nominal size	30	33	36
Grade A — min	/	/	/
Grade B — min	29.48	32.38	35.38
d w — Grade A — min	/	/	/
Grade B — min	42.75	46.55	51.11
e — Grade A — min	/	/	/
Grade B — min	50.85	55.37	60.79
k — Nominal Size	18.7	21	22.5
Grade A — max	/	/	/
min	/	/	/
Grade B — max	19.12	21.42	22.92
min	18.28	20.58	22.08
k 1 — Grade A — min	/	/	/
Grade B — min	12.8	14.41	15.46
L 1 — max	6	6	6
r — min	1	1	1
s — max=nominal size	46	50	55
Grade A — min	/	/	/
Grade B — min	45	49	53.8
Length of Thread b — b 1	66	72	78
b 2	72	78	84
b 3	85	91	97

ISO 8765 hex head bolts (fine pitch) - per-size dimensions (M39 - M45)All dimensions in millimeters. Attribute labels follow the source: P = thread pitch; b = thread length in the three length regimes (L≤125 / 125<L≤200 / L>200) as printed; c = chamfer height; d a = transition diameter; d s = shank diameter; d w = bearing-face diameter; e = width across corners; k = head height; k 1 = head-bearing check height; L 1 = min grip length adder; r = fillet radius; s = width across flats; b 1/b 2/b 3 = the 'Length of Thread b' summary rows the source reprints. '/' where the source does not tabulate the cell; '-' where a regime does not apply. The collected page states the standard replaces DIN 960.
Attribute	M39	M42	M45
P — Pitch	3	3	3
b — L≤125	/	/	/
125＜L≤200	90	96	102
L＞200	103	109	115
c — max	1	1	1
min	0.3	0.3	0.3
d a — max	42.4	45.6	48.6
d s — max=nominal size	39	42	45
Grade A — min	/	/	/
Grade B — min	38.38	41.38	44.38
d w — Grade A — min	/	/	/
Grade B — min	55.86	59.95	64.7
e — Grade A — min	/	/	/
Grade B — min	66.44	71.3	76.95
k — Nominal Size	25	26	28
Grade A — max	/	/	/
min	/	/	/
Grade B — max	25.42	26.42	28.42
min	24.58	25.58	27.58
k 1 — Grade A — min	/	/	/
Grade B — min	17.21	17.91	19.31
L 1 — max	6	8	8
r — min	1	1.2	1.2
s — max=nominal size	60	65	70
Grade A — min	/	/	/
Grade B — min	58.8	63.1	68.1
Length of Thread b — b 1	84	90	96
b 2	90	96	102
b 3	103	109	115

ISO 8765 hex head bolts (fine pitch) - per-size dimensions (M48 - M56)All dimensions in millimeters. Attribute labels follow the source: P = thread pitch; b = thread length in the three length regimes (L≤125 / 125<L≤200 / L>200) as printed; c = chamfer height; d a = transition diameter; d s = shank diameter; d w = bearing-face diameter; e = width across corners; k = head height; k 1 = head-bearing check height; L 1 = min grip length adder; r = fillet radius; s = width across flats; b 1/b 2/b 3 = the 'Length of Thread b' summary rows the source reprints. '/' where the source does not tabulate the cell; '-' where a regime does not apply. The collected page states the standard replaces DIN 960.
Attribute	M48	M52	M56
P — Pitch	3	4	4
b — L≤125	/	/	/
125＜L≤200	108	116	/
L＞200	121	129	137
c — max	1	1	1
min	0.3	0.3	0.3
d a — max	52.6	56.6	63
d s — max=nominal size	48	52	56
Grade A — min	/	/	/
Grade B — min	47.38	51.26	55.26
d w — Grade A — min	/	/	/
Grade B — min	69.45	74.2	78.66
e — Grade A — min	/	/	/
Grade B — min	82.6	88.25	93.56
k — Nominal Size	30	33	35
Grade A — max	/	/	/
min	/	/	/
Grade B — max	30.42	33.5	35.5
min	29.58	32.5	34.5
k 1 — Grade A — min	/	/	/
Grade B — min	20.71	22.75	24.15
L 1 — max	10	10	12
r — min	1.6	1.6	2
s — max=nominal size	75	80	85
Grade A — min	/	/	/
Grade B — min	73.1	78.1	82.8
Length of Thread b — b 1	102	-	-
b 2	108	116	124
b 3	121	129	137

ISO 8765 hex head bolts (fine pitch) - per-size dimensions (M60 - M64)All dimensions in millimeters. Attribute labels follow the source: P = thread pitch; b = thread length in the three length regimes (L≤125 / 125<L≤200 / L>200) as printed; c = chamfer height; d a = transition diameter; d s = shank diameter; d w = bearing-face diameter; e = width across corners; k = head height; k 1 = head-bearing check height; L 1 = min grip length adder; r = fillet radius; s = width across flats; b 1/b 2/b 3 = the 'Length of Thread b' summary rows the source reprints. '/' where the source does not tabulate the cell; '-' where a regime does not apply. The collected page states the standard replaces DIN 960.
Attribute	M60	M64
P — Pitch	4	4
b — L≤125	/	/
125＜L≤200	/	/
L＞200	145	153
c — max	1	1
min	0.3	0.3
d a — max	67	71
d s — max=nominal size	60	64
Grade A — min	/	/
Grade B — min	59.26	63.26
d w — Grade A — min	/	/
Grade B — min	83.41	88.16
e — Grade A — min	/	/
Grade B — min	99.21	104.86
k — Nominal Size	38	40
Grade A — max	/	/
min	/	/
Grade B — max	38.5	40.5
min	37.5	39.5
k 1 — Grade A — min	/	/
Grade B — min	26.25	27.65
L 1 — max	12	13
r — min	2	2
s — max=nominal size	90	95
Grade A — min	/	/
Grade B — min	87.8	92.8
Length of Thread b — b 1	-	-
b 2	132	140
b 3	145	153

Materials

Material and property class specified per RFQ — name diameter and pitch together 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 (ISO 8765 Hex Head Bolts (Fine Pitch)) 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 ISO 8765 fine pitch over a coarse ISO 4014 bolt?

For the thread, not the head — the hex envelope (d w, e, k, s) matches the coarse series size for size, so your wrenches and housing seats do not change. What changes is the helix. A fine pitch gives the same clamp from lower torque, holds adjustment with finer increments, resists vibration walk-off because each turn advances less, and fits more engaged turns into a short boss — which is why fine-pitch bolts dominate on hydraulic ends, engine hardware, mould bases and thin-walled housings. The cost is assembly discipline: fine threads galle more on stainless and high-strength steels, so lubricant or pitch-specific torque values matter, and a mixed-pitch thread is the classic assembly error — the collected tables deliberately repeat each diameter per pitch (M10 at 1.25 and 1), so read the P row and order "M10×1", never "fine M10". Thread length follows the b ladder tabulated per size across the three length regimes; confirm your grip length against it before ordering.

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

ISO 8765 Hex Head Bolts (Fine Pitch)

Specifications

Materials

Ordering & documentation

Documents

Quotation

Sample & supply

Storage & shipping

Frequently asked questions

Why choose ISO 8765 fine pitch over a coarse ISO 4014 bolt?

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