DIN 960 Hex Bolts (Fine Pitch, Partially Threaded)

Partially threaded hexagon head bolts with fine-pitch thread per DIN 960 — nine size-block grids covering M8 to M100, with one or two fine pitch selections per size, thread-length bands L≤125 / 125＜L≤200 / L＞200 and product grades A/B tolerance rows. Fine-pitch counterpart of DIN 931; ISO successor designation: ISO 8765.

Last updated: 2026-11

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DIN 960 Hex Bolts (Fine Pitch, Partially Threaded) in an industrial setting — Illustrative image redrawn from real product references — not a photograph of stocked items.

Specifications

DIN 960 is the fine-pitch member of the DIN hex-bolt pair: the same hexagon head geometry buyers know from DIN 931, but with a reduced-pitch thread and a defined unthreaded shank between head and thread. Fine pitch is chosen for a reason, and the collected tables show the mechanics of it: each size block carries a fine thread-1 pitch row and, where the size has one, a fine thread-2 row (M8 carries a single fine pitch of 1; M10 and M12 run 1 / 1.25 and 1.5 / 1.25; M20 runs 1.5 / 2; the largest blocks M80 - M100 tabulate a single fine pitch of 4). A finer pitch buys adjustment sensitivity and thin-nut engagement on tapped parts, vibration resistance from the shallower helix, and higher effective tensile stress area than the coarse thread of the same diameter — at the cost of easier thread damage and a stricter cleanliness discipline during assembly. The thread-length bands (L≤125, 125＜L≤200, L＞200) make the shank a sized feature: the bolt must be selected so the thread runout falls outside the grip, exactly as with its coarse-pitch counterpart. The grids print Grade A and Grade B min rows (tolerance classes, not strength), and many Grade A cells in the largest blocks print "-" — carried verbatim from the source, meaning the value is not tabulated there. Strength grades, proof loads and finish are not tabulated on this page — per RFQ.

Standard	DIN 960 — hexagon head bolts, fine-pitch thread, partially threaded; size blocks M8 - M100
Thread	Fine pitch selections per size as printed (fine thread-1 / fine thread-2): e.g. M8 1 / -, M10 1 / 1.25, M12 1.5 / 1.25, M20 1.5 / 2, M36 3 / -, M80 - M100 a single fine pitch of 4
Thread-length bands	b for L≤125, 125＜L≤200 and L＞200, tabulated per size (e.g. M12: 30 / 36 / 49; M100: - / - / 225 — the L≤125 row is empty from M56 up, as printed)
Product grades	A and B tolerance rows in the grids (da, ds, dw, e, k, s carry Grade A / Grade B min pairs where tabulated); tolerance class, not strength — property class per RFQ
Head geometry (anchor sizes from the collected tables)	Width across flats s max = nominal size (M12: 18, M20: 30, M36: 55, M100: 145); head height k nominal (M12: 7.5, M20: 12.5, M36: 22.5, M100: 63); e min Grade B (M12: 20.88, M36: 60.79, M100: 161.03)
Series extent	Non-preferred sizes print in parentheses in the grid headers, as on the source: (M14), (M18), (M22), (M27), (M39), (M45), (M52), (M60), (M68), (M76)
Counterpart / successor	Fine-pitch counterpart of DIN 931 (coarse DIN pair); ISO successor designation ISO 8765 — read the drawing before substituting between designations
Not tabulated	Strength grades (ISO 898-1 classes), proof loads, materials, finish — per RFQ

DIN 960 hexagon head bolts, fine-pitch thread — M8 / M10 / M12 (block 1 of 9)Dimensions per the collected page: size blocks of three thread sizes each (M8 - M100). Rows: P (pitch, fine thread-1 / fine thread-2), thread length b (L≤125 / 125＜L≤200 / L＞200), c min/max, da max, ds max + Grade A/B min, dw Grade A/B min, e Grade A/B min, k Nominal Size + Grade A/B min/max, k1 min, r min, s max=nominal size + Grade A/B min. The two-row label column is the source's rowspan layout, carried as separate leading cells with the spanned cells empty. All dimensions in mm as printed. Verification: fetched from the live page 2026-11-02, token-for-token equal to the live-DOM extraction.
Screw Thread d			M8	M10	M12
P	Pitch	Fine thread-1	1	1	1.5
		Fine thread-2	-	1.25	1.25
Length of Thread b	L≤125		22	26	30
	125＜L≤200		28	32	36
	L＞200		41	45	49
c	min		0.15	0.15	0.15
	max		0.6	0.6	0.6
da	max		9.2	11.2	13.7
ds	max		8	10	12
	Grade A	min	7.78	9.78	11.73
	Grade B	min	7.64	9.64	11.57
dw	Grade A	min	11.6	15.6	17.4
	Grade B	min	11.4	15.4	17.2
e	Grade A	min	14.38	18.9	21.1
	Grade B	min	14.2	18.72	20.88
k	Nominal Size		5.3	6.4	7.5
	Grade A	min	5.15	6.22	7.32
		max	5.45	6.58	7.68
	Grade B	min	5.06	6.11	7.21
		max	5.54	6.69	7.79
k1	min		3.54	4.28	5.05
r	min		0.4	0.4	0.6
s	max=nominal size		13	17	19
	Grade A	min	12.73	16.73	18.67
	Grade B	min	12.57	16.57	18.48

Row 4 (): Thread-length bounds print full-width comparison characters ('125＜L≤200', 'L＞200') as on the source page, carried verbatim.
Cells print '-' where the source tabulates no value ('Fine thread-2' rows affected); '-' carried verbatim, not read as zero or blank.

DIN 960 hexagon head bolts, fine-pitch thread — (M14) / M16 / (M18) (block 2 of 9)Dimensions per the collected page: size blocks of three thread sizes each (M8 - M100). Rows: P (pitch, fine thread-1 / fine thread-2), thread length b (L≤125 / 125＜L≤200 / L＞200), c min/max, da max, ds max + Grade A/B min, dw Grade A/B min, e Grade A/B min, k Nominal Size + Grade A/B min/max, k1 min, r min, s max=nominal size + Grade A/B min. The two-row label column is the source's rowspan layout, carried as separate leading cells with the spanned cells empty. All dimensions in mm as printed. Verification: fetched from the live page 2026-11-02, token-for-token equal to the live-DOM extraction.
Screw Thread d			(M14)	M16	(M18)
P	Pitch	Fine thread-1	1.5	1.5	2
		Fine thread-2	-	-	1.5
Length of Thread b	L≤125		34	38	42
	125＜L≤200		40	44	48
	L＞200		53	57	61
c	min		0.15	0.2	0.2
	max		0.6	0.8	0.8
da	max		15.7	17.7	20.2
ds	max		14	16	18
	Grade A	min	13.73	15.73	17.73
	Grade B	min	13.57	15.57	17.57
dw	Grade A	min	20.5	22.5	25.3
	Grade B	min	20.1	22	24.8
e	Grade A	min	24.49	26.75	30.14
	Grade B	min	23.91	26.17	29.56
k	Nominal Size		8.8	10	11.5
	Grade A	min	8.62	9.82	11.28
		max	8.98	10.18	11.72
	Grade B	min	8.51	9.71	11.15
		max	9.09	10.29	11.85
k1	min		5.96	6.8	7.8
r	min		0.6	0.6	0.6
s	max=nominal size		22	24	27
	Grade A	min	21.67	23.67	26.67
	Grade B	min	21.16	23.16	26.16

Row 4 (): Thread-length bounds print full-width comparison characters ('125＜L≤200', 'L＞200') as on the source page, carried verbatim.
Cells print '-' where the source tabulates no value ('Fine thread-2' rows affected); '-' carried verbatim, not read as zero or blank.

DIN 960 hexagon head bolts, fine-pitch thread — M20 / (M22) / M24 (block 3 of 9)Dimensions per the collected page: size blocks of three thread sizes each (M8 - M100). Rows: P (pitch, fine thread-1 / fine thread-2), thread length b (L≤125 / 125＜L≤200 / L＞200), c min/max, da max, ds max + Grade A/B min, dw Grade A/B min, e Grade A/B min, k Nominal Size + Grade A/B min/max, k1 min, r min, s max=nominal size + Grade A/B min. The two-row label column is the source's rowspan layout, carried as separate leading cells with the spanned cells empty. All dimensions in mm as printed. Verification: fetched from the live page 2026-11-02, token-for-token equal to the live-DOM extraction.
Screw Thread d			M20	(M22)	M24
P	Pitch	Fine thread-1	1.5	2	2
		Fine thread-2	2	1.5	1.5
Length of Thread b	L≤125		46	50	54
	125＜L≤200		52	56	60
	L＞200		65	69	73
c	min		0.2	0.2	0.2
	max		0.8	0.8	0.8
da	max		22.4	24.4	26.4
ds	max		20	22	24
	Grade A	min	19.67	21.67	23.67
	Grade B	min	19.48	21.48	23.48
dw	Grade A	min	28.2	30	33.6
	Grade B	min	27.7	29.5	33.2
e	Grade A	min	33.53	35.72	39.98
	Grade B	min	32.95	35.03	39.55
k	Nominal Size		12.5	14	15
	Grade A	min	12.28	13.78	14.78
		max	12.72	14.22	15.22
	Grade B	min	12.15	13.65	14.65
		max	12.85	14.35	15.35
k1	min		8.5	9.6	10.3
r	min		0.8	0.8	0.8
s	max=nominal size		30	32	36
	Grade A	min	29.67	31.61	35.38
	Grade B	min	29.16	31	35

Row 4 (): Thread-length bounds print full-width comparison characters ('125＜L≤200', 'L＞200') as on the source page, carried verbatim.

DIN 960 hexagon head bolts, fine-pitch thread — (M27) / M30 / (M33) (block 4 of 9)Dimensions per the collected page: size blocks of three thread sizes each (M8 - M100). Rows: P (pitch, fine thread-1 / fine thread-2), thread length b (L≤125 / 125＜L≤200 / L＞200), c min/max, da max, ds max + Grade A/B min, dw Grade A/B min, e Grade A/B min, k Nominal Size + Grade A/B min/max, k1 min, r min, s max=nominal size + Grade A/B min. The two-row label column is the source's rowspan layout, carried as separate leading cells with the spanned cells empty. All dimensions in mm as printed. Verification: fetched from the live page 2026-11-02, token-for-token equal to the live-DOM extraction.
Screw Thread d			(M27)	M30	(M33)
P	Pitch	Fine thread-1	2	2	2
		Fine thread-2	-	-	-
Length of Thread b	L≤125		60	66	72
	125＜L≤200		66	72	78
	L＞200		79	85	91
c	min		0.2	0.2	0.2
	max		0.8	0.8	0.8
da	max		30.4	33.4	36.4
ds	max		27	30	33
	Grade A	min	-	-	-
	Grade B	min	26.48	29.48	32.38
dw	Grade A	min	-	-	-
	Grade B	min	38	42.7	46.6
e	Grade A	min	-	-	-
	Grade B	min	45.2	50.85	55.37
k	Nominal Size		17	18.7	21
	Grade A	min	-	-	-
		max	-	-	-
	Grade B	min	16.65	18.28	20.58
		max	17.35	19.12	21.42
k1	min		11.7	12.8	14.4
r	min		1	1	1
s	max=nominal size		41	46	50
	Grade A	min	-	-	-
	Grade B	min	40	45	49

Row 4 (): Thread-length bounds print full-width comparison characters ('125＜L≤200', 'L＞200') as on the source page, carried verbatim.
Cells print '-' where the source tabulates no value ('Fine thread-2', 'Grade A', 'dw', 'e', 'max' rows affected); '-' carried verbatim, not read as zero or blank.

DIN 960 hexagon head bolts, fine-pitch thread — M36 / (M39) / M42 (block 5 of 9)Dimensions per the collected page: size blocks of three thread sizes each (M8 - M100). Rows: P (pitch, fine thread-1 / fine thread-2), thread length b (L≤125 / 125＜L≤200 / L＞200), c min/max, da max, ds max + Grade A/B min, dw Grade A/B min, e Grade A/B min, k Nominal Size + Grade A/B min/max, k1 min, r min, s max=nominal size + Grade A/B min. The two-row label column is the source's rowspan layout, carried as separate leading cells with the spanned cells empty. All dimensions in mm as printed. Verification: fetched from the live page 2026-11-02, token-for-token equal to the live-DOM extraction.
Screw Thread d			M36	(M39)	M42
P	Pitch	Fine thread-1	3	3	3
		Fine thread-2	-	-	-
Length of Thread b	L≤125		78	84	90
	125＜L≤200		84	90	96
	L＞200		97	103	109
c	min		0.2	0.3	0.3
	max		0.8	1	1
da	max		39.4	42.4	45.6
ds	max		36	39	42
	Grade A	min	-	-	-
	Grade B	min	35.38	38.38	41.38
dw	Grade A	min	-	-	-
	Grade B	min	51.1	55.9	59.9
e	Grade A	min	-	-	-
	Grade B	min	60.79	66.44	71.3
k	Nominal Size		22.5	25	26
	Grade A	min	-	-	-
		max	-	-	-
	Grade B	min	22.08	24.58	25.58
		max	22.92	25.42	26.42
k1	min		15.5	17.2	17.9
r	min		1	1	1.2
s	max=nominal size		55	60	65
	Grade A	min	-	-	-
	Grade B	min	53.8	58.8	63.1

Row 4 (): Thread-length bounds print full-width comparison characters ('125＜L≤200', 'L＞200') as on the source page, carried verbatim.
Cells print '-' where the source tabulates no value ('Fine thread-2', 'Grade A', 'dw', 'e', 'max' rows affected); '-' carried verbatim, not read as zero or blank.

DIN 960 hexagon head bolts, fine-pitch thread — (M45) / M48 / (M52) (block 6 of 9)Dimensions per the collected page: size blocks of three thread sizes each (M8 - M100). Rows: P (pitch, fine thread-1 / fine thread-2), thread length b (L≤125 / 125＜L≤200 / L＞200), c min/max, da max, ds max + Grade A/B min, dw Grade A/B min, e Grade A/B min, k Nominal Size + Grade A/B min/max, k1 min, r min, s max=nominal size + Grade A/B min. The two-row label column is the source's rowspan layout, carried as separate leading cells with the spanned cells empty. All dimensions in mm as printed. Verification: fetched from the live page 2026-11-02, token-for-token equal to the live-DOM extraction.
Screw Thread d			(M45)	M48	(M52)
P	Pitch	Fine thread-1	3	3	3
		Fine thread-2	-	-	-
Length of Thread b	L≤125		96	102	-
	125＜L≤200		102	108	116
	L＞200		115	121	129
c	min		0.3	0.3	0.3
	max		1	1	1
da	max		48.6	52.6	56.6
ds	max		45	48	52
	Grade A	min	-	-	-
	Grade B	min	44.38	47.38	51.26
dw	Grade A	min	-	-	-
	Grade B	min	64.7	69.4	74.2
e	Grade A	min	-	-	-
	Grade B	min	76.95	82.6	88.25
k	Nominal Size		28	30	33
	Grade A	min	-	-	-
		max	-	-	-
	Grade B	min	27.58	29.58	32.5
		max	28.42	30.42	33.5
k1	min		19.3	20.9	22.8
r	min		1.2	1.6	1.6
s	max=nominal size		70	75	80
	Grade A	min	-	-	-
	Grade B	min	68.1	73.1	78.1

Row 4 (): Thread-length bounds print full-width comparison characters ('125＜L≤200', 'L＞200') as on the source page, carried verbatim.
Cells print '-' where the source tabulates no value ('Fine thread-2', 'Length of Thread b', 'Grade A', 'dw', 'e', 'max' rows affected); '-' carried verbatim, not read as zero or blank.

DIN 960 hexagon head bolts, fine-pitch thread — M56 / (M60) / M64 (block 7 of 9)Dimensions per the collected page: size blocks of three thread sizes each (M8 - M100). Rows: P (pitch, fine thread-1 / fine thread-2), thread length b (L≤125 / 125＜L≤200 / L＞200), c min/max, da max, ds max + Grade A/B min, dw Grade A/B min, e Grade A/B min, k Nominal Size + Grade A/B min/max, k1 min, r min, s max=nominal size + Grade A/B min. The two-row label column is the source's rowspan layout, carried as separate leading cells with the spanned cells empty. All dimensions in mm as printed. Verification: fetched from the live page 2026-11-02, token-for-token equal to the live-DOM extraction.
Screw Thread d			M56	(M60)	M64
P	Pitch	Fine thread-1	4	4	4
		Fine thread-2	-	-	-
Length of Thread b	L≤125		-	-	-
	125＜L≤200		124	132	140
	L＞200		137	145	153
c	min		-	-	-
	max		1	1	1
da	max		63	67	71
ds	max		56	60	64
	Grade A	min	-	-	-
	Grade B	min	55.26	59.26	63.26
dw	Grade A	min	-	-	-
	Grade B	min	78.7	83.4	88.2
e	Grade A	min	-	-	-
	Grade B	min	93.56	99.21	104.86
k	Nominal Size		35	38	40
	Grade A	min	-	-	-
		max	-	-	-
	Grade B	min	34.5	37.5	39.5
		max	35.5	38.5	40.5
k1	min		24.2	26.2	27.6
r	min		2	2	2
s	max=nominal size		85	90	95
	Grade A	min	-	-	-
	Grade B	min	82.8	87.8	92.8

Row 4 (): Thread-length bounds print full-width comparison characters ('125＜L≤200', 'L＞200') as on the source page, carried verbatim.
Cells print '-' where the source tabulates no value ('Fine thread-2', 'Length of Thread b', 'c', 'Grade A', 'dw', 'e', 'max' rows affected); '-' carried verbatim, not read as zero or blank.

DIN 960 hexagon head bolts, fine-pitch thread — (M68) / M72 / (M76) (block 8 of 9)Dimensions per the collected page: size blocks of three thread sizes each (M8 - M100). Rows: P (pitch, fine thread-1 / fine thread-2), thread length b (L≤125 / 125＜L≤200 / L＞200), c min/max, da max, ds max + Grade A/B min, dw Grade A/B min, e Grade A/B min, k Nominal Size + Grade A/B min/max, k1 min, r min, s max=nominal size + Grade A/B min. The two-row label column is the source's rowspan layout, carried as separate leading cells with the spanned cells empty. All dimensions in mm as printed. Verification: fetched from the live page 2026-11-02, token-for-token equal to the live-DOM extraction.
Screw Thread d			(M68)	M72	(M76)
P	Pitch	Fine thread-1	4	4	4
		Fine thread-2	-	-	-
Length of Thread b	L≤125		-	-	-
	125＜L≤200		148	158	164
	L＞200		161	169	177
c	min		-	-	-
	max		1	1	1
da	max		75	79	83
ds	max		68	72	76
	Grade A	min	-	-	-
	Grade B	min	67.26	71.26	75.26
dw	Grade A	min	-	-	-
	Grade B	min	92.9	97.7	102.4
e	Grade A	min	-	-	-
	Grade B	min	110.51	116.16	121.81
k	Nominal Size		43	45	48
	Grade A	min	-	-	-
		max	-	-	-
	Grade B	min	42.5	44.5	47.5
		max	43.5	45.5	48.5
k1	min		29.8	31.2	33.2
r	min		2	2	2
s	max=nominal size		100	105	110
	Grade A	min	-	-	-
	Grade B	min	97.8	102.8	107.8

Row 4 (): Thread-length bounds print full-width comparison characters ('125＜L≤200', 'L＞200') as on the source page, carried verbatim.
Cells print '-' where the source tabulates no value ('Fine thread-2', 'Length of Thread b', 'c', 'Grade A', 'dw', 'e', 'max' rows affected); '-' carried verbatim, not read as zero or blank.

DIN 960 hexagon head bolts, fine-pitch thread — M80 / M90 / M100 (block 9 of 9)Dimensions per the collected page: size blocks of three thread sizes each (M8 - M100). Rows: P (pitch, fine thread-1 / fine thread-2), thread length b (L≤125 / 125＜L≤200 / L＞200), c min/max, da max, ds max + Grade A/B min, dw Grade A/B min, e Grade A/B min, k Nominal Size + Grade A/B min/max, k1 min, r min, s max=nominal size + Grade A/B min. The two-row label column is the source's rowspan layout, carried as separate leading cells with the spanned cells empty. All dimensions in mm as printed. Verification: fetched from the live page 2026-11-02, token-for-token equal to the live-DOM extraction.
Screw Thread d			M80	M90	M100
P	Pitch	Fine thread-1	4	4	4
		Fine thread-2	-	-	-
Length of Thread b	L≤125		-	-	-
	125＜L≤200		172	192	-
	L＞200		185	205	225
c	min		-	-	-
	max		2	2	2
da	max		87	97	108
ds	max		80	90	100
	Grade A	min	-	-	-
	Grade B	min	79.26	89.13	99.13
dw	Grade A	min	-	-	-
	Grade B	min	107.2	121.1	135.4
e	Grade A	min	-	-	-
	Grade B	min	127.46	144.08	161.03
k	Nominal Size		50	57	63
	Grade A	min	-	-	-
		max	-	-	-
	Grade B	min	49.5	56.4	62.4
		max	50.5	57.6	63.6
k1	min		34.6	39.5	43.7
r	min		2	2.5	2.5
s	max=nominal size		115	130	145
	Grade A	min	-	-	-
	Grade B	min	112.8	127.5	142.5

Row 4 (): Thread-length bounds print full-width comparison characters ('125＜L≤200', 'L＞200') as on the source page, carried verbatim.
Cells print '-' where the source tabulates no value ('Fine thread-2', 'Length of Thread b', '125＜L≤200', 'c', 'Grade A', 'dw', 'e', 'max' rows affected); '-' carried verbatim, not read as zero or blank.

Materials

Fine-pitch hex bolts ship in the same material spectrum as the coarse series — carbon steel by property class and stainless A2/A4. The dimensions tabulated here are material-independent; state pitch explicitly on the RFQ (a fine pitch left unspecified is the single most common fulfillment error on this family)

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 960 Hex Bolts (Fine Pitch, Partially Threaded)) 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

Which fine pitch do I order when a DIN 960 size lists two selections?

The one on the drawing — that is exactly why the grids carry both a fine thread-1 and a fine thread-2 row. Two selections exist only where the second row prints a value: M10 (1 / 1.25), M12 (1.5 / 1.25), M18 (2 / 1.5) and the M20 - M24 block (1.5 / 2, 2 / 1.5, 2 / 1.5 — note the ordering swaps per size, as printed). Every other size carries a single fine pitch — 1 at M8, rising through 1.5, 2 and 3 to 4 across the largest blocks — with the fine thread-2 row printing "-". A nut bought for the wrong selection threads on by one or two turns and then binds, and no amount of torque fixes a pitch mismatch — state "DIN 960 M20 × 1.5" on the RFQ, diameter and pitch together, the way the tables print them.

What do the parentheses in the size headers and the "-" cells mean?

Both are the source's own markings, carried verbatim. Parentheses around a size — (M14), (M18), (M22), (M27), (M39), (M45), (M52), (M60), (M68), (M76) — mark the non-preferred sizes of the ladder; they are manufactured and quoted, but a drawing that does not force them should first consider the preferred neighbours. The "-" cells mean the value is not tabulated at that position: Grade A minimums disappear across the largest blocks (M80 - M100 rows for ds, dw, e, k and s print Grade B only), and the L≤125 thread length row is empty from M56 up — even the 125＜L≤200 band prints "-" for M100. Read "-" as "ask, don't assume" — quote the size and pitch on the RFQ and we confirm the tabulated geometry before quoting.

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✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
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DIN 960 Hex Bolts (Fine Pitch, Partially Threaded)

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Frequently asked questions

Which fine pitch do I order when a DIN 960 size lists two selections?

What do the parentheses in the size headers and the "-" cells mean?

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