Proof Loads for Fasteners

Proof Loads For Screws
ISO Metric (Coarse) Threads ISO 898/I-1988

Nominal Diameter Of Thread d(mm)	Pitch P(mm)	Nomincal Stress Area As (mm2)	Property Class
			3.6	4.6	4.8	5.6	5.8	6.8	8.8	9.8	10.9	12.9
			Proof Load (As . Ap),N
3	0.50	5.03	910	1130	1560	1410	1910	2210	2920	3270	4180	4880
3.5	0.60	6.78	1220	1530	2100	1900	2580	2980	3940	4410	5630	6580
4	0.70	8.78	1580	1980	2770	2460	3340	3860	5100	5710	7290	8520
5	0.80	14.20	2560	3200	4400	3980	5400	6250	8230	9230	11800	13800
6	1.00	20.10	3620	4520	6230	5630	7640	8840	11600	13100	16700	19500
7	1.00	28.90	5200	6500	8920	8090	11000	12700	16800	18800	24000	28000
8	1.25	36.60	6590	8240	11400	10200	13900	16100	21200	23800	30400	35500
10	1.50	58.00	10400	13000	18000	16200	22000	25500	33700	37700	48100	56300
12	1.75	84.30	15200	19000	26100	23600	32000	37100	48900¹⁾	54800	70000	81800
14	2.00	115	20700	25900	35600	32200	43700	50600	66700¹⁾	74800	95500	112000
16	2.00	157	28300	35300	48700	44000	59700	69100	91000¹⁾	102000	130000	152000
18	2.50	192	34600	43200	59500	53800	73000	84500	11500		159000	186000
20	2.50	245	44100	55100	76000	68600	93100	108000	147000		203000	238000
22	2.50	303	54500	68200	93900	84800	115000	133000	182000		252000	294000
24	3.00	353	63500	79400	109000	98800	134000	155000	212000		293000	342000
27	3.00	459	82600	103000	142000	128000	174000	202000	275000		381000	445000
30	3.50	561	101000	126000	174000	157000	213000	247000	337000		466000	544000
33	3.50	694	125000	156000	215000	194000	264000	305000	416000		570000	673000
36	4.00	817	147000	184000	253000	229000	310000	359000	490000		678000	792000
39	4.00	976	176000	220000	303000	273000	371000	429000	586000		810000	947000

1)For structural steel screws 50700,68800 and 94500 N

Proof Loads For Screws
ISO Metric (Fine) Threads ISO 898/I-1988

Nominal Diameter Of Thread d(mm)	Pitch P(mm)	Nomincal Stress Area As (mm2)	Property Class
			3.6	4.6	4.8	5.6	5.8	6.8	8.8	9.8	10.9	12.9
			Proof Load (As . Ap),N
8	1.00	39.2	7060	8820	12200	11000	14900	17200	22700	25500	32500	38000
10	1.25	61.2	11000	13800	19000	17100	23300	26900	33500	39800	50800	59400
12	1.25	92.1	16600	20700	28600	25800	35000	40500	53400	59900	76300	89300
14	1.50	125	22500	28100	38800	35000	47500	55000	72500	81200	104000	121000
16	1.50	167	30100	27600	51800	46800	63500	73500	96900	109000	139000	162000
18	1.50	216	38900	48600	67000	60500	82100	95000	130000		179000	210000
20	1.50	272	49000	61200	84300	76200	103000	120000	163000		226000	264000
22	1.50	333	59900	74900	103000	93200	126000	146000	200000		276000	323000
24	2.00	384	69100	86400	119000	108000	146000	169000	230000		319000	372000
27	2.00	496	89300	112000	154000	139000	188000	218000	298000		412000	481000
30	2.00	621	112000	140000	192000	171000	236000	273000	373000		515000	602000
33	2.00	761	137000	171000	236000	213000	289000	335000	457000		632000	738000
36	3.00	865	156000	195000	268000	242000	329000	381000	519000		718000	838000
39	3.00	1030	185000	232000	319000	288000	391000	453000	618000		855000	999000

Proof Loads For Nuts (Coarse Thread)
According to DIN 934 and DIN 985 (Ref. DIN 267/4)

Thread Size	Pitch P(mm)	Nominal Stress Area of Test Mandrel As mm²	Property Class
			4	5	6	8	10	12
			Proof Load (As * S_p), in N
M3	0.50	5.03		2500	3000	4000	5000	6000
M3.5	0.60	6.78		3400	4050	5400	6800	8150
M4	0.70	8.78		4400	5250	7000	8750	10500
M5	0.80	14.2		7100	8500	11400	11400	17000
M6	1.00	20.1		10000	12000	16000	20000	24000
M7	1.00	28.9		14500	17300	23000	29000	34700
M8	1.25	36.6		18300	22000	29000	36500	43000
M10	1.50	58.0		29000	35000	46000	58000	69500
M12	1.75	84.5		42100	50500	67000	84000	100000
M14	2.00	115		57500	69000	92000	115000	138000
M16	2.00	157		78500	94000	126000	157000	188000
M18	2.50	192	76800	96000	115000	154000	192000	230000
M20	2.50	245	98000	122000	147000	196000	245000	294000
M22	2.50	303	121000	151000	182000	242000	303000	364000
M24	3.00	353	141000	176000	212000	282000	353000	423000
M27	3.00	459	184000	230000	276000	367000	459000	550000
M30	3.50	561	224000	280000	336000	448000	561000	673000
M33	3.50	694	277000	347000	416000	555000	694000	833000
M36	4.00	817	327000	408000	490000	653000	817000	980000
M39	4.00	976	390000	488000	585000	780000	976000	1170000

The above proof loads are also valid for nuts where the property class marking is enclosed by two vertical lines |8|
Conversion Factor: 1N = 0.2248 lb.

Proof Loads For Nuts (Fine Thread)
According to DIN 934 and DIN 985 (Ref. DIN 267/4)

Thread Size	Pitch P(mm)	Nominal Stress Area of Test Mandrel As mm²	Property Class
			5	6	8	10	12
			Proof Load (As * S_p), in N
M8	1.00	39.2	19600	23500	31000	39000	47000
M10	1.00	64.5	32200	38700	51500	64500	77500
M10	1.25	61.2	30600	37000	49000	61000	73500
M12	1.25	92.1	46000	55000	74000	92000	110000
M12	1.50	88.1	44000	53000	70000	88000	106000
M14	1.50	125	62200	75000	100000	125000	150000
M16	1.50	167	83500	100000	134000	167000	200000
M18	1.50	216	108000	129000	173000	216000	259000
M18	2.00	204	102000	122000	163000	204000	245000
M20	1.50	272	136000	163000	218000	272000	326000
M20	2.00	258	129000	155000	206000	258000	310000
M22	1.50	333	166000	200000	266000	333000	400000
M22	2.00	318	159000	191000	254000	318000	382000
M24	2.00	384	192000	230000	307000	384000	460000
M27	2.00	496	248000	298000	397000	496000	595000
M30	2.00	621	310000	373000	497000	621000	745000
M33	2.00	761	380000	456000	608000	761000	914000
M36	3.00	865	432000	519000	692000	865000	1040000
M39	3.00	1030	501000	618000	825000	1030000	1240000

The above proof loads are also valid for nuts where the property class marking is enclosed by two vertical lines |8|
Conversion Factor: 1N = 0.2248 lb.

*All information is strictly informative

Proof Loads for Fasteners

Proof Loads For ScrewsISO Metric (Coarse) Threads ISO 898/I-1988

Proof Loads For ScrewsISO Metric (Fine) Threads ISO 898/I-1988

Proof Loads For Nuts (Coarse Thread)According to DIN 934 and DIN 985 (Ref. DIN 267/4)

Proof Loads For Nuts (Fine Thread)According to DIN 934 and DIN 985 (Ref. DIN 267/4)

Proof Loads For Screws
ISO Metric (Coarse) Threads ISO 898/I-1988

Proof Loads For Screws
ISO Metric (Fine) Threads ISO 898/I-1988

Proof Loads For Nuts (Coarse Thread)
According to DIN 934 and DIN 985 (Ref. DIN 267/4)

Proof Loads For Nuts (Fine Thread)
According to DIN 934 and DIN 985 (Ref. DIN 267/4)