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Stopper Bolts - Shoulder Type, Economy series (EA-USRT5-45)

Volume Discount

MISUMI

MiSUMi Economy

MISUMI

Only part numbers that can be generated via the filter(Configurator bar on the left) are currently available.

Part Number

Configured Part Number is shown.

EA-USRT5-45

Drawing/Specifications
Part Numbers

[ ! ] Please note that some sizes listed in the specification table are not yet available.
Part numbers generated using the configuration bar on the left side of the page are valid.

Dimensional Drawing

Standard Straight Hex Socket Straight Standard Type, SR Hex Socket Type, SR [ ! ]Incomplete threaded portion of 2 x pitch is under the neck.

M (Coarse)	D	B	(C)	H	h	t	t₁	m	(ℓ)	B₁	SR
3	3.5	5.5	6.4	2	0.7	1.5	2	1.8	-	-	3.5
4	5	7	8.1	2.8	1.5		2.2	2.4	2.2	2	5
5	6	8	9.2	3.5	1.5		2.3	3.2	2.8	2.5	6
6	8	10	11.5	4	2	2	2.6	3.6	3	3	8
8	10	13	15	5.5			2.8	5	4	4	10
10	13	17	19.6	7			3.2	6	5	5	13
12	15	19	21.9	8			3.5	7	-	-	15

Product Specifications

Standard

Hex Socket Type

Stopper

Screw

[A]Accessory (Hex nut)

Resin, rubber
How to mount

Straight
Shape

SR Shape

Straight
Shape

SR Shape

[M] Material

[ H ] Hardness

Operating temperature
(°C) reference value

[M] Material

Strength class

[S] Surface treatment

[M] Material

[S] Surface treatment

UST

USRT

USTH

USRTH

Urethane (Black)

Shore A90

-20 to 70

SCM435*²

10.9

Trivalent Chromate

SS400

Trivalent Chromate

Fused
(Thermosetting bonded)

SUST

SUSRT

SUSTH

SUSRTH

SUS304

—

SUS304 Equivalent

—

LUST

—

Low Repulsion Urethane (Gray)

Shore A70

-20 to 70

SCM435

10.9

Bright chromate plating*³

SS400

Trivalent Chromate

Fused
(Thermosetting bonded)

PUST

—

PUSTH

—

Polyacetal
(white)

—

70 or less*¹

SCM435

10.9

Trivalent Chromate

SS400

Trivalent Chromate

Bonded
(Ambient temperature bonded)

PSST

—

PSSTH

—

SUS304

—

SUS304 Equivalent

—

USTS

—

Silicon
(light gray)

Shore A70

70 or less*¹

SCM435

10.9

Trivalent Chromate

SS400

Trivalent Chromate

Fused
(Thermosetting bonded)

SSTS

—

SUS304

—

SUS304 Equivalent

—

*1 The operating temperature is a reference value.
The operating temperature of polyacetal/silicon is affected by the adhesive.
*2 Type: USTH uses SCM435 equivalent material. Please check the product specifications and dimensions when selecting a product.
*3 Bright chromate plating for LUST is being switched to trivalent chromate.
[ ! ] Only the urethane stopper part at the tip is not sold. (Standard products are not available)

Part Number Display Method

Part Number	-	L
UST8	-	40

Specification Table

Part Number					L Selection
Type				M (Coarse)	L Selection
Standard		Hex Socket Type		3	15	20	25	30	35	40
(Standard)	(SR)	(Hex Socket)	(SR)	4	15	20	25	30	35	40
UST	USRT	USTH	USRTH
SUST	SUSRT	SUSTH	SUSRTH
LUST				5	15	20	25	30	35	40	45	50
PUST		PUSTH		6		20	25	30	35	40	45	50	60
PSST		PSSTH		8		20	25	30	35	40	45	50	60
USTS				10		20	25	30	35	40	45	50	60	70
SSTS				12				30		40		50	60	70

[ ! ] It is up to SR shape M10.

Selection Supporting Information

Mass (g)	Part Number
Reference values	Part Number
M	L	UST	SUST	LUST	PUST	USRT	SUSRT	PSST	USTS	SSTS	USTH	SUSTH	PUSTH	PSSTH	SUSRTH	USRTH
3	15	1	1	1	1	1	1	1	—	—	—	—	—	—	—	—
	20	1	2	1	2	1	1	1	—	—	—	—	—	—	—	—
	25	2	1	2	2	2	2	2	—	—	—	—	—	—	—	—
	30	1	1	1	2	2	2	2	—	—	—	—	—	—	—	—
	35	1	2	2	2	2	2	2	—	—	—	—	—	—	—	—
	40	2	2	2	2	2	2	2	—	—	—	—	—	—	—	—
4	15	2	2	2	2	2	3	2	2	2	2	2	2	2	2	2
	20	3	3	3	3	3	3	3	2	3	2	2	2	2	2	2
	25	3	3	3	3	3	3	3	3	3	3	3	4	3	3	3
	30	4	4	3	3	3	3	3	3	3	3	4	4	3	3	3
	35	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4
	40	4	4	4	4	4	4	5	4	4	4	4	4	4	4	4
5	15	4	4	4	4	4	4	4	4	4	3	4	3	4	4	4
	20	4	4	4	4	5	4	4	4	4	4	4	4	4	4	4
	25	5	5	5	5	5	5	5	5	5	5	5	5	4	5	5
	30	6	5	6	5	6	5	5	6	6	5	5	5	5	5	5
	35	6	6	6	6	6	7	6	6	6	6	6	6	6	6	6
	40	7	7	7	7	7	7	7	7	15	7	7	7	6	7	7
	45	7	7	7	8	7	7	7	7	7	7	7	7	7	8	8
	50	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8
6	20	7	7	7	7	7	7	7	7	7	6	6	6	7	7	7
	25	8	8	8	8	8	8	7	8	8	7	7	7	7	7	7
	30	9	9	8	9	8	9	8	9	8	8	8	9	8	2	8
	35	10	10	9	9	10	9	9	9	9	9	9	9	9	9	9
	40	10	10	10	9	11	10	10	11	11	10	10	10	10	10	10
	45	11	11	11	11	11	11	10	11	11	11	11	10	11	11	11
	50	12	12	12	12	12	12	12	12	12	12	12	11	12	12	12
	60	14	14	14	14	14	14	13	14	13	15	14	13	14	13	13
8	20	15	15	15	16	15	15	15	15	15	14	14	14	14	14	14
	25	16	17	16	16	17	17	16	16	16	16	16	15	15	16	16
	30	18	18	18	18	18	18	18	18	18	17	17	17	17	17	17
	35	19	19	19	20	19	20	20	19	19	19	19	18	19	19	19
	40	21	21	21	21	21	21	21	21	21	20	20	20	20	20	20
	45	22	22	22	22	22	23	23	23	23	22	22	22	22	22	21
	50	24	24	24	24	24	25	24	24	25	24	24	23	23	24	24
	60	27	27	27	27	28	28	27	27	27	27	27	27	27	27	27
10	20	29	29	29	29	29	29	28	—	—	28	28	28	27	27	27
	25	32	31	31	32	32	31	31	—	—	30	30	30	30	30	30
	30	34	34	34	34	34	34	33	—	—	33	33	32	32	32	33
	35	36	36	36	36	37	36	35	—	—	35	34	35	35	35	35
	40	39	39	39	39	39	39	38	—	—	37	37	36	37	38	37
	45	41	42	41	42	42	41	41	—	—	40	40	40	39	40	40
	50	44	44	43	44	44	44	44	—	—	43	42	42	42	42	43
	60	49	49	48	48	49	49	48	—	—	47	47	47	46	46	47
	70	54	54	53	53	54	54	53	—	—	53	52	53	52	52	52
12	30	48	49	48	48	49	48	48	—	—	—	—	—	—	—	—
	40	56	55	55	55	56	56	55	—	—	—	—	—	—	—	—
	50	77	63	62	62	63	63	63	—	—	—	—	—	—	—	—
	60	70	70	70	70	70	70	69	—	—	—	—	—	—	—	—
	70	77	38	76	22	77	77	77	—	—	—	—	—	—	—	—

Cautions/prohibitions

Tightening shaft force and fatigue limit when fastening with bolts

Calculation of the appropriate tightening axial force when tightening bolts should be within the elastic range of up to 70% of the specified capacity for the torque method.
The fatigue strength of the bolt due to repeated loading should not be over the allowable value.
The objects tightened should not be caved in on the bolt and nut seating surfaces.
The objects tightened should not be damaged due to tightening.

The torque method, torque gradient method, angle of rotation method, and elongation measurement method are available as bolt tightening methods, but the torque method is widely used because it is simple and easy to use.

Technical information

Bolt strength

1) When bolt is subjected to tensile load

Pt = σt × As:: (1)
= πd² σt/4: (2)

Pt: Axial direction tensile load [N]
σb: Yield stress of bolts [N/mm²]
σt: Allowable stress of bolts [N/mm²]
(σt = σb/safety factor α)
As: Effective sectional area of bolts [mm²]
As = πd²/4
d: Effective diameter of bolts (root diameter)[m]

(Example) Find the appropriate size for a single hex socket head cap screw to repeatedly (pulsating) receive a tensile load of P = 1,960 N {200 kgf}. (The hex socket head cap screw is made of EN 1.7220 Equiv., 38 to 43HRC, and has a strength class of 12.9.)

(1) From equation
As = Pt/σt = 1,960/219.6 = 8.9 [mm²]
∴It is recommended to find an effective sectional area larger than this from the "Bolt Fatigue Strength" table below and select M5 of 14.2 [mm²].
In consideration of fatigue strength, select M6 with an allowable load of 2,087 N {213 kgf} from strength class 12.9 in the table.

2) When receiving tensile impact loads, such as stripper bolts, select based on fatigue strength. (Similarly, the stripper bolt that receives a load of 1,960 N {200 kgf} is made of EN 1.7220 Equiv., 33 to 38 HRC, and has a strength class of 10.9.)

According to the table "Fatigue Strength of Bolts" below, when the allowable load for strength class 10.9 is 1,960 N {200 kgf} or more, the M8 is 3,116 [N] {318 [kgf]}. Therefore, MSB10 with a shaft dia. of 10 mm with an M8 threaded section is selected. When the bolt is subjected to shear load, use a dowel pin in combination.

■ Unwin safety factor α based on tensile strength

Material	Static load	Repeated load		Impact load
Material	Static load	Pulsating	Alternating	Impact load
Steel	3	5	8	12
Cast iron	4	6	10	15
Copper, soft metals	5	5	9	15

Allowable stress = standard strength / safety factor α
Standard strength: Yield stress for ductile materials (fracture stress for brittle materials)

The yield stress of strength class 12.9 is σb = 1,098 [N/mm²] {112 [kgf/mm²] }
Allowable stress σt = σb/safety factor (safety factor 5 from the above table "Unwin Safety Factor α Based on Tensile Strength")
=1098/5
= 219.6 [N/mm²] {22.4 [kgf/mm²] }

■Bolt fatigue strength (for screws >> fatigue strength of 2 million cycles)

Nominal of thread	Effective sectional area As mm²	Strength class
		12.9		10.9
		Fatigue strength *	12.9	10.9	10.9
		N/mm² {kgf/mm²}	N {kgf}	N/mm² {kgf/mm²}	N {kgf}
M4	8.78	128 {13.1}	1117 {114}	89 {9.1}	774 {79}
M5	14.2	111 {11.3}	1568 {160}	76 {7.8}	1088 {111}
M6	20.1	104 {10.6}	2087 {213}	73 {7.4}	1460 {149}
M8	36.6	87 {8.9}	3195 {326}	85 {8.7}	3116 {318}
M10	58	73 {7.4}	4204 {429}	72 {7.3}	4145 {423}
M12	84.3	66 {6.7}	5537 {565}	64 {6.5}	5370 {548}
M14	115	60 {6.1}	6880 {702}	59 {6}	6762 {690}
M16	157	57 {5.8}	8928 {911}	56 {5.7}	8771 {895}
M20	245	51 {5.2}	12485 {1274}	50 {5.1}	12250 {1250}
M24	353	46 {4.7}	16258 {1659}	46 {4.7}	16258 {1659}

Fatigue strength* is extracted from "Estimated Fatigue Limits for Metric Threads for Machine Screws, Bolts, and Nuts" (Yamamoto) and revised.

: 30; 45; 60

Part Number
EA-USRT5-45

Part Number	Standard Unit Price	Minimum order quantity	Volume Discount	Days to Ship	Tip Shape	Stopper Shape	Stopper Material (Color)	Screw Material	Screw Dia. (Coarse) M	Length L Dimension (mm)
	MYR 7.20	1 Piece(s)	Available	20 Day(s)	Standard	SR Shape	Urethane (Black)	SCM435	5	45

Please check the type/dimensions/specifications of the part EA-USRT5-45 in the Stopper Bolts - Shoulder Type, Economy series series.

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Specification/Dimensions

type
- EA-LUST
- EA-PSST
- EA-PSSTH
- EA-PUST
- EA-PUSTH
- EA-SSTS
- EA-SUSRT
- EA-SUSRTH
- EA-SUST
- EA-SUSTH
- EA-USRT
- EA-USRTH
- EA-UST
- EA-USTH
- EA-USTS
Clear
Tip Shape
- Hex Socket
- Standard
Clear
Stopper Shape
- SR Shape
- Straight
Clear
Stopper Material (Color)
- Low Repulsion Urethane (Gray)
- Polyacetal (White)
- Silicon (Light Gray)
- Urethane (Black)
Clear
Screw Material
- SUS304
- SCM435
- SCM435 Equivalent
Clear
Screw Dia. (Coarse) M
- 3
- 4
- 5
- 6
- 8
- 10
- 12
Clear
Length L Dimension(mm)
15

20

25

30

35

40

45

50

60

70
Clear
CAD
- 2D
Clear

Days to Ship

All

6 Day(s) or Less

17 Day(s) or Less

20 Day(s) or Less

23 Day(s) or Less
Clear

Specify Alterations

The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .

Products like this...

Part Number
EA-LUST10-35
EA-LUST10-40
EA-LUST10-45
EA-USRT5-50
EA-USRT6-20
EA-USRT6-25

Standard Unit Price	Minimum order quantity	Volume Discount	Days to Ship	Tip Shape	Stopper Shape	Stopper Material (Color)	Screw Material	Screw Dia. (Coarse) M	Length L Dimension (mm)
MYR 12.01	1 Piece(s)	Available	20 Day(s)	Standard	Straight	Low Repulsion Urethane (Gray)	SCM435	10	35
MYR 12.01	1 Piece(s)	Available	20 Day(s)	Standard	Straight	Low Repulsion Urethane (Gray)	SCM435	10	40
MYR 12.01	1 Piece(s)	Available	20 Day(s)	Standard	Straight	Low Repulsion Urethane (Gray)	SCM435	10	45
MYR 7.20	1 Piece(s)	Available	20 Day(s)	Standard	SR Shape	Urethane (Black)	SCM435	5	50
MYR 7.20	1 Piece(s)	Available	20 Day(s)	Standard	SR Shape	Urethane (Black)	SCM435	6	20
MYR 7.20	1 Piece(s)	Available	20 Day(s)	Standard	SR Shape	Urethane (Black)	SCM435	6	25